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

A technology of electric energy quality and electric arc furnace, applied in flexible AC transmission system, AC network to reduce harmonics/ripples, harmonic reduction devices, etc. Sub-harmonic content, improved compensation effect, flexible control effect

Inactive Publication Date: 2013-11-20
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • 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 synchronous compensator STATCOM can quickly provide capacitive reactive power and inductive reactive power, stabilize voltage, improve system stability, and improve system dynamic performance. For large-capacity, high-power electric arc furnace systems, using STATCOM can get better Compensation effect, but this also greatly increases the cost

Method used

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  • 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

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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...

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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

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/18H02J3/01
CPCY02E40/12Y02E40/10Y02E40/40
Inventor 赵辉唐微王红君岳有军
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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