基于本地自适应调节的交直流混合微电网全局协调控制

Global coordination control for AC/DC hybrid micro-grid based on local adaptive regulation

针对交直流混合微电网,提出了一种基于本地自适应调节的微电网全局协调控制策略。对直流子微网内的分布式电源(DG)设计模糊自适应下垂控制,通过自动调节下垂系数消除线路阻抗的影响,实现直流子微电网内部有功功率的精确分配。对交流子微电网内的分布式电源,设计基于同步补偿的改进下垂控制,从而消除线路阻抗的影响,保证有功功率均分的同时实现无功功率均分。在本地调节的基础上,设计计及储能参与的混合微电网全局协调控制策略,消除频率/电压偏差并恢复至额定值,实现交直流子微网间、子微网与储能系统间功率的合理流动和自主分配。与此同时制定功率交换控制规则,以避免不必要的功率交换,降低了功率损耗并延长了储能寿命。运用MATLAB/SimuLink仿真平台,对所设计控制策略的有效性进行验证。

A global coordination control strategy for AC/DC hybrid micro-grid based on local adaptive regulation is proposed in this paper. In order to eliminate the effect of line resistance and realize the accurate allocation of active power within DC sub-microgrid, the fuzzy adaptive droop control is designed to the distributed generation(DG) in DC micro-grid. In order to eliminate the effect of line impedance and realize reactive power sharing and active power sharing, an improved droop control strategy based on synchronous signals is designed to the distributed generation in AC micro-grid. Based on local regulation, the global coordination control strategy is designed for hybrid micro-grid considering energy storage, which can eliminate frequency/voltage deviations and restore to rated values, which can achieve a reasonable and autonomous power flow between AC sub-microgrid and DC sub-microgrid, and between sub-microgrid and energy storage systems. Meanwhile, the power exchange control law is formulated to avoid unnecessary power exchange, reduce the power loss and extend energy storage life. Finally, the effectiveness of the proposed control strategy is verified by simulation platform of MATLAB/Simulink.