风电-储能-电动汽车联合调频控制策略研究

Research on control strategy of WG-ESS-PEV joint frequency modulation

随着可再生能源发电渗透率的升高,电网系统的频率响应能力不足。文章提出一种风电-储能-电动汽车联合调频的控制策略。该策略中风电机组通过虚拟惯性控制和桨距角控制参与系统频率调节;利用储能系统弥补风电场参与系统调频可能造成频率二次跌落的不足;在需求侧建立了电动汽车的充电负荷概率模型,考虑用户充电需求及系统调频需求,提出计及电动汽车集群响应的调频策略。最后,通过仿真算例验证了所提出的风电-储能-电动汽车联合调频控制策略的有效性。

With the rapid increase of the penetration rate of wind power,the proportion of installed synchronous machines has declined.Renewable energy units do not have the ability to adjust the frequency.The frequency response of Wind Generators(WG)is critical to the stable operation of the power system.Firstly,this paper builds the frequency response model of the joint system.The wind turbines participate in system frequency adjustment through virtual inertia control and pitch angle control.Through the fast response and flexible output characteristics of energy storage to make up for the insufficient of wind farms participating in system frequency modulation.On the demand side,the probability model of the charging load of Plug-in Electric Vehicles(PEV)is built to provide the cluster response.Then,to optimize the frequency response characteristics of the WG-ESS-PEV system,the joint control scheme is designed for the coordinated frequency response.Finally,a case study is conducted to verify the reliability of the system frequency control integrated model and control strategy proposed in this paper.