Optimal Sensor Placement for Conductor Temperature Estimation of Overhead Extra-High Voltage Power Transmission Lines
Date Issued
2014
Date
2014
Author(s)
Wan, Jie-Jyun
Abstract
Dynamic thermal rating (DTR) technique is an effective and proper method to manage transmission lines in power system. Dynamic thermal rating utilizes on-line thermal sensors to monitor the operating temperature of overhead transmission lines, and calculates the ampacity margin of the transmission lines. The power transmission efficiency could be improved while under the safe condition. However, deploying a large number of thermal sensors may not be a viable option, because of high equipment costs and increasing the structural complexity of the power grid. A case study of the 345 kV extra high voltage transmission lines in central Taiwan was presented. The goal in this study is to allocate the minimum number of thermal sensors. Using the measurements where deploy the thermal sensor, the conductor temperature of whole transmission lines can be efficiently accurate estimation. This paper proposed an allocating placement method which is using the proper orthogonal decomposition (POD) for temperature feature extraction, and then using the memetic algorithm (MA) for determining the minimum number of thermal sensors and the optimal sensor placement to track the temperature of transmission lines and accurately estimate the full conductor temperatures. The results show that this method can be made only needs the one-fifth of sensors to estimate the conductor temperature of entire transmission line spans with high accuracy. The average mean square error is less than 1. This method can provide the operating power system a dependable technique for thermal capacity increment and the evaluation of overload risk.
Subjects
動態熱額定容量
導體溫度估計
輸電線
最佳感測器位置
Type
thesis
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