本文選題：分布式電源 + 配電網(wǎng)保護　； 參考：《浙江大學》2017年碩士論文

【摘要】：隨著能源形勢和環(huán)境問題的嚴峻,以太陽能、風能等可再生能源為代表的分布式發(fā)電技術(shù)(DG,Distributed Generation)得到了越來越多的重視和發(fā)展。大量分布式電源的接入,改變了配電網(wǎng)原有的單側(cè)電源輻射性結(jié)構(gòu),使傳統(tǒng)的配電網(wǎng)保護策略無法快速、正確地動作。另一方面,隨著智能配電網(wǎng)的建設,微機保護得到了大力發(fā)展,微機保護的應用以及通訊網(wǎng)絡的建設,使基于多點信息的廣域保護策略成為可能�；诖吮尘�,本文著重研究了分布式電源接入對配電網(wǎng)保護的影響和廣域保護策略,同時,對微機保護裝置進行了具體分析和設計。本文首先針對逆變型分布式電源,詳細建立了恒功率控制策略下的并網(wǎng)逆變器模型并進行了故障分析,以此為基礎得出了用于保護分析的DG簡化模型。然后,重點研究了 DG接入配電網(wǎng)對傳統(tǒng)三段式電流保護的影響,并以典型配電網(wǎng)模型為例,仿真分析了 DG不同容量和接入位置時的情況。與此同時,分析了DG對重合閘的影響,指出重合閘可能出現(xiàn)誤動或非同期合閘等現(xiàn)象�；谖C測控保護裝置,本文研究了基于多點信息的配電網(wǎng)廣域保護方案,包括集中式和分布式兩種具體結(jié)構(gòu),通過采集多點信息,綜合分析和判斷,以實現(xiàn)故障定位和切除。DG一般通過逆變器并網(wǎng),可能會產(chǎn)生大量高次諧波,同時對配電網(wǎng)保護的快速性提出了更高要求。為此,本文詳細研究了適用于微機保護的滑窗離散傅里葉算法(Sliding Discrete Fourier Transform,SDFT),分析了各種形式 SDFT 的基本原理。針對SDFT的穩(wěn)定性問題,研究了其不穩(wěn)定原因,并提出了交錯并行SDFT的穩(wěn)定性方法,能夠保證各種形式SDFT的穩(wěn)定運行。最后,本文詳細介紹了微機保護裝置的系統(tǒng)架構(gòu)和工作原理,并給出了具體軟硬件設計方法。
[Abstract]:With the severe energy situation and environmental problems, distributed generation technology, such as solar energy, wind energy and other renewable energy, has been paid more and more attention and development. The access of a large number of distributed power sources has changed the original radiation structure of the single side power supply of distribution network, which makes the traditional protection strategy of distribution network unable to move quickly and correctly. On the other hand, with the construction of intelligent distribution network, microcomputer protection has been greatly developed. The application of microcomputer protection and the construction of communication network make the wide area protection strategy based on multi-point information possible. Based on this background, this paper focuses on the influence of distributed power access on distribution network protection and the wide area protection strategy. At the same time, the microcomputer protection device is analyzed and designed in detail. In this paper, a grid-connected inverter model based on constant power control strategy is established and fault analysis is carried out. Based on this model, a simplified DG model for protection analysis is obtained. Then, the influence of DG access to distribution network on the traditional three-segment current protection is studied, and the typical distribution network model is taken as an example to simulate and analyze the DG with different capacity and access location. At the same time, the influence of DG on reclosing is analyzed. Based on the microcomputer measurement and control protection device, this paper studies the wide area protection scheme of distribution network based on multi-point information, including centralized and distributed two concrete structures, through the collection of multi-point information, comprehensive analysis and judgment. In order to achieve fault location and removal. DG is usually connected to the grid by inverter, which may produce a large number of high-order harmonics. At the same time, higher requirements are put forward for the fast protection of distribution network. In this paper, the sliding window discrete Fourier algorithm for microcomputer protection is studied in detail, and the basic principles of various forms of SDFT are analyzed. Aiming at the stability of SDFT, the causes of instability are studied, and the stability method of staggered parallel SDFT is proposed, which can guarantee the stable operation of SDFT in various forms. Finally, the system structure and working principle of microcomputer protection device are introduced in detail, and the design method of hardware and software is given.
【學位授予單位】：浙江大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TM774

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