本文選題：配電網(wǎng)靜止同步補(bǔ)償器 + 鏈?zhǔn)浇Y(jié)構(gòu)　； 參考：《北京交通大學(xué)》2014年碩士論文

【摘要】：隨著現(xiàn)代社會(huì)的發(fā)展,用戶對(duì)電能質(zhì)量要求越來(lái)越高,因此配電網(wǎng)中無(wú)功功率不足和不平衡等問(wèn)題受到了廣泛的關(guān)注。以提高用戶側(cè)電能質(zhì)量為宗旨的用戶電力技術(shù)(Custom Power或DFATCS)是一種將控制技術(shù)、電力電子技術(shù)和微處理技術(shù)等高新技術(shù)應(yīng)用到配電系統(tǒng)中,以消除供電短時(shí)中斷、電壓波動(dòng)和閃變及三相不平衡,補(bǔ)償無(wú)功功率,減小諧波畸變,從而提高電能質(zhì)量和供電可靠性的新型綜合技術(shù),是靈活交流輸電系統(tǒng)(FACTS)向配電網(wǎng)的延伸。配電網(wǎng)靜止同步補(bǔ)償器(D-STATCOM)作為用戶電力技術(shù)的代表裝置,與其他設(shè)備相比具有性價(jià)比高、功能強(qiáng)大、性能優(yōu)良等優(yōu)點(diǎn),能綜合補(bǔ)償配電網(wǎng)中的無(wú)功功率和不平衡等電能質(zhì)量問(wèn)題,具有非常廣闊的應(yīng)用前景。D-STATCOM不平靜工況下的控制策略一直是研究的重點(diǎn)和難點(diǎn),鑒于鏈?zhǔn)浇Y(jié)構(gòu)D-STATCOM較其他結(jié)構(gòu)的優(yōu)越性,本文以鏈?zhǔn)紻-STATCOM為對(duì)象,對(duì)其補(bǔ)償不平衡負(fù)荷的控制策略進(jìn)行深入詳盡的研究。 首先,介紹了課題研究背景和意義,對(duì)D-STATCOM的國(guó)內(nèi)外應(yīng)用現(xiàn)狀、主電路拓?fù)溲芯楷F(xiàn)狀和控制策略研究現(xiàn)狀作了簡(jiǎn)單介紹并比較了各種主電路拓?fù)浜涂刂撇呗缘膬?yōu)缺點(diǎn)。詳細(xì)闡述了D-STATCOM的基本結(jié)構(gòu)和基本工作原理,并利用正負(fù)序分離法和派克變換建立了不平衡工況下D-STATCOM的數(shù)學(xué)模型。 其次,系統(tǒng)地闡述了微分幾何法和滑模變結(jié)構(gòu)控制理論,為后文控制策略的設(shè)計(jì)奠定理論基礎(chǔ)。介紹了現(xiàn)有的補(bǔ)償電網(wǎng)不平衡的控制策略并指出了存在的問(wèn)題,為了克服傳統(tǒng)控制策略補(bǔ)償不平衡的缺點(diǎn),提出了基于輸入輸出反饋線性化的正負(fù)序積分滑模變結(jié)構(gòu)控制策略。其基本思想為將整個(gè)配電系統(tǒng)和D-STATCOM分成正序模塊和負(fù)序模塊,在利用輸入輸出反饋線性化方法將二者線化解耦成偽線性系統(tǒng)的基礎(chǔ)上采用積分滑模變結(jié)構(gòu)控制理論構(gòu)成對(duì)各種干擾都有較強(qiáng)魯棒性的控制策略。正序控制環(huán)節(jié)和負(fù)序控制環(huán)節(jié)分別補(bǔ)償無(wú)功功率和負(fù)序電流,因此該控制策略適用于平衡及不平衡工況,能綜合提高電能質(zhì)量。 最后,在PSCAD/EMTDC環(huán)境下搭建了仿真模型,在無(wú)干擾、只有內(nèi)部干擾、只有外部干擾和內(nèi)外部干擾同時(shí)存在的情況下進(jìn)行仿真,驗(yàn)證所提控制策略的有效性和魯棒性。
[Abstract]:With the development of modern society, the demand for power quality is getting higher and higher, so the problems of reactive power shortage and imbalance in distribution network have been paid more and more attention. Custom Power or DFATCS, which aims to improve the quality of power on the user side, is a kind of high and new technology, such as control technology, power electronics technology and micro-processing technology, which is applied to the distribution system to eliminate the short-time interruption of power supply. The new integrated technology of voltage fluctuation, flicker and three-phase unbalance, compensating reactive power, reducing harmonic distortion and improving power quality and reliability is the extension of facts to distribution network. Distribution network static synchronous compensator (D-STATCOM), as the representative device of user power technology, has the advantages of high performance-price ratio, powerful function, excellent performance and so on. In order to compensate reactive power and unbalanced power quality problems in distribution network synthetically, the control strategy of D-STATCOM has a very broad application prospect, which is always the focus and difficulty of the research. In view of the superiority of chain structure D-STATCOM compared with other structures, this paper takes the chain-type D-STATCOM as the object, and makes a thorough research on its control strategy to compensate the unbalanced load. Firstly, the background and significance of the research are introduced. The application of D-STATCOM at home and abroad, the research status of main circuit topology and control strategy are briefly introduced, and the advantages and disadvantages of various main circuit topologies and control strategies are compared. The basic structure and working principle of D-STATCOM are described in detail, and the mathematical model of D-STATCOM under unbalanced condition is established by using positive and negative sequence separation method and Pike transform. Secondly, the differential geometry method and sliding mode variable structure control theory are systematically expounded, which lays a theoretical foundation for the design of control strategy. This paper introduces the existing control strategies for compensating the imbalance of the power network and points out the existing problems. In order to overcome the shortcomings of the traditional control strategy to compensate the imbalance, a sliding mode variable structure control strategy based on the linearization of input and output feedback is proposed. Its basic idea is to divide the whole distribution system and D-STATCOM into positive sequence module and negative sequence module. Based on the linearization of input and output feedback, the two lines are coupled to pseudo-linear systems, and the integral sliding mode variable structure control theory is used to construct a control strategy which is robust to all kinds of disturbances. The positive sequence control link and the negative sequence control link compensate the reactive power and the negative sequence current respectively, so the control strategy is suitable for the balanced and unbalanced conditions, and can improve the power quality synthetically. Finally, the simulation model is built in PSCAD / EMTDC environment. The simulation results show that the proposed control strategy is effective and robust without interference, only internal interference, only external interference and internal and external interference.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM761

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