Papers by Koritala Chandra Sekhar
i-manager's Journal on Power Systems Engineering, 2017
International Journal of Power Electronics and Drive Systems (IJPEDS), 2022
Switched-inductor quasi-impedance source inverter (SL-qZSI) with high gain fed five-phase inducti... more Switched-inductor quasi-impedance source inverter (SL-qZSI) with high gain fed five-phase induction motor drive for electric vehicle (EV) applications is proposed in this paper. Multi-phase electric machines have been predicted for application where the entire system should have better reliability and demanded power per phase is low especially for autonomous applications like EVs. To supply variable voltage and frequency to multi-phase machines, multi-phase inverters are required. SL-qZSI offers enhanced boost capability with respect to traditional impedance source converters by inserting three diodes and only one inductor to the basic quasi-impedance source inverter (qZSI). Also, SL-qZSI offers withstanding capability during voltage dip results line harmonics are diminished; enhances reliability of inverter; and extended output voltage range. The key idea of this paper is to design and develop a high performance and highly reliable SL-qZSI fed five-phase Induction Motor drive and v...
In this paper a distributed static compensator (DSTATCOM) is proposed to compensate the reactive ... more In this paper a distributed static compensator (DSTATCOM) is proposed to compensate the reactive power and eliminates harmonics drawn from nonlinear load. The DSTATCOM control scheme is based on adaptive neuro-fuzzy inference system (ANFIS) integrated with LMS based synchronous detection method inst. The dc side voltage of the DSTATCOM is regulated with ANFIS controller. An adaptive hysteresis current controller based on ANFIS is implemented to obtain the switching pulses for inverter of the DSTATCOM. The performance of the proposed controller is simulated using MATLAB/Simulink environment. The simulated response of the control schemes are validated by simulation model of the system. The obtained result shows that proposed DSTATCOM has desired performance.
IET Power Electronics, 2019
This study presents a simplified model predictive control (SMPC) strategy for three-phase T-type ... more This study presents a simplified model predictive control (SMPC) strategy for three-phase T-type neutral-pointclamped (NPC) inverters to reduce the computational effort while achieving the current control, capacitor voltage equalisation and common-mode voltage (CMV) minimisation targets. The approach involves three stages. In the first stage, the number of switching states is reduced from 27 to 19 for reducing the peak CMV. In the second stage, a graphical approach is proposed to identify candidate control set (CCS) based on the present switching state, which helps in reducing the number of computations further. The number of elements in CCS may be 7, 10, 13 or 19. A look-up table with present applied state and its corresponding CCS is formed based on this graphical approach for all the 19 switching states. The third stage involves modifications to the MPC algorithm. Two versions of SMPC schemes (SMPC-I and SMPC-II) are proposed. SMPC-I can restrict the CMV to onesixth of DC input voltage. SMPC-II can achieve near zero CMV. The performance of the SMPC strategy is analysed with parameter uncertainty. Computational effort of SMPC schemes is compared with other MPC methods. The feasibility of SMPC algorithm is verified experimentally on T-type NPC inverter prototype.
Journal of Circuits, Systems and Computers, 2018
This paper presents a reduced control set model predictive control (RCSMPC) method for three-phas... more This paper presents a reduced control set model predictive control (RCSMPC) method for three-phase T-type neutral-point-clamped (NPC) inverter. The whole control set (WCS) consists of all the 27 switching states of T-type NPC inverter. The reduced control set (RCS) with 19 switching states is formed from WCS by excluding the switching states with common mode voltage (CMV) value higher than one-sixth of input DC voltage [Formula: see text]. With RCS, single-objective model predictive current control method can restrict the CMV peak value to [Formula: see text]. To further reduce the CMV below this threshold, a cost function with the weighted sum of two control targets is formulated in the RCSMPC method. The two control targets of RCSMPC method are CMV mitigation and load current control. The weight for CMV is called bias factor. The RCSMPC method is computationally efficient, as the number of switching states is less than that of WCSMPC. To further reduce the computational burden, CM...
International Journal of Power Electronics and Drive Systems (IJPEDS)
In this manuscript, the single stage boost inverter is proposed to eliminate the common-mode volt... more In this manuscript, the single stage boost inverter is proposed to eliminate the common-mode voltage (CMV) and electromagnetic interference (EMI) in the motor drives. The proposed topology has the capability of eliminating the effects of intrinsic CMV without any additional filters, active or passive elements, and modified pulse width modulated (PWM) techniques. This topology is proposed with the rearrangement of filter components from ac side to mid place in such a way that the capacitor constantly clamped to the DC bus, and the inductor is placed at the mid-point of half-bridge module and supply to achieve the high gain. This arrangement is also eliminating the effect of switching natured common-mode voltage, which generally occurs in any conventional PWM inverter. Conventional PWM techniques can be implemented to this topology without any modification in the control strategy. The proposed topology is simulated in a MATLAB Simulink to verify the operation and CM reduction capabili...
Uploads
Papers by Koritala Chandra Sekhar