Maximum Power Control Method for Two-branch Online Energy Extraction System

Abstract

Aiming at the problem that the fluctuation of the current on the cable causes the change of the parameters in the magnetic core, that is, the excitation inductance and the excitation resistance change, and the energy extraction system cannot maintain the resonance and the maximum power output, an online power extraction method combining the dual branch topology and the resonance power control is proposed. By controlling the PWM rectifier circuit, the load impedance is changed so that it is always equivalent to the matching impedance of CT. The parallel resonance state is maintained when the transmission line current changes in a wide range, so that more active power flows to the energy-taking branch to achieve the maximum energy-taking power and assure the normal operation of the energy source. The correctness of the proposed method is verified by Maxwell/Simulink software simulation.