本文選題：MMC + UPFC　； 參考：《華北電力大學(xué)(北京)》2017年碩士論文

【摘要】：基于模塊化多電平換流器(modular multilevel converter,MMC)的統(tǒng)一潮流控制器(unified power flow controller,UPFC)是適應(yīng)高電壓大容量輸電的高度可控型靈活交流輸電系統(tǒng)裝置,其構(gòu)成復(fù)雜,故障影響不容忽視,對(duì)接地設(shè)計(jì)及保護(hù)策略要求高。本文以基于MMC的UPFC接地方式及本體保護(hù)策略為核心,圍繞MMC-UPFC本體保護(hù)配置及配合、接地方式對(duì)故障特性及本體保護(hù)的影響、UPFC接入對(duì)系統(tǒng)保護(hù)的影響這三個(gè)部分開展研究。首先,本文介紹基于MMC的UPFC本體結(jié)構(gòu)、工作原理及詳細(xì)保護(hù)區(qū)域劃分;結(jié)合上海MMC-UPFC示范工程進(jìn)行仿真實(shí)驗(yàn),考慮閥控制保護(hù)影響,重點(diǎn)分析了幾種典型故障下的故障特性,指出傳統(tǒng)保護(hù)可能存在的問題。并針對(duì)上述問題,改進(jìn)了并聯(lián)閥側(cè)短引線差動(dòng)保護(hù),T接線差動(dòng)保護(hù)及串聯(lián)變壓器差動(dòng)保護(hù)。其次,針對(duì)接地方式對(duì)故障特性與本體保護(hù)的影響,提出三種可行的交流側(cè)接地方式,分別為僅并聯(lián)變閥側(cè)中性點(diǎn)經(jīng)大電阻接地,僅串聯(lián)變閥側(cè)中性點(diǎn)經(jīng)大電阻接地及僅并聯(lián)變閥側(cè)中性點(diǎn)經(jīng)小電阻接地。進(jìn)一步,結(jié)合示范工程系統(tǒng)參數(shù)與RTDS實(shí)時(shí)數(shù)字仿真實(shí)驗(yàn),詳細(xì)分析不同接地方式對(duì)故障特性與保護(hù)配置的影響,重點(diǎn)討論接地點(diǎn)位置對(duì)串聯(lián)變網(wǎng)側(cè)單相接地故障及對(duì)應(yīng)保護(hù)配置影響,接地電阻阻值對(duì)閥側(cè)短引線單相接地故障、換流器橋臂單相接地故障及相應(yīng)保護(hù)配置影響,最終得出MMC-UPFC較優(yōu)的接地方案。最后,針對(duì)UPFC接入對(duì)系統(tǒng)保護(hù)的影響,本文給出UPFC本體保護(hù)與系統(tǒng)保護(hù)的配合,根據(jù)示范工程實(shí)際需要,明確本體保護(hù)與系統(tǒng)保護(hù)的動(dòng)作范圍。進(jìn)一步,將UPFC模型簡化等效并仿真分析UPFC接入對(duì)故障特性的影響,搭建距離保護(hù)計(jì)算模型,比較UPFC不同接入地點(diǎn)、不同故障位置,距離保護(hù)不同原理情況下,線路首端保護(hù)安裝處測量電阻、測量電抗及距離保護(hù)動(dòng)作情況,分析UPFC接入對(duì)線路距離保護(hù)的影響。
[Abstract]:The unified power flow controller based on modular multilevel converter (Modular multilevel convertor) is a highly controllable flexible AC transmission system for high voltage and large capacity transmission. Its structure is complex and the fault influence can not be ignored.High requirements for grounding design and protection strategy.This paper focuses on the UPFC grounding mode and the protection strategy based on MMC. It focuses on the configuration and cooperation of the MMC-UPFC ontology protection, the influence of the grounding mode on the fault characteristics and the impact of the MMC-UPFC access on the system protection.First of all, this paper introduces the structure, working principle and detailed protection area division of UPFC based on MMC, and analyzes the fault characteristics of several typical faults based on the simulation experiment of Shanghai MMC-UPFC demonstration project, considering the influence of valve control protection.The possible problems of traditional protection are pointed out.Aiming at the above problems, this paper improves the parallel valve side short lead differential protection and the series transformer differential protection.Secondly, in view of the influence of grounding mode on fault characteristics and body protection, three feasible AC side grounding methods are put forward, namely, only the neutral point of the side of the parallel variable valve is grounded by large resistance.Only the neutral point on the side of the series variable valve is grounded by large resistance and only the neutral point of the side of the parallel variable valve is grounded with small resistance.Furthermore, the effects of different grounding modes on fault characteristics and protection configuration are analyzed in detail by combining the system parameters of the demonstration project and the real-time digital simulation experiment of RTDS.This paper mainly discusses the influence of grounding point position on single-phase grounding fault and corresponding protection configuration of series transformer grid, the influence of grounding resistance value on valve side short lead single-phase grounding fault, commutator bridge arm single-phase grounding fault and corresponding protection configuration.Finally, the optimal grounding scheme of MMC-UPFC is obtained.Finally, aiming at the influence of UPFC access on system protection, this paper presents the cooperation of UPFC ontology protection and system protection. According to the actual needs of demonstration project, the scope of action between ontology protection and system protection is defined.Furthermore, the UPFC model is simplified and equivalent, and the influence of UPFC access on fault characteristics is simulated and analyzed. A distance protection calculation model is built to compare the different access locations, different fault locations and different principles of distance protection in UPFC.The resistance, reactance and distance protection action are measured at the first end of the line protection installation, and the influence of UPFC access on the line distance protection is analyzed.
【學(xué)位授予單位】：華北電力大學(xué)(北京)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM761;TM77

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