电力系统强迫功率扰动源波形与大小估计

摘要

The waveform and magnitude of forced power disturbance source have important influence on the stability of power system.Based on the system's original equation of state,a virtual disturbance is introduced to represent the actu?al disturbance in the system,and a disturbance observer is constructed accordingly.The output of the disturbance ob?server is compared with the real output of the system to form a residual error,which is solved by an iterative algorithm, thus an accurate estimation of the system disturbance is realized.On this basis,the influences of different characteris?tics of disturbance sources on the system stability are studied.Finally,the validity of the proposed method is verified by time domain simulation. It is concluded that the constructed observer can estimate both the forced power disturbance source and the system state.Compared with the regular disturbance source,the random disturbance source is more like?ly to cause system instability.%强迫功率扰动源波形与大小对电力系统稳定性有重要影响.在电力系统原状态方程基础上,引入一个用以代表系统中实际发生扰动的虚拟扰动,以此构建扰动观测器.通过扰动观测器的输出与系统真实输出进行比较,形成残差,采用迭代算法进行求解,从而实现对系统扰动的准确估计.在此基础上,研究了不同扰动源特性对系统稳定性的影响.最后,通过时域仿真对该方法的有效性进行了验证.结果表明,该观测器能够同时实现对强迫功率扰动源和系统状态估计,随机扰动源相比规则扰动源更易引起系统的不稳定.