Hybrid Decoupling Controlled Active Power Compensator for the Ultralow-Frequency Pulse Load With Reversed Power Application

In the application of ultralow-frequency pulse load with reversed power, the pulse load is directly supplied by the battery. However, the random and multistate instantaneous output power results in voltage fluctuation across the battery. The uncontrollable reversed power will cause irreversible damage to the battery. To satisfy the requirements for voltage fluctuation, the active power compensator (APC) is introduced to provide pulsed power and absorb reversed power. The hybrid decoupling control scheme composed of linear current control and nonlinear voltage control is proposed for the APC, which can suppress the voltage overshoot and undershoot effectively when pulse repetition frequency or instantaneous output power changes. To improve the stability of the system at the mode transitions, several methods are proposed in the control scheme. The methods of updating integral error directly and the step control aim to accelerate the process during mode transients. Finally, to verify the effectiveness and viability of the proposed control scheme, a prototype is fabricated in the laboratory with pulsed power at 2250 W, reversed power at 1350 W, and pulse repetition frequency at 1.6–1.8 Hz.