本文選題：PWM整流器 + AC/DC變換器��； 參考：《湖南大學》2014年碩士論文

【摘要】：本文針對合肥某銅材有限公司的傳統(tǒng)整流技術改造項目，研究了一種適用于低壓配電網中的大功率高效節(jié)能型PWM整流器，用作電解電鍍高頻開關電源的前級AC-DC變換器，大大降低了整流器網側電流的諧波含量，，并提高了裝置運行的功率因數(shù)，實現(xiàn)了能量的高效利用，節(jié)約了成本。本文主要從以下幾個方面進行了研究： 首先分析了傳統(tǒng)大功率整流器的拓撲結構和工作原理，傳統(tǒng)大功率整流器常采用二極管或晶閘管整流。本文通過對網側電流畸變率和功率因數(shù)的對比分析總結了傳統(tǒng)整流器存在的主要問題。提出新型大功率整流器的拓撲結構，采用LCL濾波的三相橋式PWM整流器，對該整流器主電路的工作原理進行了詳細闡述并建立了數(shù)學模型。 深入研究了大功率應用場合下PWM整流器的控制策略。針對PWM整流器提出了一種功率前饋的復合電流無差拍控制方法，實現(xiàn)了對負載功率變化的實時跟蹤；針對LCL濾波電路，采用結合虛擬阻抗的控制方法，抑制諧振，維持了系統(tǒng)穩(wěn)定。通過仿真驗證了所提出控制策略的正確性和有效性。文中還對電網不對稱條件下的PWM整流器運行提出了控制策略，并進行了仿真分析。對本文設計的整流器控制系統(tǒng)進行了穩(wěn)定性分析，分析結果證明該控制方案具有良好的穩(wěn)定性。 研制了一臺額定功率為160kW的大功率高功率因數(shù)節(jié)能型PWM整流器，給出了PWM整流器裝置詳細的硬件系統(tǒng)與控制系統(tǒng)的設計方案。就大功率整流器工程實踐中的關鍵技術進行了研究，提出了提高直流側電壓利用率方案和功率模塊散熱系統(tǒng)設計方案。最后，給出了裝置的實際應用效果，結果表明本文研制的大功率高功率因數(shù)PWM整流器具有網側電流畸變率低、無污染、功率因數(shù)高等優(yōu)點。 本文針對傳統(tǒng)電化學整流器存在較大的諧波電流和效率低等問題，研究了大功率高功率因數(shù)PWM整流器的拓撲結構與控制技術，并結合工程實例給出了詳細的軟硬件設計方法。本文研究的成果可以為改造傳統(tǒng)整流技術提供借鑒和參考依據(jù)。
[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.
【學位授予單位】：湖南大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM461

【參考文獻】

相關期刊論文 前10條

1 李杰;陳國呈;王得利;馬

本文編號：1843670