一种低压微电网中的分布式电压控制算法

摘要

To achieve voltage control and improve the power supply capacity, a distributed algorithm for voltage control in the microgrid is proposed with active power injections provided by DGs. First, for the property of line impedance in the low voltage microgrid, the relationship between voltage and active power is analyzed. Then, a communication link is established according to the system structure, and the bus voltage that exceeds the upper and lower limit is initiated by computing the active power needed. Based on the local information, the bus voltage is corrected by a parametric state transition matrix with the consideration of active power capacity limits. Eventually, the active power of DGs is coordinated and distributed through the algorithm to achieve voltage control collectively. Simulation results show that the proposed algorithm can effectively achieve voltage control and decrease voltage deviation, so as to improve the voltage quality.%为了实现电压调节和提高供电能力，提出了一种在低压微电网中利用分布式电源(Distributed Generators，DGs)发出的有功来进行电压控制的分布式电压算法。针对低压微电网的线路阻抗特性，分析了电压和有功的关系。由系统线路结构建立通信链路，并对电压超出上下限的母线初始化，计算出所需补偿的有功功率。基于本地信息，利用参数化状态转移矩阵对电压进行修正，并考虑了分布式电源的有功容量限制。通过该算法协调和分配各分布式电源所需承担的功率，共同作用实现电压控制。仿真结果表明该算法能够有效实现电压调节和减小电压偏差，提高电压质量。