Inverter brushless excitation system for separated intermediate-frequency transformer based on IGBT (Insulated Gate Bipolar Translator) technology

Abstract

The invention discloses an inverter brushless excitation system for a separated intermediate-frequency transformer based on an IGBT (Insulated Gate Bipolar Translator) technology and belongs to the technical field of excitation systems. The inverter brushless excitation system is characterized by comprising a power frequency alternating current power supply, wherein a rectifying module is connected to the power frequency alternating current power supply; an LC (Liquid Crystal) filter circuit and an IGBT inverter circuit are sequentially connected between a positive electrode and a negative electrode of a direct current power supply outputted by the rectifying module; an intermediate-frequency separated rotary transformer is connected to the IGBT inverter circuit. The invention aims to provide the inverter brushless excitation system for the separated intermediate-frequency transformer based on the IGBT technology, wherein the inverter brushless excitation system has the advantages of low system manufacturing cost, high working efficiency, energy conservation and small size of the separated intermediate-frequency transformer, and is used for exciting a generator.

Description

technical field [0001] The present invention relates to an excitation system, more specifically, to a separate intermediate frequency transformer inverter brushless excitation system based on IGBT technology. Background technique [0002] The excitation system is a device and its ancillary equipment that provide DC excitation current to the rotor winding (also known as the excitation winding) of the synchronous generator. There are many types of excitation systems for synchronous generators. At present, the excitation systems commonly used for small and medium-sized hydro-generators are as follows: [0003] (1) DC exciter excitation system: DC exciter is actually a DC generator specially used for synchronous generator excitation, installed coaxially with the generator, mainly composed of stator, rotor and commutator; [0004] The main features of the DC exciter excitation system are relatively simple, independent excitation power supply, work is not affected by the power gr...

AI Technical Summary

Problems solved by technology

The main disadvantage is: its excitation power comes from the generator terminal, which is affected by the voltage change of the generator terminal

[0009] Disadvantages: ① Excitation control is realized by adjusting the excitation of the exciter, and the response speed is slow;

[0010] ② It is impossible to carry out routine detection on the excitation circuit of the generator (rotor current, voltage, insulation and fusing signal);

[0012] ④ The length of the main shaft of the generator is increased, and the investment is increased;

[0013] ⑤ The rotor of the exciter adopts a cantilever structure with a single fulcrum, which is prone to vibration and even sweeping of the stator and rotor of the exciter;

[0014] ⑥ When the generator is running, the excitation circuit rotates together with the main shaft, so it is impossible to de-excite directly

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