Time-Sharing Power Supply Multi-Input DC Converter Type Two-Stage Three-Phase Micro-Grid Power Supply System

In this paper, Time-Sharing Power Supply MultiInput Dc Converter Type Two-Stage Three-Phase Micro-Grid Power Supply System is proposed, which is composed of a timesharing full-bridge Buck-type multi-input DC converter cascaded with a three-phase four-wire inverter with capacitor mid-point balancing circuits, and the energy storage batteries are connected in parallel to both ends of the intermediate DC bus; the front-stage multi-input DC converter adopts energy management PWM control strategy with multiple new energy maximum power outputs, and the back-stage capacitor mid-point balancing circuit and the inverter adopt voltage-current double closed-loop PWM control strategy and bipolar SPWM control strategy, respectively. The front-stage multi-input DC converter adopts the energy management PWM control strategy with multiple new energy maximum power outputs, and the back-stage capacitor mid-point balancing circuit and inverter adopt the voltage-current double-closed-loop PWM control strategy and bipolar SPWM control strategy, respectively. The topology, energy management control strategy, power supply mode and steady-state principle characteristics of the power supply system are studied in depth, and important conclusions and key circuit parameter design guidelines are obtained. The simulation of the 3kVA 240~360VDC/600VDC/380V50HZAC power supply system confirms the feasibility and correctness of the proposed scheme and theoretical analysis.