下垂控制在基于固态变压器的高压微电网中的应用

对下垂控制应用于微电网进行了理论分析,指出将其应用于基于固态变压器(SST)的高压微电网的合理性和优越性。研究了下垂系数与微电网动态性能之间的关系,分析了下垂系数对微电网频率稳定范围的影响。在SST的高压变流器中实现下垂控制,并推导了SST的容量与下垂系数的关系。通过一个环形的高压微电网,仿真分析了所提出的下垂控制策略在高压微电网联网运行、孤岛运行以及这2种模式切换时稳定微电网频率和电压的效果。仿真结果表明,各种运行模式下,微电网的电压和频率均具有良好的稳定性。

Application of Droop Control in High-voltage Microgrid Based on Solid State Transformer

The application of droop control in microgrids is analyzed in theory.The rationality and superiority of the method used in high-voltage microgrids based on solid state transformer(SST) are given.The relationship between droop coefficient and system dynamic performance is studied,and the influence of droop coefficient on the stable range of frequency is analyzed.Droop control is achieved through high-voltage converter of SST,and the relationship between droop coefficient and capacity of SST is given as well.A circular high-voltage microgrid is established,the effect of proposed droop control method on stabilizing frequency and voltage in grid-connect mode,islanding mode and the switching period between two modes is simulated and analyzed.Results show that the voltage and frequency of microgid has good stabilizing performance in different modes.