Abstract:

A new implementation method for single-phase shunt active power filter (APF) with single closed-loop control strategy is presented. The ideal compensation current instruction is deduced with single PQ theory, which applies with actual and virtual quartered single-phase current and voltage. Based on the ideal compensation current, the practical compensation current instruction is achieved with power predictive algorithm. Because the power predictive algorithm is adopted, the single closed-loop control strategy can be used in APF application. There is no voltage control loop in the implementation method, so the method has many favorable characteristics, such as easy designing, fast responding, strong robustness, etc. The different conditions of APF, such as startup, normal operation and load change, are also researched in the paper. The validity of implementation method for APF is proved by simulation and experimental results.

Key words: single-phase circuit; shunt active power filters; compensation current instruction; power predictive algorithm