發(fā)布時間：2018-06-24 18:23

  本文選題：配電網靜止同步補償器 + 鏈式結構��； 參考：《北京交通大學》2014年碩士論文

【摘要】：隨著現代社會的發(fā)展,用戶對電能質量要求越來越高,因此配電網中無功功率不足和不平衡等問題受到了廣泛的關注。以提高用戶側電能質量為宗旨的用戶電力技術(Custom Power或DFATCS)是一種將控制技術、電力電子技術和微處理技術等高新技術應用到配電系統(tǒng)中,以消除供電短時中斷、電壓波動和閃變及三相不平衡,補償無功功率,減小諧波畸變,從而提高電能質量和供電可靠性的新型綜合技術,是靈活交流輸電系統(tǒng)(FACTS)向配電網的延伸。配電網靜止同步補償器(D-STATCOM)作為用戶電力技術的代表裝置,與其他設備相比具有性價比高、功能強大、性能優(yōu)良等優(yōu)點,能綜合補償配電網中的無功功率和不平衡等電能質量問題,具有非常廣闊的應用前景。D-STATCOM不平靜工況下的控制策略一直是研究的重點和難點,鑒于鏈式結構D-STATCOM較其他結構的優(yōu)越性,本文以鏈式D-STATCOM為對象,對其補償不平衡負荷的控制策略進行深入詳盡的研究。 首先,介紹了課題研究背景和意義,對D-STATCOM的國內外應用現狀、主電路拓撲研究現狀和控制策略研究現狀作了簡單介紹并比較了各種主電路拓撲和控制策略的優(yōu)缺點。詳細闡述了D-STATCOM的基本結構和基本工作原理,并利用正負序分離法和派克變換建立了不平衡工況下D-STATCOM的數學模型。 其次,系統(tǒng)地闡述了微分幾何法和滑模變結構控制理論,為后文控制策略的設計奠定理論基礎。介紹了現有的補償電網不平衡的控制策略并指出了存在的問題,為了克服傳統(tǒng)控制策略補償不平衡的缺點,提出了基于輸入輸出反饋線性化的正負序積分滑模變結構控制策略。其基本思想為將整個配電系統(tǒng)和D-STATCOM分成正序模塊和負序模塊,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)的基礎上采用積分滑模變結構控制理論構成對各種干擾都有較強魯棒性的控制策略。正序控制環(huán)節(jié)和負序控制環(huán)節(jié)分別補償無功功率和負序電流,因此該控制策略適用于平衡及不平衡工況,能綜合提高電能質量。 最后,在PSCAD/EMTDC環(huán)境下搭建了仿真模型,在無干擾、只有內部干擾、只有外部干擾和內外部干擾同時存在的情況下進行仿真,驗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.
【學位授予單位】：北京交通大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM761

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本文編號：2062498