Robust decentralized nonlinear controller design for multimachine power systems
Robust decentralized nonlinear controller design for multimachine power systems
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DOI：
10.1016/s0005-1098(97)00091-5
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发表时间：
1997-09
期刊：
影响因子：
--
通讯作者：
Youyi Wang;G. Guo;D. Hill
中科院分区：
文献类型：
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作者：
Youyi Wang;G. Guo;D. Hill
针对多机电力系统暂态稳定问题，提出了一种鲁棒分散励磁控制方案。首先，设计了通过励磁回路的直接反馈线性化(DFL)补偿器，以消除多机电力系统的非线性和互联。然后，考虑被控对象参数不确定性和剩余非线性关联的影响，提出了一种保证DFL补偿系统渐近稳定的鲁棒分散控制器。N机电力系统的设计过程涉及求解n个Riccati方程。在设计鲁棒非线性分散控制器时，只需要知道发电机参数的界，而不需要知道输电网络参数、系统运行点或故障位置。由于所提出的鲁棒非线性分散控制器能够保证大系统在所有允许的参数下在整个运行区域内稳定，因此可以大大提高整个系统的暂态稳定性。该设计方法在一个三机算例电力系统上进行了验证。仿真结果表明，无论网络参数、工作点和故障位置如何，所提出的控制方案都能大大提高系统的暂态稳定性。
In this paper, a robust decentralized excitation control scheme is proposed for multimachine power system transient stability enhancement. First, a direct feedback linearization (DFL) compensator through the excitation loop is designed to eliminate the nonlinearities and interconnections of the multimachine power system. Then, a robust decentralized controller is proposed to guarantee the asymptotic stability of the DFL compensated system considering the effects of plant parametric uncertainties and remaining nonlinear interconnections. The design procedure for an n-machine power system involves in solving n Riccati equations. In the design of the robust nonlinear decentralized controller, only the bounds of generator parameters need to be known, but not the transmission network parameters, system operating points or the fault locations. Since the proposed robust nonlinear decentralized controller can guarantee the stability of the large scale power system within the whole operating region for all admissible parameters, transient stability of the overall system can be greatly enhanced. The design procedure is tested on a three-machine example power system. Simulation results show that the proposed control scheme can greatly enhance the transient stability of the system regardless of the network parameters, operating points and fault locations.