电力系统实时相位同步方法的研究和比较

本文较全面地综述了过零点检测、锁相环、加权最小均方差估计和变换角检测等常用的相位同步方法及其改进型的工作原理、理论成果和应用情况.同时分析、比较了噪音、谐波、频率波动和三相不平衡等电能质量扰动对上述较为普遍使用的相位同步方法检测精度的影响,确定了各种相位同步方法的优、缺点和适用范围.最后结合分布式发电和相量测量单元等新技术的出现提出了一些关于相位同步方法的值得深入讨论的问题.

Comparison and study on real-time phase synchronization methods

The fundamental principles,achievements of theoretical study and application situation of several synchronization method such as zero-crossing points detection method,phase-locked loop(PLL),the weighted least-squares estimation method(WLSE) and the zero-crossing digital phase-locked loop(ZCPLL) is summarized in detail.Noises,harmonics,frequency variations and network unbalance are the main power quality disturbances that effect the precision of phase synchronization.The paper gave out the advantages and disadvantages of each synchronization method combined with above different disturbances.All these provided the convenience for user to choose the appropriate synchronization method for practical applications.Finally some problems which are worth in-depth exploring are put forward about real-time phase synchronization with the development of distributed generation(DG) and phasor measurement unit(PMU) technology.