Two-circuit power supply high-voltage frequency converter unit bypass device based on thyristor

A technology of high-voltage frequency converter and dual power supply, which is applied in the direction of circuit devices, DC network circuit devices, output power conversion devices, etc., can solve the problems of huge energy waste, achieve small size, low cost, and improve operation stability Effect

Inactive Publication Date: 2016-03-16
WOLONG ELECTRIC GRP LIAONING RONGXIN ELECTRIC TRANSMISSION CO LTD
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  • Abstract
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  • Application Information

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Problems solved by technology

However, most of the industrial high-voltage and high-power AC motors in my country currently use direct constant-speed dragging, which is a huge waste of energy.

Method used

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  • Two-circuit power supply high-voltage frequency converter unit bypass device based on thyristor
  • Two-circuit power supply high-voltage frequency converter unit bypass device based on thyristor
  • Two-circuit power supply high-voltage frequency converter unit bypass device based on thyristor

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Embodiment

[0043] The structure and working principle of the multi-level cascaded high-voltage inverter are as follows: Figure 5 As shown, its working principle is that the input transformer adopts a phase-shifting transformer, that is, the primary side of the transformer adopts the extension triangle connection method, and the secondary side is a multi-winding output, and each group of outputs is different from each other by a certain electrical angle, so as to suppress the input harmonic current. Purpose. The output adopts multi-level phase-shifting PWM, and the triangular carrier waves of different series units in the same phase have a certain phase difference from each other to increase the output voltage step, improve the equivalent switching efficiency, and improve the output waveform. Figure 6 It is the output waveform of each unit. Because of the series connection form, multiple complete waveforms are finally output, which can be directly used for motor drive. Since the input ...

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Abstract

The invention discloses a two-circuit power supply high-voltage frequency converter unit bypass device based on a thyristor. The two-circuit power supply high-voltage frequency converter unit bypass device comprises a two-circuit power supply AC (Alternating Current) / DC (Direct Current) power supply, a thyristor driving plate, a thyristor and an anti-parallel diode rectifier bridge of the thyristor, wherein the two-circuit power supply AC / DC power supply supplies power to the thyristor driving plate; the thyristor driving plate communicates with a unit control plate through a fiber; the thyristor driving plate is connected with the thyristor to control the thyristor to be switched on and off; and the thyristor provided with the diode rectifier bridge is connected to the output end of the high-voltage frequency converter unit in parallel. When devices including an IGBT (Insulated Gate Bipolar Translator), a rectifier module and the like in a power unit fail, a function that the power unit and other power units are removed is realized. The two-circuit power supply high-voltage frequency converter unit bypass device adopts a two-circuit power supply way, and is provided with a thyristor adsorption circuit to effectively adsorb a voltage spike generated when the thyristor acts, and therefore, the reliability of a power unit bypass system is greatly improved.

Description

technical field [0001] The invention relates to a high-reliability unit bypass device for a high-voltage frequency converter using a thyristor as a core device and adopting dual-circuit power supply. Background technique [0002] my country's energy production and energy consumption have been ranked among the top in the world, but they still cannot meet the needs of industrial production and people's life development. Therefore, how to save energy has become very important in today's energy shortage. However, most of the high-voltage and high-power AC motors used in my country's industries currently use direct constant-speed dragging, resulting in a huge waste of energy. If it is operated with frequency conversion speed regulation technology, the energy saving effect is very obvious. Therefore, the development and application of high-voltage and large-capacity AC motor frequency conversion speed regulation energy-saving system is of great significance to the reduction of en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J1/10H02J9/06H02M1/32
CPCH02J1/102H02J9/061H02M1/32H02M1/325
Inventor 张春雷周翔胡彦国庚德正周辉张丹曹鹏
Owner WOLONG ELECTRIC GRP LIAONING RONGXIN ELECTRIC TRANSMISSION CO LTD
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