高渗透率分布式风储系统参与电网频率调节的分层协调控制

Hierarchical Control on Frequency Regulation of High Permeability Distributed Wind Storage System

风电渗透率日益提高,风能的功率波动和发电机的有功-频率弱惯性将对电网的频率带来挑战。基于分布式风储系统,提出一种分层协调控制策略,上层中心控制器实时检测风速、转子转速和电网频率,实现在不同状态下,系统运行模式切换和底层控制器的选择。底层控制器包括风电MPPT控制和储能功率控制。在风电功率波动方面,利用储能辅助风电系统并网,使得风储系统输出功率平滑;在频率调节方面,综合考虑风速与储能配置,在低频时,将风电的转子惯性控制和储能充放电功率控制相结合,在高频时,将储能与风力机变桨控制结合,参与电网频率调节。本文建立了风储仿真系统,仿真结果验证了所提策略的正确性与有效性。

With the increase of wind power penetration, the fluctuation of wind power and the weak inertia of variable speed wind generation system will bring challenges to the power system frequency stabilization. To solve the above problems, based on distributed wind-energy storage system, this paper proposes a hierarchical control strategy. A central controller can detect the wind speed, the rotor speed and the grid frequency in real time and realize the switching of the system mode and the selection of the bottom controller in different running states. The bottom controller includes wind power MPPT control and energy storage power control. In the aspect of wind power fluctuation, the energy storage system can help the wind generation system to connect to the power grid, which can make the wind-storage system output power smoothing;in frequency regulation aspect, considering wind speed and energy storage configuration, in low frequency, combining inertia control;at high frequency, the energy storage is combined with the wind turbine pitch control to participate in the power grid frequency regulation. In this paper, the simulation system is established, the simulation results verify the correctness and effectiveness of the proposed control strategy.