中低压配电网馈线负荷时空分布特性研究
[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.
【学位授予单位】:昆明理工大学
【学位级别】:硕士
【学位授予年份】:2017
【分类号】:TM714
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