發(fā)布時(shí)間：2018-01-30 16:41

  本文關(guān)鍵詞： 特高壓直流 單極接地故障 過(guò)電壓 影響因素 波過(guò)程 機(jī)理分析 限制措施　出處：《浙江大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：單極接地故障是特高壓直流輸電線路上發(fā)生概率較高且造成過(guò)電壓較為嚴(yán)重的故障類型,因此單極接地故障過(guò)電壓也是特高壓直流輸電線路過(guò)電壓研究的重點(diǎn)。通過(guò)仿真計(jì)算得到故障極線路沿線發(fā)生接地故障時(shí)健全極線路上沿線過(guò)電壓分布規(guī)律,并將故障極線路中點(diǎn)發(fā)生接地故障時(shí),健全極線路中點(diǎn)的過(guò)電壓分成第1次躍升和第2次躍升兩個(gè)過(guò)程。將可能對(duì)該過(guò)電壓產(chǎn)生影響的因素按照嚴(yán)重程度分為一般因素和關(guān)鍵因素,其中一般因素包括輸電線路結(jié)構(gòu)及參數(shù)、直流控制系統(tǒng)、桿塔接地電阻、線路中點(diǎn)桿塔裝設(shè)避雷器、輸電線路長(zhǎng)度和輸送功率,關(guān)鍵影響因素包括接地故障位置、直流濾波器參數(shù)以及直流濾波器型式。并進(jìn)一步分析了各影響因素對(duì)過(guò)電壓的影響,確定直流濾波器主電容是影響直流線路單極接地故障過(guò)電壓的最關(guān)鍵因素�；跇O線的電磁耦合作用和波過(guò)程闡述了兩次電壓躍升的產(chǎn)生機(jī)理以及直流濾波器主電容對(duì)過(guò)電壓的影響機(jī)理,故障極線路發(fā)生單極接地故障時(shí),會(huì)在沿線產(chǎn)生2次電流躍升,由于極線間的電磁耦合作用,在健全極線路上也會(huì)產(chǎn)生2次反向電流躍升,2次電流脈沖會(huì)對(duì)健全極線路對(duì)地電容反向充電,從而造成健全極線路電壓在額定電壓的基礎(chǔ)上發(fā)生2次躍升,從而導(dǎo)致過(guò)電壓,而直流濾波器主電容則主要通過(guò)影響第2次電流躍升作用從而影響該過(guò)電壓的第2次躍升作用,并對(duì)該過(guò)電壓產(chǎn)生影響。研究表明,直流濾波器主電容參數(shù)是限制單極接地故障過(guò)電壓的關(guān)鍵因素,而其他因素對(duì)該過(guò)電壓影響并不大,主電容越大,過(guò)電壓越嚴(yán)重,為控制該過(guò)電壓幅值不超過(guò)1.7p.u.,推薦±800kV特高壓線路直流濾波器主電容參數(shù)取值范圍為1～2μF。
[Abstract]:Monopole grounding fault is a kind of fault with high probability and serious overvoltage on UHVDC transmission line. Therefore, the over-voltage of single-pole grounding fault is also the focus of UHV HVDC line overvoltage research. Through the simulation calculation, the distribution of overvoltage along the perfect pole line is obtained when grounding fault occurs along the fault pole line. And grounding fault occurs at the midpoint of the fault pole line. The overvoltage at the midpoint of the sound pole line is divided into two processes: the first jump and the second jump. The factors that may affect the overvoltage are divided into general factors and key factors according to the severity of the overvoltage. The general factors include the structure and parameters of transmission line, DC control system, grounding resistance of tower, the installation of lightning arrester at the middle point of transmission line, the length of transmission line and the transmission power. The key factors include ground fault location, DC filter parameters and DC filter types. Determining the main capacitance of DC filter is the most important factor to influence the overvoltage of DC line unipolar grounding fault. Based on the electromagnetic coupling of the pole line and the wave process, the mechanism of two voltage leaps and the main DC filter are expounded. The influence mechanism of capacitance on overvoltage. When the single pole grounding fault occurs in the fault pole line, there will be two current jumps along the line, and two reverse current jumps will also occur on the perfect pole line due to the electromagnetic coupling between the pole lines. The second current pulse will reverse charge the capacitance to the ground of the sound pole line, thus causing the voltage of the sound pole line to jump twice on the basis of the rated voltage, resulting in overvoltage. On the other hand, the main capacitance of DC filter mainly affects the second jump of the overvoltage by affecting the second current jump, and has an effect on the overvoltage. The main capacitance parameter of DC filter is the key factor to limit the overvoltage of unipolar grounding fault, but other factors have little influence on the overvoltage. The larger the main capacitance, the more serious the overvoltage. In order to control the overvoltage amplitude not to exceed 1.7 p.u., it is recommended that the range of main capacitance parameters of 鹵800 kV UHV DC filter is 1 渭 F.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM75

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