本文關(guān)鍵詞： 特高壓直流輸電 控制系統(tǒng) RTDS 仿真　出處：《北京交通大學》2015年碩士論文　論文類型：學位論文

【摘要】：特高壓直流輸電因具有輸電距離遠、容量大、控制靈活、電能損耗小和節(jié)約土地等特點,在我國西電東送和市場資源配置中發(fā)揮著越來越重要的作用,其安全運行對保障電力系統(tǒng)穩(wěn)定和國民經(jīng)濟健康發(fā)展具有重大意義。到2020年左右,我國將建成15個±800kV特高壓直流輸電工程并接入國內(nèi)電網(wǎng),包含約30座特高壓換流站和長約26000km的輸電線路,輸送容量達94400MW,形成覆蓋華北、華中、華東地區(qū)的特高壓交直流并列運行同步電網(wǎng)。 特高壓直流輸電工程不斷建成投運,交、直流日趨緊密的聯(lián)系使得電網(wǎng)結(jié)構(gòu)更加復(fù)雜,因此對特高壓直流輸電系統(tǒng)的可靠性和控制性提出了更高的要求�？刂葡到y(tǒng)是直流輸電工程的大腦,要做好特高壓直流輸電系統(tǒng)的研究,就必須建立準確的控制系統(tǒng)仿真模型。 特高壓直流輸電是在常規(guī)高壓直流輸電的基礎(chǔ)上發(fā)展起來的,其控制系統(tǒng)的基本原理和特性與常規(guī)高壓直流相似。本文詳細介紹了特高壓直流輸電控制系統(tǒng)的分層結(jié)構(gòu)和模塊功能,對雙極控制和極控制功能進行了簡化,以RTDS仿真軟件為平臺,搭建了以閥組控制為核心的極值選擇型控制系統(tǒng)模型。該模型不僅能夠充分反映特高壓直流控制系統(tǒng)的控制特性,而且對冗余部分的簡化可以加快仿真速度,也便于理解。 本文通過仿真驗證了直流系統(tǒng)穩(wěn)態(tài)運行時的各項參數(shù)符合設(shè)計要求,又分別在整流側(cè)出口直流線路單相接地、整流側(cè)交流系統(tǒng)單相接地和逆變側(cè)交流系統(tǒng)三相短路這三種故障情況下,對所建控制系統(tǒng)的響應(yīng)特性進行仿真分析,結(jié)果表明模型響應(yīng)合理可靠。本文的研究成果對于深入開展研究國內(nèi)特高壓直流控制系統(tǒng)和交直流混合暫態(tài)仿真具有重要意義。
[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 鹵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.
【學位授予單位】：北京交通大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TM721.1

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