MCR电压无功动态加权模糊控制系统

MCR voltage-reactive power dynamic weighted fuzzy control system

利用磁控电抗器解决电缆接线多、小水电集中上网地区无功倒送导致的电压抬升和功率因数波动,针对恒压、恒功率因数等单一模式无法同时兼顾电压及功率因数的问题,提出了综合考虑电压及功率因数的动态加权模糊控制策略,设计的控制系统主要包括恒压和恒功率因数模糊控制2个模块,输出量为电流增量,经过电流前馈环节计算得到MCR待注入电网的电流量,进而产生触发信号控制MCR输出的感性无功,实现电压无功的平滑无级调节。并通过仿真算例对该控制策略的效果进行研究,与传统PI闭环控制模式进行了对比。研究表明:控制系统具有良好的负载跟踪特性,能够实时跟踪系统电压及功率因数的变化;与传统PI闭环控制模式相比,其超调量更小及调节时间更短。

Magnetic control reactor was used to solve voltage rise, and power factor fluctuation caused by reac- tive power inversion in a large number of cable wiring, and small hydropower concentrated region, for the constant voltage and the constant power factor single mode cannot consider both voltage and power factor, the paper propose a dynamic weighted fuzzy control strategy that comprehensive consider voltage and power factor. The design of con- trol system was mainly composed of dynamic weighted fuzzy constant pressure and constant power factor control of two modules,its output was the current increment, MCR to be injected into the grid current was calculated by cur- rent feedforward, then generate a trigger signal to control the output perceptual reactive power of MCR, achieving smooth and steeples adjustment of voltage reactive power. In the end, through simulation examples to study the effect＂ of this control strategy, and compare the traditional PI closed-loop control mode. The study showed that control sys- tem has good load tracing features, and was able to track the change of system voltage and power factor. Compared with traditional PI close-loop control mode, it has a smaller overshoot volume and shorter regulating time, has the good engineering practical value.