【摘要】：目前,我國高壓輸電線路普遍使用自動(dòng)重合閘,在一定程度上能夠提高供電可靠性,但當(dāng)重合于永久性故障或者瞬時(shí)性故障二次電弧未熄滅時(shí),會(huì)導(dǎo)致重合失敗而給電力系統(tǒng)帶來二次沖擊。因此,在重合閘動(dòng)作前能夠確定故障性質(zhì)和熄弧時(shí)間的重合閘方式即自適應(yīng)重合閘就顯得特別重要。本文從輸電線路單相接地故障相端電壓特征、故障性質(zhì)識(shí)別、瞬時(shí)性故障二次電弧熄滅時(shí)間確定以及重合閘裝置實(shí)現(xiàn)方案四方面對(duì)自適應(yīng)重合閘技術(shù)展開研究。首先,分析了高壓輸電線路故障電弧特點(diǎn),給出了高壓輸電線路一次電弧和二次電弧數(shù)學(xué)模型,利用ATP-EMTP的TACS以及MODELS語言搭建了輸電線路瞬時(shí)性故障及永久性故障的仿真模型,研究了瞬時(shí)性故障和永久性故障的故障相端電壓特征。其次,利用局部均值分解自適應(yīng)地將故障相端電壓信號(hào)分解成若干個(gè)具有物理意義的純調(diào)頻分量,提取故障電壓特定頻段信號(hào),避免高頻信號(hào)及噪聲對(duì)故障分析的干擾;依據(jù)瞬時(shí)性與永久性故障斷路器跳開后高壓輸電線路端電壓局部極值個(gè)數(shù)的區(qū)別,判別故障性質(zhì)。理論分析和仿真結(jié)果表明,該方法能準(zhǔn)確識(shí)別故障性質(zhì)。再次,為了進(jìn)一步提高重合閘的成功率與縮短停電時(shí)間,分析了高壓輸電線路瞬時(shí)性故障二次電弧與恢復(fù)電壓階段故障相端電壓的頻率特征,利用小波提取特定頻段的電壓信號(hào),根據(jù)兩電壓階段能量函數(shù)比值的區(qū)別來確定熄弧時(shí)間,并給出了基于熄弧時(shí)間的自適應(yīng)重合閘方案,能夠在一定程度上縮短停電時(shí)間。最后,提出了基于DSP的高壓輸電線路自適應(yīng)重合閘裝置的總體設(shè)計(jì)方案,完成了數(shù)據(jù)采集、數(shù)據(jù)處理、數(shù)據(jù)存儲(chǔ)和系統(tǒng)控制等部分的硬件設(shè)計(jì),開發(fā)了數(shù)據(jù)采集、處理、串口通訊、人機(jī)界面等主要軟件功能模塊。
[Abstract]:At present, automatic reclosing is widely used in HV transmission lines in China, which can improve the reliability of power supply to some extent, but when the secondary arc is not extinguished when the reclosing occurs in permanent fault or transient fault, It will lead to the failure of the coincidence and bring secondary impact to the power system. Therefore, it is very important to determine the characteristics of the fault and the time of arc extinguishing before the reclosing operation, that is, adaptive reclosing. In this paper, the adaptive reclosing technology is studied from four aspects: phase voltage characteristics, fault character identification, secondary arc extinguishing time determination and reclosing device implementation of single-phase grounding fault of transmission line. Firstly, the characteristics of fault arc of HV transmission line are analyzed, the mathematical models of primary arc and secondary arc of HV transmission line are given, and the simulation model of transient fault and permanent fault of transmission line is built by using TACS of ATP-EMTP and MODELS language. The terminal voltage characteristics of transient and permanent faults are studied. Secondly, local mean decomposition is used to decompose the terminal voltage signal into several pure frequency components with physical significance, and extract the fault voltage signal in specific frequency band to avoid the interference of high frequency signal and noise to the fault analysis. According to the difference of the number of local extremum of terminal voltage between transient and permanent fault circuit breakers, the fault properties are determined. Theoretical analysis and simulation results show that the method can accurately identify fault properties. Thirdly, in order to further improve the success rate of reclosing and shorten the time of power outage, the frequency characteristics of the terminal voltage of secondary arc and fault phase in the phase of transient fault of high voltage transmission line are analyzed. Based on the difference of the ratio of energy function between two voltage stages, the arc extinguishing time is determined by using wavelet to extract the voltage signal of certain frequency band. An adaptive reclosing scheme based on the arc extinguishing time is presented, which can shorten the outage time to a certain extent. Finally, the overall design scheme of adaptive reclosing device for HV transmission line based on DSP is proposed. The hardware design of data acquisition, data processing, data storage and system control are completed, and data acquisition and processing are developed. Serial communication, man-machine interface and other main software functional modules.
【學(xué)位授予單位】：湖南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TM75;TM762.2

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本文編號(hào)：2232948