矿用防爆锂电源均流系统设计

Design of current sharing system for mine explosion-proof lithium power supply

针对矿用防爆锂电源多台并联使用时放电不均流的问题,设计了一种矿用防爆锂电源均流系统。该系统由多台防爆锂电源并联组成,防爆锂电源采用166节60 A·h的磷酸铁锂电池串联在隔爆腔内;采用基于平均电流的数字均流策略,以均流控制器为电流调节部件,采用双闭环方式进行控制,系统内环为电流环,外环为电压环,在电压环的基础上增加一个均流补偿,通过电压偏差信号与均流补偿信号实现均流控制。测试结果表明:采用均流系统后,总负载电流为20 A时均流不平衡度为1%~2%,总负载电流大于30 A时均流不平衡度保持在1%以内;与无均流策略的电源相比,采用数字均流策略的电源并联均流效果更好,供电可靠性更高。

In order to solve the problem of uneven discharge current when multiple mine explosion-proof lithium power supplies are used in parallel,a current sharing system for mine explosion-proof lithium power supply is designed.The system is composed of several explosion-proof lithium power supplies connected in parallel.The explosion-proof lithium power supplies adopt 16660 A·h lithium iron phosphate batteries connected in series in the explosion-proof cavity.The digital current sharing strategy based on the average current is adopted,the current sharing controller is used as the current adjustment component,and the double closed-loop control is adopted.The inner loop of the system is a current loop,and the outer loop is a voltage loop.A current sharing compensation is added to the voltage loop.The current sharing control is realized through voltage deviation signal and current sharing compensation signal.The test results show that after the current sharing system is adopted,the current sharing unbalance degree is 1%~2%when the total load current is 20 A,and the current sharing unbalance degree is kept within 1%when the total load current is greater than 30 A.Compared with the power supply without current sharing strategy,the parallel current sharing effect of power supplies using digital current sharing strategy is better and the power supply reliability is higher.