本文選題：多直流落點(diǎn)系統(tǒng) + 換相失敗��； 參考：《華南理工大學(xué)》2014年碩士論文

【摘要】：直流輸電本身所具有的經(jīng)濟(jì)性、高度可控及快速可調(diào)的特性，使其在遠(yuǎn)距離、大容量輸電和區(qū)域電力系統(tǒng)聯(lián)網(wǎng)等方面應(yīng)用廣泛，并逐漸形成了交直流輸電并聯(lián)運(yùn)行、多回直流集中饋入受端系統(tǒng)的復(fù)雜電網(wǎng)，以我國(guó)南方電網(wǎng)尤為典型。對(duì)于多直流落點(diǎn)系統(tǒng)，換相失敗是交直流相互作用下最為典型的問題。至2015年溪洛渡和糯扎渡直流工程投產(chǎn)后，南方電網(wǎng)在“十二五”期間將形成更為復(fù)雜的多直流落點(diǎn)系統(tǒng)，某些嚴(yán)重故障可能會(huì)引起南方電網(wǎng)受端八回直流輸電逆變器同時(shí)發(fā)生換相失敗，多回直流輸電逆變器的換相失敗特性與功率恢復(fù)特性對(duì)受端電網(wǎng)的安全穩(wěn)定運(yùn)行至關(guān)重要。因此對(duì)多直流落點(diǎn)系統(tǒng)進(jìn)行詳細(xì)地電磁暫態(tài)建模，通過(guò)仿真的方法研究直流換相失敗及恢復(fù)特性非常必要。 本文首先分析了換相失敗的機(jī)理及影響換相失敗和功率恢復(fù)過(guò)程的主要因素；使用PSCAD/EMTDC仿真軟件，以糯扎渡±800kV特高壓直流工程為例，研究逆變側(cè)換流母線電壓變化、逆變側(cè)交流系統(tǒng)強(qiáng)度及低壓限流控制（VDCOL）對(duì)換相失敗及功率恢復(fù)特性的影響。 針對(duì)大規(guī)模交直流電網(wǎng)電磁暫態(tài)仿真精確初始穩(wěn)態(tài)難以確定的問題，提出了一種EMTDC快速建模調(diào)試方法，通過(guò)分區(qū)建模調(diào)試的思想將大電網(wǎng)建模問題轉(zhuǎn)化成小電網(wǎng)進(jìn)行解決，使建模效率及模型準(zhǔn)確度大大提高。對(duì)南方電網(wǎng)“兩渡”直流投產(chǎn)后的2015水平年豐大規(guī)劃方式數(shù)據(jù)進(jìn)行了動(dòng)態(tài)等值，，采用上述方法對(duì)等值后系統(tǒng)建立了含全部8回直流詳細(xì)模型及500kV主網(wǎng)架的交直流大電網(wǎng)PSCAD/EMTDC電磁暫態(tài)仿真模型。 對(duì)2015年南方電網(wǎng)多直流落點(diǎn)系統(tǒng)換相失敗特性進(jìn)行了詳細(xì)地EMTDC仿真分析，通過(guò)對(duì)受端主要500kV站點(diǎn)出線進(jìn)行故障掃描確定了可能引起多回直流同時(shí)換相失敗的站點(diǎn)，并重點(diǎn)對(duì)直流逆變站出線典型故障下各直流的響應(yīng)特性及恢復(fù)過(guò)程進(jìn)行了分析。最后對(duì)南方電網(wǎng)受端系統(tǒng)500kV北郊站、水鄉(xiāng)站和木棉站分別配置±200Mvar靜止同步補(bǔ)償器（STATCOM）裝置對(duì)多直流落點(diǎn)系統(tǒng)換相失敗及恢復(fù)特性的影響進(jìn)行了仿真分析。
[Abstract]:Because of its economical, highly controllable and fast adjustable characteristics, DC transmission has been widely used in long-distance, large-capacity transmission and regional power system networking, and has gradually formed a parallel operation of AC / DC transmission. The complex power grid with multiple DC centralized feed into the receiver system is especially typical in China Southern Power Grid. Commutation failure is the most typical problem under AC / DC interaction for multiple DC drop point systems. By 2015, when the Xiluodu and Nuozhadu DC projects are put into operation, the Southern Power Grid will form a more complex multi-DC landing point system during the 12th Five-Year Plan period. Some serious faults may cause commutative failure of the eight-circuit DC inverter at the receiving end of Southern Power Grid. The commutation failure characteristics and power recovery characteristics of the multi-circuit DC inverter are very important for the safe and stable operation of the receiving power network. Therefore, it is necessary to study the DC commutation failure and recovery characteristics through the detailed electromagnetic transient modeling of multi-DC drop point system. In this paper, the mechanism of commutation failure and the main factors influencing the process of commutation failure and power recovery are analyzed firstly, and the voltage variation of inverter side commutation bus is studied by using PSCAD / EMTDC simulation software, taking Nuozhadu 鹵800kV UHV DC project as an example. The effect of inverter side AC system strength and low voltage current limiting control (VDCOL) on commutation failure and power recovery characteristics. In order to solve the problem that the accurate initial steady-state of electromagnetic transient simulation of large-scale AC / DC power network is difficult to determine, an EMTDC fast modeling and debugging method is proposed, which transforms the modeling problem of large power grid into a small power grid through the idea of zoning modeling and debugging. The efficiency and accuracy of modeling are greatly improved. In this paper, the dynamic equivalence of the 2015 level annual Fengda planning method data after the "two Dudu" DC operation in Southern Power Grid has been carried out. Using the above method, the electromagnetic transient simulation model of PSCAD / EMTDC for large AC / DC power grid with all 8 times DC detailed model and 500 kV main grid is established. A detailed EMTDC simulation analysis on the commutation failure characteristics of multi-DC drop point system in Southern Power Grid in 2015 is carried out. Through fault scanning of the main 500kV station at the receiving end, the stations that may cause multiple DC commutation failures are determined. The response characteristics and recovery process of each DC under typical fault of DC inverter station are analyzed. Finally, the effect of 鹵200Mvar static synchronous compensator (+ 200Mvar) on commutation failure and recovery characteristics of 500kV northern suburb station, water station and kapok station of Southern Power Grid is simulated.
【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM721.1

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