High-voltage SVG power unit driving circuit

Abstract

The invention discloses a high-voltage SVG (static var generator) power unit driving circuit which comprises four IGBT (insulated gate bipolar transistor) temperature input modules, a voltage frequency oscillation circuit module, an optical coupler isolation circuit module, a CPLD (complex programmable logic device) main control chip module, an SVG main controller, an IGBT driving circuit module and four IGBT PWM (pulse width modulation) output and protection signal output modules. A power supply required by the whole power unit driving board does not need to be independently powered by an external power supply, power is taken from the direct-current voltage input module, and power supply voltage required by the power unit board is generated through the four-way IGBT temperature input module; and the four-way IGBT temperature input module generates PWM signals through the UC2844 power management chip to drive the MOS tube to supply power to the flyback transformer to generate 24V power signals, needed voltage is generated through the DC-DC power conversion chip, the circuit has the advantages that the input voltage range is wide, the overcurrent and overvoltage protection function is achieved, the whole control is double-closed-loop control, the voltage fluctuation is small, and the efficiency is high. The power unit board has a four-path IGBT driving function and can drive two groups of double parallel IGBTs at the same time.

Description

technical field [0001] The invention relates to the technical field of power quality control, in particular to a high-voltage SVG power unit drive circuit. Background technique [0002] In the distribution network, the power quality of the power grid is usually measured by indicators such as stability, symmetry, and sine. With a large number of non-linear loads such as modern power electronic equipment connected to the power grid, the power supply quality of the power grid is seriously affected. The large number of applications of power electronic switching devices and frequent fluctuations in load are the most important sources of interference, resulting in a series of adverse effects, including: [0003] 1. The output system lacks timely reactive power adjustment, the system oscillation is easy to expand, and the stability of the transmission system is reduced; [0004] 2. The load center lacks fast reactive power support, which may easily cause low voltage or even voltag...

AI Technical Summary

Problems solved by technology

[0003] 1. The output system lacks timely reactive power adjustment, the system oscillation is easy to expand, and the stability of the transmission system is reduced;

[0004] 2. The load center lacks fast reactive power support, which may easily cause low voltage or even voltage collapse;

[0005] 3. The power factor is low, which will increase the loss of the power grid, increase the production cost and reduce the production efficiency;

[0006] 4. The generated reactive power impact causes the grid voltage to drop, voltage fluctuations and flicker, and in severe cases, traditional devices and protection devices cannot work normally or even shut down

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