A three-stage synchronous generator transient overvoltage suppression circuit and its realization method

Abstract

The present invention proposes a three-stage synchronous generator transient overvoltage suppression circuit and its implementation method. The circuit includes a generator three-phase voltage sampling circuit, an effective value calculation circuit, a DSP processing circuit, an IGBT drive circuit, and an energy absorption circuit; When the output overvoltage of the three-stage synchronous generator is detected, the DSP outputs a voltage regulation prohibition signal to the voltage controller to cut off the excitation current of the exciter. The form of heat is rapidly lost. After a certain period of time, the DSP outputs a PWM signal with a variable duty cycle according to the current collected overvoltage value and sends it to the power absorbing resistor control switch IGBT. The power absorbing resistor is put in to quickly suppress the transient overvoltage. Smooth transition of voltage to normal range. This method can effectively suppress the overvoltage caused by high-power load removal or other working conditions, and quickly and smoothly transition the overvoltage to the steady-state working voltage before the main contactor is disconnected, so as to realize uninterrupted power supply.

Description

technical field [0001] The invention belongs to the field of aviation AC power generation systems, and relates to a three-stage synchronous generator transient overvoltage suppressing circuit and a realization method thereof. Background technique [0002] With the development of aviation multi-electric technology, loads have entered an era characterized by high power. When the system performs high-power load shedding or energy feedback load impact, due to the protection delay characteristics of the three-stage synchronous generator voltage controller and the inherent response time of the contactor, before the contactor performs the disconnection operation, the generator terminal The output voltage has seriously exceeded the voltage threshold of the national military standard, and a serious overvoltage phenomenon occurs at the output terminal, which leads to failure of subsequent electrical equipment or system-level protection. [0003] When the existing aviation three-stage...

AI Technical Summary

Problems solved by technology

TVS has fast response speed and small size, but has a large capacitance (tens to hundreds of pF), low current resistance, and only a certain number of breakdown voltages. Due to the large load current of the aero-generator, the TVS is likely to be burned out , low reliability

Varistors are not reliable due to their life times and breakdown short-circuit failure modes

In the harsh aviation power working environment, none of the above-mentioned three main means of suppressing transient overvoltage can quickly suppress the overvoltage and smoothly transition to the steady-state safe voltage within the time specified by the national military standard. Load equipment provides uninterrupted power supply

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