摘要
风电机组的友好型调频控制对改善风电并网系统的频率响应特性具有重要作用。该文在分析最大功率跟踪(maximum power point tracking,MPPT)运行风电机组,利用变比例系数调速、飞轮储能基于功率调节实现频率支撑可行性的基础上,从优化风储系统频率响应特性出发,基于协同控制理论,提出飞轮储能协同MPPT运行风电机组提供频率响应的两层协同控制方案。通过将频率偏差和风电机组虚拟电气惯量线性组合构成宏变量,并利用宏变量的零输入响应控制流形,设计实现不同风速风电机组协同提供频率支撑的变比例系数调速策略。进一步,基于频率偏差、储能调频功率指令和风电机组虚拟惯量的线性组合构成宏变量,采用相同的控制流形设计飞轮储能协同风电机组提供频率支撑、快速恢复风电机组MPPT运行和避免频率二次扰动的附加调频有功调节策略。最后,利用风电并网系统的负荷频率扰动,验证所提协同控制的有效性,结果表明,该策略不仅有助于提高系统恢复同步稳定的动态特性,而且能够降低同步发电机参与调频的有功调节速度要求。
The friendly frequency response of wind generators(WGs)is important for improving the frequency dynamic performance of power system connected with high proportion wind power.In this paper,the feasibility for both maximum power point tracking(MPPT)operation WGs using variable proportion coefficient to regulate the rotor speed and flywheel energy storage system(FESS)using power condition to provide frequency support was studied at first.Then,from considering to optimize the frequency response characteristics of WGs-FESS system,the bilayer synergetic control(SC)scheme for coordinating the FESS with the MPPT operation WGs to provide frequency response was proposed based on SC theory.Through constructing the macro variable of linearly combining grid frequency deviation with the virtual electrical inertia of WGs,the variable proportion coefficient based rotor speed regulation strategy of MPPT operation WGs at different wind speed coordinately providing inertia support was designed based on the control manifold of the zero input response of macro variable.Further,linearly combining the power condition reference with the macro variable was used to implementing the SC based inertia support of the WGs.The active power condition strategy which makes the FESS to cooperate with the WGs in providing frequency support and quickly restore the MPPT operation of the WGs without causing the secondary frequency disturbance was designed based on the same control manifold.Finally,the validity of the proposed bilayer SC control strategy was verified by the simulation of load frequency disturbance in the power grid connected with WGs.The simulation results also indicate that the strategy not only is beneficial for improving the dynamic characteristics of power system recovering synchronous stability,but also is able to reduce the speed requirement of active power regulation used for the synchronous generator regulating frequency.
作者
梁恺
彭晓涛
秦世耀
王靖然
张政
陈人杰
LIANG Kai;PENG Xiaotao;QIN Shiyao;WANG Jingran;ZHANG Zheng;CHEN Renjie(School of Electrical Engineering and Automation,Wuhan University,Wuhan 430072,Hubei Province,China;China Electric Power Research Institute,Haidian District,Beijing 100192,China;State Grid Jibei Electric Power Company,Xicheng District,Beijing 100053,China)
出处
《中国电机工程学报》
EI
CSCD
北大核心
2021年第8期2628-2640,共13页
Proceedings of the CSEE
基金
国家重点研发计划项目(2018YFB0904000)。
关键词
频率响应
协同控制
风电机组
储能
最大功率点跟踪
frequency response
synergetic control
wind generator
energy storage
maximum power point tracking(MPPT)
