Abstract
With the expansion of China's power grid, the scale, transmission distance and load capacity of transmission projects are all growing rapidly. Meanwhile, the problem of transmission line running state detection is also attracting more and more attention. Electric field under high voltage transmission line is taken as the research object in this paper, and the principle of electric field inverse operation is analyzed, two kinds of calculation objects and methods of nondestructive examination are are described in detail. There are two kinds of intelligent algorithms in this paper in order to solve the problem of several unknown solutions in inverse electric field operation. Correspondingly, the fitness function based on voltage value and result value is established, and the inverse electric field operation algorithm with global optimization function is proposed. A calculation example of high-voltage transmission line is also used to verify the inverse problem optimization algorithm. It is respectively proved by calculation results that the effectiveness and accuracy of the optimization method based on the two kinds of intelligent algorithms.
Highlights
Transmission line is a key part in power grid engineering, which is related to the safe and stable operation of power grid
The characteristics of solving electric field inverse problem are as follows:(1) It contains a large number of sparse coefficient matrices; (2) The search accuracy of solving parameters is in great demand; (3) Determining the optimal solution by constructing the fitness function value
The intelligent algorithm with global optimization and the CSM are introduced to solve the problem of inverse calculation
Summary
Transmission line is a key part in power grid engineering, which is related to the safe and stable operation of power grid. The status detection of transmission wires in smart grid mainly includes operating environment, wire sag, line voltage and so on[1]. The common detection method is to install the voltage transformer at the end of transmission lines. The global optimal solution of the inverse electric field problem under transmission line has not been involved in these studies. According to the characteristics of the electric field under the transmission line, the first chapter analyzes the electric field under the transmission line based on charge simulating method(CSM), and deduces the calculation method and application method of the inverse electric field operation. In order to solve the problem of inverse electric field operation, inverse electric field algorithms with global optimization function is proposed, which combines CSM and two kinds of intelligent algorithms respectively.
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