孤岛下微网小信号稳定分析

Small-Signal Stability Analysis for the Microgrid in Stand-Alone System

详细的推导了孤岛下微网的微源和微网整体在稳定点线性化的小信号模型,对于微源,考虑功率模块中的频率和电压的下垂控制,因功率变化带来的频率和电压的调整,而线性的网络,考虑扰动对其节点电压影响,将频率和电压作为状态量得出孤岛下整体微网的小信号模型。对建立的小信号模型,一方面通过计算求取模型的系数矩阵的特征值来判断该微网的稳定性;另一方面通过Matlab/simulink搭建微网模型得到频率电压的时域仿真图判断该微网的稳定性;比较以上两种方法的结论得到本文的小信号模型合理性。给相关方面的研究以借鉴。

This paper establishes detailly the small-signal model for microsource and the whole microgrid in the stand-a- lone system;For the microsoure, the paper researches frequency and voltage droops in the power control module, which depends on the local variable measurements. For the network, the paper researches node voltage. In the small-signal mod- el, the state quantities are frequency and voltage. With the model, for one thing, the paper calculates the eigenvalue of co- efficient matrix to judge the stability of the microgrid ; for another, the paper builds the microgrid simulation model in the Matlab/simulink to judge the stability of the microgrid. The conclusion is that the small-signal model is right compared the above two results. The results can use in related research.