CN105624417A - Method for controlling electro-slag furnace power - Google Patents
Method for controlling electro-slag furnace power Download PDFInfo
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- CN105624417A CN105624417A CN201410605557.8A CN201410605557A CN105624417A CN 105624417 A CN105624417 A CN 105624417A CN 201410605557 A CN201410605557 A CN 201410605557A CN 105624417 A CN105624417 A CN 105624417A
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Abstract
The invention discloses a method for controlling electro-slag furnace power. The method comprises the following steps that 1, working parameters are detected, specifically, voltage and electric currents of a short net which is in series connection between a magnetic voltage regulator and an electro-slag furnace electrode are detected in real time through a voltage transformer and a current transformer correspondingly, the weight of an electro-slag furnace crystallizer is detected in real time through a weighing sensor, and the temperature in a water tank at the bottom of the electro-slag furnace crystallizer is detected in real time through a temperature sensor; 2, power measurement data are obtained; 3, a fuzzy PID controller conducts self-adjusting on PID parameters through a fuzzy algorithm according to the given voltage and the actually measured voltage; 4, the electro-slag furnace power is automatically adjusted; and 5, smelting process monitoring and running failure warning are conducted. The method for controlling the electro-slag furnace power is simple in step, convenient to achieve and low in input cost. An intelligent fuzzy control system is adopted, so that the control precision and the product quality are improved, and the practical problems that an existing electro-slag furnace control method is unreasonable and constant-power smelting is difficult to achieve are solved.
Description
Technical field
The present invention relates to a kind of control method, especially relate to a kind of method that electroslag furnace power is controlled.
Background technology
Electroslag furnace is a kind of consutrode utilizing melting current to produce heat energy fusing insertion slag bath, and metal drop is crystallized into the special smelting equipment of one of ESR ingot in water mold, is the requisite production equipment of special steel plant after being cleaned by slag liquid. Along with economic construction development, it is desirable to smelter provides the special steel material of high-quality low-cost, finely excellent and high purity. Therefore metallurgical industry must be constantly brought forth new ideas on process equipment, and adopts the purpose of the state-of-the-art technology accurate, efficient, volume increase and consumption reduction to realize its production process.
Traditional electroslag furnace Poewr control method often rule of thumb carries out manual adjustments by analog circuits such as operation amplifiers, there is the shortcoming such as equipment failure rate height, big, the unstable product quality of maintenance; Although existing digital control method is better than analog control method, but it is all generally regulate device by rise fall of electrodes to control electroslag arc current and electroslag arc voltage, and actual current and spread of voltage, fluctuation are big, therefore do not reach the purpose that invariable power is smelted, have impact on control accuracy and product quality.
Summary of the invention
The technical problem to be solved is in that for above-mentioned deficiency of the prior art, a kind of method that electroslag furnace power is controlled is provided, its step is simple, it is convenient to realize, and can effectively solve existing control system for electroslag furnace control mode unreasonable and be difficult to reach the practical problem that invariable power is smelted.
For solving above-mentioned technical problem, the technical solution used in the present invention is: a kind of method that electroslag furnace power is controlled, it is characterised in that comprise the following steps:
Step one, running parameter detects: adopt voltage transformer summation current transformer respectively the voltage and current being serially connected in the short net between magnetic voltage regulator and electrode in electroslag furnace to be detected in real time; Adopt LOAD CELLS that the weight of crystallizer for electroslag furnace is detected in real time; Adopt temperature sensor that the temperature in the bottom water tank of crystallizer for electroslag furnace is detected in real time;
Step 2, power measurements obtains: the voltage and current data detected are transferred to Type Active Power Converter by photoelectrical coupler by described voltage transformer summation current transformer, Type Active Power Converter obtains power data after described voltage and current data are carried out computing and converts described power data to corresponding standard current signal, described Type Active Power Converter is by the current signal transfer of output to I/V change-over circuit, and I/V change-over circuit converts described standard current signal to corresponding voltage signal and is transferred to fuzzy controller; Described voltage transformer summation current transformer all connects with photoelectrical coupler, and described photoelectrical coupler, Type Active Power Converter, I/V change-over circuit and fuzzy controller connect successively;
Step 3, fuzzy parameter tuning: given voltage data is transferred to fuzzy controller by master controller; First described given voltage and I/V change-over circuit are transmitted the virtual voltage come and calculate accordingly by fuzzy controller, draw voltage deviation signal E and deviation variation rate signal EC, then using fuzzy algorithmic approach that pid parameter is adjusted, its parameter tuning step is as follows:
Voltage deviation E and deviation variation rate EC excursion are defined as the domain in fuzzy set, and its fuzzy subset is E, EC={NB, NM, NS, ZO, PS, PM, PB}, element in this fuzzy subset represents negative big respectively, in negative, negative little, zero, just little, center, honest, by E and EC according to this fuzzy subset's obfuscation;
Set up fuzzy reasoning table, obtain proportionality coefficient variation delta Kp, integral coefficient variation delta Ki and differential coefficient variation delta Kd corresponding to different voltage deviation E and deviation variation rate EC;
E and EC and the value of above-mentioned �� Kp, �� Ki and �� Kd according to the previous cycle carry out adaptively correcting, draw current Proportional coefficient K p, integral coefficient Ki and differential coefficient Kd;
According to the discrete control algolithm of PID, calculate the output voltage centrifugal pump of fuzzy controller;
Step 4, electroslag furnace Power auto-adjustment: fuzzy controller is controlled shifting to triggering circuit according to described output voltage centrifugal pump, shift to triggering circuit output pulse voltage the angle of flow of bidirectional triode thyristor is controlled, the output average voltage of rectification circuit is adjusted by bidirectional triode thyristor, the melting voltage of electrode in electroslag furnace is adjusted by magnetic voltage regulator according to the output average voltage of described rectification circuit, thus reaching the power to electroslag furnace to carry out the purpose of constant control; Described fuzzy controller, shift to triggering circuit, bidirectional triode thyristor, magnetic voltage regulator and electrode in electroslag furnace connect successively;
Step 5, smelting process monitoring and operation troubles are reported to the police: described LOAD CELLS is by the weight data real-time Transmission of crystallizer for electroslag furnace that detects to master controller, and the burn-off rate of electrode is monitored by master controller according to described weight data; Described temperature sensor is by the temperature data real-time Transmission in the crystalliser feet water tank that detects to master controller, and described temperature is adjusted by master controller by temperature controller; When burn-off rate is too fast or temperature is too high, master controller drives Alarm Unit to send alarm signal; Described LOAD CELLS, temperature sensor and Alarm Unit all connect with master controller, and described temperature controller connects with temperature sensor and master controller respectively.
A kind of above-mentioned method that electroslag furnace power is controlled, is characterized in that: described master controller is industrial computer.
A kind of above-mentioned method that electroslag furnace power is controlled, is characterized in that: the membership function that described fuzzy algorithmic approach adopts is the trigonometric function that susceptiveness is strong.
A kind of above-mentioned method that electroslag furnace power is controlled, is characterized in that: described fuzzy controller is single loop KMM controller able to programme.
A kind of above-mentioned method that electroslag furnace power is controlled, is characterized in that: described rectification circuit is single phase bridge type rectifier circu.
The present invention compared with prior art has the advantage that step is simple, it is convenient to realize, input cost is low, adopt Intelligent Fuzzy Control system, improve control accuracy and product quality, solve existing electroslag furnace control method unreasonable and be difficult to reach the practical problem that invariable power is smelted.
Below by drawings and Examples, technical scheme is described in further detail.
Accompanying drawing explanation
Fig. 1 is the flow chart of the present invention.
Detailed description of the invention
As it is shown in figure 1, the present invention comprises the following steps:
Step one, running parameter detects: adopt voltage transformer summation current transformer respectively the voltage and current being serially connected in the short net between magnetic voltage regulator and electrode in electroslag furnace to be detected in real time; Adopt LOAD CELLS that the weight of crystallizer for electroslag furnace is detected in real time; Adopt temperature sensor that the temperature in the bottom water tank of crystallizer for electroslag furnace is detected in real time;
Step 2, power measurements obtains: the voltage and current data detected are transferred to Type Active Power Converter by photoelectrical coupler by described voltage transformer summation current transformer, Type Active Power Converter obtains power data after described voltage and current data are carried out computing and converts described power data to corresponding standard current signal, described Type Active Power Converter is by the current signal transfer of output to I/V change-over circuit, and I/V change-over circuit converts described standard current signal to corresponding voltage signal and is transferred to fuzzy controller; Described voltage transformer summation current transformer all connects with photoelectrical coupler, and described photoelectrical coupler, Type Active Power Converter, I/V change-over circuit and fuzzy controller connect successively;
Step 3, fuzzy parameter tuning: given voltage data is transferred to fuzzy controller by master controller; First described given voltage and I/V change-over circuit are transmitted the virtual voltage come and calculate accordingly by fuzzy controller, draw voltage deviation signal E and deviation variation rate signal EC, then using fuzzy algorithmic approach that pid parameter is adjusted, its parameter tuning step is as follows:
Voltage deviation E and deviation variation rate EC excursion are defined as the domain in fuzzy set, and its fuzzy subset is E, EC={NB, NM, NS, ZO, PS, PM, PB}, element in this fuzzy subset represents negative big respectively, in negative, negative little, zero, just little, center, honest, by E and EC according to this fuzzy subset's obfuscation;
Set up fuzzy reasoning table, obtain proportionality coefficient variation delta Kp, integral coefficient variation delta Ki and differential coefficient variation delta Kd corresponding to different voltage deviation E and deviation variation rate EC;
E and EC and the value of above-mentioned �� Kp, �� Ki and �� Kd according to the previous cycle carry out adaptively correcting, draw current Proportional coefficient K p, integral coefficient Ki and differential coefficient Kd;
According to the discrete control algolithm of PID, calculate the output voltage centrifugal pump of fuzzy controller;
Step 4, electroslag furnace Power auto-adjustment: fuzzy controller is controlled shifting to triggering circuit according to described output voltage centrifugal pump, shift to triggering circuit output pulse voltage the angle of flow of bidirectional triode thyristor is controlled, the output average voltage of rectification circuit is adjusted by bidirectional triode thyristor, the melting voltage of electrode in electroslag furnace is adjusted by magnetic voltage regulator according to the output average voltage of described rectification circuit, thus reaching the power to electroslag furnace to carry out the purpose of constant control; Described fuzzy controller, shift to triggering circuit, bidirectional triode thyristor, magnetic voltage regulator and electrode in electroslag furnace connect successively;
Step 5, smelting process monitoring and operation troubles are reported to the police: described LOAD CELLS is by the weight data real-time Transmission of crystallizer for electroslag furnace that detects to master controller, and the burn-off rate of electrode is monitored by master controller according to described weight data; Described temperature sensor is by the temperature data real-time Transmission in the crystalliser feet water tank that detects to master controller, and described temperature is adjusted by master controller by temperature controller; When burn-off rate is too fast or temperature is too high, master controller drives Alarm Unit to send alarm signal; Described LOAD CELLS, temperature sensor and Alarm Unit all connect with master controller, and described temperature controller connects with temperature sensor and master controller respectively.
In the present embodiment, described master controller is industrial computer.
In the present embodiment, the membership function that described fuzzy algorithmic approach adopts is the trigonometric function that susceptiveness is strong.
In the present embodiment, described fuzzy controller is single loop KMM controller able to programme.
In the present embodiment, described rectification circuit is single phase bridge type rectifier circu.
The above; it it is only presently preferred embodiments of the present invention; not the present invention is imposed any restrictions, every any simple modification, change and equivalent structure change above example made according to the technology of the present invention essence, all still fall within the protection domain of technical solution of the present invention.
Claims (5)
1. the method that electroslag furnace power is controlled, it is characterised in that comprise the following steps:
Step one, running parameter detects: adopt voltage transformer summation current transformer respectively the voltage and current being serially connected in the short net between magnetic voltage regulator and electrode in electroslag furnace to be detected in real time; Adopt LOAD CELLS that the weight of crystallizer for electroslag furnace is detected in real time; Adopt temperature sensor that the temperature in the bottom water tank of crystallizer for electroslag furnace is detected in real time;
Step 2, power measurements obtains: the voltage and current data detected are transferred to Type Active Power Converter by photoelectrical coupler by described voltage transformer summation current transformer, Type Active Power Converter obtains power data after described voltage and current data are carried out computing and converts described power data to corresponding standard current signal, described Type Active Power Converter is by the current signal transfer of output to I/V change-over circuit, and I/V change-over circuit converts described standard current signal to corresponding voltage signal and is transferred to fuzzy controller; Described voltage transformer summation current transformer all connects with photoelectrical coupler, and described photoelectrical coupler, Type Active Power Converter, I/V change-over circuit and fuzzy controller connect successively;
Step 3, fuzzy parameter tuning: given voltage data is transferred to fuzzy controller by master controller; First described given voltage and I/V change-over circuit are transmitted the virtual voltage come and calculate accordingly by fuzzy controller, draw voltage deviation signal E and deviation variation rate signal EC, then using fuzzy algorithmic approach that pid parameter is adjusted, its parameter tuning step is as follows:
Voltage deviation E and deviation variation rate EC excursion are defined as the domain in fuzzy set, and its fuzzy subset is E, EC={NB, NM, NS, ZO, PS, PM, PB}, element in this fuzzy subset represents negative big respectively, in negative, negative little, zero, just little, center, honest, by E and EC according to this fuzzy subset's obfuscation;
Set up fuzzy reasoning table, obtain proportionality coefficient variation delta Kp, integral coefficient variation delta Ki and differential coefficient variation delta Kd corresponding to different voltage deviation E and deviation variation rate EC;
E and EC and the value of above-mentioned �� Kp, �� Ki and �� Kd according to the previous cycle carry out adaptively correcting, draw current Proportional coefficient K p, integral coefficient Ki and differential coefficient Kd;
According to the discrete control algolithm of PID, calculate the output voltage centrifugal pump of fuzzy controller;
Step 4, electroslag furnace Power auto-adjustment: fuzzy controller is controlled shifting to triggering circuit according to described output voltage centrifugal pump, shift to triggering circuit output pulse voltage the angle of flow of bidirectional triode thyristor is controlled, the output average voltage of rectification circuit is adjusted by bidirectional triode thyristor, the melting voltage of electrode in electroslag furnace is adjusted by magnetic voltage regulator according to the output average voltage of described rectification circuit, thus reaching the power to electroslag furnace to carry out the purpose of constant control; Described fuzzy controller, shift to triggering circuit, bidirectional triode thyristor, magnetic voltage regulator and electrode in electroslag furnace connect successively;
Step 5, smelting process monitoring and operation troubles are reported to the police: described LOAD CELLS is by the weight data real-time Transmission of crystallizer for electroslag furnace that detects to master controller, and the burn-off rate of electrode is monitored by master controller according to described weight data; Described temperature sensor is by the temperature data real-time Transmission in the crystalliser feet water tank that detects to master controller, and described temperature is adjusted by master controller by temperature controller; When burn-off rate is too fast or temperature is too high, master controller drives Alarm Unit to send alarm signal; Described LOAD CELLS, temperature sensor and Alarm Unit all connect with master controller, and described temperature controller connects with temperature sensor and master controller respectively.
2. a kind of method that electroslag furnace power is controlled described in claim 1, it is characterised in that: described master controller is industrial computer.
3. a kind of method that electroslag furnace power is controlled described in claim 1 or 2, it is characterised in that: the membership function that described fuzzy algorithmic approach adopts is the trigonometric function that susceptiveness is strong.
4. a kind of method that electroslag furnace power is controlled described in claim 1 or 2, it is characterised in that: described fuzzy controller is single loop KMM controller able to programme.
5. a kind of method that electroslag furnace power is controlled described in claim 1 or 2, it is characterised in that: described rectification circuit is single phase bridge type rectifier circu.
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| CN201410605557.8A CN105624417A (en) | 2014-10-31 | 2014-10-31 | Method for controlling electro-slag furnace power |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107058756A (en) * | 2017-04-19 | 2017-08-18 | 合智熔炼装备（上海）有限公司 | A kind of method that intelligent control is carried out to molten speed by impulse waveform |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107058756A (en) * | 2017-04-19 | 2017-08-18 | 合智熔炼装备（上海）有限公司 | A kind of method that intelligent control is carried out to molten speed by impulse waveform |
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Application publication date: 20160601 |