一种同步时标可自由设定的新型相量测量装置

提出一种同步时标可自由设定的新型广域电网相量测量装置（PMU），它由频率自适应等间隔采样模块、同步时标形成模块和核心微处理器模块等构成。通过硬件电路与计算软件的合理分工与协调配合，实现了相量同步测量装置中“时间同步”与“频率同步”的解耦处理，从而装置能够根据自由设定的同步时标与时标同步方式，自动定位截取整周期采样数据（无频谱泄漏）进行高精度离散傅里叶变换（DFT）相量计算，并通过简单的方法对截取DFT数据窗时造成的时标同步偏移量进而计算相量的相角偏差量进行高精度线性修正。同时对同步时标位于DFT数据窗首、中、末点3种情况下的相量测量精度进行了仿真研究，得出了“中点同步”精度最高的正确结论。

A Novel Phasor Measurement Unit with Free Scaled Synchronized Time-mark

A novel phasor measurement unit (PMU) with free scaled synchronized time-mark has been developed. The novel PMU is composed of frequency auto-adapted equal interval sampling module, synchronized time-mark generating module, microprocessor core module, and capable of resolving the problem of uncoupling treatment to "time-synchronized" and "frequency-synchronized" sampling. With helps of the synchronized time-mark and its synchronization model set freely, the full circle sampling data can be automatically orientated and intercepted (no frequency spectrum leak out) to make high precision DFT calculation. The phasor calculation offset caused by synchronized time-mark offset can be precisely corrected with simple linear method. The precision of phasor measurement under three time-mark points (the first, middle and last sampling point) of time-mark synchronization has also been simulated, and the best time-mark synchronization point be "the middle sampling point" is verified.