基于Quasi-Z源矩阵变换器的双馈风力发电系统研究

发布时间：2018-10-18 07:27

【摘要】：当今，全球化石能源日渐枯竭、能源危机、日益严重的雾霾等问题迫在眉睫，所以对清洁能源风能的开发利用具有非常重要的战略意义。本文通过分析Quasi-Z源网络在逆变器中具有放大输出电压的性能，运用科学类比的思维模式将Quasi-Z源网络应用于传统的矩阵变换器，以期望突破传统矩阵变换器中电压传输比仅为0.866的这一瓶颈。为此，本文提出了一种新型的Z源拓扑结构，即Quasi-Z源矩阵变换器。采用该Quasi-Z源拓扑结构的矩阵变换器的优势在于：能够有效提高电压传输比；输出侧电压电流波形不受输入侧的影响；有效减小启动时变换器开关器件的冲击电流，降低损耗。本文研究的主要内容分为三个层面。首先，从系统的角度分析了变速恒频双馈风力发电机的整体结构特点；阐述了双馈电机运行原理，接着推导出双馈电机的稳态数学模型；从实际应用的角度，将参考坐标系中的坐标变换理论应用到了双馈电机的动态电路中，，即推导出了双馈电机在d-q坐标系下的数学模型，在此基础上本文针对常规矢量控制中存在电流耦合情况，结合参考文献，设计出了一种新型、简易的电流前馈解耦控制方案。然后，为验证Quasi-Z源矩阵变换器性能，采用MATLAB/SIMULINK软件来搭建软件仿真平台，通过搭建基于Quasi-Z源矩阵变换器的异步感应电动机的模型来进行仿真。仿真结果表明：该Quasi-Z源矩阵变换器具有电压增益大于1、输入输出波形良好、谐波畸变率低等特点。最后，本文采用PSCAD模型嵌入MATLAB的程序语言的联合仿真方式对基于Quasi-Z源矩阵变换器的双馈风力发电系统进行验证。从稳态性能的角度给出了1.5MW、690V双馈异风力发电系统的电流、电压、功率、转矩等参数的手工计算过程，详细的分析了稳态情况下系统的各项参数的大小。最后比较分析了在不同的风速工况下，双馈风力发电系统有功无功功率的输出波形，仿真结果表明了Quasi-Z源矩阵变换器应用于双馈风力发电系统的合理性。
[Abstract]:Nowadays, the global fossil energy is increasingly exhausted, energy crisis, increasingly serious problems such as haze imminent, so the development and utilization of clean energy wind energy has a very important strategic significance. In this paper, the Quasi-Z source network is applied to the traditional matrix converter by analyzing the capability of amplifying the output voltage in the inverter, and applying the scientific analogy mode of thinking to the Quasi-Z source network. It is expected to break through the bottleneck of voltage transfer ratio of 0.866 in traditional matrix converter. Therefore, a new type of Z-source topology, Quasi-Z source matrix converter, is proposed in this paper. The advantages of the matrix converter with Quasi-Z topology are that it can effectively improve the voltage transfer ratio, the output voltage and current waveforms are not affected by the input side, and the impulse current and loss of switching devices are effectively reduced when the converter starts up. The main content of this paper is divided into three levels. First of all, the whole structure characteristics of variable speed constant frequency doubly-fed wind turbine are analyzed from the point of view of system, the operation principle of double-fed wind turbine is expounded, and the steady mathematical model of doubly-fed wind turbine is deduced. The coordinate transformation theory in the reference coordinate system is applied to the dynamic circuit of the doubly-fed machine, that is, the mathematical model of the doubly-fed machine in d-q coordinate system is derived. With reference, a new and simple current feedforward decoupling control scheme is designed. Then, in order to verify the performance of Quasi-Z source matrix converter, MATLAB/SIMULINK software is used to build the software simulation platform, and the model of asynchronous induction motor based on Quasi-Z source matrix converter is built to simulate. The simulation results show that the Quasi-Z source matrix converter has the characteristics of voltage gain greater than 1, good input and output waveform and low harmonic distortion rate. Finally, the paper uses the PSCAD model embedded in the MATLAB programming language to verify the doubly-fed wind power generation system based on Quasi-Z source matrix converter. From the point of view of steady-state performance, the manual calculation process of parameters such as current, voltage, power, torque and so on for 1.5MW / 690V doubly-fed wind power generation system is given, and the parameters of the system under steady state are analyzed in detail. Finally, the output waveforms of active and reactive power of doubly-fed wind power generation system under different wind speed conditions are compared and analyzed. The simulation results show that the Quasi-Z source matrix converter is reasonable for the doubly-fed wind power generation system.
【学位授予单位】：南昌大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM614

【参考文献】