摘要
研究了能够减小系统频率偏移影响的相量算法,提出了一种基于母线电压的失步振荡识别方法和一种失步中心快速定位的新方法。所提定位方法依靠广域测量系统上传的3组电压、电流数据,在系统两侧电势幅值不等和全系统阻抗角不同同时存在的场景下,通过求解测量阻抗轨迹方程与全系统阻抗折线方程的交点,能够在失步振荡发生后而两侧电势相角差未达到180°时定位失步中心所在元件,并利用实时测量数据与理论计算值存在的关系确定失步中心出现的时刻,从而为复杂电力系统失步解列断面的确定和解列时刻的选择提供依据。仿真结果验证了所提方法的有效性。
A phasor algorithm which can reduce the effect of system frequency deviation is studied. An out-of-step oscillation identification method based on bus voltage and a new fast out-of-step center locating method are proposed. In the scene that both the voltage amplitude of the two sides of the system is different and the whole system impe- dance angle is different, the proposed methods can locate the component where the out-of-step center belongs to when the out-of-step oscillation occurs and the phase difference of the two sides of the system is not up to 180~ ,by solving the intersection of measured impedance trajectory equation and the whole system impedance poly line equa- tion, according to three groups of voltage and current data uploaded by wide area measurement system. The appearing time of out-of-step center is determined by the relationship between real-time measured data and the theoretical cal- culative value, so as to provide the basis for the determination of the out-of-step separation section and the selection of separation time for complex power system. Simulative results verify the effectiveness of the proposed methods.
作者
张艳霞
李杰
张帅
李多多
尹佳鑫
ZHANG Yanxia, LI Jie, ZHANG Shuai, LI Duoduo, YIN Jiaxin(Key Laboratory of Smart Grid of Ministry of Education ,Tianjin University,Tianjin 300072, Chin)
出处
《电力自动化设备》
EI
CSCD
北大核心
2018年第4期1-8,共8页
Electric Power Automation Equipment
关键词
失步解列
频率偏移
相量算法
广域测量
失步振荡识别
失步中心定位
out-of-step separation
frequency deviation
phasor algorithm
wide area measurement
out-of-step oscilla- tion identification
out-of-step center locating
