摘要
当三相电网不平衡时,三相电网供电的变频空调容易因网侧电流突变而触发过流保护停机。为了增强三相变频空调在电网不平衡下的容错运行能力,文章探明了三相电网不平衡下的可控裕量与输入输出电压调制比、电网电压不平衡度之间的关系,并提出了不可控区域的退化Boost控制。实验结果表明,采用该控制方案的三相变频空调即便在电网缺一相时仍能输出较高的功率。
When the three-phase power grid is unbalanced,the variable-frequency air conditioner powered by the three-phase power grid is prone to shutdown because sudden changes in the current on the grid side trigger overcurrent protection.In order to enhance the fault-tolerant operation ability of three-phase variable-frequency air conditioners under unbalanced power grids,the article verifies the relationship between the controllable margin under unbalanced three-phase power grids and the input-output voltage modulation ratio and the voltage imbalance degree of power grids,and proposes a degraded Boost control for uncontrollable areas.The experimental results show that the three-phase variable-frequency air conditioner that uses this control scheme can still output higher power even when one phase of the power grid is missing.
作者
胡斌
龙谭
HU Bin;LONG Tan(Guangdong Midea Refrigeration Equipment Co.,Ltd.,Foshan,Guangdong Province,528311 China)
出处
《科技资讯》
2023年第23期105-108,共4页
Science & Technology Information
关键词
电网不平衡
三相维也纳功率因数校正
容错控制
电网缺相
Unbalanced power network
Three-phase Vienna power factor correction
Fault-tolerant control
Phase loss in the power network
