Research on the Accommodation Capacity of Renewable Energy in Power System Based on Holomorphic Embedding Method

Renewable energy and other power electronics have access to the power grid broadly, accompanied by the decline of the voltage supportability of the power grid. Aiming at the restriction of voltage problem on the renewable energy accommodation capacity of the power grid, a practical numerical computation technique of renewable energy accommodation capacity in view of holomorphic embedding method is recommended in this paper. Firstly, the holomorphic embedding model considering different power change directions is proposed. And the voltage function is analytically extended by Pade approximant. Then, considering the uncertain characteristics of wind power, the holomorphic embedding method is available on application to the computation of renewable energy accommodation capacity. From the perspective of voltage violation, the probabilistic evaluation of wind power accommodation capacity is performed. The whole process takes the holomorphic embedding model as the core. Compared with the traditional method, it is unnecessary to have a complete Newton iterative process in each step of state deduction, and the computing velocity increases. Finally, simulation results verify the proposed method.