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Integrated Linear and Nonlinear Control of Unified Power Flow Controllers for Enhancing Power System Stability

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This paper presents an integrated linear and nonlinear control for a unified power flow controller (UPFC). Three Pulse-Width Modulation (PWM) parameters of the UPFC are controlled by Proportional-Integral-Differential (PID) laws, and an analytic expression of the nonlinear control law for the UPFC phase angle 2 is obtained by a feedback linearization method. This combined linear and nonlinear control strategy enables the UPFC to improve power system transient stability and dynamic performance effectively. Simulation results illustrate the effectiveness of the developed control strategy.

Keywords: power system stability control; unified power flow controller (UPFC)

Document Type: Research Article


Affiliations: 1: Department of Electrical Engineering, Tsinghua University, Beijing, China 2: Brunel Institute of Power Systems, Brunel University, Uxbridge, Middlesex, UB8 3PH, U.K. 3: Deptartment of Electrical Engineering, University of Tokyo, Tokyo, Japan

Publication date: April 1, 2003

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