电-氢孤岛直流微电网的分层能量管理

Hierarchical Energy Management for Electric-Hydrogen Island Direct Current Micro-grid

为了实现电-氢混合储能微电网的控制与运行,提出一种该类孤岛直流微电网的全天候能量管理方法,在满足负载需求功率、控制母线电压的基础上,将微网多余电能向化学能及氢能转化,且将储存的能量通过燃料电池及蓄电池适时运用于微网功率缺额的情况;通过对各电源、负载设备DC/DC变换器控制以及管理层的协调控制,实现了该系统的能量管理;基于MATLAB/Simulink软件平台,验证了该文能量管理方法的有效性.研究结果表明:电-氢微电网在运行过程中母线电压波动幅度小于0.33%,远小于5.00%的运行要求;锂电池等效荷电状态及储氢罐等效荷电状态初末值变化幅度分别为4.0%和0.2%,储能系统运行稳定;该能量管理方法能够在保持电-氢系统稳定运行的前提下,无需外界提供额外能量即可确保该系统的全天候正常运行.

In order to realize the control and operation of the electric-hydrogen hybrid energy storage micro-grid,an all-weather energy management method for the kind of island direct current(DC)micro-grid was proposed.The energy management method based on meeting the power demand of the load and controlling the bus voltage,and the method aimed to converse the surplus power from the micro-grid to chemical energy and hydrogen energy and released the energy timely through fuel cells and batteries.By the control of the coordination of the management layer and the DC/DC converter of the power and loading equipment,the energy management was realized.The effectiveness of the energy management method was verified based on the Matlab/Simulink software platform.The results show that the fluctuation of bus voltage is less than 0.33%which is far below the operation requirement of 5.00%,and the differences between the initial and final value of state of charge and state of hydrogen charge is 4.0%and 0.2%,respectively,the storage system operates stably.The energy management method can ensure the stability of the energy storage system and keep all-weather running without additional energy.