基于矩阵变换器的双馈风力发电控制系统的研究

发布时间：2018-04-06 02:07

本文选题：变速恒频　切入点：双馈电机　出处：《安徽理工大学》2014年硕士论文

【摘要】：在风力发电领域,变速恒频(Variable-Speed Constant-Frequency,简称VSCF)发电系统有着显著的优越性和广阔的应用前景。在双馈型变速恒频风力发电系统中,双馈电机(Double-Fed Induction Generator,简称DFIG)转子侧的电源功率变换器是实现风力发电机组最大风能追踪、控制输出有功无功功率解耦、提高风力发电机组运行效率的关键。矩阵变换器(Matrix Converter,简称MC)是一种新型拓扑结构的变频装置,它不仅具有输入功率因数可调、输出电压可调、输出电流谐波少、能够实现四象限运行等优点,而且其结构紧凑,系统成本较低。与传统的交-直-交变换器相比,无中间直流环节及相应的储能电容,使得体积减小,动态响应提高。鉴于以上优点,本课题将双级交-交矩阵变换器(Two-Stage Matrix Converter,简称TSMC)作为双馈风力发电系统的功率励磁变换器。首先,本课题介绍了变速恒频系统运行的基本原理,并推导出DFIG的数学模型。对DFIG转子侧的交流励磁电源MC的拓朴结构,给出了矩阵变换器虚拟等效电路,依次介绍了Venturini直接法、瞬时电压法、空间矢量调制法等调制方法,经过对比最终确定采用间接空间矢量调制法调制各个开关对应的空间矢量。其次,本课题研究了基于TSMC励磁的双馈风力发电系统的控制策略。在对矢量控制思想进行分析的基础上提出了一种基于TSMC的双馈风力发电系统的控制策略,控制系统包括功率外环、电流内环双闭环控制结构,实现了发电系统定子输出有功功率和无功功率的解耦控制,并采用最大风能追踪控制策略,在不同风速下实现风能的最大化利用。最后,利用MATLAB/SIMULINK仿真软件,搭建了整个系统的仿真模型,并对实验仿真结果进行了分析。仿真结果表明,基于TSMC励磁的变速恒频双馈风力发电系统具有良好的稳、动态运行特性,输出可以实现有功、无功功率的解耦控制,且能够输出高质量的电能。最终验证了所提出控制系统方案的准确性和有效性。在此基础上,本课题采用TMS320F28335和EMP9320LC84-15作为控制芯片,设计出了控制系统的主功率电路、采样电路、驱动电路、过压吸收电路等。
[Abstract]:In the field of wind power generation, Variable-Speed Constant-Frequency (VSCF) power generation system has obvious advantages and broad application prospects.In the doubly-fed variable speed constant frequency wind power generation system, the double-fed double-fed Induction generator (DFIGG) rotor side power converter is used to realize the maximum wind power tracking of the wind turbine and to control the decoupling of the output active and reactive power.The key to improve the efficiency of wind turbine.Matrix Converter (MCV) is a new type of converter with topological structure. It not only has the advantages of adjustable input power factor, adjustable output voltage, less harmonic output current, but also can realize four-quadrant operation, and its structure is compact.The system cost is lower.Compared with the conventional AC-DC-AC converter, the volume of the converter is reduced and the dynamic response is improved without the intermediate DC link and the corresponding energy storage capacitance.In view of the above advantages, the two-stage AC-AC matrix converter / Two-Stage Matrix converter (TSMC) is used as the power excitation converter in the doubly-fed wind power generation system.Firstly, the basic principle of variable speed constant frequency system is introduced, and the mathematical model of DFIG is deduced.For the topology of AC excitation power supply MC in DFIG rotor side, the virtual equivalent circuit of matrix converter is given. The modulation methods such as Venturini direct method, instantaneous voltage method and space vector modulation method are introduced in turn.After comparison, the indirect space vector modulation method is used to modulate the space vector corresponding to each switch.Secondly, the control strategy of doubly-fed wind power system based on TSMC excitation is studied.Based on the analysis of vector control theory, a control strategy of doubly-fed wind power generation system based on TSMC is proposed. The control system consists of power outer loop and current inner loop double closed loop control structure.Decoupling control of stator output active power and reactive power is realized, and the maximum wind energy tracking control strategy is adopted to maximize the utilization of wind energy under different wind speeds.Finally, the simulation model of the whole system is built by using MATLAB/SIMULINK software, and the simulation results of the experiment are analyzed.The simulation results show that the variable speed constant frequency doubly-fed wind power generation system based on TSMC excitation has good stability, dynamic operating characteristics, output can realize active and reactive power decoupling control, and can output high quality electric energy.Finally, the accuracy and validity of the proposed control system are verified.On this basis, the main power circuit, sampling circuit, driving circuit and overvoltage absorption circuit of the control system are designed by using TMS320F28335 and EMP9320LC84-15 as the control chip.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM614

【参考文献】