基于MIC反馈的直流微网无差控制策略研究

Research on DC micro-grid deadbeat control strategy based on MIC feedback

针对直流微电网中内部功率不平衡和下垂控制策略具有电压偏移的问题,文章提出了基于MIC(Micro Increment of Current)反馈的直流微网无差控制策略。该策略底层控制以直流母线电压为载体,混合储能采用分段下垂的方式,实现了母线电压的相对稳定,同时以电流微增量MIC信号为内环控制的反馈项,通过周期性更新MIC参考值控制储能系统的实际输出电流,使直流母线电压稳定在额定值。最后,在Matlab/Simulink中进行仿真,仿真结果验证了所提控制策略的可行性和有效性。

In order to solve the problem of voltage offset in the internal power imbalance and droop control strategy in DC micro-grid, a DC micro-grid control strategy based on MIC（Micro Increment of Current） feedback is proposed in this paper. The bottom layer of the strategy is controlled by DC bus voltage, and the hybrid energy storage adopts segmented droop mode to achieve relatively stable bus voltage. At the same time, the feedback item of the MIC signal is controlled by the inner loop, and the actual output current of the energy storage system is controlled by periodically updating the MIC reference value to make the DC bus voltage stable at the rated value Finally, the simulation is carried out in Matlab/Simulink, and the simulation results verify the feasibility and effectiveness of the proposed control strategy.