異常電能表查找系統(tǒng)研究
[Abstract]:The electric energy metering device is an important part of the power system. Whether the electric energy metering device is accurate or not will affect the fairness and accuracy of the electric power trade settlement and directly affect the actual interests of the electric power enterprises and users. Abnormal energy metering devices will harm the economic interests of power enterprises and users, and will lead to the failure of the power system to work properly. The positive error of the electric energy metering device will lead to the damage of the user's economic benefit, and the negative error of the power metering device will lead to the increase of the line loss in the station area, which will directly affect the economic benefit of the electric power enterprise. Therefore, the timely and effective positioning of abnormal watt-hour meters has received widespread attention. In this paper, a mathematical model is established from the point of view of abnormal line loss caused by abnormal power consumption, so as to achieve the purpose of locating abnormal watt-hour meter. Based on the research of abnormal watt-hour meter at home and abroad, this paper puts forward an abnormal watt-hour meter lookup system based on user information acquisition system. In this paper, the reason and performance of abnormal electric energy metering device are discussed and analyzed, and the research status of abnormal watt-hour meter at home and abroad is summarized. The anomaly of electric energy metering device will lead to abnormal line loss in the station area. By observing whether the line loss amount in the station area is abnormal or not, we can find out whether there is an abnormal power consumption in the station area. The anomaly of line loss is caused by the anomaly of some metering devices in the station area, and the greater the error of the measuring device, the greater the influence on the line loss. Through mathematical derivation, it is found that the linear relationship between the sampling value of the user's electricity quantity and the line loss of the station area is linear when some factors are reasonably excluded, and Pearson correlation coefficient method is used to describe the degree of the linear relationship between the two random variables. Therefore, the Pearson correlation coefficient method is used to calculate the correlation coefficient between the sampling value of electricity quantity and the line loss of the station area, and the higher the correlation coefficient is, the more likely it is that the higher the correlation coefficient is, the more abnormal it is to the line loss amount of the station area. When using Pearson correlation coefficient method to locate users of abnormal watt-hour meters, remarkable results have been achieved. However, some deficiencies of Pearson correlation coefficient method are found in the process of practice. In the process of application, it is found that the positioning accuracy of Pearson correlation coefficient method is not high when the user uses electricity for outdoor wire. Based on the theoretical analysis that the abnormal power consumption is not linearly related to the line loss of the station area, a threshold model based on the grey GM (1 / 1) model is proposed to locate the users of the abnormal watt-hour meter in this case. In this paper, the modeling mechanism of grey GM (1K1) model is analyzed, and the user load forecasting model is established by using the grey GM (1K1) model. At the same time, the problems existing in the grey GM (1K1) model are discussed, and the grey GM (1K1) model is modified by Markov chain algorithm. It overcomes the shortcomings of the original model and improves the prediction accuracy of the grey GM (1 ~ 1) model. Finally, on the basis of load forecasting value, using historical data and expert opinion to select appropriate threshold value, the user load threshold model is established. When the sampling value of user is not within the range of load threshold, the user is searched. Finally, on the basis of the information collection system, the paper establishes the abnormal watt-hour meter lookup system. This paper introduces the structure and design idea of the abnormal watt-hour meter lookup system in detail.
【學(xué)位授予單位】:東南大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2016
【分類號】:TM933.4
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