特高压直流输电控制系统模型的研究

发布时间：2018-02-27 14:02

本文关键词： 特高压直流输电控制系统 RTDS 仿真　出处：《北京交通大学》2015年硕士论文　论文类型：学位论文

【摘要】：特高压直流输电因具有输电距离远、容量大、控制灵活、电能损耗小和节约土地等特点,在我国西电东送和市场资源配置中发挥着越来越重要的作用,其安全运行对保障电力系统稳定和国民经济健康发展具有重大意义。到2020年左右,我国将建成15个±800kV特高压直流输电工程并接入国内电网,包含约30座特高压换流站和长约26000km的输电线路,输送容量达94400MW,形成覆盖华北、华中、华东地区的特高压交直流并列运行同步电网。特高压直流输电工程不断建成投运,交、直流日趋紧密的联系使得电网结构更加复杂,因此对特高压直流输电系统的可靠性和控制性提出了更高的要求。控制系统是直流输电工程的大脑,要做好特高压直流输电系统的研究,就必须建立准确的控制系统仿真模型。特高压直流输电是在常规高压直流输电的基础上发展起来的,其控制系统的基本原理和特性与常规高压直流相似。本文详细介绍了特高压直流输电控制系统的分层结构和模块功能,对双极控制和极控制功能进行了简化,以RTDS仿真软件为平台,搭建了以阀组控制为核心的极值选择型控制系统模型。该模型不仅能够充分反映特高压直流控制系统的控制特性,而且对冗余部分的简化可以加快仿真速度,也便于理解。本文通过仿真验证了直流系统稳态运行时的各项参数符合设计要求,又分别在整流侧出口直流线路单相接地、整流侧交流系统单相接地和逆变侧交流系统三相短路这三种故障情况下,对所建控制系统的响应特性进行仿真分析,结果表明模型响应合理可靠。本文的研究成果对于深入开展研究国内特高压直流控制系统和交直流混合暂态仿真具有重要意义。
[Abstract]:Because of its long transmission distance, large capacity, flexible control, low power loss and land saving, UHVDC is playing an increasingly important role in the distribution of electricity from west to east and the allocation of market resources in China. Its safe operation is of great significance to ensure the stability of power system and the healthy development of national economy. By 2020, 15 卤800kV UHVDC transmission projects will be built and connected to the domestic power network in China. It contains about 30 UHV converter stations and 26000km long transmission lines with a transmission capacity of 94400MW, forming a synchronous UHV AC / DC network covering North China, Central China and East China. UHV HVDC transmission projects are constantly built and put into operation, and the increasingly close relationship between AC and DC makes the power network structure more complex. Therefore, higher requirements are put forward for the reliability and controllability of UHVDC transmission system, which is the brain of HVDC project. In order to do well the research of UHV HVDC system, it is necessary to establish an accurate simulation model of control system. UHV DC transmission is developed on the basis of conventional HVDC transmission. The basic principle and characteristics of the control system are similar to those of conventional HVDC. The layered structure and module function of UHVDC control system are introduced in detail, and the bipolar control and pole control functions are simplified. On the platform of RTDS simulation software, a model of extreme value selective control system with valve group control as the core is built. The model can not only fully reflect the control characteristics of UHV DC control system. Moreover, the simplification of redundant parts can accelerate the speed of simulation and is easy to understand. In this paper, the simulation results show that the parameters of the DC system meet the design requirements, and the DC line is grounded at the outlet of the rectifier side. In the case of single-phase grounding of rectifier AC system and three-phase short circuit of inverter AC system, the response characteristics of the established control system are simulated and analyzed. The results show that the model response is reasonable and reliable, and the research results in this paper are of great significance for the in-depth study of UHVDC control systems and AC / DC hybrid transient simulation in China.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM721.1

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