考虑储能荷电状态的附加功率调节的混合微电网协调控制

Coordinated Control of Hybrid Micro-Grid Considering Additional Power Regulation of Energy Storage SOC

提出一种附加功率调节的混合微电网协调控制策略,对光伏和储能组成的交直流混合微电网的功率分配问题进行研究。考虑直流负荷大小和荷电状态(SOC)变换,给出一种加入两个比较器的电压外环电流内环双环控制,实现储能在不同负荷情况下充放电,防止储能过度充放电。针对储能处于停机模式时系统功率不平衡问题,基于上层控制设计分布式电源的多模式切换算法,求得附加功率实时调整交直流微电网连接的双向DC/AC变换器的输出功率。搭建光伏-储能交直流混合微电网仿真模型,各分布式电源能够根据不同的运行模式快速分配功率,协调维持系统的稳定运行,验证了所提控制策略的有效性。

This paper proposed an additional power regulation hybrid micro-grid coordinated control strategy to research on the AC/DC hybrid micro-grid power distribution problems composed by PV-energy storage.Considering the DC load and SOC transformation,this paper gave a kind of double-loop control of voltage outer loop and current inner loop with two comparators to realize the charge and discharge control of energy storage under different loads,so as to prevent the energy storage from excessive charge and discharge.In allusion to the unbalanced power system problem when the energy storage was in shutdown mode,the multi-mode switching algorithm of distributed generation was designed based on the upper control,and the additional power was obtained to adjust the output power of the bidirectional DC/AC converter connected with the AC/DC micro-grid in real time.The simulation model of PV-energy storage AC/DC hybrid micro-grid was built and the distributed generation can rapidly distribute power according to different operation modes,coordinate and maintain the stable operation of the system,which verifies the effectiveness of the proposed control strategy.