一种静止无功发生器的改进模糊自适应PI控制策略

针对静止无功发生器(SVG)传统控制策略自适应调节能力不足的问题,对传统控制策略进行改进。在内环解耦控制的基础上,引入模糊控制对PI参数进行自适应调整,以提高SVG的补偿精确性。传统模糊PI控制以PI的初始参数为中心进行上下调整,因此调节范围有限。针对调节有限的问题,文中提出采用累加的方式调整PI参数,根据系统变化,在参数调整过程中,不再以初始参数作为调整基准,而是采用上一时刻的值作为基准进行调整,从而增大调节范围,实现PI参数的自适应调整。仿真分析表明,与现有的模糊PI控制策略相比,文中策略进一步提高了补偿精确性,增强了系统的动态特性。

An improved fuzzy adaptive PI control strategy for static var generator

Aiming at the problem of inadequate adaptive regulation ability of traditional control strategy of SVG, the traditional control strategy is improved. On the basis of inner loop decoupling control, fuzzy control is introduced to adjust PI parameters adaptively to improve the compensation accuracy of SVG. The traditional fuzzy PI control takes the initial PI parameters as the center and adjusts up and down, and the adjusting range is limited. Aiming at this problem, the method of accumulating PI parameters is proposed to increase the adjusting range. The simulation results show that compared with the existing control strategies, the compensation accuracy is further improved and the anti-disturbance performance of the system is enhanced.