The Research And Design Of Ship Borne Charge And Discharge Device Base On Three-level

In recent years, the tonnage of ships has been improved significantly with the changes of world situation and the rapid development of the naval career. Battery, as the energy storage device for shipboard equipment, whose performance and longevity are inseparable with the development of charge-discharge technology. Therefore, it is inevitable that to do some further research on reversible high-performance and grid connected charge-discharge device for ship. It is focus that how to make power factor close to 1, how to charge the battery intelligently,efficiently, harmlessly and how to make it none-polluting to power grid during discharge process for navy large capacity charge$discharge deviceThe topology and control strategy of the reversible charge and discharge device is researched, and the correctness of the scheme is verified by simulation. The main work of this thesis is as follow:The diode clamped three-level circuit is adopted according to the system requirements after researching the topology of three-level rectifier. Mathematical model and equivalent circuit are given based on the working principle.For the coupling of the control variables, control strategy of feedforward decoupling is designed, achieving the control the active power and reactive power separately, simplifying the design process of the controller.After researching on three level svpwm, to simplify the calculation of control chip. the method of judging the sector based on the region boundary is proposed. Main electrical components, signal sampling circuit and DSP power supply circuit are designed for the charging and discharging device. And the scheme is verified by building system simulation.