The PWM phase-shifted plus feed-forward control of the boost converter applied in supercapacitor energy storage system

High-power boost converter is an important part in supercapacitor energy storage system. The decline of supercapacitor´s terminal voltage should be considered when design the converter. The advantages and disadvantages of the asymmetry half-bridge bidirectional converter are discussed. A novel PWM phase-shift plus feed-forward control method was proposed, which uses input voltage feed-forward to control duty cycle and output voltage feed-back to control phase shift angle. This control strategy could reduce the peak current of the transformer´s leakage inductance, promote the converter´s efficiency and ensure the switches´ ZVS. The converter´s operation is analyzed and the average model and small signal model are built. The control system was designed. The control strategy was verified by simulation.