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Frequency converter harmonic suppression circuit

A harmonic suppression and frequency converter technology, which is applied to electrical components, irreversible AC power input conversion to DC power output, output power conversion devices, etc., can solve the inconvenience of installation, high cost of frequency converter harmonic suppression, and large volume and other problems, to achieve the effect of easy installation, effective harmonic filtering effect, and small size

Pending Publication Date: 2021-02-09
上海华电奉贤热电有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a frequency converter harmonic suppression circuit, which solves the problems of high cost, large volume and inconvenient installation of current frequency converter harmonic suppression

Method used

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  • Frequency converter harmonic suppression circuit

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Embodiment

[0023] Such as figure 1 As shown, a frequency converter harmonic suppression circuit, which includes a phase-shifting capacitor 1, a phase-shifting reactor 2, a first group of three-phase rectifier bridge 3, a second group of three-phase rectifier bridge 4, a first filter capacitor 5, a second Two filter capacitors 6, step-up contactors 7;

[0024] The three input terminals of the AC power supply of the first group of three-phase rectifier bridge 3 are respectively connected to the corresponding phase lines of the three-phase AC power supply through three identical phase-shifting capacitors 1;

[0025] The three input terminals of the AC power supply of the second group of three-phase rectifier bridge 4 are respectively connected to the corresponding phase lines of the three-phase AC power supply through three identical phase-shifting reactors 2;

[0026] The DC output terminals of the first group of three-phase rectifier bridges 3 and the second group of three-phase rectifie...

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Abstract

The invention discloses a frequency converter harmonic suppression circuit, and belongs to the technical field of rectification circuits. The frequency converter harmonic suppression circuit comprisesa phase-shifting capacitor, a phase-shifting reactor, a first group of three-phase rectifier bridges, a second group of three-phase rectifier bridges, a first filter capacitor, a second filter capacitor and a boost contactor, three wire inlet ends of the alternating-current power supply of the first group of three-phase rectifier bridges are respectively connected to corresponding phase lines ofthe three-phase alternating-current power supply through three same phase-shifting capacitors; three wire inlet ends of the alternating-current power supply of the second group of three-phase rectifier bridges are respectively connected to corresponding phase lines of the three-phase alternating-current power supply through three same phase-shifting reactors; and the direct current output ends ofthe first group of three-phase rectifier bridges and the second group of three-phase rectifier bridges are connected in parallel to a frequency converter direct current bus. The frequency converter harmonic suppression circuit has the advantages of good filtering effect, convenience in installation, the small size, low cost and the like, and improves the low-voltage ride-through capability of thefrequency converter.

Description

technical field [0001] The invention relates to a frequency converter harmonic suppression circuit, which belongs to the technical field of rectification circuits. Background technique [0002] The rapid development of frequency converters in terms of energy saving has also resulted in a situation where the power factor has dropped and the harmonic pollution is serious. This not only greatly increases the temperature rise loss of the motor operating at power frequency, but also often leads to insulation failures of distribution transformers and voltage transformer fuses. For power supply accidents such as abnormal fusing, zero-sequence harmonics can easily lead to overcurrent in the neutral line, and the neutral line generally has no overcurrent protection, and fires caused by harmonics are not uncommon. Not only greatly reduces the high energy-saving effect, but also causes secondary problems such as shortened life and high failure rate of a large number of motors, transfor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/14H02M7/25
CPCH02M1/14H02M7/25
Inventor 李广一杨欢红朱涛刘新超朱伟星金瀚濛吴信立侯必骁杨小玲郭思远周春峰郭超朱子叶
Owner 上海华电奉贤热电有限公司
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