摘要
为提高双馈异步发电机的低压穿越能力,提出了一种基于显式模型预测控制的改进虚拟阻抗控制方法。传统的虚拟阻抗法基于固定的虚拟阻值,补偿电压在不同的故障情况下不能灵活调整,其控制效果难以得到保证,特别是在不对称故障下,易造成转子变换器饱和,影响控制效果。所提出的显式模型预测控制方法结构简单、易于实现,并可充分抑制转子电流,实现故障穿越。此外,该方法采用离线推导分区的最优控制率,在线求解只需查找相应的控制率,计算速度快,能满足暂态期间的计算要求。详细介绍了该方法的设计原理,并在Matlab/Simulink中进行了验证。结果表明,所提出的控制方案性能良好,能够提高双馈发电机在低电压穿越下,特别是不平衡故障下的低电压穿越能力。
In this paper,an improved virtual impedance control,based on the Explicit Model Predictive Control(E-MPC)is proposed to improve the Low Voltage Ride Through(LVRT)capability of the Doubly Fed Induction Generators(DFIGs).The traditional virtual impedance method is based on fixed virtual resistance,and its control effect is difficult to be guaranteed under different fault conditions,especially under the asymmetric fault.The proposed E-MPC approach can fully explore the potential of rotor side converter.Besides,the control parameters of E-MPC are derived offline and very efficient for online control.In addition,the proposed E-MPC structure is simple and easy to be implemented.The mechanism of proposed E-MPC is presented in detail and verified in Matlab/Simulink.The results show that the proposed control scheme has a good performance and can improve the LVRT capability of DFIGs under various fault conditions,especially unbalanced faults.
作者
罗嘉
赵浩然
高术宁
王鹏
孙开宁
LUO Jia;ZHAO Haoran;GAO Shuning;WANG Peng;SUN Kaining(Key Laboratory of Power System Intelligent Dispatch and Control(Shandong University),Ministry of Education,Jinan 250061,Shandong Province,China;School of Electrical Engineering and Computer Sciences,Technical University of Berlin,Berlin 14195,Germany;State Grid Xinjiang Electric Power Co.,Ltd.,Urumqi 830002,Xinjiang Uygur Autonomous Region,China)
出处
《电网技术》
EI
CSCD
北大核心
2021年第5期1716-1723,共8页
Power System Technology
基金
国家重点研发计划项目(2018YFB0904000)。
关键词
双馈感应电机
虚拟阻抗控制
显式模型预测控制
低电压穿越
doubly fed induction generators(DFIG)
virtual impedance control
explicit model predictive control(E-MPC)
low voltage ride through(LVRT)
