| Along with the depletion and environmental pollution problem of the traditional non-renewable energy is increasingly serious, the development of renewable energy has been paid more and more attention. In this context, the micro-grid technology using new energy power generation will become the new direction of the future development of the ship. Micro-grid with distributed energy storage unit to realize the flow of energy storage system, this paper adopts battery as micro-grid energy storage unit, bi-directional DC-DC converter to achieve two-way control charge and discharge management and energy flow of the battery.This paper first discusses the research background and significance of ship micro-grid energy storage technology, according to the requirements of the battery charge and discharge technology, analyzes several common bi-directional DC-DC converter topology, and according to the application characteristics of the micro-grid energy storage system, select the bi-directional Buck-Boost converter as the main topology structure of the energy storage system, and the main circuit, the soft start circuit and switch tube buffer circuit is analyzed and designed. Then according to the requirements of bi-directional DC-DC converter control system, the working pattern and small signal model are analyzed, double closed-loop control strategy of the converter is controlled by the outer voltage loop, inner current loop, and Buck working mode and Boost working model for the stability analysis and controller design. Finally, the bi-directional DC-DC converter has carried on the detailed design of hardware and software. The converter is mainly composed of main circuit, control circuit and human-computer interaction circuit. Hardware design content mainly includes the voltage, current and temperature sampling conditioning circuit design, IGBT drive circuit design based on the M57962L, PWM control circuit design based on TL494, current sharing control circuit design based on UC3902, as well as the hardware protection circuit design. MCU MSP430 chip to complete the software design and realization of human-computer interaction function, implementation of the converter system real-time monitoring and communication alarm.On the basis of theoretical analysis, a 5KW prototype is built and tested. Experimental results show that the bi-directional DC-DC converter device according to the system works stably and reliably, show the correctness and effectiveness of the theoretical analysis. |
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