The extinction angle of the DC converter, which is usually used to study the commutation failure of the DC inverter, is an important parameter in the DC transmittal system.
直流换流器熄弧角是直流输电系统的重要电气量，常被用于判断直流输电系统逆变器的换相失败。
In this paper, it is mainly introduced the electrical principles of soft -start inverter with load commutation on synchronous machine, and described the general models of synchronous machine.
文中主要介绍了同步电机负载换相变频软启系统的电气原理。
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