微网并网与孤岛运行模式下的无功优化策略

高渗透率的间歇性分布式电源(DG)使微网在并网或孤岛模式的运行可靠性降低,而传统的无功优化方法往往因忽略微网可靠性导致优化效果较差。依据有功及无功功率充足和电压极限限制,以概率方式来评估微网的可靠性,提出了一种微网在并网及孤岛模式下的无功优化规划模型,以系统年电能损耗最小和微网可靠性最大为目标进行求解。最后,采用PGE 69节点进行算例分析,研究了优化系数的作用效果和算法的鲁棒性,并通过成本-效益分析来确定系统的电容器组的最优容量。结果表明,对微网进行分布式无功电源的优化配置能有效改善网损,并提高系统的可靠性。

Reactive Power Optimization Strategy for Microgrid in Grid Connected and Islanded Operation Modes

High permeability intermittent distributed generation (DG) reduces the reliability of microgrid in grid connected or island mode, while the traditional reactive power optimization methods often neglect the reliability of microgrid, resulting in poor optimization results. The reliability of microgrid is assessed in a probabilistic manner according to the sufficient active and reactive power and voltage limit limits. A reactive power optimization planning model of micro grid in grid connected and island mode is proposed, which aims at minimizing the annual power loss and maximizing the reliability of micro grid. Finally, an example is given by using PG&E 69 nodes. The effect of the optimization coefficient and the robustness of the algorithm are studied, and the optimal capacitor capacity of the system is determined by cost benefit analysis. The results show that the optimal configuration of distributed reactive power supply in microgrid can effectively improve the network loss and the reliability of the system.