【摘要】：近些年來,由于農(nóng)村地區(qū)農(nóng)業(yè)現(xiàn)代化的發(fā)展使得用電設(shè)備大量增加,中低壓配電網(wǎng)的供電能力逐漸無法適應(yīng)與日俱增的用電需求,導(dǎo)致中低壓配電網(wǎng)饋線運(yùn)行常常出現(xiàn)問題,其中低電壓問題顯得尤為突出。中低壓配電網(wǎng)中母線電壓主要受上級電網(wǎng)控制,臺區(qū)負(fù)荷變化特性對其影響不大;而中低壓配電網(wǎng)的饋線電壓不同,其由于負(fù)荷所在地理位置不同的客觀因素以及負(fù)荷時(shí)間上不同的變化規(guī)律的綜合影響,使得饋線的沿線電壓變化較大。目前,對于配電網(wǎng)變電站側(cè)負(fù)荷特性的研究已經(jīng)取得良好的效果,但饋線中各臺區(qū)差異性變化的負(fù)荷特性研究還相對較少。本文對西雙版納地區(qū)中低壓配電網(wǎng)饋線的現(xiàn)狀進(jìn)行了研究,利用計(jì)量自動化系統(tǒng)中采集到的電壓監(jiān)測數(shù)據(jù)以及功率監(jiān)測數(shù)據(jù)進(jìn)行實(shí)測數(shù)據(jù)負(fù)荷建模,對中低壓配電網(wǎng)饋線中出現(xiàn)的問題進(jìn)行研究。以西雙版納地區(qū)中低壓配電網(wǎng)中存在的低電壓問題為例,對該地區(qū)線路各個(gè)監(jiān)測點(diǎn)統(tǒng)計(jì)數(shù)據(jù)統(tǒng)一進(jìn)行了梳理分析,整理了出現(xiàn)低電壓問題的主要地區(qū)以及主要時(shí)間段;首先研究了計(jì)量自動化采集數(shù)據(jù)的清洗辦法,利用雙向比較法對錯(cuò)漏數(shù)據(jù)進(jìn)行修復(fù);其次研究了數(shù)據(jù)修復(fù)后的聚類辦法,對修復(fù)后的數(shù)據(jù)進(jìn)行平滑、歸一化處理,根據(jù)公變負(fù)荷在生活時(shí)段負(fù)荷較高,而專變負(fù)荷在工作時(shí)段負(fù)荷較高的用電行為差異,得到不同類型用戶各具特點(diǎn)的日負(fù)荷曲線,利用K-means聚類算法基于其簇內(nèi)形狀相似、簇間距離較遠(yuǎn)的聚類模式進(jìn)行負(fù)荷分類,掌握該地區(qū)負(fù)荷特性;最后根據(jù)負(fù)荷特性,提出基于實(shí)測負(fù)荷數(shù)據(jù)對中低壓配電網(wǎng)低電壓問題的分析方法,根據(jù)待分析的配電網(wǎng)饋線線路搭建仿真系統(tǒng),基于負(fù)荷特性按時(shí)間順序進(jìn)行負(fù)荷建模,將實(shí)際線路運(yùn)行情況在仿真中重現(xiàn),以分析負(fù)荷時(shí)空分布特性對中低壓配電網(wǎng)低電壓問題的影響,確定造成低電壓問題的主導(dǎo)負(fù)荷因素,制定相應(yīng)的低電壓治理方案。
[Abstract]:In recent years, due to the development of agricultural modernization in rural areas, the power supply capacity of the medium and low voltage distribution network has been increasing greatly, and the power supply capacity of the medium and low voltage distribution network is gradually unable to adapt to the increasing demand for electricity, which often leads to problems in the operation of feeder lines of the medium and low voltage distribution networks. Among them, the problem of low voltage is particularly prominent. The busbar voltage in medium and low voltage distribution network is mainly controlled by the higher power network, but the load variation characteristics of the station area have little effect on it. However, the feeder voltage of medium and low voltage distribution network is different, because of the comprehensive influence of the objective factors of different geographical location of load and the varying law of load time, the voltage along the feeder line changes greatly. At present, the research on the side load characteristics of the distribution network substation has achieved good results, but the load characteristics of different stations in the feeder are relatively small. In this paper, the current situation of feeder of medium and low voltage distribution network in Xishuangbanna area is studied. The load modeling of measured data is carried out by using voltage monitoring data and power monitoring data collected in metering automation system. The problems in feeder of medium and low voltage distribution network are studied. Taking the low voltage problem in the medium and low voltage distribution network in Xishuangbanna area as an example, the statistical data of various monitoring points in this area are combed and analyzed, and the main areas and time periods of the low voltage problems are sorted out. Firstly, the cleaning method of data collected by measurement automation is studied, and the method of bidirectional comparison is used to repair the data. Secondly, the clustering method after data repair is studied, and the data after restoration is smoothed and normalized. According to the difference of electricity consumption behavior between the public variable load and the special variable load in the life period, the special variable load is higher in the working period. The daily load curves of different types of users are obtained, and the K-means clustering algorithm is used to classify the load based on the cluster pattern which is similar in shape and distance between clusters, so as to master the load characteristics in this area. Finally, according to the load characteristics, a method to analyze the low voltage problem of the medium and low voltage distribution network based on the measured load data is proposed. The simulation system is built according to the feeder line of the distribution network to be analyzed, and the load modeling is carried out according to the time sequence of the load characteristics. In order to analyze the influence of time and space distribution characteristics of load on the low voltage problem of medium and low voltage distribution network, the main load factors causing the low voltage problem are determined, and the corresponding low voltage treatment scheme is worked out.
【學(xué)位授予單位】：昆明理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM714

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本文編號：2385560