电力系统强迫振荡源定位的耗散能量谱方法

Forced Oscillation Source Location in Power System Using Dissipation Energy Spectrum

快速、准确定位振荡源是抑制电力系统强迫功率振荡的关键。为提高电力系统强迫振荡源定位精度和效率,该文提出一种基于耗散能量谱的电力系统强迫振荡源频域定位方法。该方法首先将电力系统广域测量信息进行短时傅里叶变换(short-time Fourier transform,STFT);然后,根据信号的时—频域特性,推导出时域耗散能量与时频域耗散能量间的关系,在此基础上,构建出频域耗散能量谱,论证了时域耗散能量与频域耗散能量谱的等价性;进而根据频域耗散能量谱辨识系统强迫振荡频率、定位强迫振荡源;最后,将所提方法应用到WECC179节点测试系统和ISO New England中进行仿真、验证,结果验证了所提方法的准确性和有效性。

Accurate and fast locating of the forced oscillation source plays a key role in suppressing the forced power oscillation of the bulk power system.To improve the efficiency and accuracy of the forced oscillation source location,based on the theory of time-domain dissipated energy flow,this paper proposes a dissipated energy spectrum(DES)based forced oscillation source location method,deriving from the dissipated energy flow(DEF).The short-time Fourier transform(STFT)is carried out with the measurement responses to obtain the representations of the measurement responses in frequency domain.Then,the relationship between the time-domain DEF and the time-frequency-domain DEF of the measurement response is derived,and the DES of the measurement response is hereby defined.Using the defined DES,the forced oscillation frequency is estimated and the forced oscillation source is located.Finally,the proposed DES method is evaluated by using the simulation data of WECC179-bus test system as well as the field-measurement data of ISO New England.The results confirm that the proposed DES method has high accuracy and efficiency in the forced oscillation source location by using the measurements.