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

【摘要】：目前,各國(guó)紛紛開(kāi)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(chǔ)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(yùn)行與維護(hù)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(diǎn)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(guò)電力電子裝置接入電網(wǎng),在其并網(wǎng)運(yùn)行過(guò)程中,當(dāng)電力系統(tǒng)出現(xiàn)擾動(dòng),逆變電源將由先前的穩(wěn)定運(yùn)行狀態(tài)經(jīng)過(guò)一系列調(diào)整回復(fù)到原有穩(wěn)定狀態(tài)或者過(guò)渡到新的穩(wěn)定狀態(tài)。先后兩個(gè)穩(wěn)定狀態(tài)之間的調(diào)整過(guò)程稱(chēng)之為故障暫態(tài)過(guò)程。并網(wǎng)逆變電源在故障暫態(tài)過(guò)程中受控于自身控制器,為了研究控制策略對(duì)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(xì)模型;在此基礎(chǔ)上,詳細(xì)分析了控制器控制參數(shù)對(duì)逆變型分布式電源暫態(tài)響應(yīng)的影響;針對(duì)對(duì)稱(chēng)性故障和非對(duì)稱(chēng)性故障情況,對(duì)逆變型分布式電源的故障暫態(tài)特征進(jìn)行深入的分析。針對(duì)分布式電源多點(diǎn)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(hù)原理的集成保護(hù)新方案。暫態(tài)極性比較保護(hù)是運(yùn)用小波變換提取故障暫態(tài)高頻信號(hào)的某一頻段信息作為故障判斷的依據(jù),通過(guò)比較暫態(tài)高頻信號(hào)的極性,迅速準(zhǔn)確判斷出故障位置。將暫態(tài)極性比較保護(hù)原理應(yīng)用于微電網(wǎng)集成保護(hù)方案中,以母線(xiàn)作為載體構(gòu)建集成保護(hù)單元,利用本地故障信息和相鄰保護(hù)單元故障信息對(duì)母線(xiàn)各出線(xiàn)以及線(xiàn)路兩端信號(hào)的極性進(jìn)行比較,從而對(duì)母線(xiàn)故障和線(xiàn)路故障進(jìn)行判斷。與此同時(shí)集成網(wǎng)絡(luò)保護(hù)單元提取多點(diǎn)信息,對(duì)整體區(qū)域暫態(tài)信號(hào)極性進(jìn)行綜合比較,實(shí)現(xiàn)對(duì)故障的快速定位與隔離,為本地保護(hù)提供后備保護(hù)。
[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(xué)位授予單位】：天津大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：TM727

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本文編號(hào)：1983914