独立型虚拟同步化微电网分布式无功-电压二级控制策略

Aiming at the primary regulation characteristics of the reactive power - voltage control of an independent virtual synchronous microgrid, on the basis of the virtual synchronous control technology, a distributed reactive power - voltage secondary control strategy for an independent microgrid considering the remaining reactive power capacity of the virtual synchronous converter is proposed. This strategy aims to improve the utilization rate of the system's reactive power capacity and the average voltage level. Through the distributed sparse communication between adjacent virtual synchronous machine controllers, the evaluation of the average per-unit reactive power value and the average port voltage value of the system is realized. On this basis, the optimal reference values of the reactive power - voltage droop parameters of the virtual synchronous converter are obtained through the proposed distributed secondary controller, thereby realizing the optimal distribution of reactive power and voltage regulation, improving the power quality while increasing the utilization rate of the system's reactive power capacity. An independent virtual synchronous microgrid model is built based on MATLAB/Simulink, and the effectiveness of the proposed strategy and its superiority compared with the traditional reactive power - voltage regulation strategy are verified through simulation.

针对独立型虚拟同步化微电网无功-电压控制的初级调节特性,在虚拟同步控制技术的基础上,提出了一种计及虚拟同步变流器剩余无功容量的独立微电网分布式无功-电压二级控制策略。该策略以提高系统无功容量利用率及平均电压水平为目标,通过相邻虚拟同步机控制器间的分布式稀疏通信,实现系统平均无功标幺值及端口平均电压值评估。在此基础上,通过所提分布式二级控制器得到虚拟同步变流器无功-电压下垂参数的最优参考值,从而实现无功功率最优分配与电压调节,在提高系统无功容量利用率的同时改善电能质量。基于MATLAB/Simulink搭建独立型虚拟同步化微电网模型,通过仿真验证了所提策略的有效性及其相较于传统无功-电压调节策略的优越性。