Small signal stability analysis of microgrid droop controlled power allocation loop
First, the principle of the droop control and the power calculation method is introduced. In order to overcome the disadvantage of big droop coefficients on the stability of the power allocation loop, here a feed forward path on the real power droop block is added to improve the stability. Then the small signal model of the microgrid is established, the impacts of droop coefficients, line resistance and reactance, filter and feed forward coefficients' on the stability is systematically analyzed, which confirms that the feed forward path can improve the stability significantly, so the power allocation loop can adopt big droop coefficients to lower its sensitivity on the fluctuation of the frequency and voltage of the distribution network, as well as improve the reactive load distribution accuracy. At last, the time domain simulation is conducted to confirm the necessity of adopting appropriate feed forward coefficients to configurate the dominant conjugate eigenvalue of small signal model.
microgriddroop controlpower calculation methodsmall signal modelstability analysis
国家科技期刊平台
NSTL
万方数据
维普
