Electric power is output to the oil tube,which is connected with the bushing by the oil bushing connecter on the bottom of the oil tube,via a 3-phase transformer after AC-DC-AC inverse circuit.

A new kind of frequency-converting timing system of short phase-shifting current mode circuit was introduced in view of the defects of inverse circuit of series-wound diode current mode,which is widely adopted in frequency-converting timing systems.

A new kind of frequency converting timing system of short phase shifting current mode circuit was introduced in view of the defects of inverse circuit of series wound diode current mode,which is widely adopted in frequency converting timing systems.

Design and control of the inverter circuit for the rotor of double-fed machine;

PWM control technology is the most popular technology in inverter circuit.

In order to reduce the coupling of three-phase in inverter,the power supply uses three single-phase inverters to form one three-phase inverter,constitutes a combined inverter circuit,and re-duces the influence among three-phase in a more excellent way.

For the characteristrics of nonlinearness of inverters which cannot use an accurate mathematical model for fault diagnosis, a novel algorithm based on wavelet analysis and neural networks is presented to detect and diagnose inverters.

By the principle of SPWM, the inverter and mortor model based on the Power System Blockette in MATLAB software is established.