摘要
为解决现有双馈风电机组频率控制策略不能充分利用转子动能支撑电网频率及风机转速恢复造成的二次频率冲击问题,提出了一种计及转速平滑恢复的双馈风电机组自适应频率控制策略。首先在电网频率支撑阶段,借助指数函数将风电机组频率控制系数和电网频率偏差建立耦合关系,使频率控制系数随频率偏差增加而变大,从而使风电机组在频率支撑阶段释放更多能量,提高频率最低点;其次在风机转速恢复阶段,借助一次递减函数在预设时间内将控制系数平滑减少至零,实现可控的转速恢复,同时消除转速恢复对频率的二次冲击。最后,通过EMTP-RV软件搭建了IEEE 4机2区域的电力系统模型,验证了所提策略的有效性。
The existing frequency control method of doubly-fed induction generators(DFIGs)is unable to fully use the rotor rotational energy to support the frequency and a secondary frequency drop is caused during the rotor speed recovery of the DFIG.To address these issues,this paper suggests a self-adaptive frequency control scheme of a DFIG with smooth rotor speed recovery.First,during the frequency support stage,the coupling relationship between the droop control coefficient of DFIGs and the frequency deviation is established using the exponential function so that the control coefficient becomes large with the increasing frequency deviation.DFIGs can release more rotational energy to the power grid and then improve the frequency nadir.Secondly,during the speed recovery stage,the control coefficient gradually decreases to zero within the preset period by using the first-order decreasing function so as to achieve controllable rotor speed recovery and remove the secondary frequency drop.Finally,an IEEE 4-machine 2-area power system model is modeled using an EMTP-RV simulation to illustrate the effectiveness of the proposed frequency control scheme.
作者
杨德健
许益恩
高洪超
郑太英
金恩淑
YANG Dejian;XU Yien;GAO Hongchao;ZHENG Taiying;JIN Enshu(Key Laboratory of Modern Power System Simulation and Control&Renewable Energy Technology Ministry of Education(Northeast Electric Power University),Jilin 132012,China;College of Electrical Engineering,Nantong University,Nantong 226019,China;Department of Electrical Engineering,Tsinghua University,Beijing 100084,China;College of Electrical Engineering,Zhejiang University,Hangzhou 310058,China)
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2022年第6期172-179,共8页
Power System Protection and Control
基金
国家自然科学基金项目资助(51877112)
江苏省高校自然科学基金项目资助(20KJB470026)。
