电压正序分量故障检测法的动态电压补偿器设计

Design of Dynamic Voltage Restorer Based on Fault Detection Method of Positive Sequence Voltage Component

针对如何提高电压暂降检测信号快速性、准确性的问题,提出电压正序分量故障检测方法。首先,在单相电压构造的三相系统中,为抑制谐波对检测信号精度的影响,在仿真系统中引入电压正序分量环节,并加强对指定次数谐波的补偿作用,在动态电压补偿器的原有控制策略中增加谐波补偿控制;然后,根据所提控制器进行电压暂降信号的检测;最后,采用Matlab/Simulink工具搭建实际系统仿真模型。仿真结果证明该方法有效提高了检测信号的快速性和准确性,消除了系统中指定次数的谐波,改善了系统的电能质量。

To improve the rapidity and accuracy of detection signal of voltage sag,a fault detection method of positivesequence voltage component is proposed in this paper.First,in the three-phase system constructed by using singlephase voltage,positive-sequence voltage calculator is introduced into the simulation system to suppress the influence of harmonics on the accuracy of detection signals.In addition,to enhance the compensation effect on the specified orders of harmonics,harmonic compensation control is added into the original control strategy for the dynamic voltage compensator.Then,voltage sag signal can be detected using the proposed controller.Finally,a real system simulation model is established using Matlab/Simulink,and the results show that the proposed method can effectively improve the rapidity and accuracy of signal detection;and it not only eliminates the specified orders of harmonics in the system,but also improves the power quality.