Arc furnace power quality controller based on programmable logic controller (PLC)

A power quality, electric arc furnace technology, applied in flexible AC transmission systems, AC networks to reduce harmonics/ripples, harmonic reduction devices, etc., can solve problems such as increasing costs, unable to achieve continuous adjustment, etc., to improve the compensation effect. , The effect of reducing high-order harmonic content and flexible control

Inactive Publication Date: 2012-02-15
TIANJIN UNIVERSITY OF TECHNOLOGY
View PDF4 Cites 10 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] SVC has a variety of structures: thyristor-controlled reactor type, which is itself a harmonic source, filters out the harmonics generated by the electric arc furnace and generates new harmonics; thyristor-controlled reactor type, which does not generate harmonics itself, but cannot realize continuous regulation
[0005] Static sy...

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Arc furnace power quality controller based on programmable logic controller (PLC)
  • Arc furnace power quality controller based on programmable logic controller (PLC)
  • Arc furnace power quality controller based on programmable logic controller (PLC)

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Embodiment 1: Electric arc furnace power quality controller based on PLC

[0045] This example provides an electric arc furnace power quality controller based on S7-400PLC. The power quality controller system is as follows: figure 1 As shown, the electric arc furnace used in the present invention is a three-phase AC electric arc furnace, and the power quality controller is installed on the low-voltage side of the electric arc furnace transformer, and the detection unit transmits the detected three-phase instantaneous voltage and current data to the single control system, and the The control unit calculates and selects a control strategy to form a trigger pulse to control the reactive power compensation device.

[0046] The principle of the control system is as figure 2As shown, the DSP receives and processes the collected instantaneous voltage and current values, calculates the number of TSCs required to be invested in combination with the furnace condition informatio...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention relates to an arc furnace power quality controller based on a programmable logic controller (PLC), which mainly comprises a control system and a power quality improvement system, wherein the control system consists of an industrial personal computer, a PLC and a digital signal processor (DSP); and the power quality improvement system consists of thyristor switched capacitor - thyristor controlled reactor (TSC-TCR) reactive power compensation device and an auxiliary circuit. The controller can adjust compensation parameters in real time to improve compensation accuracy according to instantaneous reactive power in combination with furnace condition information. The arc furnace power quality controller based on the PLC has the advantages that the rapid real-time compensation can be realized aiming at the change of the reactive power and the power factor, the operating cost is low and the control stability is high.

Description

technical field [0001] The invention belongs to the field of steelmaking equipment, and relates to a power quality controller for a three-phase AC electric arc furnace. The control system is composed of an industrial computer, PLC and DSP. The compensation system is a TSC TCR reactive power compensation device, which is suitable for various capacities. three-phase AC electric arc furnace. Background technique [0002] Electric arc furnace is the main equipment for modern steelmaking. With the industrial requirements of high productivity, low energy consumption, low material consumption and high environmental protection indicators, modern electric arc furnace is developing towards the direction of ultra-high power and ultra-large capacity. However, with the increase of capacity and power, power quality problems such as harmonics, voltage fluctuations and flicker, and low power factor brought about by the operation of electric arc furnaces have become more and more prominent. ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): H02J3/18H02J3/01
CPCY02E40/10Y02E40/40
Inventor 赵辉唐微王红君岳有军
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap