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High power factor cascade stage speed regulating device of phase-shifting chopped waves

A high power factor, cascaded speed regulation technology, applied in the direction of electrical components, control systems, AC motor control, etc., can solve the problems of device reliability reduction, overcurrent fault, uncontrollable rotor rectification current, etc., to achieve power factor and Effect of Reliability Improvement

Inactive Publication Date: 2009-12-30
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional cascade speed control system has disadvantages such as low power factor and large harmonic content, and most of the choppers in the internal feed chopper cascade speed control system used in industrial sites currently use open-loop control, and their dynamic performance is not good. , the rotor rectifier current is uncontrollable, and overcurrent faults are prone to occur, which reduces the reliability of the device, which affects the popularization and application of cascade speed regulation in fan and pump load speed regulation occasions

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  • High power factor cascade stage speed regulating device of phase-shifting chopped waves
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  • High power factor cascade stage speed regulating device of phase-shifting chopped waves

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Embodiment Construction

[0014] The principle of high power factor cascade speed control device based on phase-shift chopping is as follows: figure 1 shown. figure 1 It consists of two parts, the main circuit and the control circuit. The main circuit is composed of two parts, the inner feed motor 1 and the cascade speed control device. Wherein the inner feed motor is divided into three parts again, the stator winding (current flowing through is I s ), the rotor winding (the current flowing through is I r ), adjust the winding (the current flowing through is I f ); the cascade speed control device is composed of a rectification part (12-pulse rectification), a chopping part (phase-shifting chopping), and an inverter part (PWM rectifier). Among them, the rectifier part and the rotor winding of the inner-fed motor 1 are connected through the Y / Y / Δ transformer 2, and the difference between the secondary side coils is 30°. The output is composed of two rectifiers 3 and 4 to form a 12-pulse rectificatio...

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Abstract

The invention relates to a high power factor cascade stage speed regulating device of phase-shifting chopped waves. A rotor side of an inner feedback motor is connected with two three-phase rectifiers through a Y / Y / Delta transformer to form a 12-pulse rectifier for reducing the content of harmonic wave at the rotor side and improving the power factor of the rotor side; a direct current side of the rectifier is connected with a phase-shifting chopper to reduce direct current pulsation and improve the reliability and stability of the chopper; the back ends of two choppers are connected with a common bus; the two choppers feedback the inversed current to the power grid through a PWM rectifier, which can not only reduce the content of harmonic wave and improve the power factor, but also prevent inversion and subversion effectively. The invention can not only reduce the harmonic current at the rotor side, but also reduce the harmonic current at the inversed side, thus reducing the content of harmonic wave of the whole speed regulating device, and greatly improving the power factor of the cascade stage speed regulating device.

Description

technical field [0001] The invention relates to a cascade speed regulation technology, in particular to a high power factor cascade speed regulation device with phase shifting and chopping. Background technique [0002] my country is a country with a very short supply of power resources. As an important technical policy, energy conservation has a profound impact on the development of the national economy. Fans and water pumps are widely used in various sectors of the national economy, widely distributed, and consume huge amounts of electricity. According to statistics, the power consumption of fans and water pumps in the country accounts for more than 40% of the electricity consumption of the entire industry, and fans and water pumps generally need to perform load regulation during operation, and the corresponding flow rate must also be tracked and adjusted. The traditional adjustment method is to adjust the valve opening of the inlet or outlet, so that 30% to 40% of the el...

Claims

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Application Information

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IPC IPC(8): H02P27/04H02P27/08
Inventor 江友华曹以龙
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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