本文關鍵詞：電網不平衡時模塊化多電平換流器的控制研究　出處：《合肥工業(yè)大學》2015年碩士論文　論文類型：學位論文

  更多相關文章： 模塊化多電平換流器 電壓平衡 電網不平衡 分層式控制系統(tǒng) 實驗平臺

【摘要】：近年來,隨著電力電子技術的發(fā)展,高壓大功率電力電子設備被廣泛應用于電力系統(tǒng)中的柔性交流輸電、高壓直流輸電、靜止無功補償?shù)葓龊?其能夠有效地提高系統(tǒng)電能質量和輸配電系統(tǒng)效率。隨著新能源的快速發(fā)展,柔性直流輸電技術將會在我國未來電網的發(fā)展中起到十分關鍵的作用。在柔性直流輸電工程中,多電平換流器由于其輸出波形諧波含量低、功率器件電壓應力低等優(yōu)點,被越來越多地應用于高壓大功率領域中。在眾多多電平拓撲中,模塊化多電平拓撲(MMC)由于具有模塊化易擴展、良好的冗余特性、輸出諧波低、功率器件開關頻率低等優(yōu)點,使之成為近年來的研究熱點。本文首先對MMC的拓撲結構及工作原理進行了分析,分析推導了MMC正常工作時上下橋臂電壓,輸出交流電壓及上下橋臂電流,環(huán)流和交流輸出電流之間的關系。對目前常用的調制策略、電容電壓平衡技術做了全面的闡述,詳細分析了載波層疊PWM調制、載波移相PWM調制和NLM調制等MMC調制策略,并構造了橋臂能量和控制器及橋臂能量差控制器來控制子模塊電容電壓的平衡。本文接著研究了電網不平衡條件下MMC的控制策略。對三相MMC的一相建立了等效電路模型并進行了數(shù)學分析,分析了電網不平衡時MMC的工作特性,然后研究了電網不平衡時MMC的控制策略,主要對比分析了三種控制方法：基于dq同步旋轉坐標系的控制方法、基于PR調節(jié)器的控制方法、基于準PR調節(jié)器的控制方法,并搭建了MATLAB/Simulink仿真模型進行驗證。最后設計并搭建了基于分層思想的三相MMC實驗平臺,具體包括：MMC硬件系統(tǒng)設計和軟件控制系統(tǒng)設計。其中硬件系統(tǒng)設計包括主電路設計及主控制器(DSP)、橋臂控制器(FPGA)、子模塊控制器(CPLD)的設計,DSP、FPGA、 CPLD構成了MMC的三層控制系統(tǒng)。軟件控制系統(tǒng)設計包括上述三層控制器的軟件設計。在此實驗平臺的基礎上,進行了基于直接調制法和子模塊電容電壓排序法的開環(huán)實驗,實驗結果表明了方案的可行性。
[Abstract]:In recent years, with the development of power electronics technology, high-voltage high-power power electronic equipment is widely used in the power system of flexible AC transmission, high-voltage direct current transmission, static reactive power compensation and other occasions. It can effectively improve the system power quality and transmission and distribution system efficiency. With the rapid development of new energy. Flexible direct current transmission technology will play a very important role in the future development of power grid in China. In the flexible direct current transmission project, the multilevel converter has low harmonic content due to its output waveform. Power devices with low voltage stress are more and more used in high-voltage and high-power fields. Among many multilevel topologies, modularized multilevel topology (MMCs) is easy to expand because of its modularization. Good redundancy, low output harmonics and low switching frequency of power devices make it a hot research topic in recent years. Firstly, the topology and working principle of MMC are analyzed in this paper. The relationship between upper and lower arm voltage, output AC voltage, upper and lower arm current, circulation and AC output current during normal operation of MMC is analyzed and deduced. The capacitive voltage balance technology is described in detail, and the strategies of carrier stacked PWM modulation, carrier phase-shifted PWM modulation and NLM modulation are analyzed in detail. The bridge arm energy and controller and the bridge arm energy difference controller are constructed to control the capacitor voltage balance of the submodule. Then, the control strategy of MMC under the unbalanced power grid is studied. The one-phase construction of the three-phase MMC is established. The equivalent circuit model and mathematical analysis are carried out. This paper analyzes the working characteristics of MMC when the power network is unbalanced, and then studies the control strategy of MMC when the power network is unbalanced. Three control methods are compared and analyzed: the control method based on DQ synchronous rotating coordinate system. The control method based on PR regulator and the control method based on quasi-PR regulator. Finally, a three-phase MMC experimental platform based on layered theory is designed and built. The hardware system design includes the main circuit design and the main controller DSPG, the bridge arm controller and the FPGA. the hardware system design includes the hardware system design and the software control system design of the MMC, including the main circuit design and the main controller DSPG, the bridge arm controller. The design of submodule controller (CPLD) is based on DSP FPGA. CPLD is the three-layer control system of MMC. The software control system design includes the software design of the three-layer controller mentioned above. On the basis of this experimental platform. The open loop experiment based on direct modulation method and capacitor voltage sort method of sub-module is carried out. The experimental results show the feasibility of the scheme.
【學位授予單位】：合肥工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TM46

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