多机电力系统变增益反演自适应L_2鲁棒分散励磁控制

Variable gain back-stepping adaptive L_2 robust decentralized excitation control for multi-machine power system

为提高多机励磁系统多输入、模型不确定、外部干扰条件下的鲁棒稳定能力,提出一种变增益反演自适应L_2鲁棒分散励磁控制(variable gain back-stepping adaptive L_2 robust decentralized excitation control,VGBADEC-L_2)方法,实现多机电力系统的分散励磁稳定控制和不确定参数自适应。3机励磁系统仿真测试结果表明:相对于固定增益控制方式,采用VGBADEC-L_2后,在短时接地故障状态下,端电压稳定时间由1.6 s减小为0.7 s,输电线功率波动次数由4次减少为2次;在负载突变状态下,端电压稳定时间由1.5 s减小为0.5 s,输电线功率波动由2次减少为1次,励磁幅值由3倍增加至5倍,电力系统的稳定控制能力得到提高。

In order to improve the robust stabilization ability of the multi-machine excitation system under multi-input, uncertain mathematical model and external disturbance conditions, a method of variable gain backstepping adaptive L2 robust decentralized excitation control（VGBADEC-L2） is proposed, which realizes decentralized excitation stability control and uncertain parameters self-adaption. Simulation results of the threemachine excitation system show that, the stabilization time of the terminal voltage is reduced from 1.6 s to0.7 s, and the tie-line power fluctuation is decreased from 4 times to 2 times by comparing with the traditional fixed-gain control method, under short-time grounding fault conditions after adopting the VGBADEC-L2;under load sudden change conditions, the stabilization time of the terminal voltage is reduced from 1.5 s to0.5 s, the tie-line power fluctuation is decreased from 2 times to 1 time, and the excitation amplitude is improved from 3 times to 5 times, which improves the stabilization control ability of the power system.