Industrial Electronics
Poorya Rahmati kahkha; Alireza HossienPour; Ahmad Khajeh
Abstract
Power electronics converters application has increased in the modern distribution systems due to their advantages to control and process the power flow. Unfortunately, these converters generate harmful harmonics and inject to the grid. The modern standards of the systems accepts which the grid includes ...
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Power electronics converters application has increased in the modern distribution systems due to their advantages to control and process the power flow. Unfortunately, these converters generate harmful harmonics and inject to the grid. The modern standards of the systems accepts which the grid includes harmonics but they have to be less than specified value. In order to satisfy standards, power filters must be added to nonlinear loads. In this paper, a new hybrid power filter is proposed which achieves them. Furthermore, the conventional six-switch inverter of active power filters is substituted to decrease the overall cost and complexity of the system. In order to design the parameters of the passive part of the filter, the SPEA-II meta-heuristic optimization algorithm is used which minimized the overall cost as well as harmonics suppression. Consequently, the four-switch inverter along with optimized design of the passive part makes the proposed hybrid active filter attractive for practical applications. The THD of the injected current to the grid as a critical index in different nonlinear and dynamic loads is less that 2%. Simulation results in different scenarios show the effectiveness of the proposed hybrid filter.
Optimization
Alireza HossienPour; Ahmad Khajeh
Abstract
In this paper, the effects of magnetization patterns on the performance of Hybrid Electrical Vehicle (HEV) are investigated. HEVs have three magnetic field sources: armature winding, permanent magnets, and field winding. To initiate the investigation, the magnetic field distributions produced by these ...
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In this paper, the effects of magnetization patterns on the performance of Hybrid Electrical Vehicle (HEV) are investigated. HEVs have three magnetic field sources: armature winding, permanent magnets, and field winding. To initiate the investigation, the magnetic field distributions produced by these three sources are obtained. By using the magnetic field distributions, the machine is analyzed under no-load and on-load conditions, and the operational indices, such as self and mutual inductance, cogging-, reluctance- and instantaneous torque, and unbalance magnetic force (UMF) in x- and y direction are calculated. Various magnetization patterns are considered to investigate their influences on the performance of the machine. This step was done with Maxwell software. Furthermore, instantaneous torque and magnitude of UMF are expressed in term of pole arc to pole pitch ratio by using artificial intelligence. The optimal of the pole arc to pole pitch ratio to maximize the average of instantaneous torque and minimize the magnitude of UMF by some multi-objective algorithms is also computed. The modeling and optimization are performed by Matlab Software.
Industrial Electronics
Alireza HossienPour; Reza Ghazi
Abstract
Harmonic reduction is an essential issue in a grid-connected variable-speed wind energy conversion system to decrease the electrical losses of the system and improve the power quality. In this paper, a new Shunt Active Filter (SAF) based on a three-phase four-switch inverter is used to improve the output ...
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Harmonic reduction is an essential issue in a grid-connected variable-speed wind energy conversion system to decrease the electrical losses of the system and improve the power quality. In this paper, a new Shunt Active Filter (SAF) based on a three-phase four-switch inverter is used to improve the output current harmonics of the wind energy conversion system. The SAF contains three parts: identification, modulation, and inverter. In the proposed filter, an identification algorithm, which is not sensitive to the input source harmonic, is used to cancel out most harmonics impact. Moreover, a modified modulation technique based on the identification of the output signal is utilized. In the previous active filters, a three-phase six-switch inverter has often been used; however, in the proposed SAF, the number of switches is decreased to four in order to decrease the inverter losses. Simulation results confirm the superior performances of the proposed active filter versus the prior one for a wind energy conversion system.