独立海岛海水淡化直流微网能量管理策略研究

The research on energy management stratey for isolated sea-water desalination DC micro-grid

世界淡水资源不足,海水淡化已成为解决全球水资源紧缺的研究热点。针对包含风力发电机、储能系统以及海水淡化负荷的直流微网,提出了基于超短期风速预测的直流微电网实时能量管理调度策略。该控制策略分为小时前计划和实时运行两个阶段。针对小时前计划,提出了根据预测风功率及蓄电池的荷电状态确定海水淡化机组投切台数和投切方案的方法;针对实时运行阶段,提出了基于电压下垂特性的直流电压协调控制方案,在不同的运行工况下,通过蓄电池稳压、风电机组限功率运行及负荷减载,保证了直流电压的稳定。通过MATLAB/SIMULINK仿真,验证了在不同的运行工况下,所提海水淡化机组投切方案及电压协调控制策略的稳定性。

A serious shortage of freshwater resources is presented in the world today, and the desalination of sea water has become an important way to solve the global shortage of water resources. In this paper, a real time energy manage- ment strategy for isolated DC micro-grid consisting of wind power generation, energy storage system and sea-water de- salination system is presented based on the super short-term wind speed prediction. Firstly, in accordance with the re- suits of super short-term wind speed prediction and the state of charge of battery, the commitment of the desalination of sea water units is proposed. Secondly, a DC-link voltage coordination control scheme based on voltage droop charac- teristic is proposed, which ensures the stability of DC-link voltage by charging or discharging the battery, and limiting the power output of the wind turbine or load shedding under different operation conditions. Finally, the MATLAB/ SIMULINK simulations are carried out under different operation conditions and the results verify the effectiveness of the energy management strategy.