鏈?zhǔn)絊TATCOM在不平衡工況下的控制策略研究
[Abstract]:Chain structure STATCOM has many advantages, such as small volume, low cost and easy redundancy. In this paper, the main circuit of chain STATCOM and its control strategy are studied, especially under the unbalanced condition of power network. Firstly, the research status of DC capacitive voltage balance control and chain STATCOM control under unbalanced condition is summarized. The mathematical model of decoupling control in d-q synchronous rotating coordinate system is established by analyzing the main circuit structure of chain type STATCOM and its operating principle. The steady state operation characteristics of the decoupling control system under the condition of voltage balance are obtained. Secondly, in order to give full play to the advantage of easy redundancy of chain STATCOM, a general simulation model with adjustable chain number of chain STATCOM is built, and the control strategy is designed to adapt to different voltage levels. The influence of the change of chain node on the selection of chain STATCOM parameters is analyzed, which provides the basis for parameter selection. Then, according to the topological structure and working model of chain STATCOM, the control strategy design in balanced system is discussed in detail. In order to realize DC capacitor voltage equalization control, a hierarchical coordinated control method is adopted. The upper control adopts the voltage and current double loop control based on direct current decoupling control, and the lower control adopts the two-stage voltage stabilizer and the improved nearest level approximation method. Through the coordinated control of the upper and lower layers of the system, the transfer of reactive power of the device and the system and the equalization of the DC capacitor voltage of each link are finally realized. The simulation model is built in PSCAD to verify it. Finally, this paper analyzes the operation characteristics of chain STATCOM in unbalanced system, establishes mathematical model, improves the control strategy of positive and negative sequence double current inner loop, and balances the power of three-phase commutation chain by introducing controllable negative sequence current. The negative sequence current reference value can quickly track the imbalance between inside and outside of the device, which solves the problem of over-current and voltage imbalance of the chain STATCOM device under the unbalanced condition of the system. The model is simulated in PSCAD, and different unbalance conditions are simulated by controlling the unbalance degree of negative sequence voltage. The negative sequence reference current is stable in 200ms, and the balance effect of three-phase commutation chain is remarkable. To a certain extent can meet the fan into the network imbalance demand. The simulation results show that the device can still not quit operation and has a certain reactive power compensation ability when the unbalance reaches 50.
【學(xué)位授予單位】:北京交通大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:TM761.12
【參考文獻(xiàn)】
相關(guān)期刊論文 前10條
1 謝天才;張玉娟;張君泉;王眾全;;級聯(lián)多電平STATCOM直流側(cè)電容電壓穩(wěn)定性分析[J];機(jī)電工程;2016年08期
2 邊曉燕;田春筍;符楊;;提高雙饋風(fēng)電機(jī)組高電壓穿越能力的控制策略[J];電機(jī)與控制應(yīng)用;2016年02期
3 田桂珍;王生鐵;龐洋;;電壓不平衡下籠型機(jī)風(fēng)電場STATCOM控制策略的研究[J];可再生能源;2016年01期
4 馮宇鵬;王先為;吳金龍;王林;左廣杰;潘愛強(qiáng);;基于負(fù)序電流前饋的星型鏈?zhǔn)絊TATCOM鏈間均壓策略[J];電網(wǎng)技術(shù);2016年05期
5 張揚(yáng);吳金龍;高志軍;姚為正;;高壓鏈?zhǔn)絊TATCOM的最近電平調(diào)制策略研究[J];智能電網(wǎng);2014年08期
6 王松;談龍成;李耀華;王平;宋鵬先;任洪濤;;鏈?zhǔn)叫切蜸TATCOM補(bǔ)償不平衡負(fù)載的控制策略[J];中國電機(jī)工程學(xué)報;2013年27期
7 鮑薇;胡學(xué)浩;何國慶;李光輝;;分布式電源并網(wǎng)標(biāo)準(zhǔn)研究[J];電網(wǎng)技術(shù);2012年11期
8 宮力;康勇;陳晶晶;黃云輝;戴珂;;鏈?zhǔn)絊TATCOM直流電容電壓分布式控制[J];電工技術(shù)學(xué)報;2011年10期
9 江道灼;張振華;;三相H橋級聯(lián)靜止同步補(bǔ)償器的控制策略[J];高電壓技術(shù);2011年08期
10 吉正華;韋芬卿;楊海英;;基于dq變換的三相軟件鎖相環(huán)設(shè)計[J];電力自動化設(shè)備;2011年04期
相關(guān)博士學(xué)位論文 前1條
1 張桂斌;新型直流輸電及其相關(guān)技術(shù)研究[D];浙江大學(xué);2001年
相關(guān)碩士學(xué)位論文 前9條
1 黃家龍;三電平靜止同步補(bǔ)償器通用仿真模型控制策略研究[D];北京交通大學(xué);2016年
2 余淑琴;鏈?zhǔn)絊TATCOM非線性控制方法及PWM策略研究[D];北京交通大學(xué);2012年
3 杜明軍;大容量鏈?zhǔn)絊TATCOM主電路及控制策略的研究[D];北京交通大學(xué);2012年
4 劉正富;鏈?zhǔn)届o止同步補(bǔ)償器主電路及控制策略研究[D];浙江大學(xué);2012年
5 彭繁;三相不平衡下級聯(lián)STATCOM的控制策略研究[D];華中科技大學(xué);2012年
6 唐政;D-STATCOM變流器及控制策略的研究[D];山東大學(xué);2009年
7 鄧家澤;不平衡負(fù)荷無功與負(fù)序電流的綜合補(bǔ)償研究[D];西南交通大學(xué);2009年
8 蘇靜;不平衡系統(tǒng)中STATCOM的控制方法和主電路研究[D];江蘇大學(xué);2009年
9 郭濤;基于IGCT的STATCOM主電路結(jié)構(gòu)研究[D];江蘇大學(xué);2006年
,本文編號:2227140
本文鏈接:http://sikaile.net/kejilunwen/dianlidianqilunwen/2227140.html