考虑加快电网频率恢复的风电机组自适应虚拟惯性控制策略  

Adaptive virtual inertia control strategy of wind turbine considering accelerating grid frequency recovery

作　　者：王宇焱 邱晓燕[1] Wang Yuyan;Qiu Xiaoyan(College of Electrical Engineering,Sichuan University,Chengdu 610065,China)

机构地区：[1]四川大学电气工程学院,四川成都610065

出　　处：《可再生能源》2023年第4期514-521,共8页Renewable Energy Resources

摘　　要：传统风电机组虚拟惯性控制的惯性时间常数较大,虽抑制了频率变化率(Rate of Change of Frequency,ROCOF),但也阻碍了频率的恢复。文章提出了一种风电机组自适应虚拟惯性控制,该控制在频率扰动初期能够提供适当的虚拟惯性支撑,同时在频率恢复期间加快频率恢复。首先,文章控制策略在频率跌落或者上升阶段,根据ROCOF的最大值,自适应计算出虚拟惯性时间常数。该值一直保持到ROCOF的极性发生变化,切换至根据ROCOF计算出的虚拟惯性时间常数,此时的ROCOF较小,虚拟惯性时间常数趋于零。故在频率恢复阶段,风电机组退出虚拟惯性支撑,从而帮助频率加快恢复。在PSCAD/EMTDC中搭建仿真算例,仿真结果,表明文章所提控制策略能够提供虚拟惯性支撑和加快扰动后频率恢复。The larger inertia time constant of traditional virtual inertia control of wind turbine can restrain the frequency change rate well,but it also hinders the recovery of frequency.In order to solve this contradiction,an adaptive virtual inertia control method is proposed,which can provide appropriate virtual inertia support for power system at the initial stage of frequency disturbance and accelerate frequency recovery during frequency recovery.In the phase of frequency drop or rise,the virtual inertia time constant is calculated adaptively according to the maximum value of frequency change rate.And this value is maintained until the polarity of the frequency change rate changes and switches to the virtual inertial time constant calculated according to the frequency change rate.At this time,the frequency change rate is small,and the virtual inertia time constant tends to zero.Therefore,in the frequency recovery stage,the wind turbine exits the virtual inertia support,which can help speed up the frequency recovery.Finally,a simulation example is built in PSCAD/EMTDC,and the simulation results show that the proposed control strategy can provide appropriate virtual inertial support and speed up the frequency recovery during frequency recovery.

关 键 词：风电机组 虚拟惯性 ROCOF 自适应控制 

分 类 号：TK81[动力工程及工程热物理—流体机械及工程]