基于多电平技术的统一潮流控制器研究

发布时间：2018-03-05 10:04

本文选题：统一潮流控制器(UPFC)　切入点：分组多重化技术　出处：《中原工学院》2017年硕士论文　论文类型：学位论文

【摘要】：随着全球能源互联网的逐步推进以及市场经济的飞速发展,电力需求也日益增长,现有电力系统输电能力不足的矛盾也日益凸显,而建立新的传输线路受到土地、环境、成本等诸多客观因素的限制而难以给予实施。因此,柔性交流输电系统(FACTS)应运而生,并愈发受到人们关注。统一潮流控制器(UPFC)作为柔性交流输电系统中最具代表性、功能最强大的串、并联综合补偿装置成为研究的热点。本文在分析UPFC的拓扑结构、工作原理和数学模型的基础之上,分别对基于三电平换流装置的UPFC(TNPC-UPFC)、基于MMC结构的UPFC(MMC-UPFC)这两种采用多电平技术的UPFC进行详细的研究与分析。主要做的工作如下:1)介绍了电网中潮流控制的基本概念和基本方法,对UPFC的整体拓扑结构进行详细的阐述,介绍了UPFC的数学模型及控制策略,在给出UPFC的数学模型之前还简要介绍了坐标变换理论和pq理论,该两大理论是研究UPFC数学模型和控制策略的基础,然后对电力PLL进行分析,并给出仿真模型,接着对UPFC串、并联侧建立动态数学模型,并给出相应的控制策略。2)对基于分组多重化技术的UPFC进行设计与详细的分析和研究,分别对并联侧TNPC-STATCOM、串联侧TNPC-SSSC的控制策略进行详细分析,并在Matlab/2016b仿真环境下建立仿真模型。接着研究分析了MMC-UPFC,还给出MMC-UPFC并联侧的仿真模型。并对仿真结果进行详细分析,得出UPFC强大的有功和无功潮流控制能力。3)对MMC型换流器实验样机的设计和电路中相关元件参数选取进行了介绍。从MMC型换流器实验样机的子模块设计入手,给出子模块电容参数选取的计算公式,然后又对桥臂电抗器参数的选取对比公式,接着对MMC型换流器实验样机的控制系统设计做了整体上的阐述。
[Abstract]:With the gradual advancement of the global energy Internet and the rapid development of the market economy, the demand for electricity is also growing day by day, and the contradiction of the insufficient transmission capacity of the existing power system is becoming increasingly prominent, and the establishment of new transmission lines is subject to the land and environment. Because of the limitation of cost and many other objective factors, it is difficult to implement it. Therefore, facts (flexible AC Transmission system) emerges as the times require, and gets more and more attention. UPFC (Unified Power flow Controller) is the most representative of the flexible AC transmission system. The most powerful serial and parallel compensation devices have become the focus of research. This paper analyzes the topological structure, working principle and mathematical model of UPFC. Two kinds of UPFC which are based on three-level converter, TNPC-UPFCN and MMC structure, are studied and analyzed in detail. The main work is as follows: 1) the basic concept and method of power flow control in power network are introduced. The overall topological structure of UPFC is described in detail, and the mathematical model and control strategy of UPFC are introduced. Before the mathematical model of UPFC is given, the coordinate transformation theory and PQ theory are briefly introduced. These two theories are the basis of studying UPFC mathematical model and control strategy. Then the power PLL is analyzed, and the simulation model is given. Then, the dynamic mathematical model of UPFC serial and parallel side is established. The corresponding control strategy is given. (2) the design and research of UPFC based on grouping multiple technology are carried out, and the control strategies of TNPC-STATCOMand TNPC-SSSC on the parallel side are analyzed in detail, respectively. Then, the simulation model of MMC-UPFC is analyzed, and the simulation model of MMC-UPFC parallel side is given. The simulation results are analyzed in detail. It is concluded that UPFC has powerful active and reactive power flow control ability. (3) the design of the experimental prototype of MMC converter and the selection of related component parameters in the circuit are introduced. The sub-module design of the experimental prototype of MMC converter is introduced. The calculation formula of capacitance parameter selection of submodule is given, and then the comparison formula of bridge arm reactor parameter selection is given. Then, the control system design of MMC converter experimental prototype is described as a whole.
【学位授予单位】：中原工学院
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM761

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