Novel rotating rectifier with fault monitoring function

Abstract

The invention provides a novel rotating rectifier with a fault monitoring function, and relates to rotating rectifying systems. The invention aims at solving the problems that an existing rectifier is low in output power of an alternating-current exciter and high in harmonic component, a rotating rectifying controller cannot be timely started and a system fault exists. The novel rotating rectifier with the fault monitoring function comprises a three-phase triple voltage rectifying circuit, an alternating-current exciter, a rotating bridge rectifier module based on VIENNA, a start power module, a start resistor, a rotating rectifying controller, a synchronous electric exciter set, a fault detection module, a wireless communication device, a first wireless transceiving device, a second wireless transceiving device and an external monitoring module. According to the novel rotating rectifier with the fault monitoring function, a neutral-point potential balance method of injecting zero-sequence voltages is adopted, zero-sequence voltages VZ(+) and VZ(-) are injected into a three-phase reference voltage at different moments, and the problem is solved that two capacitor voltages of a direct current busbar are not balanced.

Description

technical field [0001] The invention relates to a novel rotary rectifier with a fault monitoring function and relates to a rotary rectifier system. Background technique [0002] With the continuous development of electromagnetic drive technology, rotating rectifiers have been widely used in industry. Each bridge arm of the traditional rotary rectifier uses a thyristor and a diode in series. The connection of this structure increases the harmonics on the AC exciter side and reduces the power factor, which restricts the development of the rotary rectifier; [0003] The turn-on voltage of the traditional power supply in the rotary rectifier is relatively high. When the induction voltage of the excitation winding of the synchronous motor is already high, the rotary rectifier controller still cannot turn on the starting power module, and it is easy to burn the insulation layer of the excitation winding; [0004] If there is an open circuit or short circuit in a bridge arm of the...

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Problems solved by technology

[0003] The turn-on voltage of the traditional power supply in the rotary rectifier is relatively high. When the induction voltage of the excitation winding of the synchronous motor is already high, the rotary rectifier controller still cannot turn on the starting power module, and it is easy to burn the insulation layer of the excitation winding;

[0004] If there is an open circuit or a short circuit in a bridge arm of the rotating rectifier module, it will cause an increase in the armature current and field current of the AC exciter. If the system cannot deal with the fault immediately, it will damage the device or even burn the entire system.

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