Sine-Cosine Algorithm Based Second Harmonic Current Suppression Applied for Single-Phase Converter of Hybrid System

The use of second harmonic current compensator without electrolytic capacitors can not only effectively suppress the second harmonic current, but also remove the electrolytic capacitors in the two-stage single-phase converter, thereby improving system stability. In order to solve the problem of parameter perturbation of the second harmonic current compensator, this paper propose a method by applying sine cosine algorithm (SCA) to iterate and optimize the parameters of the current regulator for second harmonic current compensator control loop to ensure that the second harmonic current compensator can still work stably in complex actual working conditions. The proposed method has good performance, fast iteration and robust stability. The calculation process and simulation results of application of SCA in hybrid system in this paper verify the effectiveness of the proposed method.