Power System Transient Stability Enhancement Using SMC Controller under High Wind Power Penetration Scenarios

With the blooming development of wind power technology, wind power generation contributes more and more to the global electricity generation mix. This paper focuses on the transient stability issue brought by this inevitable structural change in electricity generation. Renewable energy sources such as wind power are connected to the power grid through power electronic interfaces. As a consequence, wind power turbines are usually decoupled from the power grid in terms of rotating frequency and inertia, in another word, considered as inertia-less generation units. Obviously, it is important to design better controllers to enhance transient stability while more proportion of inertia-less wind power generation is integrated. This paper presents a new controller based on Sliding Mode Control (SMC) to improve the power system transient stability, especially in high wind power ratio scenarios. It utilizes both advantages from SMC and the unique characteristics of wind power generation. The proposed controller performance is verified via a modified WSCC 3-machine 9-bus complex power system with PMSG based wind turbines. The simulation result shows the effectiveness and robustness of the proposed method.