Four-Switch Inverter Based Hybrid Power Filter Optimized By Meta-Heuristic Algorithm of SPEA

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.