摘要
差动调速型风电机组通过机械化转速调节,实现发电机并网。并网控制是实现机组安全平稳并网的重要技术保障。利用MATLAB/Simulink平台,构建了风轮、传动链、调速电动机和发电机的差动调速型风电机组仿真模型。基于转差频率控制和模糊控制理论,设计了差动调速风电控制系统。对转速控制与机组最大功率追踪稳态特性进行了仿真试验,并通过搭建物理平台开展仿真试验分析。试验结果显示,发电机在3.5 s左右时,其转速基本保持在300 r/min的恒定转速。该结果表明:在空载并网阶段,调速电动机能够调节发电机的转速,使得发电机输出电压、频率等基本与电网一致,能够较好地满足并网要求。在额定风速下,模糊控制能够较好地使机组保持最大风能利用系数,验证了所设计控制系统的有效性与准确性。该结果对电网安全运行及智慧电网建设的深入研究具有一定的借鉴意义。
Differential speed-regulating wind turbines achieve the goal of variable input and constant output through mechanized speed regulation.Grid-connected control is an important technical guarantee to realize safe and stable operation of the unit.Simulation models of the wind turbine,including wind wheel,transmission chain,speed-regulating motor and generator,were constructed by MATLAB/Simulink platform.The differential speed regulating control system is designed based on slip frequency control and fuzzy control theory.The speed control function and characteristics on maximum power tracing of wind turbine was tested via simulation.Meanwhile,simulation test analysis was carried out by building physical experiment platform.Test results show that the rotational speed of the generator kept steady on the value of 300 r/min after 3.5 second of start-up of the generator.During idle load grid-connection stage,the speed of the generator was adjusted by the speed-regulating motor to keep the output voltage and frequency of the generator basically consistent with the power grid.The maximum wind power utilization coefficient was maintained by fuzzy controller under the rated wind speed.Thus,the accuracy and efficiency of the control system designed was proved.The results will bring about important implications to intensive study of safe operation of power grid and smart grid construction.
作者
芮晓明
谢鲁冰
高学伟
修长开
RUI Xiaoming;XIE Lubing;GAO Xuewei;XIU Changkai(School of Energy Power and Mechanical Engineering,North China Electric Power University,Beijing 102206,China)
出处
《自动化仪表》
CAS
2019年第12期35-40,45,共7页
Process Automation Instrumentation
关键词
差动调速
并网
模糊控制
风力发电机组
转速控制
风能利用系数
Differential speed regulation
Grid-connected
Fuzzy control
Wind turbine
Speed control
Wind power utilization coefficient
