2020 International Conference on Power, Instrumentation, Control and Computing (PICC)
The non conventional energy generation is a cleaner alternative of greener AC microgrid. This pap... more The non conventional energy generation is a cleaner alternative of greener AC microgrid. This paper presents the performance enhancement of a non conventional energy based microgrid for the seamless grid synchronization. A robust control strategy is used for wind energy conversion system (WECS) and battery energy storage (BES) based nonconventional energy system (NCES) with seamless changeover proficiency from an islanded (IL) mode to the grid-connected (GC) mode and grid reconnected (GR) mode. The NCES has a capability to feed the load both in GC and IL modes and it operates smoothly during mode shifting from IL to GC and GC to IL. The unknown disturbances and ambiguity of NCES in GC mode are taken care by multilayer harmonic decoupling network based quadrature fourth order complex filter (MHDN-QFOCF). The issues like fluctuation in power, DC offset, voltage unbalance, swell/sag produced by WECS, are successfully taken care by MHDN- QFOCF. . With the help of this algorithm, the l quadrature sinusoidal fundamental component (Q-SFC) is extracted. It improves overall system capability of power flow. To control the NCES in an IL mode, the proportional plus resonant (P+R) based control algorithm is used. A dual fourth order complex filter (DFOCF) is combining to phase locked loop (PLL) and develops DFOCF-PLL for precise and smooth synchronization and resynchronization of grid. DFOCF-PLL improves system performance without affecting the stability. During frequency variation, it effectively follows the voltages of the grid and the load and it is adjustable to different conditions of grid. Moreover, total harmonic distortions (THDs) of the load and grid parameters are in the limits of the IEEE-519 standard.
2020 IEEE International Conference on Power Electronics, Drives and Energy Systems (PEDES)
This work presents an adaptive control approach of solar Photovoltaic (PV) based nonconventional ... more This work presents an adaptive control approach of solar Photovoltaic (PV) based nonconventional energy system (NCES) with seamless changeover proficiency from an islanded mode (ILM) to grid-connected mode (GCM). The NCES has a capability to feed the load both in GCM and ILM and it operates smoothly during mode shifting from IL to GC and vice-versa. The unknown disruptions and uncertainties of NCES in GC mode are taken care by proportional plus multilayer modified third order sinusoidal signals integrator (P+M3rdOSSI) with multilayer harmonic decoupling network (MHDN). The concern like power fluctuations, DC offset, unbalance in voltage are successfully taken care by P+M3rdOSSI with MHDN. With the help of this algorithm, the sinusoidal quadrature fundamental component (SQFC) is extracted and reduces computational time. At the point of linkage (POL), the power quality gets improve with this control. It improves overall system performance as it operates adequately in steady state and transient conditions. To control the NCES in an ILM, the proportional plus resonant (P+R) based control algorithm is used. The steady state error gets reduced and system become robust with the help of $\mathrm{P}+\mathrm{R}$ based controller as compared to conventional PI control method, and hence zero steady-state error is achieve. A dual quadrature second order generalized integrator (DQSOGI) based PLL is used for precise and smooth synchronization and resynchronization of grid. DQSOGI based PLL improves system performance without affecting the stability. During frequency variation, it effectively follows the voltages of the grid and the load and it is adjustable to different conditions of grid. Moreover, total harmonic distortions (THDs) of the load and grid parameters are in the limits of the IEEE-519 standard.
2020 IEEE International Conference on Computing, Power and Communication Technologies (GUCON)
This paper deals with the dynamic and robust control strategy of a grid tied SPV (Solar Photovolt... more This paper deals with the dynamic and robust control strategy of a grid tied SPV (Solar Photovoltaic) based renewable energy system (RES) that ensures good performance of power flow. It also ensures proper injection of power into the grid. The multilayer third order sinusoidal signals integrator (MTOSSI) based control algorithm conquers the problem of poor grid conditions. This control is used for the extraction of fundamental component (FC) with reduced burden. This control provides sinusoidal FC with an ability of noise rejection and reduces error less than conventional third order sinusoidal signal integrator (TOSSI). It reduces computation time and improves the quadrature fundamental component (QFC) performance. Thus it improves the overall system capability of power flow. For managing the reactive power, AIDMSOGI-QSG-FLL based control algorithm is used. AIDMSOGI-QSG-FLL is used for calculation of positive sequence and negative sequence of fundamental components with the help of PNSC (Positive-Negative Signal Calculator). The source currents and the power quality are balanced and unaffected even under different unbalance conditions, which make the system robust and reliable. The total harmonic distortions of grid currents are observed within the IEEE-519 standard.
Samples with doping of Mn (0, 2, and 4%) in ZnFe2O4 were prepared by sol-gel chemical route at 80... more Samples with doping of Mn (0, 2, and 4%) in ZnFe2O4 were prepared by sol-gel chemical route at 80oC. X-ray powder diffraction and Raman spectrum analysis were used to determine the preliminary phase of obtained samples. W-H and SSP plots were used to determine the crystallite size and micro-strain of samples. Using zeta potential and scanning electron microscope, the surface charge and morphology of the prepared samples were studied. The optical bandgap of sample suggested that it was semiconducting. The dielectric characteristics of samples were examined as a function of temperature at various frequencies (1 KHz, 10 KHz, 100 KHz, and 1 MHz) (60-600oC). Dielectric study revealed the presence of interfacial and orientational polarization, with dielectric constants and dissipation factors ranging from (0.7–460) to (0.3–0.8), remain thermally stability up to 300oC. In samples ZF-0, ZF-2, and ZF-4, the thermal dependence of DC conductivity demonstrates Arrhenius transport with one, two,...
2021 International Conference on Sustainable Energy and Future Electric Transportation (SEFET), 2021
A three phase three wire based microgrid (MG) consisting of permanent magnet brushless DC generat... more A three phase three wire based microgrid (MG) consisting of permanent magnet brushless DC generator (PMBLDC) based wind energy conversion system (WECS) is demonstrated in this paper. This paper presents the performance enhancement of a non conventional energy system (NCE) based microgrid for the seamless grid synchronization. This paper presents dynamic controls for grid connected and islanded modes of operation. For grid connected mode (GCM), a quadrature third order generalized integrator and frequency locked loop and multilayer harmonic decoupling network (QTOGI-FLL-MHDN) based control algorithm is used. The problems like voltage imbalance, DC offset, swell/sag, fluctuation in power produced by WECS, are successfully taken care by QTOGI-FLL-MHDN. The quadrature component of load fundamental is extracted with QTOGI-FLL-MHDN. For standalone mode (SAM), a resonant and proportional resonant (R+PR) control is presented. For the synchronization technique to perfectly track the phase and frequency, a dual TOGI (DTOGI) is combining with the phase locked loop (PLL). This improves the system response under frequency deviation. During frequency variation, it effectively follows the voltages of the grid and the load and it is adjustable to different conditions of grid. Total harmonic distortions (THDs) of are in the boundaries of the IEEE-519 standard.
2021 IEEE 4th International Conference on Computing, Power and Communication Technologies (GUCON), 2021
A microgrid (MG) having a wind generator and solar photovoltaic (SPV) array, which functions seam... more A microgrid (MG) having a wind generator and solar photovoltaic (SPV) array, which functions seamlessly from standalone to grid connected mode. The microgrid has an ability to fulfill the demand of the loads in both the modes. A third order selective tuning filter (TOSTF) based control is used for grid connected mode. This control successfully controls active power flow and mitigates of harmonics. The control approach based on proportional resonant (PR) is used in astandalone mode. Moreover, a dual TOSTF with phase locked loop (PLL) is used for effortless synchronization of the grid. This improves the seamless mode switching by effectively estimating phase angles and frequency during grid voltages unbalance. The microgrid performance and robustness of controls are validated through test results.
2020 3rd International Conference on Energy, Power and Environment: Towards Clean Energy Technologies, 2021
The nonconventional energy sources based microgrid increases the reliability and sustainability o... more The nonconventional energy sources based microgrid increases the reliability and sustainability of supply. This work presents a system having a wind and solar Photovoltaic (PV) along with battery energy storage (BES) with seamless transition capability from grid connected (GC) to islanded (IL) and vice-versa. The disruptions and uncertainties of MG in grid connected mode are managed by a combined generalized complex filter (CGCF) based control. CGCF solves the issues like fluctuations, DC offset, imbalance in voltage, swell/sag produced by the system. To control the MG in an IL mode, the proportional resonant combine with resonant ($\text{PR}+\mathrm{R}$) based control algorithm is used. For synchronization of the grid, a dual CGCF (DCGCF) is cascaded with phase locked loop (PLL) is used. During various operating conditions, the performance of system is found satisfactory.
Journal of Materials Science: Materials in Electronics, 2020
The samples SrSnO 3 (SBS0) and Sr 0.98 Ba 0.02 SnO 3 (SBS2) were synthesized using sol-gel route,... more The samples SrSnO 3 (SBS0) and Sr 0.98 Ba 0.02 SnO 3 (SBS2) were synthesized using sol-gel route, followed by calcination at 1073 K. Rietveld refinement analysis of XRD data shows orthorhombic phase under Pbnm space group. Lattice parameters, volume and density of the doped sample were found to be higher than undoped, due to higher ionic radii of Ba 2+. Further, the Raman spectrum of samples was carried out to study the local structure. Optical properties of samples show intense absorption in UV range and transparent in visible to NIR region. The direct bandgap of samples was found to be 3.88 eV and 3.97 eV for SBS0 and SBS2, respectively, reflecting the semiconducting nature of a sample. Dielectric properties of the sample were explained in terms of interfacial and orientational polarization. Temperature-dependent conductivity analysis of the sample reflected an Arrhenius-type charge transport, with two conduction regions in SBS2 and single conduction in SBS0. In the present case, the activation energy value represents a mixed ionic and electronic conductivity of the sample, making it a promising candidate for mixed ionic and electronic conductor device application.
2020 21st National Power Systems Conference (NPSC), 2020
This paper presents a robust and comprehensive seventh order complex filter (7thOCF) based contro... more This paper presents a robust and comprehensive seventh order complex filter (7thOCF) based control for solar photovoltaic (SPV) based nonconventional energy system (NES) with seamless changeover proficiency from different modes i.e, from the grid connected (GC) to an islanded (IL) mode. In GC mode of NES operation, this conquers the problem of poor grid conditions. The NES has a capability to feed the load both in GC and IL modes and it operates smoothly during mode shifting between modes. The unknown disturbances of NES in grid connected mode are taken care by the 7thOCF. With the help of this algorithm, the quadrature sinusoidal fundamental component (Q-SFC) is extracted. For control of the NES in an islanded mode, a control algorithm is used which based on the resonant controller plus proportional resonant (R+PR) control. A dual seventh order complex filter (D7thOCF) is combining to phase locked loop (PLL) for smooth synchronization and resynchronization to the grid. Without affecting the stability, it improves performance of the system. Simulated results are presented to demonstrate the performance of the NES and validate the robustness and effectiveness of control schemes. Moreover, total harmonic distortions (THDs) of the load and grid parameters are in the limits of the IEEE-519 standard.
A three-phase four-wire microgrid comprising of a solar photovoltaic (PV) array—battery energy st... more A three-phase four-wire microgrid comprising of a solar photovoltaic (PV) array—battery energy storage—a diesel engine generator set (DEGS) is presented in this article. Here an enhanced adaptive filter (EAF) control and an incremental conductance (INC) maximum power point tracking algorithm are used to improve the power quality and to extract the maximum power from the PV array. The EAF control provides higher disturbance rejection capability over other controls. The EAF control is applied to the voltage source converter (VSC) to improve the power quality, such as compensation of harmonics, reactive power, and load unbalance. The INC control is used to harvest the PV array maximum power. For controlling the voltage output of the DEGS, an electronic automatic voltage regulator is provided at the synchronous generator field winding. The neutral current compensation is achieved by controlling the fourth-leg of VSC. This microgrid is simulated using MATLAB/Simulink tool. The robustness of the EAF control strategy is tested on a developed system prototype in the laboratory.
Exploring the cost-effective alternative materials to replace the synthetic dyes for application ... more Exploring the cost-effective alternative materials to replace the synthetic dyes for application in dye sensitized solar cells (DSSC) could help in reducing the overall cost of the devices. Herein, we investigate two cost-effective textile dyes, namely hot reactive dye and vat dye for application in the DSSC. Morphology, domain size, and crystalline phase of the TiO 2 nanoparticles in dye loaded TiO 2 films are examined in detail by FESEM and X-ray diffraction measurements. Modifications in the absorption spectra of dyes upon adsorption into TiO 2 are investigated by UV-Vis analysis. Fourier transform infrared spectroscopy analysis allows us to identify the various functional groups present in the dyes. By comparing the photovoltaic performance, we found that hot reactive dye based DSSC yield power conversion efficiency (PCE) of 1.20%, which is significantly higher than the vat dye based DSSC (0.51%). This is mainly due to superior short-circuit current density (J sc) and open circuit voltage generated in the hot reactive dye relative to the vat dye based DSSC. The higher J sc in the hot reactive dye-based device is mainly attributed to the favorable morphology, better crystallinity and superior absorption features of hot reactive dye coated TiO 2 film. However, a slightly less fill factor is noticed for hot reactive dyebased devices owing to the lesser shunt resistance in comparison to the vat dye-based device. Although the PCE attained by these devices is far below that of standard DSSC, the present study can be helpful in the development of more eco-friendly and cost-effective solar cells.
This work investigates active layer thickness dependence of the morphology, crystallinity and opt... more This work investigates active layer thickness dependence of the morphology, crystallinity and optoelectronic performance of CH 3 NH 3 PbI 3 perovskite-based planar heterojunction photodiodes (PDs). Surface morphology, average grain size, and crystalline size were monotonically improved with increasing the perovskite film thickness. However, the device performance was dramatically affected by enlarging the perovskite film thickness. Increasing the perovskite film thickness from 300 nm to 450 nm initially raised the device performance from (detectivity (D): 8.13 x 10 10 Jones) to (D: 1.42 x 10 12 Jones), as a result of the reduced recombination losses and improved charge transport properties due to the superior surface morphology, larger grain size and improved crystallinity. Nevertheless, the performance drops again (D: 2.0x10 11 Jones) when the thickness was increased to 600 nm, which can be attributed to reduced absorbance, increased charge recombination and the reduced collection efficiency. An unexpected reduction in absorbance and exceptionally poor charge collection efficiency can be possibly related to the remnant excess PbI 2 , as inferred from x-ray diffraction analysis.
This paper reports the fabrication and characterization of bulk heterojunction inverted structure... more This paper reports the fabrication and characterization of bulk heterojunction inverted structured organic solar cell devices (OSC) with the architecture of ITO/ZnO/PTB7:PC 70 BM/MoO3/Ag. The photovoltaic properties of OSC were examined through the analysis of various photovoltaic parameters, which includes the external quantum efficiency, short circuit current density (J sc), and open circuit voltage (V oc). The inverted structured OSC device showed the efficiency of 5.87 %. The achieved efficiency can be attributed to the better light harvesting capability, improved interfacial properties and improved charge collection efficiency. The AC impedance technique was employed to extract internal parameters of the fabricated devices. The obtained impedance curves evidently exhibit high-quality correlation between the obtained data and the curve fitting data.
Herein, this work scrutinises the charge transport properties of solution-processed methylammoniu... more Herein, this work scrutinises the charge transport properties of solution-processed methylammonium lead iodide (MAPbI3) perovskite-based hole only device through the DC current–voltage and AC impedance spectroscopy analysis. The device shows a significant increase in the current levels under illumination. Key diode parameters were estimated from the dark I–V curves. The dominance of Ohm's law at low bias, space charge limited conduction (SCLC) followed trap controlled SCLC at higher applied bias was observed from charge transport analysis. From the region dominated by the trap free SCLC, the hole mobility of 4.02 × 10−6 cm2V−1s−1 inside the perovskite layer was extracted. The measured impedance spectrum was analysed by fitting it with the equivalent circuit model, and the various physical parameters, such as charge transport resistance, recombination resistance and associated capacitance were approximated for the device.
2016 International Conference on Emerging Trends in Communication Technologies (ETCT), 2016
This paper presents control strategies of voltage and frequency controller (VFC's) for an iso... more This paper presents control strategies of voltage and frequency controller (VFC's) for an isolated asynchronous generator for wind energy system. Magnitude of voltage and frequency changes because of changing load and because of wind speed variation. The main confront in operation of isolated asynchronous generators are to provide unobstructed electricity with synchronized frequency and voltage under variation in consumer load and wind speeds. The capability of VFCs are established to authenticate its operation as a neutral current compensator, phase balancer, load balancer and an active filter with a VFC. Therefore, different control strategies with an improved voltage and frequency controller together with an energy storage system is used to make voltage constant and frequency constant at different load and different wind speed. It has been observed that control strategy with estimation has surpassed the performance of control strategy without estimation in terms of less requirement of current sensors.
2020 International Conference on Power, Instrumentation, Control and Computing (PICC)
The non conventional energy generation is a cleaner alternative of greener AC microgrid. This pap... more The non conventional energy generation is a cleaner alternative of greener AC microgrid. This paper presents the performance enhancement of a non conventional energy based microgrid for the seamless grid synchronization. A robust control strategy is used for wind energy conversion system (WECS) and battery energy storage (BES) based nonconventional energy system (NCES) with seamless changeover proficiency from an islanded (IL) mode to the grid-connected (GC) mode and grid reconnected (GR) mode. The NCES has a capability to feed the load both in GC and IL modes and it operates smoothly during mode shifting from IL to GC and GC to IL. The unknown disturbances and ambiguity of NCES in GC mode are taken care by multilayer harmonic decoupling network based quadrature fourth order complex filter (MHDN-QFOCF). The issues like fluctuation in power, DC offset, voltage unbalance, swell/sag produced by WECS, are successfully taken care by MHDN- QFOCF. . With the help of this algorithm, the l quadrature sinusoidal fundamental component (Q-SFC) is extracted. It improves overall system capability of power flow. To control the NCES in an IL mode, the proportional plus resonant (P+R) based control algorithm is used. A dual fourth order complex filter (DFOCF) is combining to phase locked loop (PLL) and develops DFOCF-PLL for precise and smooth synchronization and resynchronization of grid. DFOCF-PLL improves system performance without affecting the stability. During frequency variation, it effectively follows the voltages of the grid and the load and it is adjustable to different conditions of grid. Moreover, total harmonic distortions (THDs) of the load and grid parameters are in the limits of the IEEE-519 standard.
2020 IEEE International Conference on Power Electronics, Drives and Energy Systems (PEDES)
This work presents an adaptive control approach of solar Photovoltaic (PV) based nonconventional ... more This work presents an adaptive control approach of solar Photovoltaic (PV) based nonconventional energy system (NCES) with seamless changeover proficiency from an islanded mode (ILM) to grid-connected mode (GCM). The NCES has a capability to feed the load both in GCM and ILM and it operates smoothly during mode shifting from IL to GC and vice-versa. The unknown disruptions and uncertainties of NCES in GC mode are taken care by proportional plus multilayer modified third order sinusoidal signals integrator (P+M3rdOSSI) with multilayer harmonic decoupling network (MHDN). The concern like power fluctuations, DC offset, unbalance in voltage are successfully taken care by P+M3rdOSSI with MHDN. With the help of this algorithm, the sinusoidal quadrature fundamental component (SQFC) is extracted and reduces computational time. At the point of linkage (POL), the power quality gets improve with this control. It improves overall system performance as it operates adequately in steady state and transient conditions. To control the NCES in an ILM, the proportional plus resonant (P+R) based control algorithm is used. The steady state error gets reduced and system become robust with the help of $\mathrm{P}+\mathrm{R}$ based controller as compared to conventional PI control method, and hence zero steady-state error is achieve. A dual quadrature second order generalized integrator (DQSOGI) based PLL is used for precise and smooth synchronization and resynchronization of grid. DQSOGI based PLL improves system performance without affecting the stability. During frequency variation, it effectively follows the voltages of the grid and the load and it is adjustable to different conditions of grid. Moreover, total harmonic distortions (THDs) of the load and grid parameters are in the limits of the IEEE-519 standard.
2020 IEEE International Conference on Computing, Power and Communication Technologies (GUCON)
This paper deals with the dynamic and robust control strategy of a grid tied SPV (Solar Photovolt... more This paper deals with the dynamic and robust control strategy of a grid tied SPV (Solar Photovoltaic) based renewable energy system (RES) that ensures good performance of power flow. It also ensures proper injection of power into the grid. The multilayer third order sinusoidal signals integrator (MTOSSI) based control algorithm conquers the problem of poor grid conditions. This control is used for the extraction of fundamental component (FC) with reduced burden. This control provides sinusoidal FC with an ability of noise rejection and reduces error less than conventional third order sinusoidal signal integrator (TOSSI). It reduces computation time and improves the quadrature fundamental component (QFC) performance. Thus it improves the overall system capability of power flow. For managing the reactive power, AIDMSOGI-QSG-FLL based control algorithm is used. AIDMSOGI-QSG-FLL is used for calculation of positive sequence and negative sequence of fundamental components with the help of PNSC (Positive-Negative Signal Calculator). The source currents and the power quality are balanced and unaffected even under different unbalance conditions, which make the system robust and reliable. The total harmonic distortions of grid currents are observed within the IEEE-519 standard.
Samples with doping of Mn (0, 2, and 4%) in ZnFe2O4 were prepared by sol-gel chemical route at 80... more Samples with doping of Mn (0, 2, and 4%) in ZnFe2O4 were prepared by sol-gel chemical route at 80oC. X-ray powder diffraction and Raman spectrum analysis were used to determine the preliminary phase of obtained samples. W-H and SSP plots were used to determine the crystallite size and micro-strain of samples. Using zeta potential and scanning electron microscope, the surface charge and morphology of the prepared samples were studied. The optical bandgap of sample suggested that it was semiconducting. The dielectric characteristics of samples were examined as a function of temperature at various frequencies (1 KHz, 10 KHz, 100 KHz, and 1 MHz) (60-600oC). Dielectric study revealed the presence of interfacial and orientational polarization, with dielectric constants and dissipation factors ranging from (0.7–460) to (0.3–0.8), remain thermally stability up to 300oC. In samples ZF-0, ZF-2, and ZF-4, the thermal dependence of DC conductivity demonstrates Arrhenius transport with one, two,...
2021 International Conference on Sustainable Energy and Future Electric Transportation (SEFET), 2021
A three phase three wire based microgrid (MG) consisting of permanent magnet brushless DC generat... more A three phase three wire based microgrid (MG) consisting of permanent magnet brushless DC generator (PMBLDC) based wind energy conversion system (WECS) is demonstrated in this paper. This paper presents the performance enhancement of a non conventional energy system (NCE) based microgrid for the seamless grid synchronization. This paper presents dynamic controls for grid connected and islanded modes of operation. For grid connected mode (GCM), a quadrature third order generalized integrator and frequency locked loop and multilayer harmonic decoupling network (QTOGI-FLL-MHDN) based control algorithm is used. The problems like voltage imbalance, DC offset, swell/sag, fluctuation in power produced by WECS, are successfully taken care by QTOGI-FLL-MHDN. The quadrature component of load fundamental is extracted with QTOGI-FLL-MHDN. For standalone mode (SAM), a resonant and proportional resonant (R+PR) control is presented. For the synchronization technique to perfectly track the phase and frequency, a dual TOGI (DTOGI) is combining with the phase locked loop (PLL). This improves the system response under frequency deviation. During frequency variation, it effectively follows the voltages of the grid and the load and it is adjustable to different conditions of grid. Total harmonic distortions (THDs) of are in the boundaries of the IEEE-519 standard.
2021 IEEE 4th International Conference on Computing, Power and Communication Technologies (GUCON), 2021
A microgrid (MG) having a wind generator and solar photovoltaic (SPV) array, which functions seam... more A microgrid (MG) having a wind generator and solar photovoltaic (SPV) array, which functions seamlessly from standalone to grid connected mode. The microgrid has an ability to fulfill the demand of the loads in both the modes. A third order selective tuning filter (TOSTF) based control is used for grid connected mode. This control successfully controls active power flow and mitigates of harmonics. The control approach based on proportional resonant (PR) is used in astandalone mode. Moreover, a dual TOSTF with phase locked loop (PLL) is used for effortless synchronization of the grid. This improves the seamless mode switching by effectively estimating phase angles and frequency during grid voltages unbalance. The microgrid performance and robustness of controls are validated through test results.
2020 3rd International Conference on Energy, Power and Environment: Towards Clean Energy Technologies, 2021
The nonconventional energy sources based microgrid increases the reliability and sustainability o... more The nonconventional energy sources based microgrid increases the reliability and sustainability of supply. This work presents a system having a wind and solar Photovoltaic (PV) along with battery energy storage (BES) with seamless transition capability from grid connected (GC) to islanded (IL) and vice-versa. The disruptions and uncertainties of MG in grid connected mode are managed by a combined generalized complex filter (CGCF) based control. CGCF solves the issues like fluctuations, DC offset, imbalance in voltage, swell/sag produced by the system. To control the MG in an IL mode, the proportional resonant combine with resonant ($\text{PR}+\mathrm{R}$) based control algorithm is used. For synchronization of the grid, a dual CGCF (DCGCF) is cascaded with phase locked loop (PLL) is used. During various operating conditions, the performance of system is found satisfactory.
Journal of Materials Science: Materials in Electronics, 2020
The samples SrSnO 3 (SBS0) and Sr 0.98 Ba 0.02 SnO 3 (SBS2) were synthesized using sol-gel route,... more The samples SrSnO 3 (SBS0) and Sr 0.98 Ba 0.02 SnO 3 (SBS2) were synthesized using sol-gel route, followed by calcination at 1073 K. Rietveld refinement analysis of XRD data shows orthorhombic phase under Pbnm space group. Lattice parameters, volume and density of the doped sample were found to be higher than undoped, due to higher ionic radii of Ba 2+. Further, the Raman spectrum of samples was carried out to study the local structure. Optical properties of samples show intense absorption in UV range and transparent in visible to NIR region. The direct bandgap of samples was found to be 3.88 eV and 3.97 eV for SBS0 and SBS2, respectively, reflecting the semiconducting nature of a sample. Dielectric properties of the sample were explained in terms of interfacial and orientational polarization. Temperature-dependent conductivity analysis of the sample reflected an Arrhenius-type charge transport, with two conduction regions in SBS2 and single conduction in SBS0. In the present case, the activation energy value represents a mixed ionic and electronic conductivity of the sample, making it a promising candidate for mixed ionic and electronic conductor device application.
2020 21st National Power Systems Conference (NPSC), 2020
This paper presents a robust and comprehensive seventh order complex filter (7thOCF) based contro... more This paper presents a robust and comprehensive seventh order complex filter (7thOCF) based control for solar photovoltaic (SPV) based nonconventional energy system (NES) with seamless changeover proficiency from different modes i.e, from the grid connected (GC) to an islanded (IL) mode. In GC mode of NES operation, this conquers the problem of poor grid conditions. The NES has a capability to feed the load both in GC and IL modes and it operates smoothly during mode shifting between modes. The unknown disturbances of NES in grid connected mode are taken care by the 7thOCF. With the help of this algorithm, the quadrature sinusoidal fundamental component (Q-SFC) is extracted. For control of the NES in an islanded mode, a control algorithm is used which based on the resonant controller plus proportional resonant (R+PR) control. A dual seventh order complex filter (D7thOCF) is combining to phase locked loop (PLL) for smooth synchronization and resynchronization to the grid. Without affecting the stability, it improves performance of the system. Simulated results are presented to demonstrate the performance of the NES and validate the robustness and effectiveness of control schemes. Moreover, total harmonic distortions (THDs) of the load and grid parameters are in the limits of the IEEE-519 standard.
A three-phase four-wire microgrid comprising of a solar photovoltaic (PV) array—battery energy st... more A three-phase four-wire microgrid comprising of a solar photovoltaic (PV) array—battery energy storage—a diesel engine generator set (DEGS) is presented in this article. Here an enhanced adaptive filter (EAF) control and an incremental conductance (INC) maximum power point tracking algorithm are used to improve the power quality and to extract the maximum power from the PV array. The EAF control provides higher disturbance rejection capability over other controls. The EAF control is applied to the voltage source converter (VSC) to improve the power quality, such as compensation of harmonics, reactive power, and load unbalance. The INC control is used to harvest the PV array maximum power. For controlling the voltage output of the DEGS, an electronic automatic voltage regulator is provided at the synchronous generator field winding. The neutral current compensation is achieved by controlling the fourth-leg of VSC. This microgrid is simulated using MATLAB/Simulink tool. The robustness of the EAF control strategy is tested on a developed system prototype in the laboratory.
Exploring the cost-effective alternative materials to replace the synthetic dyes for application ... more Exploring the cost-effective alternative materials to replace the synthetic dyes for application in dye sensitized solar cells (DSSC) could help in reducing the overall cost of the devices. Herein, we investigate two cost-effective textile dyes, namely hot reactive dye and vat dye for application in the DSSC. Morphology, domain size, and crystalline phase of the TiO 2 nanoparticles in dye loaded TiO 2 films are examined in detail by FESEM and X-ray diffraction measurements. Modifications in the absorption spectra of dyes upon adsorption into TiO 2 are investigated by UV-Vis analysis. Fourier transform infrared spectroscopy analysis allows us to identify the various functional groups present in the dyes. By comparing the photovoltaic performance, we found that hot reactive dye based DSSC yield power conversion efficiency (PCE) of 1.20%, which is significantly higher than the vat dye based DSSC (0.51%). This is mainly due to superior short-circuit current density (J sc) and open circuit voltage generated in the hot reactive dye relative to the vat dye based DSSC. The higher J sc in the hot reactive dye-based device is mainly attributed to the favorable morphology, better crystallinity and superior absorption features of hot reactive dye coated TiO 2 film. However, a slightly less fill factor is noticed for hot reactive dyebased devices owing to the lesser shunt resistance in comparison to the vat dye-based device. Although the PCE attained by these devices is far below that of standard DSSC, the present study can be helpful in the development of more eco-friendly and cost-effective solar cells.
This work investigates active layer thickness dependence of the morphology, crystallinity and opt... more This work investigates active layer thickness dependence of the morphology, crystallinity and optoelectronic performance of CH 3 NH 3 PbI 3 perovskite-based planar heterojunction photodiodes (PDs). Surface morphology, average grain size, and crystalline size were monotonically improved with increasing the perovskite film thickness. However, the device performance was dramatically affected by enlarging the perovskite film thickness. Increasing the perovskite film thickness from 300 nm to 450 nm initially raised the device performance from (detectivity (D): 8.13 x 10 10 Jones) to (D: 1.42 x 10 12 Jones), as a result of the reduced recombination losses and improved charge transport properties due to the superior surface morphology, larger grain size and improved crystallinity. Nevertheless, the performance drops again (D: 2.0x10 11 Jones) when the thickness was increased to 600 nm, which can be attributed to reduced absorbance, increased charge recombination and the reduced collection efficiency. An unexpected reduction in absorbance and exceptionally poor charge collection efficiency can be possibly related to the remnant excess PbI 2 , as inferred from x-ray diffraction analysis.
This paper reports the fabrication and characterization of bulk heterojunction inverted structure... more This paper reports the fabrication and characterization of bulk heterojunction inverted structured organic solar cell devices (OSC) with the architecture of ITO/ZnO/PTB7:PC 70 BM/MoO3/Ag. The photovoltaic properties of OSC were examined through the analysis of various photovoltaic parameters, which includes the external quantum efficiency, short circuit current density (J sc), and open circuit voltage (V oc). The inverted structured OSC device showed the efficiency of 5.87 %. The achieved efficiency can be attributed to the better light harvesting capability, improved interfacial properties and improved charge collection efficiency. The AC impedance technique was employed to extract internal parameters of the fabricated devices. The obtained impedance curves evidently exhibit high-quality correlation between the obtained data and the curve fitting data.
Herein, this work scrutinises the charge transport properties of solution-processed methylammoniu... more Herein, this work scrutinises the charge transport properties of solution-processed methylammonium lead iodide (MAPbI3) perovskite-based hole only device through the DC current–voltage and AC impedance spectroscopy analysis. The device shows a significant increase in the current levels under illumination. Key diode parameters were estimated from the dark I–V curves. The dominance of Ohm's law at low bias, space charge limited conduction (SCLC) followed trap controlled SCLC at higher applied bias was observed from charge transport analysis. From the region dominated by the trap free SCLC, the hole mobility of 4.02 × 10−6 cm2V−1s−1 inside the perovskite layer was extracted. The measured impedance spectrum was analysed by fitting it with the equivalent circuit model, and the various physical parameters, such as charge transport resistance, recombination resistance and associated capacitance were approximated for the device.
2016 International Conference on Emerging Trends in Communication Technologies (ETCT), 2016
This paper presents control strategies of voltage and frequency controller (VFC's) for an iso... more This paper presents control strategies of voltage and frequency controller (VFC's) for an isolated asynchronous generator for wind energy system. Magnitude of voltage and frequency changes because of changing load and because of wind speed variation. The main confront in operation of isolated asynchronous generators are to provide unobstructed electricity with synchronized frequency and voltage under variation in consumer load and wind speeds. The capability of VFCs are established to authenticate its operation as a neutral current compensator, phase balancer, load balancer and an active filter with a VFC. Therefore, different control strategies with an improved voltage and frequency controller together with an energy storage system is used to make voltage constant and frequency constant at different load and different wind speed. It has been observed that control strategy with estimation has surpassed the performance of control strategy without estimation in terms of less requirement of current sensors.
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Papers by Varsha Yadav