风储联合系统调频控制策略研究

Frequency Control Strategy for Wind Storage Combined System

风力发电作为一种可再生能源发电在电网中的渗透率逐年升高,其具有的随机性、波动性和间歇性给电力系统的安全稳定运行带来了不利影响。与此同时,储能技术在近年来得到大力发展,其快速性和大范围吞吐性可以弥补风电机组单独运行时所带来的不利影响。首先对风电和储能系统的输出特性进行分析。其次针对风电并网发电在遇到频率波动时不具备惯性的问题,提出了应用储能补偿系统惯量,利用频率变化率作为反馈输入并调节惯量常数K,使风储联合系统作为一个整体对外提供有功功率参与电网调频,再利用Matlab/Simulink仿真验证了本文所提出控制策略补偿系统惯量的有效性。最后仿真对比风电机组单独参与电网调频与风储联合系统调频控制策略,得出风储联合系统参与电网调频的优越性。

Wind power as a renewable energy power generation in the power grid has been increased year by year.However due to the randomness,volatility and intermittency,the characteristics of wind have adverse impacts on safe and stable operation of grid.At the same time,energy storage technology has also been developing in recent years,whose rapidity and large-scale throughput can make up for the negative impact of wind turbine operation.Firstly,this paper analyses the output characteristics of wind power and energy storage system.Secondly,we apply the inertia of energy storage technology compensation system for the problem that wind power does not have the inertia during frequency fluctuation;use the frequency rate of change as the feedback input and adjust the inertia constant K.The wind storage combined system as a whole part provides active power to participate in the frequency adjustment of grid.Thirdly,we use Matlab/Simulink simulation to verify the proposed control strategy compensating for system inertia.Finally,compared with wind turbines participating in power grid frequency modulation in the simulation diagram,the superiority that wind storage combined system involved in power grid frequency modulation is proved.