适用于闭环控制的快速相量计算方法

近年来,大量电力电子设备在电力系统电源、电网与负荷侧广泛应用,导致电力系统跨区域、跨电压等级的系统性连锁故障逐渐增多,亟需精细化闭环控制。这要求同步相量测量装置(SynchrophasorMeasurementUnits,PMUs)在保证测量精度的同时,具有快速的响应速度。针对这一问题,提出了一种适用于闭环控制的快速相量测量方法。该方法分析了传统DFT算法在系统动态条件下的测量误差特性,揭示了时标位置对相量测量精度与上传延时的影响。为减少PMU上传延时,研究了将时标打在时间窗尾部时相量测量误差与动态相量模型参数的规律,提出了相量修正方法,在减少上传延时的同时兼顾了测量精度。仿真测试验证了所提方法的测量精度与上传延时远高于PMU标准对保护控制类PMU的要求,可用于复杂电力系统闭环控制应用。

A fast phasor measurement method for closed-loop control

With the development of power electronic equipment in power, grid and load side, the systemic cascading failures across the voltage and region is increasing. The closed-loop control is needed. This requires Synchrophasor Measurement Units (PMUs) to measure phasors accurately and quickly. In this paper, a fast phasor measurement method for closed-loop control is proposed. The measurement error characteristic of traditional DFT under dynamic condition is revealed, and the influence of time mark position on accuracy and reporting latency is analyzed. The behavior of phasor measurement error and dynamic phasor model parameter with time mark at tail of window is analyzed. And the phasor modification method is proposed to reduce the reporting latency and ensure the accuracy. Simulation test verifies that the measurement accuracy and reporting latency is far exceed the standards of PMU for protection and control. It can be used for close-loop control. This work is supported by National Key Research and Development Program of China (No. 2017YFB0902901) and National Natural Science Foundation of China (No. 51627811, No. 51725702 and No. 51707064).