摘要
针对调压软起动器降低电流效果差且转矩不足,变频器昂贵且旁路困难等电机起动问题,打破直流供电局限,分析正弦供电下的空间电压矢量变频原理及磁链轨迹,将其应用于反并联晶闸管调压主电路,设计多级分频切换的软起动策略,研制了一种具有有级变频功能的正弦空间电压矢量软起动器。MATLAB系统仿真验证了其原理的正确性与方案的可行性,实验结果表明该软起动器可以起动带有额定负载的异步电机并且将起动电流限制在额定电流4倍以下。
In order to solve the problem that the voltage regulating soft starter＇ s electric current reducing effect is poor, in addition,it＇s lack of torque and the inverter are expensive beyond that it＇s difficult to bypass, this paper analysis the frequency changing theory and flux linkage locus of space voltage vector under sine power supply breaking the dc suppling limited, apply that to the voltage regulation circuit, design multistage switching frequency soft start strategy and develop sine space voltage vector of the soft starter which has the function of step frequency changing. The MATLAB simulation verifies the validity and feasibility. Experimental results show that the soft starter can start asynchronous motor with rated load and limit the start current under the four time of the rated current.
出处
《电子技术应用》
北大核心
2016年第9期133-137,142,共6页
Application of Electronic Technique
基金
国家自然科学基金(51577110)
关键词
正弦空间电压矢量
磁链轨迹
软起动策略
有级变频
sine space voltage vector
flux linkage locus
soft start strategy
step frequency changing
