【作者】 胡景瑜；

【导师】 李群湛；

【作者基本信息】 西南交通大学 ， 电力系统及其自动化， 2013， 硕士

【摘要】 现行电气化铁路供电系统存在谐波、负序和无功等电能质量问题,牵引网电分相直接影响着机车重载运行。为解决以上问题提出了多种改善和解决方案,前期的无源对称补偿技术对一系列电能质量问题进行了改善,但想从根本上解决有一定难度,依然存在电分相,之后提出的基于SVG的同相供电方案能很好地解决上述问题,取消了变电所出口处电分相,但没有取消分区所处电分相。基于将牵引供电系统和公共电网实现隔离的想法,从根本上解决上述问题,贯通式同相供电方案应运而生。贯通式同相供电系统前期研究主要是综合潮流控制器的建模与仿真,本文则对此方案中潮流控制做了更系统的研究。首先,本文研究了组成潮流控制器的基本模块交-直-交变流器,对其进行了的建模与仿真,并在以往控制基础上对单相逆变侧的控制策略进行了改进。然后,本文研究了变电所内部交-直-交变流器的并联冗余,分析多种控制方法后采用集中式控制和分布式控制分别对变流器并联系统进行了仿真分析,并对结果进行了对比分析。最后,本文研究了变电所之间并网控制策略,比较几种控制策略后,采用下垂控制与倒下垂控制相结合的控制策略,对四个变电所模块并联系统进行了建模与仿真。采用下垂控制的变电所为负载供电的同时提供系统电压,采用倒下垂控制的变电所支持系统电压并能够控制其输出功率,做到变电所容量限定。最后使用MATLAB/Simulink软件对.上述电路建模并进行了仿真分析,实验结果表明,在本文潮流控制策略下,各变电所模块之间能够顺利并网实现贯通式同相供电,在自然潮流分布的基础上,在控制策略中加入了变电所模块的容量限定,能很好的实现变电所限容的目的,验证了该潮流控制策略的可行性。更多还原

【Abstract】 Negative sequence, harmonics and reactive power are problems exist in railway Power supply, seriously affecting the development of high-speed and high-load railway., a variety of improvements and solutions have been proposed to solve these problems. Such as the pre-passive symmetrical compensation technology, it was able to improve the above-mentioned power quality problems, but it is difficult to fundamentally solve. The problem is the electric phase separation still exists. The co-phase traction power supply system based on the SVG can solve the above problems, it has been put into trial operation and proven to minimize those problems, and it has electric phase break.Reference to the results of previous studies, this paper focuses on doing a further study of the co-phase connected power supply system, and proposed a suitable flow control strategy. Currently the study of the co-phase connected power supply system is to model and simulate the integrated power flow controller. On this basis, this paper made a research and analysis on the AC-DC-AC converter’s operating in parallel and used two control strategies to model and simulate it. In addition, this paper made a research and analysis on the substation’s operating in parallel. The integrated method of controlling adopt the combination of droop control and inverse droop control, the substation used droop control to keep the system voltage,which used inverse droop control to support the system voltage and is able to control its output power, the substation’s capacity can be limited. Using two different control strategies improved the stability of the system, and ensure the stability of the system can be better when the system failure or shock. With establishing and analyzing the simulation model of co-phase connected power supply system by MATLAB, both dynamic and steady performances of the system, which controlled by the synthetic control strategy, have been proved well.更多还原