端电压及功角双重稳定约束鲁棒自适应励磁控制
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摘要
为实现励磁系统非线性控制的端电压和功角双重稳定约束,基于非线性坐标变换方法,构建励磁系统非线性等价系统模型,采用鲁棒自适应设计方法实现Lyapunov函数构建、参数自适应估计和等价系统耗散稳定控制。在输出功率增加和三相接地故障状态下,对新的励磁控制方法进行仿真测试和分析。仿真结果表明:相对于传统反演鲁棒励磁控制方法,状态变量波动次数减少50%,端电压和功角稳定时间由0.2 s缩短为0.1 s,端电压始终保持为额定电压,没有出现电压偏移问题,不确定参数能够在0.05 s内完成估测。研究成果对于提高励磁系统暂态稳定能力和端电压恒定控制精度具有一定意义。
In order to realize the terminal voltage and power angle stabilization control of the excitation system,the nonlinear equivalent model of excitation system is established based on the nonlinear coordinated transformation. The design of the Lyapunov function, the adaptive estimation of the uncertain parameter and the stabilization dissipation control of the equivalent system are realized by the robust adaptive method. In the output power increasing and three-phase ground fault condition, the new excitation control method is simulated and analysed. Simulation results show, comparing with the traditional back-stepping robust excitation control method, state variables fluctuation times decreased by 50%, the terminal voltage stabilization time reduced from 0.2 sec to 0.1 sec, the terminal voltage kept to be rated value and the voltage deviation isn't appeared, the uncertain parameter estimated in 0.05 second. The research results are important for the improving the excitation system transient ability and guaranteeing the constant of the terminal voltage.
In order to realize the terminal voltage and power angle stabilization control of the excitation system,the nonlinear equivalent model of excitation system is established based on the nonlinear coordinated transformation. The design of the Lyapunov function, the adaptive estimation of the uncertain parameter and the stabilization dissipation control of the equivalent system are realized by the robust adaptive method. In the output power increasing and three-phase ground fault condition, the new excitation control method is simulated and analysed. Simulation results show, comparing with the traditional back-stepping robust excitation control method, state variables fluctuation times decreased by 50%, the terminal voltage stabilization time reduced from 0.2 sec to 0.1 sec, the terminal voltage kept to be rated value and the voltage deviation isn't appeared, the uncertain parameter estimated in 0.05 second. The research results are important for the improving the excitation system transient ability and guaranteeing the constant of the terminal voltage.
引文
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[2]谷志锋,朱长青,邵天章,等.含K类函数和附加控制量的自适应L2励磁控制[J].控制理论与应用,2016,33(2):257-264.
[3]梅生伟,申铁龙,刘康志.现代鲁棒控制理论与应用[M].北京:清华大学出版社,2008:172-184.
[4]纪历,邵宜祥,高苏杰,等.可变速抽水蓄能机组交流励磁系统自抗扰控制[J].电力系统自动化,2017,41(13):162-166.
[5]刘向杰,韩耀振.基于连续高阶模滑的多机电力系统励磁控制[J].山东大学学报,2016,46(2):64-71.
[6]陈胜泉,孙丽颖.带干扰的切换双机电力系统鲁棒控制器设计[J].辽宁工业大学学报(自然科学版),2017,37(1):6-10.
[7]肖健梅,张科,王锡淮.基于预测函数与线性多变量反馈控制的同步发电机励磁控制[J].电力自动化设备,2015,35(7):153-159.
[8]陈文韬,王杰.基于伪广义Hamilton理论的电力系统时滞反馈励磁控制[J].电网技术,2015,39(8):2238-2244.
[9]关琳燕,周洪,胡文山.基于Hamilton理论的广域非线性时滞多机电力系统的稳定与控制[J].电力系统保护与控制,2016,44(19):17-24.
[10]李啸骢,袁辉,陈明媛,等.多机系统中STATCOM与发电机励磁的非线性分散协调控制设计[J].电网技术,2016,40(8):2350-2356.
[11]栾某德,陆巍,刘涤尘,等.基于扰动跟踪Terminal滑模与多目标零动态的协调励磁控制器设计[J].电力系统保护与控制,2015,43(4):126-135.
[12]常鲜戎,张海生,崔赵俊.基于微分几何和扩张状态观测器的励磁控制[J].电力系统及其自动化学报,2015,27(8):87-91.
[13]阮阳,袁荣湘.多机电力系统广域非线性鲁棒电压控制策略[J].中国科学:技术科学,2012,42(5):565-575.