无直流传感器LC-STATCOM自适应测控方法

Adaptive Measurement and Control Method of LC-STATCOM Without DC Sensor

传统级联H桥型静止同步补偿器(static synchronous compensator,STATCOM)链内子模块均配有大容值稳压电容和电压传感器,导致硬件和维护成本增高。针对这一问题,该文从节省电压传感器和降低电容容值2个方面进行分析,提出一种无直流电压传感器低容值(low capacitance,LC)级联H桥型STATCOM(LC-STATCOM)自适应测控方法。首先,分析零序电压对LC-STATCOM簇电压的影响,并相应提出2种簇电压控制模式,改善电容电压的控制效果;然后,针对传统无直流传感器电容电压检测存在错误的问题,构建适应于LC-STATCOM簇电压控制的电容电压自适应检测方法,规避了影响检测结果的特殊模态。最后,仿真和实验结果表明,所提测控方法对LC-STATCOM实现有效控制。

The sub-modules in the conventional cascaded H-bridge static synchronous compensator(STATCOM)chains are equipped with large-capacity voltage-stabilizing capacitors and voltage sensors,resulting in higher equipment hardware and maintenance costs.This paper considers solving this problem from saving voltage sensor and reducing capacitance value,an adaptive measurement and control method of low capacitance(LC)STATCOM without DC voltage sensor is proposed.Firstly,the influence of the zero-sequence voltage on LC-STATCOM cluster voltage is analyzed,and two cluster voltage control modes are proposed accordingly,which improves the control effect of the capacitor voltage.Then,regarding the problem of errors in the conventional DC sensorless capacitor voltage detection,an adaptive capacitor voltage detection method suitable for LC-STATCOM cluster voltage control is constructed,which avoids the special mode that affects the detection results.Finally,the simulation and experimental results show that the proposed measurement and control method can realize the effective control of LC-STATCOM.