考虑储能优化的直流微电网协调控制研究

Coordination control of DC microgrid considering energy storage system optimization

文章提出一种基于移相控制双半桥变换器的独立直流微电网协调控制策略。该策略以稳定母线电压和平衡系统有功功率供需为主要目标,根据母线电压波动改变移相角控制储能电池功率,确保独立直流微电网稳定可靠运行。采用双半桥变换器可实现储能电池电气隔离,移相控制可提高双半桥变换器升压比,进而提高储能系统的安全性。利用Matlab/PSIM联合仿真平台搭建独立直流微电网模型进行分析,仿真结果表明该协调控制策略可稳定储能电池输出功率,扰动发生时电压波动小、响应速度快,有效提高了系统可靠性。

A phase-shifting controlled dual half bridge converter based coordination control strategy is proposed for autonomous DC microgrid. With bus voltage stability and supply and demand balance of active power as primary targets, the strategy changes the phase angle in terms of the bus voltage fluctuation to control the power of storage energy batteries, which ensures the stable and reliable operation of the autonomous DC microgrid. The use of the dual half bridge converter can achieve the electrical isolation of the batteries, and the phase shift control can improve the step-up ratio of the converter so as to enhance the safety of the energy storage system. The autonomous DC microgrid model is established and analyzed by virtue of Matlab/PSIM joint simulation platform. Simulation results show that the coordination control strategy can stabilize the output power of the energy storage batteries. The small voltage fluctuation and the fast response speed when disturbances happen demonstrate that the method can effectively improve the system reliability.