摘要
Abstract
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.关键词
广域测量系统/PMU信号/归一化峰度/电网扰动信号/在线检测Key words
wide area measurement system/PMU signal/normalization kurtosis/disturbance signal of power grid/on-line detecting分类
信息技术与安全科学
