工厂配电系统电能质量仿真与治理方案研究

Research on power quality simulation and enhancement scheme of the distribution system of factory

针对某汽车厂车身车间电能质量治理的需要,提出了一种动态无功补偿器和有源滤波器并联运行的补偿方案。给出了无功补偿器和两台APF并联运行的主电路,优化CT的安装位置,实现了谐波电流的前馈、反馈控制。设计了无功补偿器的参数,分析了无功补偿器分组投切和有源滤波器的控制策略,并采用电磁暂态分析程序(EMTP)对提出的方案进行了仿真。仿真结果和现场测试结果吻合,该方案能显著提高10/0.4kV系统功率因数,并使注入电网的谐波电流达到IEEE 519-1992的要求。

In response to the requirements of power quality enhancement project of the automobile factory, this paper proposes a hybrid compensation scheme based on a combination of dynamic reactive power compensator and a dual active power filters topology. The power stage of the hybrid compensation system is presented, and an optimized current sensor （CT） position is pointed out such that a feed-forward plus feedback control algorithms can be implemented simultaneously. The designing procedure for reactive compensator as well as its switching strategies is discussed, and the control strategy for the dual active filters is also presented. Electromagnetic transient program （EMTP） is used for digital simulations based on the field data and the derived system parameters. It＇s revealed that the proposed scheme can improve significantly the power quality of the 10/0.4kV distribution system, and the harmonic injection to the utility grid can be within the limit of IEEE 519-1992 standard.