Abstract
The wide-area damping controller (WADC) is vital in suppressing wide-area oscillations. However, the power system is now developing very fast, traditional output-feedback linear matrix inequality (LMI) criteria adopted in this field may not be very applicable. This paper proposes an output-feedback H∞ robust criterion to design a WADC installed in the photovoltaic plant considering the wide-area signal delay. We use the auxiliary function technique, and adopt Lyapunov functions containing triple summation, augmented variables and cross terms to deduce a stability analysis criterion followed by the corresponding controller design criterion. The low conservatism and control performance of the proposed criteria are verified in a 68-bus 16-machine test system. In addition, as system parameters often change, the control performance of integrating the proposed controller design criterion into a gain scheduling algorithm to handle the system parameter variance is validated.
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