基于变论域模糊PI控制的M3C外环控制策略

M3C Outer Loop Control Strategy Based on Variable Univverse Fuzzy PI Control

模块化多电平矩阵变换器可为远程交流电网提供频率控制支持,在高压低频交流输电系统中具有良好的应用前景,但传统外环比例积分(PI)控制器易受到自身参数和负荷变化的影响,控制效果稳定性不高。为此,这里提出了一种变论域模糊PI自适应外环控制策略。利用变论域模糊PI控制的自动感应和自适应能力,实现了外环输入误差大小的自适应和自调整。同时,利用基于函数的伸缩因子方法为输入/输出论域设计伸缩因子,以提高控制精度。仿真和实验结果表明,与传统PI控制相比,该控制不仅提高了系统稳定性,而且增强了自适应调节能力。

Modular multilevel matrix converter can provide frequency control support for remote AC power grids and has good application prospects in high-voltage and low-frequency AC transmission systems,but the traditional outer-loop proportional integral(PI)contrllers are susceptible to change in their own parameters and loads,and the stabil-ity of the control effect is not high.Therefore,a variable universe fuzzy PI adaptive outer loop control strategy is pro-posed.Using the automatic sensing and self-adaptive ability of variable universe fuzzy control,the self-adaptation and self-adjustment of the size of the input error of the outer loop are achieved.Meanwhile,a function-based scaling factor approach is utilised to develop scaling factors for the input and output domains to enhance control accuracy.Simula-tion and experimental results indicate that,in addition to improving system stability,this control enhances self-adap-tivity compared with traditional PI control.