电力系统保护与控制
電力繫統保護與控製
전력계통보호여공제
POWER SYSTM PROTECTION AND CONTROL
2013年
5期
140-145
,共6页
广域测量系统%PMU信号%归一化峰度%电网扰动信号%在线检测
廣域測量繫統%PMU信號%歸一化峰度%電網擾動信號%在線檢測
엄역측량계통%PMU신호%귀일화봉도%전망우동신호%재선검측
wide area measurement system%PMU signal%normalization kurtosis%disturbance signal of power grid%on-line detecting
为保证电网的安全可靠运行,调度运行人员需要及时掌握电网中的扰动情况.基于PMU信号的归一化峰度和滑动窗技术,提出一种电网扰动信号在线检测方法.对不同类型PMU信号的概率分布特性进行测试后得到结论:稳态信号、动态信号的归一化峰度大约为3,稳态和动态混合信号的归一化峰度远远大于3.依据滑动窗技术,实时更新滑动窗内PMU信号,在线计算滑动窗内标准化PMU信号的归一化峰度,与扰动阈值比较,判断是否存在扰动信号.通过对IEEE-39节点系统时域仿真信号和电网实测信号的分析,验证了该方法具有普遍适用、计算量小、准确有效等优点,具有较高的实际应用价值.
為保證電網的安全可靠運行,調度運行人員需要及時掌握電網中的擾動情況.基于PMU信號的歸一化峰度和滑動窗技術,提齣一種電網擾動信號在線檢測方法.對不同類型PMU信號的概率分佈特性進行測試後得到結論:穩態信號、動態信號的歸一化峰度大約為3,穩態和動態混閤信號的歸一化峰度遠遠大于3.依據滑動窗技術,實時更新滑動窗內PMU信號,在線計算滑動窗內標準化PMU信號的歸一化峰度,與擾動閾值比較,判斷是否存在擾動信號.通過對IEEE-39節點繫統時域倣真信號和電網實測信號的分析,驗證瞭該方法具有普遍適用、計算量小、準確有效等優點,具有較高的實際應用價值.
위보증전망적안전가고운행,조도운행인원수요급시장악전망중적우동정황.기우PMU신호적귀일화봉도화활동창기술,제출일충전망우동신호재선검측방법.대불동류형PMU신호적개솔분포특성진행측시후득도결론:은태신호、동태신호적귀일화봉도대약위3,은태화동태혼합신호적귀일화봉도원원대우3.의거활동창기술,실시경신활동창내PMU신호,재선계산활동창내표준화PMU신호적귀일화봉도,여우동역치비교,판단시부존재우동신호.통과대IEEE-39절점계통시역방진신호화전망실측신호적분석,험증료해방법구유보편괄용、계산량소、준학유효등우점,구유교고적실제응용개치.
In order to guarantee the safe and reliable operation, the dispatchers and controllers should be aware of disturbance generated from power grid. A method for on-line detecting disturbance signal of power grid, based on normalization kurtosis from PMU signal and sliding window, is presented. The probability distribution characteristics of different PMU signals are analyzed, the test results show that when the normalization kurtosis of ambient or ringdown signal is approximately 3, but the normalization kurtosis of mixed-signal which contains the two kinds of signal is much bigger than 3. This method calculates the normalization kurtosis of the standardization PMU signal, which is updated real time by the sliding window, and compares the result with the disturbance threshold, then determines whether the ringdown signal exists in the sliding window or not. By means of analyzing simulation from IEEE-39 bus power system and measured signal of power grid, it is found that the method has characteristics of generality, less calculation, accuracy and availability, and possesses a relatively high practical value.
