本文選題：模塊化多電平變流器　切入點：直流母線電壓平衡策略　出處：《湖南大學(xué)》2014年碩士論文

【摘要】：現(xiàn)今，多電平技術(shù)逐漸成為中高壓大功率傳動的主流技術(shù)。在現(xiàn)有的技術(shù)下，人們已經(jīng)能較為有成效的實現(xiàn)高性能的大功率中高壓傳動。但是仍然存在不少問題，二極管鉗位型和飛跨電容型多電平變流器大都只有三電平五點平的產(chǎn)品難以滿足國內(nèi)6KV、10KV甚至更高的電壓等級要求。級聯(lián)型高壓變頻器雖然通過一定數(shù)目單元子模塊的級聯(lián)可達到任意等級的電壓，但是由于其沒有公共的直流母線不能方便的進行能量的雙向流動，所以很難被應(yīng)用于需要四象限運行的高性能高壓變頻器系統(tǒng)。如果級聯(lián)型高壓變頻器要應(yīng)用于高性能的傳動系統(tǒng)則需要對級聯(lián)單元的不可控整流替換為可控的PWM整流器，這大大增加系統(tǒng)的復(fù)雜性，同時仍然不能避免主電路前端的工頻變壓器將電網(wǎng)電壓調(diào)整至合適的電壓值�；谝陨显�，本文在查閱了國內(nèi)外大量的文獻的基礎(chǔ)上提出了一種新型的基于模塊化多電平變流器(Modular Multilevel Converter，MMC)的高性能的高壓變頻器系統(tǒng)，該方案在國外和國內(nèi)研究的人較少，具有創(chuàng)新性和前瞻性。 模塊化多電平變流器是近年來興起的一種多電平結(jié)構(gòu)，該結(jié)構(gòu)與級聯(lián)型多電平變流器結(jié)構(gòu)相似，都是通過一定的模塊級聯(lián)而來，不同的是模塊化多電平子模塊能量來自直流母線，故采用背靠背結(jié)構(gòu)就能形成可四象限運行的高壓變頻器系統(tǒng)。本文從以下幾個方面闡述該新型高壓變頻器系統(tǒng)。 1）本文介紹了模塊化多電平的拓撲結(jié)構(gòu)以及基本的工作原理，其中包括半橋型模塊化多電平結(jié)構(gòu)和全橋型模塊化多電平結(jié)構(gòu)，并詳細探討了半橋以及全橋結(jié)構(gòu)的各種工作狀態(tài)。而后介紹了模塊化多電平變流器的調(diào)制算法。 2）引入了模塊化多電平的電氣模型，，在模塊化多電平電氣模型的基礎(chǔ)上進一步建立其數(shù)學(xué)模型，從數(shù)學(xué)模型出發(fā)，提出了一種模塊化多電平變流器直流母線電壓平衡的策略。 3）為了獲得一種高性能的高壓變頻器系統(tǒng)方案，本文將PWM整流算法以及感應(yīng)電機的矢量控制算法與模塊化多電平變流器進行了融合。 4）結(jié)合本文所提出的新型高性能高壓變頻器系統(tǒng)方案，搭建了相應(yīng)的MATLAB仿真模型，對模塊化多電平的基本調(diào)制算法、電壓平衡策略、PWM整流控制策略以及感應(yīng)電機的控制策略進行了仿真。仿真結(jié)果表明該方案的在理論上的可行性。
[Abstract]:Nowadays, multi-level technology has gradually become the mainstream technology of medium-high-voltage high-power transmission.In the existing technology, people have been able to achieve high-power high-power and high-voltage transmission.However, there are still many problems. Most of the multilevel converters with diode clamping and flying capacitance have only three level and five point flat. It is difficult to meet the domestic requirement of 6kV 10KV or higher voltage grade.Although cascaded high voltage converter can reach any level of voltage through the cascade of a certain number of unit submodules, it can not easily carry out the two-way flow of energy without a common DC bus.Therefore, it is difficult to be applied to high performance high voltage inverter system which needs four quadrant operation.If the cascaded high voltage converter is to be applied to the high performance transmission system, it needs to replace the uncontrollable rectifier of the cascade unit with the controllable PWM rectifier, which greatly increases the complexity of the system.At the same time, the power frequency transformer at the front end of the main circuit can not avoid adjusting the grid voltage to the appropriate voltage value.Based on the above reasons, this paper presents a new high voltage converter system based on modular multilevel converter Modular Multilevel converter MMC, which is based on a large number of literatures at home and abroad.Innovative and forward-looking.Modular multilevel converter is a kind of multilevel structure developed in recent years. It is similar to cascaded multilevel converter structure and is cascaded by certain modules.The difference is that the energy of the modularized multilevel sub-module comes from the DC bus, so a four-quadrant high voltage inverter system can be formed by using the back-to-back structure.This paper describes the new high-voltage inverter system from the following aspects.1) this paper introduces the topology and basic working principle of modularized multilevel, including half-bridge modularized multilevel structure and full-bridge modularized multilevel structure, and discusses the various working states of half-bridge and full-bridge structure in detail.Then the modulation algorithm of modularized multilevel converter is introduced.2) the modular multilevel electrical model is introduced, and the mathematical model is further established on the basis of modularized multilevel electrical model. Based on the mathematical model, a strategy of DC bus voltage balance for modularized multilevel converter is proposed.3) in order to obtain a high performance high voltage inverter system, this paper combines the PWM rectifier algorithm and the vector control algorithm of induction motor with the modular multilevel converter.4) combined with the new high voltage frequency converter system scheme proposed in this paper, the corresponding MATLAB simulation model is built, and the modularized multilevel basic modulation algorithm is proposed.Voltage balance strategy, PWM rectifier control strategy and induction motor control strategy are simulated.The simulation results show that the scheme is feasible in theory.
【學(xué)位授予單位】：湖南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM46

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