谐波与无功综合补偿装置的控制策略

Control strategy of synthetic harmonics and reactive power compensation equipment

针对高压大容量负荷谐波抑制和无功补偿的要求,以串联谐振注入式有源电力滤波器为基础结合并联型无源滤波器的谐波和无功综合补偿装置为例,通过结构分析,对常用基本控制策略进行比较。基于此,针对结构特点和应用需求进行有效的分频控制方法的研究,形成一套从基本控制策略选择到具体控制方法实现的综合补偿装置控制系统设计与实施的完整方案。为适应负荷变化频繁的复杂工况,提出采用根据电源谐波电流进行控制的基本策略以提高装置的安全稳定性能,同时利用基于直流分量的PI控制和基于广义积分的模糊自整定PI控制2种方法分别实现谐波电流的有效分频控制,后者不但避免了分频检测的环节,降低了计算量,而且很好地保证了控制效果。

With a synthetic harmonics and reactive power compensation equipment for high-voltage large-capacity harmonics suppression and reactive power compensation as an example,which is based on serial resonance injection active power filter and parallel passive power filter,the widely-used control strategies are compared through structure analysis. The effective frequency-dividing control is studied according to structural features and application requirements,and a complete solution of control system,from control strategy selection to control method implementation,is presented for it. The control strategy with harmonics current is suggested to improve equipment stability under frequent load variation situation. The effective frequency-dividing control is realized by applying DC component PI control or fuzzy PI control,the latter avoids the frequency dividing detection part with lower calculation load and better control effect.