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Hybrid-frequency-controlled harmonic current generator

A harmonic current generation device technology, applied to harmonic reduction devices, AC networks to reduce harmonics/ripples, etc., can solve the problems of narrow harmonic frequency band, cumbersome adjustment, small capacity, etc., to expand the range and improve operating conditions, the effect of improving reliability

Inactive Publication Date: 2011-09-14
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the harmonic current generator used to verify the compensation effect of various treatment equipment has problems such as narrow harmonic frequency band, small capacity, low precision, and cumbersome adjustments.

Method used

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Embodiment Construction

[0012] The main circuit structure diagram of a mixed frequency control harmonic current generator proposed by the present invention is shown in the attached figure 1 As shown, it consists of single-phase rectifier transformer 1, PWM rectifier H-bridge module 2, discharge branch 3, low-frequency cascaded H-bridge module 4, high-frequency H-bridge module 5, high-frequency connection reactance 6, low-frequency connection reactance 7 and system connection The entry point is composed of 8.

[0013] After the single-phase rectifier transformer 1 steps down the AC power, N PWM rectifier H-bridge modules 2 are charged respectively through N low-voltage windings to establish a DC bus voltage. A discharge branch 3 is connected in parallel to the DC bus of each PWM rectifier H-bridge module.

[0014] N PWM rectification H-bridge modules are divided into two groups, one group consists of a PWM rectification H-bridge module, its DC bus is connected to the input end of the high-frequency H...

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Abstract

The invention provides a hybrid-frequency-controlled harmonic current generator, belonging to the field of dynamic electric power quality control techniques. The generator comprises a single-phase rectifier transformer (1), a PWM (pulse width modulation) rectifier H bridge module (2), a discharge branch (3), a low-frequency cascading H bridge module (4), a high-frequency H bridge module (5), a high-frequency connecting reactor (6), a low-frequency connecting reactor (7) and a system AP (access point) (8), wherein the high-frequency H bridge module (5) generates harmonic currents of 11-31 orders and the low-frequency cascading H bridge module (4) generates harmonic voltages of 2-10 orders, and the high-frequency H bridge module (5) and the low-frequency cascading H bridge module (4) form harmonic current superposed output at the system AP (8) by the high-frequency connecting reactor (6) and the low-frequency connecting reactor (7) respectively. The generator expands the generation range of the harmonic currents remarkably, is reduced in overall switching loss, realizes decoupling control among modules with different frequencies, improves working conditions of power electronic devices, and intensifies reliability.

Description

technical field [0001] The invention belongs to the technical field of dynamic power quality control, and in particular provides a hybrid frequency control harmonic current generator. Background technique [0002] Harmonics in the power system can lead to hazards such as heating of electrical equipment, increased loss, increased vibration, and increased noise, and it is necessary to control them. However, the harmonic current generator used to verify the compensation effect of various treatment equipment has problems such as narrow harmonic frequency band, small capacity, low precision, and cumbersome adjustment. [0003] A mixed frequency control harmonic current generating device disclosed in the present invention is composed of a high-frequency harmonic constant current source and a low-frequency voltage source to form a mixed frequency harmonic current generating device, which has high harmonic bandwidth, large capacity, good control accuracy, and adjustable convenient....

Claims

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Application Information

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IPC IPC(8): H02J3/01
CPCY02E40/40
Inventor 尹忠东单任仲朱小帆安勇李勇钢李鹏
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)