18-pulse-based SVPWM three-phase electronic voltage regulator

Abstract

The invention discloses an 18-pulse-based SVPWM three-phase electronic voltage regulator. The voltage regulator comprises a main circuit, a central control circuit, an output voltage detection circuit, an overcurrent detection circuit, a pulse isolation amplifying circuit, a keyboard and display circuit, a first control power supply and a second control power supply, wherein the main circuit comprises a three-phase uncontrollable rectifier, a direct current filter and a three-phase IGBT inverter; and the central control circuit comprises a microprocessor and a pulse separation output circuit. The output alternating current voltage of the voltage regulator provided by the invention is subjected to an 18-pulse space voltage vector pulse width modulation technology and voltage closed loop control, so that the voltage regulator is high in power factor, low in harmonic and high in voltage stability; the shortcomings of low power factor, high harmonic and low voltage stability of thyristor phase-shifting control are overcome; an iron core and a winding of the conventional electromagnetic inductance type voltage regulator are not required, so that the voltage regulator is light in weight, small in volume and convenient to carry; and in addition, the voltage regulator is simple in circuit structure and reliable, and can be widely applied to any occasions requiring variable power supply voltages.

Description

technical field [0001] The invention relates to power electronics and electric energy conversion technology, in particular to a three-phase electronic voltage regulator with high power factor and low harmonic. Background technique [0002] Most of the voltage regulators currently used are electromagnetic induction voltage regulators or electronic voltage regulators controlled by thyristor phase shifting. The former needs iron cores and windings. The iron core is used to form a magnetic circuit, and the winding is used to generate induced voltage. Its weight Heavy, non-ferrous metal consumption is large, copper loss and iron loss will occur when the voltage regulator is working, the loss is large, resulting in low efficiency; and the latter, due to the use of phase shifting to control the output voltage, when the output voltage is low, the phase shifting The larger the angle, the lower the power factor and generate excessive reactive power and harmonics. Contents of the inv...

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Problems solved by technology

[0002] Most of the voltage regulators currently used are electromagnetic induction voltage regulators or electronic voltage regulators controlled by thyristor phase shifting. The former needs iron cores and windings. The iron core is used to form a magnetic circuit, and the winding is used to generate induced voltage. Its weight Heavy, non-ferrous metal consumption is large, copper loss and iron loss will occur when the voltage regulator is working, the loss is large, resulting in low efficiency; and the latter, due to the use of phase shifting to control the output voltage, when the output voltage is low, the phase shifting Larger angle, resulting in lower power factor, while generating excessive reactive power and harmonics

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