A Bi-directional DC-DC Converter For The Energy Storage Of Ship Dc Integrated Power System

Nowadays,ship DC integrated power grid has attracted more attention in the field of engineering ships due to its excellent energy-saving and working performance.The DC-DC converter has some main functions,such as DC voltage matching,charge-discharge management of storage battery and energy regulation of power grid.Therefore,the research of bidirectional DC-DC converter is of great significance.In this paper,we study the modeling,control and software-hardware design for the bidirectional DC-DC converter of ship DC integrated grid energy storage.Firstly,this paper introduces the research background and significance of the bi-directional DC-DC converter,expatiates the current research status of the DC integrated power grid and DC-DC converter,and expounds the existing problems in the modeling of DC-DC converter.Based on the previous results,the non-ideal model of DC-DC converter is established in consideration of the parasitic parameters.The,reasons for the poor high frequency anti-interference ability are analyzed.Secondly,a kind of broadband output filter,which effectively attenuates high-frequency noise and corrects the fourth-order model into two-order model,is designed for high-frequency interference.The voltage and current controllers of bidirectional DC-DC converter are designed by using frequency response method to improve the dynamic performance of the system.The stability of the system is demonstrated.Thirdly,the software and hardware of the bidirectional DC-DC converter are studied.We design structures and functions of the circuits,such as IGBT drive circuit,voltage/current sampling circuit,control circuit,protection circuit and auxiliary power.The program is compiled in keil-MDK environment,and the structure and flow of the system program are designed.Finally,a lOkW bidirectional DC-DC converter device is developed.The experimental results show that The bidirectional DC-DC converter is stable and reliable in operation,with small output voltage ripple,strong anti-interference ability and rapid dynamic response.The results verifies the validity of the proposed model and the feasibility of the design scheme.