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本文通过对含UPFC的单机无穷大系统中一些关系式的研究，建立了基于不同状态量的状态方程，并据此设计出了其最优控制系统。通过对某单机无穷大系统的暂态仿真，验证了所设计的控制系统能有效地提高系统的稳定性。
In this paper, some relations among UPFC-based single-machine infinite systems are studied, and state equations based on different state quantities are established, and their optimal control systems are designed accordingly. Through the transient simulation of a single machine infinite system, it is verified that the designed control system can effectively improve the stability of the system.