直流微电网并网运行协调控制策略研究

为实现直流微电网简洁、高效、灵活的控制,提出了并网运行模式下的直流微电网协调控制策略.通过合理设置各变换器的分段电压阈值,控制分布式发电单元、储能单元以及并网变换器的优先级,使其运行在最大功率状态或下垂控制状态.对于同一个电压等级下的多个变换器通过下垂控制实现功率分配和电压控制.双向AC/DC并网变换器采用双闭环的PWM矢量解耦控制实现与大电网间的功率动态平衡.仿真结果证明了该策略的可行性和有效性.

Research on grid-connected coordinated control strategy for DC micro-network

In order to realize simple, high efficient, and flexible control of DC micro-network, the coordinated control strategy under gird-connected operation mode. By reasonably setiing this paper proposes threshold voltage of converters and controlling distributed generating unit, energy storage unit and priority of grid-connected converter, the converter is guaranteed to operate under maximum power or drop control. As for several converters with the same voltage, power distribution and voltage control are realized by drop control. AC/DC bidirection converter makes the dynamic balance of power between large grids come true by adopting double closed-loop PWM vector decoupling control. The result of simulation proves the feasibility and effectiveness of the strategy.