Papers by Seyed hossein Hosseini
International Conference on Electrical and Electronics Engineering, Dec 1, 2011
This paper presents a single-phase grid-connected photovoltaic power system with the capability o... more This paper presents a single-phase grid-connected photovoltaic power system with the capability of maximum power point tracking (MPPT) of photovoltaic (PV) array and reactive power compensation. This topology employs a boost converter to track the maximum power point of PV array and a dual flying capacitor multicell (DFCM) converter in order to connect to the grid. The proposed system can fulfill comprehensive reactive power performance even when the PV power is unavailable. The four-cell nine-level DFCM converter, controlled with modified PSPWM, has improved output voltage frequency spectrum, and low harmonic distortion with reduced number of switches among nine-level inverters. The simulation results, developed in MATLAB software, verify the performance and advantages of the proposed system.
IET Renewable Power Generation
2021 IEEE Electrical Power and Energy Conference (EPEC), 2021
Fault detection and reconfiguration in faulttolerant converters may complicated and necessitate u... more Fault detection and reconfiguration in faulttolerant converters may complicated and necessitate using allpurpose microprocessors and high-speed sensors to guarantee the satisfactory performance of power converters. Therefore, providing fault-clearing feature without increasing the processing and sensing burdens and reducing the transition time between faulty to normal state are of great importance. This research proposes a new redundant-switch configuration to address the mentioned challenges. The proposed configuration uses one diode and two fuses to eliminate the faulty switch and replace the reserve one, spontaneously. Open-circuit fault in the proposed configuration is clarified instantly. Moreover, the short-circuit fault is dealt as an open-circuit fault by using a fuse. Thus, the fault-tolerant feature of the proposed switch configuration is achieved without using a complex, versatile and multifaceted fault managing unit. Resultant behaviors of the case studies are derived using MATLAB/SIMULINK. Also, steadystate thermal distribution of power switches which are implemented on a monolith heat sink, analyzed in COMSOL Multi-physics environment. Finally, the viability of the proposed configuration is demonstrated by a laboratory-scaled prototype.
2002 IEEE 33rd Annual IEEE Power Electronics Specialists Conference. Proceedings (Cat. No.02CH37289)
This paper presents a novel fuzzy logic based control method for shunt active filters. Since the ... more This paper presents a novel fuzzy logic based control method for shunt active filters. Since the fuzzy sets are based on linguistic description, therefore they don't need to the mathematical model of the investigated systems. The proposed method is very suitable to nonlinear and time variant loads. The controller is robust, reliable and it has a smooth response. Also transient response of method is much better than the other classical methods. The simulation results confirm the suitable performance of the filter using this control method.
2009 International Conference on Electrical and Electronics Engineering - ELECO 2009, 2009
The grid-connected photovoltaic (PV) power generation system is expected to be more widespread in... more The grid-connected photovoltaic (PV) power generation system is expected to be more widespread in distribution systems due to increasing fossil-fuel cost. This paper presents a control system that combines photovoltaic (PV) grid connected generation and power quality managements with two system configurations. The system can not only realize photovoltaic generation, but also suppress current harmonics and compensate reactive power.
This paper presents some techniques for reduction of transformer inrush current. The equation of ... more This paper presents some techniques for reduction of transformer inrush current. The equation of inrush current is obtained and then by using these methods, transformer inrush current is reduced, then after comparing the result of each method, the best choice is determined. Results which have been obtained from EMTP simulation confirm these subjects.
In this paper, a new configuration for symmetrical and asymmetrical multilevel inverters is propo... more In this paper, a new configuration for symmetrical and asymmetrical multilevel inverters is proposed. In asymmetric mode, different algorithms are suggested in order to determine the magnitudes of DC voltage sources. The merit of this topology to the conventional symmetric and asymmetric inverters is verified by the provided comparisons. This topology uses a lower number of power electronic devices such as switches, IGBTs, diodes, related gate driver circuits and DC voltage sources. Owing the lower amount of requirements, it has lower total costs and needs less installation area. Also the control strategy has less complexity. The proposed converter can generate all the desired output voltage levels with positive and negative values. To confirm the practicability of the proposed inverter, simulation and experimental results are provided which are in good agreements. Review History: Received: 21 November 2016 Revised: 11 December 2017 Accepted: 18 June 2018 Available Online: 1 July 2018
2009 International Conference on Electrical and Electronics Engineering - ELECO 2009, 2009
This paper presents a new control scheme for the conventional transformerless hybrid active power... more This paper presents a new control scheme for the conventional transformerless hybrid active power filter (HAPF). This HAPF is intended for harmonic and reactive power compensation. The main difference between this control scheme and the classical control methods is that it can compensate the reactive power dynamically. The effectiveness of the proposed control scheme has been verified using computer simulation.
To restore the load voltage, Dynamic Voltage Restorer (DVR), which is installed between the suppl... more To restore the load voltage, Dynamic Voltage Restorer (DVR), which is installed between the supply and a sensitive load, should inject voltage and active power from DVR to the distribution system during voltage sag. Due to the limit of energy storage capacity of DC link, it is necessary the minimize energy injection from DVR. In this paper the techniques of the supply voltage sag compensation in a distribution feeder are presented. In addition, a concept of inter-line dynamic voltage restorer (IDVR) that two DVRs in two different voltage distribution system are connected to a common DC link capacitor is proposed. One of these two DVR (low voltage) operates in voltage sag compensation mode and a novel control technique uses to inject minimum energy from DC link capacitor to low voltage distribution system. The other DVRs (medium voltage) controls the voltage of DC link capacitor so that energy flows from medium voltage distribution system to the DC link capacitor. Simulation results ...
2021 31st Australasian Universities Power Engineering Conference (AUPEC), 2021
In this paper, a non-isolated high step-up DC-DC converter has been proposed for renewable energy... more In this paper, a non-isolated high step-up DC-DC converter has been proposed for renewable energy applications. The proposed structure converter has been derived from the fundamental Zeta converter, in both of which only a single switch is employed. The voltage gain ratio has considerably enhanced in this converter with the absence of using switched capacity. To magnify voltage gain of the converter, a coupled-inductor has adopted. Increase and decrease of gain by changing the ratio of coupled-inductor assist the duty cycle. The number of components is low in this structure. The operating principle and evaluation of the proposed converter, considering designing approaches for elements, are discussed in detail. To verify the feasibility of the proposed converter, simulation results have been provided and evaluated.
Applied Sciences, 2018
Interleaved dc-dc converters in sensitive applications necessitate an enhanced reliability. An in... more Interleaved dc-dc converters in sensitive applications necessitate an enhanced reliability. An interleaved converter equipped with redundant components can fulfill the reliability requirements. Mean Time to Failure (MTTF), as a reliability index, can be used to evaluate the expected life span of the mentioned converters. The Markov model is a helpful tool to calculate the MTTF in such systems. Different scientific reports denote different failure rates with different weight for power elements. Also, in reliability reports, failure rates of active and passive components are uncertain values. In order to approximate the failure rates fuzzy-logic-based Markov models are proposed in this paper. Then it is used to evaluate the MTTF of an interleaved multi-phase dc-dc converter, which is equipped with parallel and standby switch configurations. For the first time, fuzzy curves for MTTFs of the converters and 3D reliability function are derived in this paper. The reliability analyses give ...
International Journal of Electrical Power & Energy Systems, 2017
This paper investigates the design of robust distributed voltage and frequency control for a self... more This paper investigates the design of robust distributed voltage and frequency control for a self-organized microgrid. A multiagent distributed secondary hierarchy is proposed using control Lyapunov function. Power resources are categorized as controllable and uncontrollable distributed generations (DG). Controllable DGs are exchanging information with neighbor DGs through agents at communication layer. The agents communicate to restore the voltage and frequency to their nominal references. Furthermore, the proposed scheme is robust against the insufficient data from uncontrollable DGs, since it provides an improved and stable operation even when there is no communication with uncontrollable DGs and loads. It can actively compensate for the random unknown demand and generation, by sharing the power mismatch in distributed droop architecture. It is shown that the suggested controller is capable of stabilizing an uncooperative microgrid in which not all DGs are cooperating. Also, the convergence speed of the system is improved using the finite-time controller. The performance and finite-time stability of a microgrid with partially-cooperative DGs is proved using Lyapunov theorem and is validated through numerical simulation. The results show improved transients, accurate steady state values for voltage and frequency control of a microgrid, and robustness against communication architecture variations. The impact of communication delays, the uncertainty in coupling gains of the communication links, and the timeinterval between updating the controller and the states through communication are investigated.
2006 37th IEEE Power Electronics Specialists Conference
A new soft switching active snubber cell with constant configuration is proposed. The proposed ac... more A new soft switching active snubber cell with constant configuration is proposed. The proposed active snubber uses an auxiliary switch to recover stored energy in the snubber capacitor during turn off of the main switch. Complete analysis for the boost converter is given and the results obtained for other DC/DC converters are reported. Soft switching commutation is achieved for all semiconductor devices and consequently the switching losses and electromagnetic interference (EMI) are considerably reduced. Both simulation and experimental results are presented.
This paper presents a single-phase grid-connected photovoltaic power system with the capability o... more This paper presents a single-phase grid-connected photovoltaic power system with the capability of maximum power point tracking (MPPT) of photovoltaic (PV) array and reactive power compensation. This topology employs a boost converter to track the maximum power point of PV array and a dual flying capacitor multicell (DFCM) converter in order to connect to the grid. The proposed system can
10th IEEE International Conference on Electronics, Circuits and Systems, 2003. ICECS 2003. Proceedings of the 2003
10th IEEE International Conference on Electronics, Circuits and Systems, 2003. ICECS 2003. Proceedings of the 2003
4th Int. Conf: on Electrical and Electronics …, 2005
A hybrid filter constructed of a shunt active filter and distributed passive filters used for pow... more A hybrid filter constructed of a shunt active filter and distributed passive filters used for power quality improvement in PV power generating systems is presented. The distribution system consists of a photovoltaic power generation system and several ...
Uploads
Papers by Seyed hossein Hosseini