风电功率波动引发的强迫振荡扰动源定位方法

Localizing Disturbance Source of Power System Forced Oscillation Caused by Wind Power Fluctuation

电力系统中的强迫功率振荡有可能引发大范围的功率波动。风电等新能源接入电网时,其输出功率的波动具有随机性,当该功率波动导致系统中发生强迫振荡时,振荡同样会呈现随机特征,难以对扰动源进行定位。文中提出一种对风电引发的强迫振荡扰动源定位的方法,该方法利用振荡的双谱获取中心频率,并通过小波变换得到振荡中心频率处的初始相位,据此可通过能量函数对扰动源进行定位。实际算例验证了所提方法的可行性及有效性。

Forced power oscillations in the power system are likely to trigger a wide range of power fluctuations. When new energy such as wind power is connected to the power grid,the fluctuation of output power is random. When the power fluctuation causes the forced oscillation in the system,the oscillation will also show random characteristics and it is difficult to locate the disturbance source. Therefore,a method of locating forced oscillation disturbance source caused by wind farm is proposed. The method uses the oscillation bispectrum to obtain the center frequency and obtains the initial phase at the oscillation center frequency by wavelet transform. According to this,the disturbance source can be located by the energy function. The actual example verifies the feasibility and effectiveness of the proposed method.