考虑制氢效率优化的氢-储-风直流微网功率协调控制

Power Coordinated Control for DC Microgrid with Hydrogen-Storage-Wind Power Considering Hydrogen Production Efficiency Optimization

利用风电等新能源制氢是提高新能源消纳能力的一种有效技术手段。为适应风电及负荷功率的波动性并确保制氢电解槽高效运行,提出一种考虑制氢效率优化运行需求的氢-储-风直流微网功率协调控制方法。根据制氢电解槽优化运行区间和直流母线电压波动范围,将直流微网划分为正常运行模式(即制氢电解槽优化运行)和极端运行模式(即制氢电解槽非优化运行)。在正常运行模式下,通过电解槽的自适应下垂控制和电池储能含虚拟电容的变系数下垂控制,将电解槽运行点维持在优化运行区间内,保证电解槽高效安全运行;在极端运行模式下,通过氢/储控制策略灵活切换以确保直流微网电压安全。所提协调控制方法不但可快速抑制风电及负荷功率波动所引发的直流母线电压波动,而且可维持制氢效率处于较高水平。最后,通过PSCAD/EMTDC的仿真算例分析验证了所提方法的有效性和优越性。

Hydrogen production from renewable energy,such as wind power,is an effective technical means to improve the accommodation capability for renewable energy.A power coordinated control method for DC microgrid with hydrogen-storagewind power considering optimized operation requirements of hydrogen production efficiency is proposed,which can adapt to the wind power and load power fluctuations and ensure the efficient operation of the hydrogen production electrolyzer.According to the optimized operation area of the hydrogen production electrolyzer and the range of DC bus voltage fluctuations,the DC microgrid is divided into normal operation modes(i.e.,optimized operation of hydrogen production electrolyzer)and extreme operation modes(i.e.,non-optimized operation of hydrogen production electrolyzer).In the normal operation modes,the operation point of the electrolyzer is maintained within the optimized operation area through the self-adaptive droop control of the electrolyzer and the variable coefficient droop control with a virtual capacitor of the battery energy storage to ensure the efficient and safe operation of the electrolyzer.In the extreme operation modes,the voltage safety of the DC microgrid is assured through flexible switching control strategies of hydrogen and storage.The proposed coordinated control method can not only rapidly suppress the DC bus voltage fluctuations caused by the wind power and load power fluctuations,but also maintain the hydrogen production efficiency at a high level.Finally,the effectiveness and superiority of the proposed method are verified through simulation cases of PSCAD/EMTDC.