The Design And Implementation Of Energy Storage Device Based On Lithium-ion Battery

The increasing capacity of grid-connected renewable energy power generation brings new challenges to the control of power grid. The control technology of power grid based on energy storage device is expected to become an important method to meet this challenge. The development of electric vehicle makes the energy storage methods including lithium-ion battery develop rapidly. Based on analysis of existing energy storage devices at home and abroad, the dissertation designs and completes a new energy storage system based on lithium-ion battery. The mail circuit and control part are studied and electrical parameters are designed through simulation. The energy storage system is proved to be effective through debugging, testing.Firstly, this dissertation points out that the energy storage can well solve the problems induced by distributed generation systems and the domestic and international research status is present. The related theory of device realization is systematically analyzed, such as the design of energy storage configuration, battery capacity and the way of battery power configuration. The battery state of charge (SOC) detection and voltage detection are designed and implemented, and also the battery energy management is simulated in MATLAB to achieve the charge and discharge control of battery. The commonly used interface circuit in energy storage device is deeply studied, including converter topology, PWM control, working mode, power flow analysis, software and hardware design and the coordination control between converter and DC/AC. The author participated in design of overall energy storage systems based on lithium-ion battery, and gave the parameters of important components. The device achieves data exchange with inverter by the control of CAN communication. The dissertation gave the performance index and experimental waveforms this device can achieve, which indicate that the energy storage devices can be applied in the research of DG system, power quality and other areas. Finally, from the perspective of power-lack batteries being re-used, the "lack" lithium battery in electric vehicle and energy storage system is also studied. Firstly, the electrical characteristic of "lack" lithium battery is simulated, and then the charge and discharge control is conducted through multiple application modes.