基于潮流计算的环形直流微电网动态负荷精确分配控制方法

针对跨度比较大的采用环形网络结构的直流微电网,首先推导了采用下垂控制时环形直流微电网的潮流计算方法;基于此,对比分析了以下垂系数比和参考电压差值为控制量的动态负荷分配控制方法;进一步地,提出了综合实现动态负荷分配精确控制和负荷端电压跌落补偿的改进下垂控制方法;最后,搭建了四端环形直流微电网的半实物实时仿真实验平台,实验结果验证了所提控制方法的有效性。

Dynamic load accurate allocation method for annular DC microgrid based on power flow calculation

As for DC microgrid with large-span and annular network structure, the power flow calculation method of annular DC microgrid with droop control is firstly deduced. On this basis, the dynamic load allocation control methods with the droop coefficient ratio and reference voltage difference as control variables are compared and analyzed. Furthermore, an improved droop control method is proposed to comprehensively realize accurate control of dynamic load allocation and compensation of load voltage drop. Finally, a hardware-in-the-loop real-time simulation experimental platform of the four-terminal annular DC microgrid is built, and experimental results verify the effectiveness of the proposed control method.