Coordinated control strategy for improving the two drops of the wind storage combined system

2018 2nd International Workshop on Renewable Energy and Development

能源学;经济学

Qian, Zhou^1 ; Chenggen, Wang^1 ; Jing, Bu^2

Power Grid Technology Department, State Grid Jiangsu Electric Power Company Research Institute, Nanjing

211100, China^1

School of Automation, Nanjing University of Science and Technology, Nanjing

210094, China^2

关键词: Coordinated control strategy;    Doubly-fed wind power generations;    Energy storage systems;    Large-scale wind power;    Linear relationships;    Modulation strategy;    Operating frequency;    Power fluctuations;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/153/2/022041/pdf
DOI  :  10.1088/1755-1315/153/2/022041

来源: IOP

【 摘 要 】

In the power system with high permeability wind power, due to wind power fluctuation, the operation of large-scale wind power grid connected to the system brings challenges to the frequency stability of the system. When the doubly fed wind power generation unit does not reserve spare capacity to participate in the system frequency regulation, the system frequency will produce two drops in different degrees when the wind power exits frequency modulation and enters the speed recovery stage. To solve this problem, based on the complementary advantages of wind turbines and energy storage systems in power transmission and frequency modulation, a wind storage combined frequency modulation strategy based on sectional control is proposed in this paper. Based on the TOP wind power frequency modulation strategy, the wind power output reference value is determined according to the linear relationship between the output and the speed of the wind turbine, and the auxiliary wind power load reduction is controlled when the wind power exits frequency modulation into the speed recovery stage, so that the wind turbine is recovered to run at the optimal speed. Then, according to the system frequency and the wind turbine operation state, set the energy storage system frequency modulation output. Energy storage output active support is triggered during wind speed recovery. And then when the system frequency to return to the normal operating frequency range, reduce energy storage output or to exit frequency modulation. The simulation results verify the effectiveness of the proposed method.