Development of active low-frequency current ripple control for clean-energy power conditioner

This study focuses on the design of an active low-frequency ripple control for a clean-energy power conditioning mechanism with an aim to protect clean-energy sources (e.g., solar photovoltaic, fuel cell, etc) from the severe damage of current ripple propagation to expand their life span. First, a simplified circuit for a general power conditioner including a dc/dc converter and a dc/ac inverter is derived, and the dynamic model of the active low-frequency ripple control circuit (ALFRCC) is analyzed. Moreover, an adaptive linear neural network is taken as a neural filter to generate the compensation current command and a total sliding-mode controller (TSMC) is designed to manipulate the ripple control circuit for injecting a suitable compensation current into the high-voltage bus of the conditioner. In addition, the effectiveness of the proposed active low-frequency ripple control scheme is verified by numerical simulations. Its superiority is indicated in comparison with a conventional high-pass filter and a proportional-integral (PI) controller.