In an AC system with parallel operation of electricity-hydrogen micro-grids,when adopting traditional control methods,the difference in output line impedance will affect inverters,and large circulating currents occurs such that a reasonable distribution of active power become inaccessible.Given the relationship between the voltage deviation and the active power,the active power distribution between multiple micro-grids is analyzed.Firstly,the AC system model of the electric-hydrogen hybrid energy-storage micro-grid is constructed,including photovoltaic,battery,fuel cell,and electrolyzer.Secondly,following the relationship between the active power and the voltage in the reverse droop control,a reverse droop control based on power following control is proposed to work out voltage deviation and auto-adjust the rated active power.Finally,within a parallel operation of electric-hydrogen micro-grids,the proposed method is compared with other methods and is verified by hardware-in-the-loop experiments on the platform of RT-LAB.The experimental results show that the proposed method outperforms other methods:the accuracy of power distribution after stabilization is 97.50％,the accuracy of the bus voltage is 99.86％,and the circulating current mostly ranges in[-3.0,3.0]A.
关键词
电-氢微电网/混合储能/功率控制
Key words
electric-hydrogen microgrid/hybrid energy storage/power control
维普
万方数据