摘要
Abstract
In the process of primary frequency regulation and inertia response adjustment in wind farms,abnormal commands,improper power allocation,frequent adjustments,and other situations can easily lead to sustained overload,decreased control accuracy,vibration shutdown,and premature withdrawal of inertia response due to insufficient inertia support capacity of wind turbines.Based on this,this paper proposes a wind farm frequency regulation control strategy based on fluctuation-accuracy dual objective optimization(hereinafter referred to as"this frequency regulation control strategy").Firstly,in order to solve the contradiction between speed and reverse overshoot suppression in primary frequency regulation control,a layered frequency regulation strategy and a dynamic grouping active power allocation strategy for wind farms are proposed to optimize the control effect of primary frequency regulation.Then,a multi time scale inertia support capability evaluation model is established for inertia response control.An inertia response active power allocation strategy based on the wind conditions of each wind turbine is designed,and an inertia response exit protection mechanism is established.Finally,taking a wind farm in Heilongjiang Province as an example,the frequency regulation control strategy is tested and verified.The research results show that:1)This frequency regulation control strategy can control the control accuracy of the wind farm's primary frequency regulation within 5‰ and the adjustment time within 5 s.The proposed inertia response active power allocation strategy can effectively avoid some wind turbines from prematurely withdrawing from inertia response due to insufficient inertia support capacity.2)After a frequency regulation and inertia response,it is advisable to use pitch control to restore power to steady state,which can avoid secondary frequency fluctuations.3)The added primary frequency regulation active exit mechanism and inertia response exit protection mechanism can ensure that wind turbines can safely exit and smoothly transition to normal AGC mode in the event that the primary frequency regulation and inertia response action status signals do not return for a long time.This frequency control strategy significantly improves the control performance of wind farms in power fluctuation scenarios,ensuring the safe and stable operation of wind turbines,and providing an efficient and safe solution for wind farm level primary frequency regulation control.关键词
风电场/一次调频/惯量响应/功率分配/惯量支撑能力/保护机制/控制精度Key words
wind farms/primary frequency regulation/inertia response/power allocation/inertia support capability/protection mechanism/control accuracy分类
能源科技
