摘要
超特大容量高压电动机直接起动产生的大电流对电网以及电机本身都会造成巨大的冲击。得出了不同容量、不同电压等级的电机在直接起动过程中功率因数以及电磁转矩的变化规律。针对自耦降压起动存在二次冲击、串磁控电抗器起动成本过大等问题,提出了一种新型超特大容量高压电动机自耦磁控软起动的方法,分析了其基本工作原理。推算出软起动成本计算公式,并代入具体算例分析比较,得出了选择具有合适抽头比的自耦变压器,可以使得该软起动的成本大大降低的结论。最后仿真和实验的结果表明,在降低成本的前提下,该起动方法能够有效减小起动电流,消除二次冲击,响应速度快。
The large current generated by starting directly of super large capacity and high voltage induc-tion motor will have a huge impact on the grid as well as the motor itself. The variation of the power factor and electromagnetic torque during direct start of motors with different capacity and voltage levels were ob-tained. Aiming at the problem that the secondary impact of auto-transformer starter is large and the cost of magnetic control starter is high, the auto-transformer and magnetic control soft start method of super large capacity and high voltage motor was proposed and the basic working principle was analyzed. The calcula-tion formula of cost for magnetic control soft starter and auto-transformer and magnetic control soft starter was deduced, and specific examples were analyzed and compared. It is concluded that the choice of auto-transformer with appropriate tapping ratio reduces the cost of auto-transformer and magnetic control soft starter. The simulation and experiment results show that the start method effectively reduces the starting current, eliminate the secondary impact and has fast response speed.
作者
袁佳歆
王传盛
朱勇
董健鹏
田翠华
陈柏超
YUAN Jia-xin;WANG Chuan-sheng;ZHU Yong;DONG Jian-peng;TIAN Cui-hua;CHEN Bai-chao(School of Electrical Engineering and Automation,Wuhan University, Wuhan 430072,China)
出处
《电机与控制学报》
EI
CSCD
北大核心
2019年第4期67-74,共8页
Electric Machines and Control
基金
湖北省科技支撑计划(2014BAA013)
武汉市高新技术产业科技创新团队培养计划(2016070204020165)
关键词
超特大容量高压电动机
软起动
自耦降压
磁控电抗器
二次冲击
super large capacity and high voltage induction motor
soft start
auto-transformer buck
mag-netic controllable reactor
secondary impact
