基于PSS/E的功率振荡增量分布计算

Calculation of Oscillatory Active Power Increment Distribution Based on PSS/E

介绍了基于PSS/E的功率振荡增量分布的理论计算方法,提出将复频域法与时域辨识法结合起来,以获得功率振荡增量在全网中的分布。首先用经典模型表示发电机,通过PSS/E软件计算振型、频率与参与因子,根据参与因子确定施加扰动的机组;然后将发电机用详细模型表示并考虑励磁系统,借助时域辨识获得功率振荡增量分布。通过对典型的4机2区域系统以及新英格兰系统的仿真,比较了理论计算方法与新方法的结果,证明了新方法的有效性。最后计算了华东电网某个区域间振荡模式的功率振荡增量分布情况。

A theoretical calculation method of oscillatory active power increment distribution based on PSS/E is presented and it is proposed to combine complex frequency domain method with time domain identification to obtain the distribution of active power increment in power system. First, the generators are represented by classical model and the mode shape, frequency and participating factors are calculated by PSS/E, and according to the participating factors the unit to be applied perturbation is determined; then the generators are represented by detailed model and the excitation systems are taken into account, the distribution of oscillatory active power increment can be obtained by time domain identification. By means of the simulation of 4-machine 2-area system and New England system, the results from theoretical method and that from the proposed method are compared, thus the effectiveness of the proposed method is proved. Finally, an inter-area mode of the Eastern China Power Grid is analyzed and its oscillatory active power increment distribution is obtained.