本文選題：電壓源換流器 + 系統(tǒng)穩(wěn)定性��； 參考：《南京理工大學(xué)》2014年碩士論文

【摘要】：隨著現(xiàn)代電力系統(tǒng)規(guī)模的逐漸增大,網(wǎng)絡(luò)日趨復(fù)雜,遠距離、大容量的輸電與各個大區(qū)域之間的電網(wǎng)進行異步互聯(lián),城市配電網(wǎng)的發(fā)展與環(huán)境保護等問題將會日益嚴重。而采用電壓源換流器的柔性直流輸電技術(shù),可以進行無源逆變,不存在換相失敗,故在交直流混合輸電系統(tǒng)中不存在因換相失敗而引起輸送功率中斷威脅整個系統(tǒng)穩(wěn)定性。VSC換流器能穩(wěn)定獨立控制線路傳輸?shù)挠泄Αo功功率,類似靜止同步補償器提供無功補償,來向交流系統(tǒng)提供緊急無功支援。因此對VSC-HVDC的研究將對改善交直流混合配電網(wǎng)電能質(zhì)量并提高其供電靈活性、可靠性等方面有著重要意義。 針對傳統(tǒng)直流輸電的不足,采用了多重化、三層次的結(jié)構(gòu)設(shè)計VSC-HVDC的控制體系。建立了含VSC-HVDC的交直流系統(tǒng)的數(shù)學(xué)模型,利用雙環(huán)PI調(diào)節(jié)的控制策略設(shè)計了內(nèi)環(huán)電流控制器與外環(huán)控制器,解耦后的dq軸電流可以控制系統(tǒng)的有功與無功分量,并利用電壓斜率控制改進外環(huán)控制器�；贛ATLAB平臺搭建了柔性直流輸電仿真模型,仿真研究了兩端有源網(wǎng)絡(luò)的功率傳輸和向無源網(wǎng)絡(luò)供電的工程狀況。結(jié)果表明：設(shè)計的系統(tǒng)可以對有功與無功功率進行準確、獨立控制且兩個換流站之間不需要通信。電網(wǎng)電壓跌落過大時VSC閥的過電流保護能控制換流站傳輸功率降額運行,直流電壓斜率控制器可以抑制故障下電壓波動。在交直流混合網(wǎng)絡(luò)中,對電力系統(tǒng)穩(wěn)定器進行了參數(shù)優(yōu)化,并利用VSC的無功補償能力提高混合系統(tǒng)穩(wěn)定性。結(jié)果表明：參數(shù)優(yōu)化后發(fā)電機的轉(zhuǎn)速與功角能迅速穩(wěn)定,同時聯(lián)絡(luò)線上的功率搖擺對直流輸電線路沒有影響,VSC能穩(wěn)定控制直流傳輸?shù)墓β?若利用柔性直流異步互聯(lián)可以根除系統(tǒng)的低頻振蕩。
[Abstract]:With the increasing scale of modern power system, the network is becoming more and more complex, long-distance, large capacity of transmission and each large area of the power grid asynchronous interconnection, the development of urban distribution network and environmental protection will become increasingly serious. The flexible DC transmission technology using voltage source converter can carry out passive inverter, and there is no commutation failure. Therefore, in AC-DC hybrid transmission system, there is no transmission power interruption caused by commutation failure, which threatens the stability of the whole system. VSC converter can stabilize the active power and reactive power of independent control line transmission. A static synchronous compensator provides reactive power compensation to provide emergency reactive power support to AC systems. Therefore, the research on VSC-HVDC will be of great significance in improving the power quality of AC / DC hybrid distribution network and improving its power supply flexibility and reliability. Aiming at the deficiency of traditional DC transmission, the control system of VSC-HVDC is designed with multi-level and three-level structure. The mathematical model of AC / DC system with VSC-HVDC is established. The inner loop current controller and the outer loop controller are designed by using the control strategy of double loop Pi regulation. The decoupled dq axis current can control the active and reactive power components of the system. The outer loop controller is improved by voltage slope control. The simulation model of flexible direct current transmission is built based on MATLAB platform. The power transmission and power supply to passive network are simulated and studied. The results show that the designed system can control the active and reactive power accurately and independently and there is no need for communication between the two converter stations. The overcurrent protection of VSC valve can control the power drop operation of converter station when the voltage drop is too large. The DC voltage slope controller can restrain the voltage fluctuation under the fault. The parameters of power system stabilizer are optimized in AC / DC hybrid network, and the stability of hybrid system is improved by using the reactive power compensation ability of VSC. The results show that the rotation speed and power angle of the generator can be quickly stabilized after parameter optimization, and the power swing on the tie-line has no effect on the power of HVDC transmission line, and the VSC can control the power of DC transmission stably. If the flexible DC asynchronous interconnection is used, the low frequency oscillation of the system can be eliminated.
【學(xué)位授予單位】：南京理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM721.3

【參考文獻】

相關(guān)期刊論文 前10條

1 朱奕帆;;柔性直流輸電技術(shù)在風電并網(wǎng)中的應(yīng)用[J];華東電力;2011年07期

2 喬衛(wèi)東;毛穎科;;上海柔性直流輸電示范工程綜述[J];華東電力;2011年07期

3 解大;解蕾;張延遲;艾芊;;連接海上風電場的基于直接功率控制的三電平VSC-HVDC[J];電力系統(tǒng)保護與控制;2010年14期

4 胡浩;;柔性直流輸電技術(shù)及其國內(nèi)應(yīng)用展望[J];華東電力;2011年09期

5 楊方;張義斌;葛旭波;劉林;尹明;;德國海上風電VSC-HVDC技術(shù)分析[J];電網(wǎng)與清潔能源;2012年10期

6 劉建濤;曾丹;姚建國;楊勝春;王珂;;柔性直流輸電換流器經(jīng)濟性分析[J];現(xiàn)代電力;2012年03期

7 張桂斌,徐政,王廣柱;基于VSC的直流輸電系統(tǒng)的穩(wěn)態(tài)建模及其非線性控制[J];中國電機工程學(xué)報;2002年01期

8 尹明,李庚銀,牛同義,李廣凱,梁海峰,周明;VSC-HVDC連續(xù)時間狀態(tài)空間模型及其控制策略研究[J];中國電機工程學(xué)報;2005年18期

9 潘武略;徐政;張靜;王超;;電壓源換流器型直流輸電換流器損耗分析[J];中國電機工程學(xué)報;2008年21期

10 張文亮;湯廣福;查鯤鵬;賀之淵;;先進電力電子技術(shù)在智能電網(wǎng)中的應(yīng)用[J];中國電機工程學(xué)報;2010年04期

相關(guān)博士學(xué)位論文 前1條

1 張靜;VSC-HVDC控制策略研究[D];浙江大學(xué);2009年

，

本文編號：1912254