Performance Improvement of Shunt Active Power Filter with Time-Domain Integral Filter Under Non-Ideal grid Voltage Conditions

Document Type : Original Article

Authors

1 Department of Electrical Engineering, Arak University of Technology, Arak, Iran

2 Department of Electrical Engineering, Arak University of Technology< Arak, Iran

Abstract

This paper presents a new algorithm for controlling a time-domain shunt active power filter under different network voltage conditions (symmetric, harmonic, asymmetric, asymmetric, and harmonic) using a positive sequence current principal component extractor based on a second-order filter. In this method, since the extraction process is initiated using only the α-β-0 transform, the reduction in the number of filters required as well as the computational burden is evident. In addition, the positive sequence voltage principal component is used in a similar way to synchronize and generate the compensation current to keep the DC-link voltage constant. The effective capability of harmonic compensation of the load current, despite the unbalanced and harmonic nature of the grid voltages, can be considered the main advantage of the proposed scheme. The performance of the proposed control algorithm has been verified and verified through simulation and experimental studies under different operating conditions. This method can be used in industrial applications due to its low computation, good flexibility, reliability, ease of implementation, and use in all grid voltage anomalies.

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