混合储能系统拓扑及其多模式综合协调控制

Topology of Hybrid Energy Storage System and Its Multi-mode Integrated Coordinated Control

在分布式发电系统中,储能系统要同时具备高功率密度和高能量密度的特点,单种储能元件往往难以达到这个要求,蓄电池与超级电容在性能上具有很强的互补性。此处将蓄电池与超级电容分别通过双向半桥变换器连接到直流母线上构成混合储能系统(HESS),蓄电池稳定直流母线电压以维持母线上能量供需平衡,超级电容迅速提供负载波动功率高频分量,抑制负载突变对直流母线造成的冲击。分析了负载功率高频分量的检测方法,建立了双向半桥变换器的数学模型和4种模式下的控制策略。利用DSP实现储能系统的综合控制,通过仿真和实验验证了系统控制策略的有效性。

In distributed power generation system,energy storage system should possess high power density and high energy density simultaneously.Single kind of energy storage device is hard to meet the requirements.Hybrid energy storage system(HESS)is a good solution for this problem.Battery and ultracapacitor can complement each other in performance,and they are connected to DC bus by a corresponding bidirectional half-bridge converter.The battery maintains the voltage stability of the DC bus.The ultracapacitor provide the high-frequency components of all load of the DC bus to mitigate the impact when load changes.The detection method of the high frequency components of the load power is analyzed.The mathematical model of bidirectional half-bridge converter and four kinds of mode control strategies are established.DSP is used to realize the integrated control of the energy storage system.The effectiveness of the control strategies is verified by the results of software simulation and experiments.