一种基于多目标的微电网无功优化控制策略

A Ｒeactive Power Optimization Control Strategy Based on Multi － objective for Micro － grid

摘要:

微电网中分布式电源的随机性和间歇性特性让电网的稳定性面临严重挑战,而目前多数针对微电网最优潮流的研究未考虑系统的稳定性和对波动的快速恢复能力。在此基于简化L指标的静态无功优化控制策略,通过建立多目标优化模型系统同时考虑系统经济性、稳定性和动态无功备用最大化,有效保证了电网运行过程中的电压稳定性和波动的快速恢复。将改进的IEEE 14节点系统作为算例进行仿真实验并将所提的多目标函数和传统的经济性目标函数作对比,结果表明采用所提策略在满足经济性的前提下,电网的稳定性更好、动态无功备用也更多,验证了所提方法的有效性。

Abstract:

The randomness and intermittence characteristics of distributed generation make the stability of power grid face serious challenges，but most of the researches on optimal power flow of micro － grid do not consider the stability of the system and the fast recovery of the wave． A static reactive power control strategy based on simplified L indicator is presented，and by establishing the multi － objective optimization model with the consideration of economy，system stability and dynamic reactive power reserve maximization，it effectively guarantees the voltage stability and the rapid recovery of voltage volatility during the operation of power grid． Taking the modified IEEE 14 bus system for example，the simulation experiment and the comparison of multi － objective function and the traditional economic objective function are carried out． The results show that the proposed strategy has better stability and more dynamic reactive power reserve while meeting the demand of economy，which verifies the effectiveness of the proposed method．