本文選題：微電網(wǎng) + 故障暫態(tài)　； 參考：《天津大學》2014年碩士論文

【摘要】：目前,各國紛紛開始研究高效的、可靠的分布式發(fā)電技術(shù)。微電網(wǎng)就是在分布式發(fā)電基礎上形成的一種新型的供電方式,但是隨著分布式電源的接入,改變了傳統(tǒng)意義上的潮流特性和故障特性,又給大電網(wǎng)的運行與維護提出了許多新的挑戰(zhàn)。本文主要研究了微電網(wǎng)的故障暫態(tài)特性,研究重點集中于逆變型分布式電源故障暫態(tài)特征。逆變型分布式電源通過電力電子裝置接入電網(wǎng),在其并網(wǎng)運行過程中,當電力系統(tǒng)出現(xiàn)擾動,逆變電源將由先前的穩(wěn)定運行狀態(tài)經(jīng)過一系列調(diào)整回復到原有穩(wěn)定狀態(tài)或者過渡到新的穩(wěn)定狀態(tài)。先后兩個穩(wěn)定狀態(tài)之間的調(diào)整過程稱之為故障暫態(tài)過程。并網(wǎng)逆變電源在故障暫態(tài)過程中受控于自身控制器,為了研究控制策略對并網(wǎng)逆變型分布式電源故障暫態(tài)特征的影響,首先建立了能夠反映逆變器控制策略的逆變型分布式電源的詳細模型;在此基礎上,詳細分析了控制器控制參數(shù)對逆變型分布式電源暫態(tài)響應的影響;針對對稱性故障和非對稱性故障情況,對逆變型分布式電源的故障暫態(tài)特征進行深入的分析。針對分布式電源多點接入的配電系統(tǒng)而形成的微電網(wǎng),提出了一種基于暫態(tài)極性保護原理的集成保護新方案。暫態(tài)極性比較保護是運用小波變換提取故障暫態(tài)高頻信號的某一頻段信息作為故障判斷的依據(jù),通過比較暫態(tài)高頻信號的極性,迅速準確判斷出故障位置。將暫態(tài)極性比較保護原理應用于微電網(wǎng)集成保護方案中,以母線作為載體構(gòu)建集成保護單元,利用本地故障信息和相鄰保護單元故障信息對母線各出線以及線路兩端信號的極性進行比較,從而對母線故障和線路故障進行判斷。與此同時集成網(wǎng)絡保護單元提取多點信息,對整體區(qū)域暫態(tài)信號極性進行綜合比較,實現(xiàn)對故障的快速定位與隔離,為本地保護提供后備保護。
[Abstract]:At present, many countries have begun to study efficient and reliable distributed generation technology. Microgrid is a new power supply method based on distributed generation, but with the access of distributed generation, it changes the traditional power flow characteristics and fault characteristics. It also puts forward many new challenges to the operation and maintenance of large power grid. In this paper, the fault transient characteristics of microgrid are studied, with emphasis on the transient characteristics of inverter distributed generation. The inverter distributed power supply is connected to the power network through power electronic devices. In the process of grid connection, when the power system is disturbed, The inverter will return to the old stable state or transition to a new stable state after a series of adjustments. The adjustment process between two stable states is called fault transient process. In order to study the influence of control strategy on the transient characteristics of grid-connected distributed power supply, the inverter power supply is controlled by its own controller during the transient process of fault. Firstly, a detailed model of inverter distributed power supply which can reflect inverter control strategy is established, and the influence of controller control parameters on transient response of inverter distributed power supply is analyzed in detail. In this paper, the fault transient characteristics of inverter distributed power generation are analyzed in detail in view of symmetric fault and asymmetric fault. A new integrated protection scheme based on the principle of transient polarity protection is proposed for the microgrid formed by the distribution system with multi-point access of distributed power supply. Transient polarity comparison protection is to use wavelet transform to extract some frequency information of transient high frequency signal of fault as the basis of fault judgment. By comparing the polarity of transient high frequency signal, the fault location can be determined quickly and accurately. The principle of transient polarity comparison protection is applied to the integrated protection scheme of microgrid, and the integrated protection unit is constructed with the bus as the carrier. Based on the local fault information and the fault information of adjacent protection units, the polarity of each outline and the two end signals of the bus is compared to judge the fault of the bus and the fault of the line. At the same time, the integrated network protection unit extracts the multi-point information, compares the polarity of the transient signal of the whole region, realizes the fast location and isolation of the fault, and provides backup protection for the local protection.
【學位授予單位】：天津大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM727

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本文編號：1983914