Study On Single-phase Power Electronic Load With Energy Feedback

With the progress of science and technology, power electronic technologymatures gradually. Many new electronic devices with development of electronicdevice, including UPS, inverter power supply, generator and other equipment, havebeen widely applied in various fields. The power supply factory needs to testperformance. Traditional test includes use of capacitance, resistance, inductance andother components. But it has many shortcomings, such as large energy consumption,poor flexibility and waste of power with heat dissipation model. It can’t adapt torequirement of energy conservation and environmental protection.This dissertation briefs the present situation of the development of electronicload both at home and abroad. The research purpose and significance of the deviceare put forward. Based on the characteristic of PWM converter, it can control theinput current of the phase and amplitude, and run four-quadrant. It meets therequirement of this device. The two PWM converters are connected withback-to-back way. The intermediate DC link with large capacitance voltage stabilityand the entire unit load simulation are the core of the front unit.Since current in simulation of the load cell need for precise control, sothe modified repetitive control strategy is used to achieve the purpose of accurate current tracking quality. Bus voltage of system needs stable and the output current needsto be control, so double loop control is used to make the equipment runstable, and electricity grids with high efficiency into the grid. Then, the parameters ofthe design process are given. Based on the simulation environment of Saber07, thesimulation model of the whole system is built in this paper. The feasibility of solutionis proved by all kinds of load. Finally on the basis of simulation and DSP2812controller, the hardware circuit of system and auxiliary circuit are set up. The resultsshow that the study of power electronic equipment can simulate kinds of load andrealize energy feedback, and proofs of the validity and feasibility of this design.