Active Capacitor Design Based on Differential Frequency Reactive Power Theory

Aiming at the shortcomings of electrolytic capacitors such as large size, short life and poor environmental adaptability, resulting in low power density and poor system reliability, this paper proposes an active capacitor that can be applied to high-power occasions. Traditional active capacitors can often only be used in small and medium-power occasions, and the active capacitors designed in this paper can use the theory of difference frequency reactive power to convert high-frequency power into low-frequency power and improve the utilization rate of active capacitors, so as to realize the replacement of electrolytic capacitors by active capacitors in high-power systems. In order to verify the reliability of the difference frequency reactive power theory, this paper designs an active capacitor topology based on the difference frequency reactive power theory, and builds a MATLAB/Simulink experimental simulation platform, and the simulation results show that the active capacitor can compensate for the inherent double frequency fluctuation of the inverter in a high-power system.