【摘要】：含分布式發(fā)電的配電網(wǎng)故障定位與供電恢復(fù)策略研究是保證配電系統(tǒng)安全穩(wěn)定運(yùn)行的重要環(huán)節(jié),確�？焖贉�(zhǔn)確地判定并找到故障,對于充分保障電網(wǎng)安全,防止大規(guī)模停電事故具有重要意義。完善的供電恢復(fù)策略,對于提高供電可靠性具有重要意義。因此,本文圍繞含分布式發(fā)電的配電網(wǎng)故障定位算法和供電恢復(fù)策略展開研究。首先,針對目前分布式發(fā)電大規(guī)模接入配電網(wǎng)使得原有故障定位算法精度降低甚至失效等不足,結(jié)合π型線路模型和過渡電阻消耗無功功率為零的特性,提出了通用于各種故障類型的改進(jìn)阻抗型故障測距算法。為量化各分布式電源提供的短路電流,建立了有源配電網(wǎng)的故障點電流和逐條線路區(qū)段電壓、電流的計算方法。并在此基礎(chǔ)上利用各電源接入點FTU裝置的監(jiān)測數(shù)據(jù),建立了考慮線路損耗的負(fù)荷功率迭代計算方法,降低負(fù)荷波動對故障測距算法精度造成的嚴(yán)重影響。仿真分析驗證了不同故障情況下所提方法的有效性。其次,通過確定分布式電源升壓并網(wǎng)變壓器繞組接線方式,研究了分布式電源升壓并網(wǎng)變壓器在四種接線方式下,中性點經(jīng)消弧線圈接地的含分布式發(fā)電的配電網(wǎng)單相接地故障的電流特性,建立了基于零序電流突變量的故障選線與定位算法。該故障處理時序流程中,先利用分布式電源接入后單相接地故障時各電氣量諧波含量增加,提出了基于零模電壓暫態(tài)突變能量的接地故障啟動判據(jù)算法。通過電力電子開關(guān)調(diào)節(jié)消弧線圈參數(shù),利用消弧線圈調(diào)節(jié)前后的錄波數(shù)據(jù)計算零序電流突變量,提出了根據(jù)零序電流幅值變化量特性進(jìn)行故障定位的小電流接地含分布式發(fā)電的配電網(wǎng)在線故障定位算法。最后,針對供電恢復(fù),提出了基于廣度優(yōu)先搜索算法、綜合考慮分布式電源類型與運(yùn)行特性、聯(lián)絡(luò)開關(guān)可操作性以及負(fù)荷優(yōu)先級等因素的孤島劃分策略,并建立了孤島穩(wěn)定裕度指標(biāo)衡量孤島區(qū)域可持續(xù)穩(wěn)定運(yùn)行能力。對于供電恢復(fù)中分布式電源的再并網(wǎng)問題,擴(kuò)展了FTU同期并網(wǎng)功能模塊,制定了基于改進(jìn)V/f控制策略的快速調(diào)節(jié)并網(wǎng)措施。通過在PSCAD仿真軟件搭建了含分布式發(fā)電的配電網(wǎng)模型對分布式電源再并網(wǎng)進(jìn)行仿真,驗證了FTU同期并網(wǎng)功能模塊和基于改進(jìn)V/f控制策略的并網(wǎng)調(diào)節(jié)措施之間協(xié)調(diào)配合的可行性。
[Abstract]:The study of distribution network fault location and power supply recovery strategy with distributed generation is an important link to ensure the safe and stable operation of distribution system. It is of great significance to prevent large-scale power outages. Perfect power supply recovery strategy is of great significance to improve the reliability of power supply. Therefore, this paper focuses on the distributed generation distribution network fault location algorithm and power supply recovery strategy. First of all, in view of the shortcomings of the current distributed power generation large-scale access to the distribution network, the original fault location algorithm accuracy is reduced or even invalidated, combined with the 蟺 type line model and the characteristics of zero reactive power consumption of the transition resistance. An improved impedance fault location algorithm for various fault types is proposed. In order to quantify the short-circuit current provided by each distributed power supply, the calculation method of fault point current and voltage and current of each line in active distribution network is established. Based on the monitoring data of each power access point FTU device, an iterative calculation method of load power considering line loss is established to reduce the serious influence of load fluctuation on the accuracy of fault location algorithm. Simulation results show the effectiveness of the proposed method in different fault cases. Secondly, through the determination of the winding connection mode of the transformer connected to the grid by the distributed power source, the paper studies the four connection modes of the transformer connected to the grid by the boost voltage transformer of the distributed power source. Based on the current characteristics of single-phase grounding fault in distribution network with distributed generation, a fault line selection and location algorithm based on zero sequence current mutation is established. In the sequence flow of fault processing, the harmonic content of each electrical quantity increases when the single-phase grounding fault is connected with distributed power supply, and a starting criterion algorithm of grounding fault based on the transient abrupt energy of zero-mode voltage is proposed. The parameters of the arc-suppression coil are adjusted by power electronic switch, and the zero sequence current abrupt quantity is calculated by using the recording data before and after the arc-suppression coil adjustment. An on-line fault location algorithm for distribution network with small current grounding and distributed generation is proposed, which is based on the characteristics of zero sequence current amplitude variation. Finally, aiming at power recovery, an islanding strategy based on breadth-first search algorithm is proposed, which considers the type and operation characteristics of distributed power supply, the maneuverability of contact switch and load priority, and so on. The index of island stability margin is established to measure the sustainable and stable operation ability of isolated island region. In order to solve the problem of reconnection of distributed power supply in power supply recovery, this paper extends the function module of FTU synchronization, and formulates the fast adjustment and connection measures based on the improved V / F control strategy. The distribution network model with distributed generation is built in the PSCAD simulation software to simulate the reconnection of distributed generation. The feasibility of coordination and coordination between the FTU simultaneous grid-connected function module and the grid-connected regulation measures based on the improved V / F control strategy is verified.
【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】：2017
【分類號】：TM732

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本文編號：2415726