Elliptical arrays of tunnelling magnetoresistance sensors for rectangular busbar current measurement

The integration of numerous distributed energy resources and power electronic devices introduces a wide spectrum of frequency disturbances, which significantly challenge the stability of modern power systems. Therefore, there is an urgent need to enhance the current monitoring level of modern power systems. This paper proposes a novel busbar current inversion scheme based on an elliptical magnetic sensor array. By establishing a simulation model, the effect of structural parameters of the elliptical array on its current measurement accuracy was analysed. The anti-interference capability of the elliptical array in complex environments such as busbar displacement and crosstalk was studied, and principles for designing array parameters under different current sensor standards were established. Experiments conducted on the proposed current sensing scheme demonstrated that the designed current array has a range of 0–150 A, with a current measurement error below 0.1% without external interference and not exceeding 1% during busbar displacement. Under conditions of crosstalk, the measurement accuracy achieved was class 0.5. The sensor array possesses high measurement accuracy, robust anti-interference capability, low power consumption, compact size and a noncontact nature. It exhibits significant potential for extensive application in novel business scenarios within the power system.