基于频率校正的无锁相环αβ-dq变换电压暂降检测方法  

Voltage Sag Detection Method based on No PLL αβ-dq Transform with Frequency Correcting

作　　者：曹玲芝[1] 李振杰[1] 

机构地区：[1]郑州轻工业学院,郑州450002

出　　处：《电气技术》2016年第7期57-61,共5页Electrical Engineering

摘　　要：常规的基于αβ-dq变换的电压暂降检测方法需要使用锁相环,但锁相环本身易受电压波动、电压畸变等因素影响,而且锁相环电路调试麻烦,而去掉锁相环后采用预置αβ-dq变换矩阵频率的方法获得的电压相位又会随着电网频率的偏移而随时间变化。针对此问题,提出了一种基于频率校正的无锁相环αβ-dq变换电压暂降检测方法。该方法在αβ-dq变换过程中通过相位的变化来获取当前电压的基波频率,使无锁相环αβ-dq变换在电网频率发生偏移的情况下也能对电压暂降参数特别是电压相位进行准确检测。最后利用Matlab/Simulink对所提方法在电压暂降检测中的应用进行了仿真,仿真结果验证了该方法的正确性和有效性。The conventional voltage sag detection method based on the αβ-dq transformation needs to use the PLL（phase lock loop）, but the PLL is easily affected by voltage fluctuation, voltage distortion and other factors, and is also difficult to debug. The phase which is obtained from the method of presetting the frequency of the αβ-dq matrix changes with the time when removing the PPL. For this problem, the method of voltage sag detection based on no PLL αβ-dq transformation with frequency correcting is put forward. With the method, we can acquire the fundamental frequency of the current voltage through the change of phase value during the process of the αβ-dq transformation, making the phase of the voltage can be detected accurately by the method based on αβ-dq transformation without PPL when the frequency of the power grid fluctuating. Finally the presented method applied in voltage sag detection is simulated by Matlab/Simulink software, the simulation results verify the correctness and validity of the method.

关 键 词：电能质量 电压暂降 αβ-dq坐标变换 数学形态学 

分 类 号：TM714.2[电气工程—电力系统及自动化]