Design And Research On Energy Feedback Type AC Electronic Load

High-power AC source has been widely applied in various fields of industrial production, so the power load test must be performed considering the safety and reliability of AC source. Traditional load test methods usually apply big resistance for discharging test. The big resistor discharge test not only cannot provide continuous load impedance which is able to simulating the actual working conditions of power supply, but also the power supply under test through the big resistance is converted into heat which result in waste of energy and bring seriously serious heat problem. Although the flexible adjustment function of the load is solved by the development of the traditional AC electronic load testing system, energy waste and high costs of heat dissipation remain. In order to saving energy and reducing radiation problem, a new type of AC electronic load with energy feedback is investigated in this paper. It can not only accurately simulate the real load in order to achieve the power load test, but also it can make the energy feedback to the AC grid in unit-factor to save the energy.Firstly, the PWM rectifier principle is analyzed in the thesis, according to the characteristics of its AC side current full control and Four-quadrant operation, the PWM rectifier is introduced into the energy feedback AC electronic load. The DC link double VSR topology is used in electronic load as the main topology;One cycle control is used to fully guarantee the control accuracy and speed. Secondly, the working principle of energy feedback electronic load is discussed in detail, and a simulation model of single-cycle control is set up in MATLAB/Simulation environment, and the simulation of static and dynamic conditions is made compared to the simulation model of PI control. The simulation results show that the performance of current tracking of single-cycle control is better, and then simulation studies of energy feedback unit is completed; Finally, the related hardware circuits and software of the energy feedback part are designed in detail, and Preliminary verify the correctness and validity of AC electronic load system with energy feedback.