基于dq变换的三相自适应锁相环技术

Three-phase Adaptive Phase-locked Loop Based on dq Transformation

针对基于dq变换的传统三相锁相环技术在电网扰动情况下不能准确获取相位的问题,提出了一种基于dq变换的三相自适应锁相环,通过一个自适应环节检测出锁相环三相输入电压信号的基波分量,并将基波分量送给dq变换锁相环以检测出电压的相位.同传统锁相环相比,所提的自适应dq锁相环能在电网电压暂降、电压不平衡、频率跳变、相位跳变以及含有较高谐波的情况下更精确地检测出电压相位.仿真结果表明,该自适应dq锁相环在检测精度和稳定性等方面都优于传统dq锁相环.

Due to the problem that the traditional PLL cannot detect the voltage phase accurately when the system voltage is disturbed,a novel three phase adaptive PLL（TPAPLL） based on dq transformation is proposed.An adaptive unit is introduced to detect the fundamental component of the three phase voltages.Compared with the traditional PLL,the proposed TPAPLL can detect the voltage phase more accurately under the conditions of voltage sag,voltage swell,voltage unbalance frequency and phase jump and high voltage harmonics.The simulation results prove that the three phase adaptive phase locked loop has a better stability and accuracy than the traditional PLL.