本科毕业设计  题目：
基于SVPWM 的三相电压型 PWM 整器的仿真设计
学    院: 专    业: 学    号: 学生姓名: 指导教师: 日    期: 二〇一五年六月
摘要
电力电子器件目前已广泛应用于人们日常生活和工业生产中，而常规整流环节通常广泛采用二极管整流电路和晶闸管相控整流电路，这些不可控和相控整流会对电网注入了大量谐波，污染电网，消耗无功功率，降低功率因数。而三相电压型PWM整流器因其在保持输出电压恒定、提高系统功率因数、大幅降低谐波污染、能量绿利用等方面具有明显优势，在有源滤波、无功功率补偿以及交直流传动系统等领域得到了越来越广阔的应用。
本文详细阐述了PWM整流器的工作原理，结合理论分析了主电路功率器件的选取，并建立了基于三相和两相静止坐标系以及两相旋转坐标系的低频数学模型。选定本文主要研究对象为电压型三相桥式PWM整流器(三相VSR)。电压空间矢量脉宽调制(SVPWM)方式具有电压利用率高，电流谐波少等优点，因此对其基本原理和实现方法进行了详尽的讲解，并选择了其中谐波含量相对小的对称矢量排序策略。
为实现对网侧电流的独立控制，需对电流进行解耦控制。通过综合分析与对比，选择dq坐标系下的双环反馈直接电流控制策略，极大的改善了系统的动态性能和稳定性，最后基于Simulink建立了的控制系统的仿真模型，验证了控制方案的可行性。
在三相电压型PWM整流器系统的Simulink仿真研究中，整个系统主要包括以下模块：主电路模块、SVPWM控制模块以及PI模块，通过对PI参数的不断调整校正，使整流器实现了较好的整流效果。
关键字： PWM整流； SVPWM调制；双环反馈；直接电流控制；仿真研究
Abstract
Power electronic devices are now widely used in People's Daily life and industrial production, while the conventional rectifier section usually widely consists of diode-rectifier circuit and phase-control thyristor rectifier, which injects large amounts of harmonics into the power networks and produces much contamination. It would reactive power consumption and lower power factor. The three-phase voltage-source PWM rectifier(VSR) have the characteristics of constant direct voltage, green power, power flow high power factor, small harmonic pollution, so they have more and more application perspective in active filtering, reactive-load compensation and motor control systems.
The principle of PWM rectifier was introduced in details, analyzing the selection of power devices of main circuit combined with theoretical and constructing the low-frequency mathematical model based on the three-phase static coordinate system and the two-phase synchronous rotating coordinate system from the point of the topology of the main circuit. We select the three-phase bridge voltage type
PWM rectifier as this major study. With the voltage space vectors pulse width modulation, we can get higher usage of the voltage, at the same time it can effectively reduce the current harmonics. In this paper, the principle of three- phase voltage space vector and the specific implementation were analyzed in details, choosing the symmetric vector sequencing strategy with relatively small harmonic content.
In order to realize the independent control of the net side current, We have to get the current decoupled. The bicyclic directly current control scheme in dq rotation is selected, it makes the system more stable and faster response，and through the closed loop system simulation based on simulink to verify the feasibility of this current control scheme.
In the research of the system of the three-phase voltage-source PWM rectifier based on simulink, establish the main circuit model, SVPWM simulate module and simulate model of PI control conditioner. The rectifier will achieve good rectifying
effect by adjusting PI parameters calibration constantly.
Key words：PWM rectifier；SVPWM modulation；Double loop feedback；
Direct current control；Simulate research
目录
1 绪论 (1)
1.1 课题的研究背景与意义 (1)
1.1.1 谐波的危害和抑制 (2)
1.1.2 PWM整流器国内外研究现状 (2)
1.2 电压型PWM整流器的控制技术 (3)
1.3 本文的主要研究内容和重点 (4)
2 三相PWM整流器原理、控制策略与调制技术 (6)
2.1 PWM整流器的基本原理 (6)
2.2 PWM整流器的拓扑结构 (8)
2.2.1 单相全桥PWM整流器拓扑结构 (8)
2.2.2 三相半桥PWM整流器拓扑结构 (9)
reactivepower2.3 三相电压型PWM整流器的低频数学模型 (11)
2.3.1 ABC静止坐标系下的低频数学模型 (11)
2.3.2 两相旋转坐标系下的低频数学模型 (13)
2.4 三相电压型PWM整流器的电流控制策略 (15)
2.4.1 间接电流控制 (15)
2.4.2 直接电流控制 (16)
2.5 SVPWM调制技术基本原理 (17)
2.6 本章小结 (19)
3 三相电压型PWM整流器的建模和仿真 (21)
3.1 SVPWM算法实现 (21)
3.2 主电路参数设计 (26)
3.2.1 直流电压的选择 (26)
3.2.2 网侧电感值的设计 (27)
3.2.3直流侧电容的设计 (27)
3.3 电压空间矢量控制的三相VSR的仿真研究 (27)
3.3.1 三相VSR电流解耦 (27)
3.3.2三相VSR双环反馈PI参数设定 (29)
3.3.3三相VSR整流状态下的仿真结果 (31)
3.3.4 SVPWM与SPWM效果对比 (32)
3.4 本章小结 (33)
参考文献 (34)
结论与展望 (35)
致谢 (36)

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