本文選題：單相接地故障 + 故障分析法�。� 參考：《西安科技大學(xué)》2017年碩士論文

【摘要】：城區(qū)配電網(wǎng)中,電纜以其占地面積小、供電可靠性高、不易受環(huán)境影響等特點(diǎn)逐漸取代了架空線,成為主要供電線路。由于大多數(shù)電纜都敷設(shè)于電纜溝或埋于地下,故障不易查找,因此,準(zhǔn)確的故障定位具有非常重要的意義。本文提出了簡單易行的故障分析法,構(gòu)建精確的測距方程,實(shí)現(xiàn)準(zhǔn)確測距。建立了考慮高階無窮小量的線路分布參數(shù)模型,該模型精確計(jì)及了線路參數(shù)的分布特性,滿足了配電網(wǎng)電纜故障測距的要求。在該模型的基礎(chǔ)上,依據(jù)從線路兩端推算到故障點(diǎn)的零模電壓瞬時(shí)值相等的原理,構(gòu)造了故障測距方程,該方程是時(shí)域微分方程,適用于任意電壓等級、線路參數(shù)以及長度的線路暫穩(wěn)態(tài)分析。針對零模信號(hào)需要高階求導(dǎo)的問題,為精確求取零模信號(hào)的高階導(dǎo)數(shù),本文提出了零模信號(hào)正弦逼近擬合的方法。該方法克服了差分近似代替微分求導(dǎo)誤差大的缺陷,提高了測距的準(zhǔn)確性。針對粒子群極值尋優(yōu)算法缺乏局部區(qū)域的精細(xì)搜索能力,提出了采用粒子群-牛頓迭代融合的故障測距算法求解故障距離。并用ATP和MATLAB對不同仿真條件下的單相接地故障測距方法進(jìn)行了仿真驗(yàn)證,結(jié)果表明了本文提出的測距方法的有效性和準(zhǔn)確性。
[Abstract]:In the urban distribution network, the cable has gradually replaced the overhead line and become the main power supply line because of its small area, high reliability of power supply and not easy to be affected by the environment. Because most cables are laid in cable trenches or buried underground, it is difficult to find fault, so accurate fault location is very important. In this paper, a simple and easy fault analysis method is put forward, and the accurate location equation is constructed to realize the accurate location. A transmission line distribution parameter model considering high order infinitesimal quantities is established. The model accurately considers the distribution characteristics of line parameters and meets the requirements of cable fault location in distribution network. On the basis of the model, the fault location equation is constructed based on the principle of equal zero-mode voltage from both ends of the line to the fault point. The equation is a time-domain differential equation, which is applicable to any voltage level. The transient steady state analysis of line parameters and length. To solve the problem that high order derivative is needed for zero mode signal, in order to obtain the high order derivative of zero mode signal, this paper presents a method of sinusoidal approximation fitting of zero mode signal. This method overcomes the shortcoming of difference approximation instead of large differential derivative error and improves the accuracy of ranging. Aiming at the lack of fine searching ability of local region in particle swarm optimization algorithm, a fault location algorithm based on particle swarm optimization and Newton iteration fusion is proposed to solve the fault distance. The single-phase grounding fault location method under different simulation conditions is simulated by ATP and MATLAB. The results show that the proposed method is effective and accurate.
【學(xué)位授予單位】：西安科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM862;TM75

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本文編號(hào)：2023741