High-power inter-harmonic current source and control method thereof

A technology of harmonic current and control method, which is applied in the field of high-power inter-harmonic current source and its control, and can solve problems such as industrial frequency power supply pollution

Active Publication Date: 2020-11-20
STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is to solve the technical difficulties that the current high-power inter-harmonic current source adopts the topology of back-to-back converters. At the same time, the current high-power inter-harmonic current Harmonic fluctuations are partially introduced into the input current, thereby causing pollution to the industrial frequency power supply

Method used

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  • High-power inter-harmonic current source and control method thereof
  • High-power inter-harmonic current source and control method thereof
  • High-power inter-harmonic current source and control method thereof

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Embodiment 1

[0030] This embodiment provides a high-power interharmonic current source, such as figure 1 It includes: an input isolation switch 101, a rectification circuit 103, a DC filter capacitor circuit 104, an inverter circuit 105 and an output isolation switch 107;

[0031] One side of the input isolation switch 101 is used to connect to the power frequency grid, and the other side of the input isolation switch 101 is connected to the AC input side of the rectifier circuit 103;

[0032] The DC output side of the rectifier circuit 103 is connected to the DC input side of the inverter circuit 105 by connecting the DC filter capacitor circuit 104 in parallel;

[0033] The AC output side of the inverter circuit 105 is connected to one side of the output isolating switch 107, and the other side of the output isolating switch 107 is used to connect to the test bus.

[0034] Optionally, the high-power interharmonic current source further includes an input filter circuit 102 and an output ...

Embodiment 2

[0042] This embodiment provides a control method for a high-power interharmonic current source, including:

[0043] Rectification side control: Use the DC voltage observer to predict the instantaneous fluctuation of the DC voltage, and use the fundamental wave active power prediction on the inverter side to realize the fundamental power feedforward, and the reactive power control target is zero. The block diagram of the rectification side control algorithm in this embodiment is as follows image 3 shown;

[0044] Inverter side control: add the fundamental current command and each inter-harmonic current command as the total command current, the current inner loop adopts P (proportional) controller, adds the test bus voltage feedforward and divides it by the DC voltage to generate Modulate the wave and compare it to the triangular carrier.

[0045] Such as image 3 It is a block diagram of the rectification side control algorithm in this embodiment. The control method on the ...

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Abstract

The invention relates to a high-power inter-harmonic current source and a control method thereof, the control method comprises rectification side control and inversion side control; in the rectification side control, a DC voltage observer is adopted to predict instantaneous fluctuation of DC voltage, and inversion side fundamental wave active power prediction is used to realize fundamental wave power feedforward, and a reactive power control target is zero. According to the rectification side control method, a direct-current voltage state observer is adopted to replace a traditional constant direct-current voltage reference value, and it is guaranteed that rectification side input current does not contain inter-harmonic components; inverter side fundamental wave active power prediction isadopted, a rectification side power loop is added, and the rectification side power tracking speed is ensured.

Description

technical field [0001] The present application relates to the technical field of power electronic equipment, in particular to a high-power interharmonic current source and a control method thereof. Background technique [0002] With the wide application of nonlinear devices such as power electronic components in power systems, the resulting harmonics will pollute the power grid more and more seriously, and the problem of harmonics has attracted widespread attention. Harmonics can be divided into integer multiple harmonics and inter-harmonics, among which there are few studies on inter-harmonics, and their influence and harm are one of the focuses in the field of harmonic research in recent years. [0003] Interharmonics are often caused by large voltage fluctuations or impact nonlinear loads. All nonlinear fluctuation loads, such as arc welding, electric welding machines, various frequency conversion speed control devices, synchronous cascade speed control devices and induct...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M5/458H02M1/12
CPCH02M5/4585H02M1/126
Inventor 刘书铭王毅李琼林代双寅张博唐钰政郑晨朱明丽李尚盛孙建军查晓明
Owner STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST
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