大功率高功率因数PWM整流器的研制

发布时间：2018-05-04 16:09

本文选题：PWM整流器 + AC/DC变换器　；参考：《湖南大学》2014年硕士论文

【摘要】：本文针对合肥某铜材有限公司的传统整流技术改造项目，研究了一种适用于低压配电网中的大功率高效节能型PWM整流器，用作电解电镀高频开关电源的前级AC-DC变换器，大大降低了整流器网侧电流的谐波含量，，并提高了装置运行的功率因数，实现了能量的高效利用，节约了成本。本文主要从以下几个方面进行了研究：首先分析了传统大功率整流器的拓扑结构和工作原理，传统大功率整流器常采用二极管或晶闸管整流。本文通过对网侧电流畸变率和功率因数的对比分析总结了传统整流器存在的主要问题。提出新型大功率整流器的拓扑结构，采用LCL滤波的三相桥式PWM整流器，对该整流器主电路的工作原理进行了详细阐述并建立了数学模型。深入研究了大功率应用场合下PWM整流器的控制策略。针对PWM整流器提出了一种功率前馈的复合电流无差拍控制方法，实现了对负载功率变化的实时跟踪；针对LCL滤波电路，采用结合虚拟阻抗的控制方法，抑制谐振，维持了系统稳定。通过仿真验证了所提出控制策略的正确性和有效性。文中还对电网不对称条件下的PWM整流器运行提出了控制策略，并进行了仿真分析。对本文设计的整流器控制系统进行了稳定性分析，分析结果证明该控制方案具有良好的稳定性。研制了一台额定功率为160kW的大功率高功率因数节能型PWM整流器，给出了PWM整流器装置详细的硬件系统与控制系统的设计方案。就大功率整流器工程实践中的关键技术进行了研究，提出了提高直流侧电压利用率方案和功率模块散热系统设计方案。最后，给出了装置的实际应用效果，结果表明本文研制的大功率高功率因数PWM整流器具有网侧电流畸变率低、无污染、功率因数高等优点。本文针对传统电化学整流器存在较大的谐波电流和效率低等问题，研究了大功率高功率因数PWM整流器的拓扑结构与控制技术，并结合工程实例给出了详细的软硬件设计方法。本文研究的成果可以为改造传统整流技术提供借鉴和参考依据。
[Abstract]:In this paper, a high-power and high-efficiency energy-saving PWM rectifier suitable for low voltage distribution network is studied, which is used as the front-stage AC-DC converter for electroplating high-frequency switching power supply, aiming at the renovation project of traditional rectifier technology of a certain copper Co., Ltd in Hefei. The harmonic content of the rectifier is greatly reduced, the power factor of the device is improved, the energy is utilized efficiently and the cost is saved. This article mainly carries on the research from the following several aspects: Firstly, the topology and working principle of traditional high power rectifier are analyzed. Diode or thyristor rectifier is often used in traditional high power rectifier. In this paper, the main problems of traditional rectifier are summarized by comparing the current distortion rate and power factor of grid side. The topology of a new type of high power rectifier is presented. The three-phase bridge PWM rectifier with LCL filter is used. The working principle of the main circuit of the rectifier is described in detail and the mathematical model is established. The control strategy of PWM rectifier in high power applications is studied. This paper presents a power feedforward deadbeat control method for PWM rectifier, which realizes real-time tracking of load power change, and combines virtual impedance control method to suppress resonance for LCL filter circuit. The stability of the system is maintained. Simulation results show that the proposed control strategy is correct and effective. The control strategy for the operation of PWM rectifier under the condition of asymmetric power network is also proposed, and the simulation analysis is carried out. The stability of the rectifier control system designed in this paper is analyzed and the results show that the control scheme has good stability. A high power and high power factor energy-saving PWM rectifier with rated power of 160kW is developed. The detailed design of hardware system and control system for PWM rectifier is presented. The key technologies in the engineering practice of high power rectifier are studied, and the scheme of improving the utilization ratio of DC side voltage and the design scheme of heat dissipation system of power module are put forward. Finally, the practical application effect of the device is given. The results show that the high power and high power factor PWM rectifier developed in this paper has the advantages of low grid-side current distortion rate, no pollution, high power factor and so on. Aiming at the problems of large harmonic current and low efficiency in traditional electrochemical rectifier, the topology structure and control technology of high power and high power factor PWM rectifier are studied in this paper, and a detailed design method of hardware and software is given in combination with an engineering example. The results of this paper can be used for reference and reference for the improvement of traditional rectifying technology.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM461

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