Research on High-Frequency Current Sensor and Measurement Method Based on Magnetic Sensor Array

In recent years, the rapid development of smart grid makes the grid structure more complicated. In order to ensure the stable, efficient and safe operation of the power grid, the smart grid puts forward higher requirements for the accuracy and real-time collection of information (including node current and voltage). Magnetic sensor array is usually placed in the surrounding space of multi-conductor system in a non-contact way to measure current. In order to study the theoretical errors caused by the topology of magnetic sensor array, based on the current measurement algorithm of discrete Fourier transform (DFT), the topology optimization model of magnetic sensor array is established with the objective function of solving the minimum condition number of coefficient matrix, and some optimization constraints are put forward. After studying the principle of optical current sensor, a current measurement method combining giant magnetostrictive material and fiber grating is adopted in this paper to achieve the purpose of measuring current. Using Visual C++software as the development platform, an experimental simulation platform for AC voltage/current intelligent sensor signal processing was created. Through a large number of simulation experiments, the signal processing methods based on the least mean error method, correlation analysis method, and the estimation of key sampling points based on Lagrange interpolation method and error LMS method were verified.