低压配用电系统两级无功补偿控制研究

为了提高低压配用电系统中的功率因数、降低线损、稳定用户端电压,提出了一种多DSTATCOM快速动态静止型无功补偿与TSC无功补偿相结合,DSTATCOM采用固定电容容量调节其两端电压频率的方法实现无功补偿的调节。采用该方法能够实现快速无级的动态补偿,TSC实现有级无功补偿,把二者结合在一起实现了大容量无功补偿的无级调节,并分析了系统的控制原理及控制策略。两级无功补偿系统具有体积小、成本低、动态响应快等特点。通过实验验证了该方法的可靠性和实用性。

Study of two-stage VAR compensation in low voltage distribution system

In order to improve the power factor, reduce line loss, stabilize user terminal voltage in low voltage power distribution system, this paper proposes a new method to realize VAR adjustment, in which a fast dynamic multi DSTATCOM static VAR compensation and TSC VAR compensation are combined, and DSTATCOM adjusts VAR by changing voltage and frequency between the fixed capacitor capacity. The method can realize stepless speed dynamic compensation, TSC can realize step VAR compensation, and the combination of the two achieves the stepless adjustment of high-capacity VAR compensation. The control principle and control strategy of the system are analyzed. Two-stage VAR compensation system has the characteristics of small volume, low cost, fast dynamic response, etc. Experiments show that the method is reliable and practical.