Model Predictive Control of Hybrid Active Filter integrated with high power low frequency VSCs

This paper presents an innovative control method based on Finite Set Model Predictive Control (FS-MPC) to integrate a Hybrid Active Power Filter (HAPF) into the output filter of high-power grid-connected converters. The proposed method aims to effectively mitigate current harmonics at the grid side across a wide range of grid inductance. Importantly, this method allows for the seamless installation of HAPF on existing converters, enabling a decrease in the switching frequency of the main converter without requiring communication between the two converters. The current reference generation relies on prediction, eliminating the need for low Signal-to-Noise Ratio (SNR) current sensors to extract harmonic content of the main converter’s current. Additionally, this approach eliminates the delay introduced by notch and band-pass filters by predicting the next step current instead of measurement or filtering, thereby reducing the required sampling frequency for MPC methods. Real-time simulations have been conducted on the RTDS platform to demonstrate the effectiveness of the proposed method.