Boost Type Two-Stage Multi-Input High Frequency Link’s Inverter with Multiple Windings Simultaneous Power Supply

The single new energy power supply method has defects such as instability and discontinuousness. In order to improve the flexibility and stability of the power generation system and achieve the preferential utilization of new energy, this paper proposes a Boost type two-stage multi-input high frequency link's inverter with multi-winding simultaneous power supply, and the circuit topology, energy management control strategy (EMCS), high frequency switching process and active clamp circuit design of the inverter are studied and important conclusions are obtained. The circuit topology is composed of a two-level cascade of a multi-input Boost DC-DC converter and a Buck inverter. The front stage adopts the maximum power output phase-shifting pulse width modulation (PWM) control strategy with power limit. The rear stage adopts the single- polarity twice-frequency sinusoidal pulse width modulation (SPWM) control strategy. The maximum power output of multiple input sources is adjusted by controlling the DC bus voltage. The designed and developed 1kVA dual-input inverter prototype has excellent performance such as high frequency isolation between output and input and multiple input sources, small volume and weight, wide duty cycle adjustment range, high conversion efficiency, etc., which verifies the feasibility of circuit topology and EMCS.