基于灵敏度分析的同步发电机参数分步辨识策略

Step identification of synchronous generator parameters based on sensitivity analysis

分析得到各种扰动中各同步发电机参数会表现出不同的轨迹灵敏度和平均灵敏度特征,基于此提出一种同步发电机参数分步辨识策略,将发电机各参数的影响进行解耦分解,针对不同激励方式和状态,寻找各参数自身灵敏度最大的扰动模式进行辨识。进一步提出仅含下阶跃、脉冲和短路3种试验的简化辨识策略。仿真结果显示,所提策略能够较好地解决辨识参数较多和一些参数灵敏度较低所引起的辨识困难问题,尤其是瞬态和超瞬态参数辨识精度较低的情况,辨识结果优于传统发电机参数辨识方法。

Analysis indicates that different parameters of synchronous generator have different trajectory sensitivity and average sensitivity features in different disturbances, based on which, a step identification strategy of synchronous generator parameters is proposed. It decouples the impact of generator parameters and finds the best disturbance mode to identify the parameter which has the maximal sensitivity to it. A simplified step identification strategy is presented, which only involves 3 kinds of test: step-down, pulse and short circuit. The simulative results show that, better than the traditional parameter identification, the proposed strategy solves the problems existing in the multi-parameter identification and the identification of parameter with lower sensitivity, especially when the identification accuracy of transient and sub-transient parameters is low.