计及最小使用成本及储能状态平衡的电-氢混合储能孤岛直流微电网能量管理

Energy Management for Islanded DC Microgrid With Hybrid Electric-hydrogen Energy Storage System Based on Minimum Utilization Cost and Energy Storage State Balance

随着微电网技术的日渐发展,微电网中储能系统逐渐多元化,电储能及氢储能与微电网的运行控制产生紧密联系,如何经济地运行不同种类储能系统成为学者关注的焦点。提出一种基于最小使用成本及储能状态平衡的电–氢混合储能孤岛直流微电网能量管理方法,该方法在满足微电网基础指标即电压稳定、功率平衡的基础上,结合使用成本最小算法及等效氢耗最小算法,对使用电–氢混合储能消纳光伏产生的多余电能以及释放能量用于功率缺额等情景进行最小化储能系统使用成本及维持储能系统储能状态稳定的优化控制,通过对各系统的直–直变换器层控制以及顶层的协调控制确定各储能系统的工作状态,从而完成系统的能量管理。通过RT-LAB半实物系统开展实时仿真,在实际工况下进行72h运行,验证所提方法的有效性,保证系统在实际工作中的经济型及稳定性。

With development of microgrid technology, the energy storage systems in microgrid are gradually diversified, and storage of electric and hydrogen energy are closely related to operation control of microgrid. Economic control of different kinds of energy storage systems becomes attention focus of related experts. In this paper, an energy management method based on minimum utilization cost and energy storage state balance is proposed for islanded DC microgrid. On the basis of maintaining power balance and voltage stability, this method combines minimum cost algorithm and the equivalent consumption minimization algorithm for minimizing utilization cost and maintaining stability of storage system under circumstances of power surplus or bus vacancy. Through control of DC converter and coordination control of top layer, working state of energy storage system is determined, and energy management realized. Real-time simulation is carried out in RT-LAB semi-physical system. By a 72-hour operation under actual working condition, effectiveness of the proposed method is verified, ensuring economy and stability of the system in actual work.