Controller Implementation and Performance Evaluation of a High Power Three-Phase Active Power Filter using Controller Hardware-in-the-Loop Simulation

This paper presents a demonstration of Real-Time High-Speed Controller Hardware-in-the-Loop (CHIL) testing for a DSP-based controller of a Shunt Active Power Filter (APF) for medium voltage (MV) grid power quality improvements. A Real-Time simulator (RT Box) and a Digital Signal Processor (DSP) are used for the CHIL simulation to validate the control algorithms which are implemented in a commercial low-cost DSP. Two control loops have been used in the control system. The filter reference current is extracted based on synchronous reference frame. Hysteresis current control is employed as the inner control loop for generating switching signals. The DC side capacitor voltage of the APF is maintained by a PI controller. The results show the APF associated with the implemented controller can mitigate variety power quality problems, such as harmonic elimination, power factor correction, and load balancing. The whole CHIL simulation system work stable with high switching frequency.