本文選題：分布式電源 + Park變換　； 參考：《華北電力大學》2017年碩士論文

【摘要】：微網作為分布式電源與負荷的有效組網方式,憑借著其對分布式電源的高效利用,以及能夠在并網和孤島兩種運行方式下無縫切換等優(yōu)勢而被廣泛接受。微網作為控制單元雖然有著易于控制和管理的優(yōu)點,但是其靈活的運行方式以及復雜的電源故障特點均給現(xiàn)有的保護配置提出了新的挑戰(zhàn),使傳統(tǒng)的配電網保護不再具有適用性,因此需要設計新的保護方案。本文圍繞此問題進行深入研究,完成的主要工作和成果如下:(1)分析了由逆變型分布式電源組成的微網的故障特性。以三個保護區(qū)組成的微網模型作為研究對象,分別在并網和孤島兩種運行方式下進行了故障仿真,深入分析了微網故障特性,為后續(xù)工作的開展奠定了基礎。(2)研究了基于Park變換的低電壓保護方案。為適應微網在孤島運行方式下故障電流小的特征,利用故障時電壓降落作為保護的依據,從而提高了保護的可靠性。該保護方案利用Park變換,把三相電壓上的擾動量轉換為dq軸的直流量,從而更好地描述故障擾動量。同時,對保護原理進行了理論分析,設定擾動量的閾值實現(xiàn)保護的動作。(3)對基于Park變換的低電壓保護方案進行改進,進一步考慮了保護之間的配合以及動作的快速性,提出了一種基于低電壓反時限微網保護方案。通過之前的故障特性分析,提出了保護動作方程,闡述了保護的原理。為實現(xiàn)保護之間的配合,對保護上下級之間的配合進行了整定。針對含有旋轉式電源的微網,提出了依靠故障選相改進保護的設想;考慮到接地時過渡電阻問題,提出了利用電抗比例系數改進保護的猜想。(4)最后,本文在MATLAB/Simulink平臺上搭建了微網系統(tǒng),對所提方案進行有效性驗證。分別對不同故障類型和不同故障點進行仿真,結果表明在并網和孤島兩種運行方式下,基于低電壓反時限保護方案能夠很好地切除各種故障,并且上下級保護之間能夠有效的配合,解決了過流保護無法適應微網故障特性的問題。
[Abstract]:As an effective way of constructing distributed power supply and load, microgrid has been widely accepted because of its advantages of efficient utilization of distributed power supply and seamless switching between grid-connected and islanding operation modes. As a control unit, microgrid has the advantages of easy control and management, but its flexible operation mode and complex power failure characteristics pose new challenges to the existing protection configuration. Traditional distribution network protection is no longer applicable, so it is necessary to design a new protection scheme. The main work and results of this paper are as follows: 1) the fault characteristics of microgrid composed of inverter distributed power supply are analyzed. Taking the microgrid model composed of three protected areas as the research object, the fault simulation is carried out under the two operation modes of grid-connected and isolated island, and the fault characteristics of microgrid are deeply analyzed. A low voltage protection scheme based on Park transform is studied. In order to adapt to the characteristics of the microgrid with small fault current under the isolated island operation mode, the voltage drop during the fault is used as the basis of the protection, thus the reliability of the protection is improved. The Park transform is used to convert the disturbance on the three-phase voltage to the direct current of the dq-axis, which can better describe the disturbance of the fault. At the same time, the theory of protection is analyzed theoretically, and the protection scheme based on Park transform is improved by setting the threshold value of disturbance quantity to realize the protection. The cooperation between the protection and the rapidity of the action are further considered. A low voltage inverse-time microgrid protection scheme is proposed. Through the analysis of fault characteristics before, the protection action equation is put forward and the principle of protection is expounded. In order to realize the cooperation between the protection, the cooperation between the upper and lower levels of the protection is adjusted. Aiming at the microgrid with rotary power supply, the assumption of improving the protection by fault phase selection is put forward, and the conjecture of using reactance proportional coefficient to improve the protection is put forward considering the problem of transition resistance in grounding. In this paper, a microgrid system is built on MATLAB/Simulink platform, and the validity of the proposed scheme is verified. The simulation results of different fault types and different fault points show that under the two operation modes of grid-connected and islanding, the low-voltage inverse time-limited protection scheme can remove all kinds of faults well. The overcurrent protection can not adapt to the fault characteristics of microgrid.
【學位授予單位】：華北電力大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TM77;TM727

【參考文獻】

相關期刊論文 前10條

1 趙俊瑞;王占山;王繼東;張化光;;微網故障特性分析及保護方法[J];上海交通大學學報;2015年06期

2 唐波;李昱;彭友仙;曹紅英;陳彬;;基于IEO的微網關聯(lián)區(qū)域保護研究[J];中國電力;2015年06期

3 鄧超平;唐志軍;張曦;鄒貴彬;高厚磊;;一種新型的微網自適應過流保護方法[J];電力系統(tǒng)保護與控制;2015年04期

4 奚玲玲;;分布式能源微網控制保護與能量管理解決方案[J];電氣技術;2014年S1期

5 鄧虹;楊秀;劉舒;張美霞;劉方;郭鵬超;;微網多級多重保護協(xié)調配置與實現(xiàn)[J];電網技術;2014年11期

6 鄧虹;沈丹濤;楊秀;劉舒;劉方;郭鵬超;;多代理技術在微網保護中的實現(xiàn)[J];華東電力;2014年08期

7 曾德輝;潘國清;王鋼;朱革蘭;蔡穎倩;;含V/f控制DG的微電網故障分析方法[J];中國電機工程學報;2014年16期

8 趙鳳賢;孫麗穎;;基于Multi-Agent技術的微網分區(qū)保護的研究[J];中國電力;2014年05期

9 賈清泉;孫玲玲;王美娟;楊威;;基于節(jié)點搜索的微電網自適應保護方法[J];中國電機工程學報;2014年10期

10 余運俊;張燕飛;萬曉鳳;張翔;;光伏微網主動式孤島檢測方法綜述[J];電測與儀表;2014年01期

相關博士學位論文 前3條

1 田兵;基于大功率電力電子技術可靠供電系統(tǒng)[D];華中科技大學;2014年

2 蘇玲;微網控制及小信號穩(wěn)定性分析與能量管理策略[D];華北電力大學（北京）;2011年

3 丁磊;多微網配電系統(tǒng)的分層孤島運行及保護控制[D];山東大學;2007年

相關碩士學位論文 前10條

1 彭松;微網接入10kV配電網分界保護技術研究與裝置開發(fā)[D];華南理工大學;2014年

2 陳e，

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