分布式风光储系统双向DC-DC变换器研究

文中提出了一种分布式风光储系统的架构,并重点研究系统中连接蓄电池和直流母线的双向DC-DC变换器。双向DC-DC变换器能够实现太阳能阵列、风机、电网和蓄电池之间的能量交换、调节母线电压,是风光储系统的关键部分。本文采用高变比的双有源全桥变换器构成双向DC-DC变换器,它既能连接较低输出电压的蓄电池和高压直流母线,又能通过移相控制实现功率双向流动和软开关。本文研制了一台3 k W风光储系统样机,在不同工况下测试了双向双有源DC-DC变换器的功能。

Research of distributed wind-photovoltaic-storage system bidirectional DC-DC converter

This paper proposes a system topology structure of the distributed wind-photovoltaic-storage system and mainly researches on a bidirectional DC-DC converter which connects the battery and DC bus.The bidirectional DC-DC converter can implement the power exchange among solar panels,wind turbine,grid and the battery,and adjusts the busbar voltage,which is the key part of the whole system.We use high step up double active full bridge DC-DC converter as the bidirectional DC-DC converter.It can connect the low voltage battery and the high voltage DC bus,and furthermore,it can implement the bidirectional power flow and soft switching by phase shifted control.A 3kW prototype is built up to test the bidirectional DC-DC converter under different working conditions.