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题名	IGBT电流型变流技术研究; IGBT电流型变流技术研究
作者	1谈龙成,电工研究所
学位类别	博士
答辩日期	2009-05-25
授予单位	中国科学院电工研究所
导师	1李耀华,电工研究所
关键词	电流型Back-to-Back变流器 电流型整流器 电流型逆变器 脉宽调制 功率因数控制 有源减震 输出电压控制 联合控制 current source Back-to-Back converter current source rectifier current source inverter pulse width modulation power factor control active damping output voltage control combined control
其他题名	IGBT电流型变流技术研究
中文摘要	Back-to-Back变流器根据直流侧电源性质的不同可主要分为两大类：直流侧是电流源的电流型变流器和直流侧是电压源的电压型变流器，两种变流器各具特点和优势。相对而言，电压型变流器获得了更多的理论研究和实际应用，而作为其对偶体的电流型变流器却较少受到人们的关注，因此很有必要对电流型变流器进行深入分析和研究。本论文以电流型Back-to-Back变流器为主要研究对象，对适用于电流型变流器的脉宽调制技术，电流型PWM整流器的功率因数控制技术和交流侧LC谐振的抑制技术，电流型PWM逆变器的输出电压控制技术，以及整个电流型Back-to-Back变流器系统的联合控制技术等内容进行了深入的理论研究和分析，并在此基础上通过计算机仿真和样机试验验证了本论文所提出的控制策略的有效性和正确性。 论文首先研究了适用于电流型变流器的脉宽调制技术，主要包括SHE、TPWM、SPWM和SVM等技术。在分析各种PWM技术基本原理的基础上，重点研究了它们的谐波特性、直流侧电流利用率、动态响应速度以及数字化实现方法等方面的内容。为了进一步提高直流侧电流利用率，本文提出了SVM的两种过调制策略，并分别对其进行了深入的理论推导和谐波特性分析。 为了研究电流型PWM整流器的稳态特性建立了它在三相静止坐标系下和同步旋转坐标系下基于开关函数的一般数学模型及简化数学模型。稳态特性重点分析了直流侧电压和电流特性，有功功率和无功功率特性，功率因数特性，以及单位功率因数运行的条件等，为电流型PWM整流器的控制提供了理论基础。 论文提出了一种基于电网电压定向的功率因数控制方法，首先建立了电网电压定向时PWM-CSR的简化数学模型，然后详细分析了这种功率因数控制的运行原理，最后对PWM-CSR的运行边界进行了深入研究，从理论上证明了PWM-CSR的单位功率因数运行范围，得到了有功率因数控制时PWM-CSR的最优工作曲线；同时研究了基于电容电压定向的功率因数控制方法，并将两者进行了对比分析。最后对这两种功率因数控制方法都进行了详细的仿真分析和试验验证。 针对PWM-CSR交流侧LC易发生谐振的现象，研究了基于虚拟电阻的有源减震控制策略，推导了发生LC串联谐振和并联谐振的条件，并得到了虚拟电阻的设计公式，最后通过仿真和试验验证了该方法的正确性和有效性。 建立了电流型PWM逆变器在三相静止坐标系下，两相静止坐标系下和同步旋转坐标系下基于开关函数的一般数学模型及简化数学模型，深入分析了PWM-CSI在线性负载和非线性负载条件下的输出电压控制策略，并从基本的数学关系推导出了线性比例积分器(PI)与比例正弦信号积分器(PSSI)之间的内在联系，然后提出了一种电流型PWM逆变器在线性负载和非线性负载条件下基于PSSI控制器的新型输出电压控制方法，并与PI控制进行了对比研究，仿真和试验结果一致证明这种控制方法的有效性和优越性。 针对常见的电流型Back-to-Back变流器的联合控制所带来的系统响应速度慢或运行效率低等缺点，论文提出了一种改进的将逆变侧输出电压、逆变侧调制比和直流侧电流统一起来联合进行控制的方法，该方法能够在降低系统损耗的同时提高系统的动态响应速度，并且保证稳态时输出电压的谐波含量不变。论文对整个系统的各个控制环节都进行了深入的研究，最后对这种控制方法进行了详尽的仿真分析和试验验证。 Back-to-Back converters can be mainly divided into two groups according to the dc link type: the current source converter (CSC) with a current source dc link and the voltage source converter (VSC) with a stiff voltage source dc link, and both of them have their own characteristics and advantages. Compared to current source converter, more research work and real implementation have been done for VSC. However, as the dual of it, CSC has received less attention, so it’s very necessary to do intensive analysis and thorough research on CSC. The thesis mainly focuses on the current source Back-to-Back converter, and does deeply theoretical research on the pulse width modulation (PWM) techniques for CSC, the power factor control methods for the current source PWM rectifier (PWM-CSR), the suppression techniques for the LC resonance of PWM-CSR, the output voltage control methods for the current source PWM inverter (PWM-CSI), and the combined control strategies for the whole current source Back-to-Back converter. Finally, the effectiveness and the correctness of the proposed techniques in this thesis have been verified by both the computer simulation and the prototype experiment results. The PWM techniques suitable for CSC have been firstly studied in the thesis, mainly including the SHE, TPWM, SPWM and SVM, etc. Their harmonic characteristics, the utilization ratios of the dc link current, the dynamic response and their digital implementation methods are mainly researched on the basis of analyzing the fundamental theories of them. In order to improve the dc-side current utilization ratio, two overmodulation techniques for SVM have been proposed in this thesis, and the deep theoretical derivation and harmonic analysis have been done for them. In order to research the steady characteristics of PWM-CSR, the general mathematical models based on the switching function have been established both in the stationary three phase coordinate and the synchronous rotating coordinate, then the simplified models are founded. The steady characteristics mainly focus on the dc link voltage and current, the active and reactive power, the power factor and the unity power factor condition and so on, all of which have provided theoretical bases for the control of PWM-CSR. The power factor control method based on the grid voltage orientation has been proposed in this thesis. Firstly, the simplified mathematical model for PWM-CSR has been established based on this voltage orientation. Then, the power factor control principle has been analyzed in detail. Finally, the operation region boundary has been deeply investigated, especially the unity power factor operation area has been proved theoretically, from which the optimal operation curve has been obtained. Meanwhile, the power factor control method based on the capacitor voltage orientation has also been deeply researched, and the comparison between them has been done. At last, detailed simulation analysis and experimental verification have been done for the two power factor control methods. Aiming at the incidental LC resonance at the ac-side of the PWM-CSR, the active damping control based on the virtual resistor has been investigated to suppress this resonance. The occurrence conditions for series LC resonance and parallel LC resonance have been both deduced, and the design formula for the damping resistor has also been given. Both the simulation and experiment results have validated the correctness and effectiveness of this control method. The mathematical models based on the switching function for the PWM-CSI have been established in the stationary three phase coordinate, in the stationary two phase coordinate and in the synchronous rotating coordinate respectively. Then, the output voltage control techniques for PWM-CSI under linear and nonlinear load conditions have been studied. The internal relations between the linear Proportional Integrator (PI) and the Proportional Sinusoidal Signal Integrator (PSSI) have been derived from the basic mathematic derivation. Finally, the output voltage control methods based on the PSSI controller have been proposed for PWM-CSI with linear and nonlinear loads respectively. Meanwhile, the comparative analysis between it and the PI controller has also been done. The simulation results and the experiment results have proved the effectiveness and superiority of the proposed voltage control method. In order to overcome the system’s slow response and the low operation efficiency brought by the conventional combined control methods for the whole current source Back-to-Back converter, this thesis proposes an impoved combined control method, which controls the output voltage of PWM-CSI, the modulation index of PWM-CSI and the dc link current cooperatively. This method can not only reduce the system loss, but also improve the dynamic response of the system, and keep the harmonic contents of the output voltage invariant in the steady state. Every control loop of the whole system has been deeply researched in this thesis, finally the detailed simulation analysis and the experiment verification have been done to validate the proposed control strategy.
语种	中文
公开日期	2010-10-18
页码	152
分类号	TM1;TM921
内容类型	学位论文
源URL	[http://ir.iee.ac.cn/handle/311042/6832]
专题	电工研究所_其他部门_其他部门_博士学位论文
推荐引用方式 GB/T 7714	1谈龙成,电工研究所. IGBT电流型变流技术研究, IGBT电流型变流技术研究[D]. 中国科学院电工研究所. 2009.

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