适用于保护控制的同步相量测量方法

A Synchrophasor Measurement Method for Protection and Control

近年来,电力系统电力电子化特征导致输配电网动态特性耦合紧密,系统性故障频发。同步相量测量单元(PMU)在动态安全控制中作用愈发重要。适用于智能配电网的同步相量测量装置的研究也得到广泛开展。如何在当前复杂电气信号条件下保证相量测量精度的同时,缩短其阶跃条件下的响应时间对保护控制应用至关重要。文中提出一种适用于保护控制的同步相量测量方法。该方法揭示了阶跃信号对相量测量的影响机理,分析了相量模型参数在阶跃信号条件下的行为规律,提出了信号阶跃识别方法。进一步,揭示了阶跃量大小与动态相量模型参数突变量的线性关系,提出了阶跃过程中相量修正方法,减少了相量计算的响应时间。仿真与实际录波数据测试验证了所提方法可有效减少响应时间,为智能配电网保护控制提供快速准确的测量数据。

The high penetration of electronics has made the dynamic characteristics of transmission and distribution networks more coupling with each other,which leads to more systemic faults.Phasor measurement unit (PMU) plays a more and more important role in dynamic security control.Recently,the research of PMU for distribution network (D-PMU) is also carried out widely.It is of great significance to reduce the response time of step change and ensure the measurement accuracy of DPMU under complex signal conditions.In this paper,a synchrophasor measurement method for protection and control is proposed.The influence mechanism of step signal on phasor measurement is revealed,the behavior of phasor model parameter under step signal condition is analyzed,and a step signal identification method is proposed.And then,the relationship between step change value and dynamic phasor model parameter is revealed,the phasor of step modification method is proposed to reduce the response time.Simulation and site fault recording date test verify that the response time can be reduced by the proposed method which provides fast and accurate measurement data for smart distribution network to control.