摘要
为提高电梯制动能量回收系统的效率,针对四象限电压型变流器（VSC）小功率下效率低的弊端,提出结合超级电容储能的电梯电机能量回收系统的效率优化控制策略.系统通过VSC统一进行能量管理,消除了引入双向DC-DC变流器带来的开关损耗和滤波电感损耗,同时根据负载功率的不同情况来选择性地开启、关闭VSC,从而使系统始终运行在效率最优的状态中.由于VSC对超级电容的功率进行了限制、分流,因此避免了其他文献中出现的储能器端压变化大、容易超出范围的问题,增大了超级电容的利用率.最终通过模拟电梯系统负载的仿真和对照实验证明了该控制策略的可行性与稳定性,比单一四象限变流器能量回收系统的效率提高2.7％ ～23.2％.
In order to improve the efficiency of the elevator energy recovery system especially when the system is running in low power load, an optimal efficiency control strategy, which is based on super capacitors storage and VSC, is proposed. Because the power management of the elevator energy recovery system is all done by VSC mod-ule, the bi-direetional DC-DC is no longer needed in normal operation. And therefore, tlie energy losses of switches and inductor filters are avoided. And VSC is turned on and off in accordance with the change of load power. There-fore, the system is always running in the most energy-efficient state. Meanwhile, because the load current of capac-itor is well controlled and is split by VSC, the terminal voltage is easily controlled within the operational range. At last, the simulation and the experiment results verify the feasibility and stability of the control strategy, and about 2.7% to 13.9% more energy is saved than VSC working alone.
出处
《电工电能新技术》
CSCD
北大核心
2014年第2期22-28,共7页
Advanced Technology of Electrical Engineering and Energy
