Abstract：Static var compensator (SVC) is one of the approaches recommended to suppress sub-synchronous oscillations (SSO). Existing control strategies of SVC for suppressing SSO generally fail to accommodate to the nonlinearity of power system. Thus, this paper proposes a practical nonlinear SVC controller design method. Firstly, the generator shaft model is decoupled. Secondly, a reasonable objective function is selected according to the damping effect, and then the theoretical derivation of the control strategy for SVC is proposed. The control scheme is verified mathematically, and the proposed nonlinear controller is verified through a time-domain simulation. Compared with traditional PI control schemes, the proposed method can achieve better suppression of SSO, maintaining the safety of generator shaft system.
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