Research Of Sine Wave Energy Feedback Device

The sine-wave energy feedback device, an energy-saving device, is able to transfer mechanical energy to electrical energy and send it back to electrical network. It has a broad application prospect in variable frequency drive system which has advantages of high power factor.The main work for the study of sine wave energy feedback device completed in this paper is as follows:Firstly, the development of energy feedback device is introduced. After a brief introduction to the structural characteristics and performance index, this paper focuses on working principle. Both low and high frequency models are established in ABC coordinate,αβcoordinate and dq coordinate respectively.Secondly, the key technologies of the device were discussed, such as: method of softly connect to the grid in a proper time, SVPWM, the current closed-loop control strategy of grid connected inverter, islanding detection and so on. At the same time, then simulative and experimental results are conducted here.Finally, energy feedback system model was built in Matlab for simulation and experiments were carried out in the developed prototype. Simulation and experimental results are consistent with theoretical analysis conclusions, which verify the correctness of the analysis.