牵引逆变器频率控制下的地铁车辆异步电机启动过热防控方法分析

本文针对地铁车辆中的牵引逆变器的频率控制中,地铁车辆的异步电机启动过热等问题进行了分析,并简单的对牵引系统等进行了概述.

Simulation study on the starting characteristics of a kind of improved direct torque control system

Analyzed working principle and starting process of asynchronous motor direct torque control system. In order to solve the problem of serious fluctuation of starting current in traditional control scheme, the author puts forward a new kind of starting method which can limit voltage value to achieve the goal of reducing fluctuation of the current by increasing zero voltage vectors during the stage of starting. The author has also carried on simulation study on the system, and the result of simulation study shows that this method is effectual.

蓬辣滩泄洪闸门监控系统改造

泄洪闸门是防洪泄洪的执行部件,在汛期期间闸门启动次数频繁,其可靠性直接关系着大坝、厂房及下游河道的安全。文中主要介绍了改造后新控制系统的特点,并从控制流程及系统的整体设计方面阐述了如何确保闸门控制系统的可靠性和安全性。