本文選題：配電網(wǎng) + 矩陣算法改進��； 參考：《華北電力大學(xué)》2014年碩士論文

【摘要】：隨著國民經(jīng)濟的發(fā)展和人民生活水平的提高,各電力用戶對電力系統(tǒng)供電可靠性提出越來越高的要求,配電網(wǎng)作為與用戶直接相連的環(huán)節(jié),提高其供電可靠性對改善電力系統(tǒng)的可靠性具有重要意義。本文主要研究配電網(wǎng)中破壞性較大、故障特征明顯的短路故障的定位方法。 首先,針對不含DG配電網(wǎng)故障區(qū)段定位方法——矩陣算法容錯性差的缺點對矩陣算法進行改進。增加評價函數(shù)評價矩陣算法故障區(qū)段定位結(jié)果的拆分組合,選出使評價函數(shù)值最小的拆分組合作為故障區(qū)段定位的結(jié)果,這種處理方式提高了矩陣算法的容錯性。然后研究了基于免疫算法的配電網(wǎng)故障區(qū)段定位,并與基于遺傳算法的定位進行了對比,對比結(jié)果表明免疫算法根據(jù)個體親和度和濃度選擇下代個體的方法可避免算法快速陷入局部最優(yōu)。 接著,又研究了適用于短路故障的基于節(jié)點阻抗矩陣的配電網(wǎng)故障測距方法,故障發(fā)生后,先形成等效系統(tǒng)故障前的節(jié)點阻抗矩陣,在此基礎(chǔ)上形成增加虛擬節(jié)點后等效系統(tǒng)的節(jié)點阻抗矩陣,該節(jié)點阻抗矩陣中包含未知量故障距離,再由支路追加法形成增加過渡電阻后包含未知量故障距離和過渡電阻的各節(jié)點的自阻抗和節(jié)點之間的互阻抗,并根據(jù)節(jié)點阻抗的物理意義建立測距表達式,同時提出采用靜態(tài)電壓特性的負(fù)荷模型模擬負(fù)荷,通過仿真分析知該方法測距精度高、具有一定的抗過渡電阻能力。 文章最后分析了DG接入對不含DG配電網(wǎng)故障區(qū)段定位方案的影響,提出通過限制DG的接入容量,合理設(shè)定開關(guān)定值的方法,滿足饋線開關(guān)上報故障信息的選擇性,使得不含DG配電網(wǎng)的故障區(qū)段定位方案適用于含DG的配電網(wǎng),并基于此研究了DG的最大準(zhǔn)入容量和饋線的最長供電距離,最后給出了DG接入容量超過限制時,含DG架空配電網(wǎng)的故障區(qū)段定位解決方案。
[Abstract]:With the development of the national economy and the improvement of the people's living standard, the power users put forward more and more high requirements for the power supply reliability of the power system, and the distribution network is a link directly connected with the users. It is of great significance to improve the reliability of power system by improving its power supply reliability. This paper mainly studies the localization method of short-circuit fault which is destructive and has obvious fault characteristics in distribution network. Firstly, the matrix algorithm is improved to solve the problem that the fault section location method without DG is poor fault tolerance of matrix algorithm. The split combination of fault section location results of evaluation function evaluation matrix algorithm is added, and the split combination with minimum evaluation function value is selected as the result of fault section location. This processing method improves the fault tolerance of matrix algorithm. Then, the fault section location of distribution network based on immune algorithm is studied and compared with the location based on genetic algorithm. The comparison results show that the immune algorithm can avoid the algorithm falling into local optimum quickly by selecting the next generation individual according to the individual affinity and concentration. Then, the fault location method based on node impedance matrix for short circuit fault is studied. After the fault occurs, the node impedance matrix before equivalent system failure is first formed. On this basis, the node impedance matrix of the equivalent system after adding virtual nodes is formed. The node impedance matrix contains unknown fault distance. Then the self-impedance and mutual impedance of each node containing unknown fault distance and transition resistance are formed by the branch addition method, and the location expression is established according to the physical meaning of node impedance. At the same time, a load model with static voltage characteristics is proposed to simulate the load. The simulation results show that the method has high accuracy and resistance to transition resistance. Finally, the paper analyzes the influence of DG access on fault section location scheme of distribution network without DG, and puts forward a method to meet the selectivity of fault information reporting by feeder switch by limiting the access capacity of DG and setting the switching value reasonably. The fault section location scheme without DG is suitable for the distribution network with DG. Based on this, the maximum access capacity of DG and the longest power supply distance of feeder are studied. Finally, when the access capacity of DG exceeds the limit, the maximum access capacity of DG is given. Fault section location solution for overhead distribution network with DG.
【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM711

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本文編號：1956511