dq变换用于电压暂降瞬时检测的合理性分析

Rationality analysis of dq transform applied for instantaneous detection of voltage dip

基于dq变换的电压暂降检测方法具有良好的动态性能,因此适用于电压暂降的瞬时测量与实时补偿,在动态电压调节器等电力调节装置中应用广泛。关于dq变换能否瞬时检测电压暂降的特征量,国内的一些学者和电力工作者对此存在质疑。本文详细推导了基于dq变换的电压暂降检测方法的原理,并对其特性进行了分析,以解释该方法的合理性,最后利用PSCAD进行了仿真验证。

Voltage dip detection method based on dq transform can detect dip amplitude and phase transition quick- ly and it has a good dynamic performance, therefore, it is applicable to instantaneous measurement and real-time compensation for voltage dip, and is widely applied in power conditioning devices such as dynamic voltage regula- tor. However, some domestic scholars and electric power professionals question whether the method based on dq transform can detect the characteristic parameters of voltage dip. Firstly, this paper deduce the principle of the dq transform detection method, and then makes a detailed analysis of its characteristics, which reveals that the method is reasonable. Finally, it is verified by PSCAD simulation. The analysis and simulation results show that voltage dip detection method based on dq transform is just a quasi-instantaneous metlwd, but it still meets the requirement of real-time detection and compensation applications. In practical applications, the design of phase-locked loop and filter is very important because it has a great effect on dynamic performance and detection accuracy.