【摘要】：近年來,新能源發(fā)電得到了迅速發(fā)展,但具有分散性、小型化和遠離主電網(wǎng)等特點,基于電壓源換流器的輕型高壓直流輸電系統(tǒng)(、Voltage Source Converter, High Voltage Direct Current transmission, VSC-HVDC)可以非常有效地將這些分散電源進行并網(wǎng)接入。傳統(tǒng)的VSC-HVDC輸電系統(tǒng)采用低電平VSC技術,不能滿足HVDC輸電系統(tǒng)的高電壓等級和大容量的要求,而且具有較高的開關頻率、輸出電壓諧波大、串聯(lián)器件存在動態(tài)均壓等問題。 模塊化多電平換流器(modular multilevel converter, MMC)不僅能滿足HVDC輸電系統(tǒng)的高電壓等級和大容量的要求,而且具有相對較低的開關頻率、容易實現(xiàn)冗余控制、分布電容式能量存儲、輸出電壓諧波含量少、具有公共直流母線等優(yōu)點,非常適用于HVDC輸電系統(tǒng)。 本文首先對模塊化多電平換流器的拓撲結(jié)構、工作原理、數(shù)學模型進行了詳細的分析說明,并介紹了幾種適用于MMC的調(diào)制方式。針對模塊化多電平換流器,提出了基于系統(tǒng)級、裝置級兩個層面上的控制策略,結(jié)合優(yōu)化的載波移相調(diào)制方式通過PSCAD/EMTDC仿真軟件進行了仿真驗證,驗證了其可行性。 通過對MMC控制裝置系統(tǒng)的硬件和軟件需求分析,提出了一種主從式架構控制裝置系統(tǒng),具有線配置模式、圖形化顯示、使用光纖總數(shù)少、子模塊控制器的智能型和獨立性高等優(yōu)點。對于MMC控制裝置的通信問題,設計了DMA通信方式和基于FPGA的光纖通信,實現(xiàn)了三級控制器間的高速通信。最后,對部分控制裝置系統(tǒng)進行了實驗調(diào)試分析,給出了硬件實物圖。
[Abstract]:In recent years, new energy generation has been developed rapidly, but it has the characteristics of dispersion, miniaturization and distance from the main power grid. The (, Voltage Source Converter, High Voltage Direct Current transmission, of HVDC system is based on voltage source converter. VSC-HVDC) can very effectively connect these decentralized power sources to the network. The traditional VSC-HVDC transmission system adopts low level VSC technology, which can not meet the requirements of high voltage level and large capacity of HVDC transmission system. It also has high switching frequency, high output voltage harmonic, dynamic voltage sharing of series devices, and so on. The modularized multilevel converter (modular multilevel converter, MMC) can not only meet the requirements of high voltage level and large capacity of HVDC transmission system, but also have relatively low switching frequency, easy to realize redundant control and distributed capacitive energy storage. The output voltage has less harmonic content and has the advantages of common DC bus, so it is very suitable for HVDC transmission system. In this paper, the topology, working principle and mathematical model of the modularized multilevel converter are analyzed in detail, and several modulation methods suitable for MMC are introduced. Aiming at the modularized multilevel converter, a control strategy based on system level and device level is proposed, and the feasibility is verified by PSCAD/EMTDC simulation software combined with the optimized carrier phase shift modulation. By analyzing the hardware and software requirements of MMC control device system, a master-slave architecture control device system is proposed, which has line configuration mode, graphical display, and less total number of optical fibers. The submodule controller has the advantages of intelligence and high independence. For the communication problem of MMC control device, the DMA communication mode and the optical fiber communication based on FPGA are designed, and the high speed communication between the three level controllers is realized. Finally, the experimental debugging and analysis of part of the control device system are carried out, and the hardware object diagram is given.
【學位授予單位】：安徽理工大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM721.1

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