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 ...
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 ...
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
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 ...
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 ...
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 ...
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
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 ...
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