CN101800430B - High and low pressure combined reactive compensation control system for submerged arc furnace - Google Patents
High and low pressure combined reactive compensation control system for submerged arc furnace Download PDFInfo
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- CN101800430B CN101800430B CN2010101644900A CN201010164490A CN101800430B CN 101800430 B CN101800430 B CN 101800430B CN 2010101644900 A CN2010101644900 A CN 2010101644900A CN 201010164490 A CN201010164490 A CN 201010164490A CN 101800430 B CN101800430 B CN 101800430B
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- Y02E40/30—Reactive power compensation
Abstract
The invention relates to a submerged arc furnace control system, in particular to a high and low pressure combined reactive compensation control system for a submerged arc furnace, which comprises a primary side voltage mutual inductor, a primary side current mutual inductor, a secondary side voltage mutual inductor and a secondary side current mutual inductor which are used for acquiring data from a primary high pressure side and a secondary low pressure side of an submerged arc furnace transformer. The primary side voltage mutual inductor and a primary side current mutual inductor are respectively connected with an input port of an electric converter P1, and the secondary side voltage mutual inductor and the secondary side current mutual inductor are respectively connected with an input port of an electric converter P2; and a main control computer controls a programmable logic controller (PLC) to switch a compensating device, receive and send an alarm signal and receive and execute a temperature guard signal. The high and low pressure combined reactive compensation control system for the submerged arc furnace has the advantages of increasing the yield, improving the degree of automation and improving the human-computer interactive capacity.
Description
Technical field
The present invention relates to ore deposit hot furnace control system, particularly high and low pressure combined reactive compensation control system for submerged arc furnace.It can realize the cooperation of ore deposit hot stove high-low pressure reactive power compensator, the hot furnace operating state monitoring, alarming of switching cycle and ore deposit of the unequal compensation capacity of three-phase, is specially adapted to the reactive power compensator of capacity at the hot stove of 16500kVA and above ore deposit.
Background technology
The electrical system of the hot stove in ore deposit mainly is made up of high voltage supply network, furnace transformer, compensator, short net, water-cooling system, electrode system, burner hearth and control system; Its load characteristic between resistive and perceptual between; The short net of low-voltage and high-current and the structure and the work characteristics of water-cooling system; The natural power factor of the hot stove in decision ore deposit is difficult to reach more than 0.85; So just need carry out reactive power compensation to supply line, with power factor is brought up to national regulation 0.90 or more than, to reach the purpose of balance electric network reactive-load.
Present power supply department and ferroalloy enterprise more options high pressure compensation, this compensation way is to be parallel to capacitor on the three-phase bus of high pressure primary side, the advantage of single high pressure compensation is that equipment is simple, small investment.Shortcoming is because compensating action can only make access point circuit before; Electric power system electrical network one side is benefited; Satisfy the requirement of electric power system to this load circuit power factor aspect; To smelting enterprise,, can not increase the power output of transformer from comprising that the reactive power of contact tube until whole secondary side low-voltage and high-currents loop of brasses, electrode can not get compensation in ore heat furnace transformer winding, short net, water-cooled cable, the stove; Raising and power consumption, the ore deposit consumption of mine heat furnace smelting product yield are reduced, make the investment of enterprise can not produce the economic benefit of essence; The fixed compensation way of the many employings of present in addition high pressure compensation, compensation arrangement can not adapt to load variations in the stove production process, overcompensation or undercompensation phenomenon can occur.
To a large amount of reactive power consumptions and the disequilibrium of ore heat furnace transformer low pressure short-net side, take into account effective raising power factor and implement low-pressure reactive compensation.Its advantage is that low-voltage compensation moves forward to short net with compensation point; Shortened the reactive current path, a large amount of reactive power consumptions of the short net of local compensation are when effectively improving power factor; Reduced the loss of transformer with short net; Improve exerting oneself of transformer, increased and smelt effective input power, improved strong, the weak phase situation of three-phase electrode.But along with the hot heat size in ore deposit is increasing, the above hot stove in ore deposit of 30000kVA gets more and more, if only use single low-voltage compensation, it is excessive that secondary voltage is improved, and electrode current reduces, electric arc elongates, and lifts on the electrode, causes electrode to be difficult to insert down; After going into the effective input power increase of stove in addition, the smelting reduction sector width is increased, near the furnace wall, thermal loss increases, and the working of a furnace worsens, and high temperature erosion is damaged furnace lining, makes the decline of burner hearth life-span.
Summary of the invention
The object of the invention is exactly to design a kind ofly can in complex environment, accomplish appointed task and guarantee the high and low pressure combined reactive compensation control system for submerged arc furnace that overall system performance is optimum, improves power factor to reach, strengthens the effective output rating of ore heat furnace transformer, reduces the wastage, reduces tri-phase unbalance factor, increases output, improves automaticity and strengthens the high and low pressure combined reactive compensation control system for submerged arc furnace and the control method of human-computer interaction function.
For achieving the above object; Technical solution of the present invention is: high and low pressure combined reactive compensation control system for submerged arc furnace; Comprise the primary side voltage transformer, primary side current instrument transformer, secondary side voltage transformer, the secondary side current instrument transformer that carry out data acquisition from high-pressure side of ore heat furnace transformer and secondary low-voltage side; Primary side voltage transformer, primary side current instrument transformer connect the input port of P1 power transducer respectively; Secondary side voltage transformer, secondary side current instrument transformer connect the input port of P2 power transducer respectively; P1 power transducer and P2 power transducer are electrically connected with main control computer through interface, to main control computer high-pressure side of ore heat furnace transformer and secondary low-voltage side electric current, voltage data are provided; One Programmable Logic Controller PLC is electrically connected compensation arrangement C1 and C2, warning device AL1 and AL2 and temperature transmitter T simultaneously; One Programmable Logic Controller PLC is electrically connected with main control computer through interface simultaneously, and main control computer is accomplished the switching of compensation arrangement, the reception of alarm signal and the reception and the execution of transmission and temperature protection signal through control Programmable Logic Controller PLC.
Described main control computer comprises the steps: at least
The S101 step, after the user moved main program, initialization subroutine at first called in system;
The S102 step judges whether ore heat furnace transformer primary side voltage is normal;
The S103 step, normal, judge then whether the ore heat furnace transformer primary side current is normal; Otherwise change step S106;
Step S104, normal, judge then whether ore heat furnace transformer secondary side voltage is normal; Otherwise change step S106;
Step S105, normal, judge then whether short net of ore heat furnace transformer secondary side and capacitor temperature be normal, otherwise change step S106;
Step S108 judges whether automatic operation; Otherwise change step S106;
Step S109, high pressure switching subprogram is called in operation automatically;
Step S110 calls low pressure switching subprogram;
Finish.
Step S106, excision electric capacity is also reported to the police;
Step S107, whether warning resets or does not recover normal; Be to change step S108, do not change the S102 step;
Described main control computer comprises through the high pressure switching subroutine procedure that control Programmable Logic Controller PLC accomplishes compensation arrangement:
Step S201 after the entering switching subprogram, judges whether anxious stopping, and not, changes step S202; Suddenly stop, change step and finish;
Step S202 not, judges whether primary voltage is low, do not change step S206, is to change step S203;
Step S203 judges whether this low phase of primary voltage throws completely, is to change step and finish; Otherwise, change step S204;
Step S204 judges whether drop into time-delay arrives, not, changes step and finishes; Be to change step S205;
Step S205 drops into high-voltage capacitor in proper order, changes step S203;
Step S206 judges whether primary voltage is high, and height changes step S207, and is not high, changes step and finishes;
Step S207 judges whether high this of primary voltage has excised mutually to finish, and is, and change step and finish, not to change step S208;
Step S208 judges whether the excision time-delay arrives, is, changes step S209, not, changes step and finishes;
Step S209 excises high-voltage capacitor in proper order; Change step S207;
Step finishes.
Described main control computer comprises through the low pressure switching subroutine procedure that control Programmable Logic Controller PLC accomplishes compensation arrangement:
Step S301 after the entering low pressure switching subprogram, at first judges whether anxious stopping, and is, changes the end of subroutine of low pressure switching, not, changes step S302;
Step S302 judges whether power factor is low, low, changes step S303, not, changes step S306;
Step S303 judges whether this low phase of power factor throws completely, is, changes the end of subroutine of low pressure switching, is not to change step S304;
Step S304 judges whether drop into time-delay arrives, less than, change the end of subroutine of low pressure switching, arrive, change step S305;
Step S305 drops into secondary capacitor in proper order, changes step S303;
Step S306 judges whether power factor is high, is, changes step S307, is not, changes step S310;
Step S307 judges whether high this of power factor has excised mutually to finish, and is, changes the end of subroutine of low pressure switching, is not to change step S308;
Step S308 judges whether the excision time-delay arrives, is not, changes the end of subroutine of low pressure switching, is to change step S309;
Step S309 excises secondary capacitor in proper order, changes step S307;
Step S310 judges whether balance of active power, is, changes the end of subroutine of low pressure switching, is not to change step S311;
Step S311, judge active power minimum one whether thrown fullly mutually, be, change the end of subroutine of low pressure switching, be not to change step S312;
Step S312 judges whether drop into time-delay arrives, not, changes the end of subroutine of low pressure switching, is to change step S313;
Step S313 excises secondary capacitor in proper order, changes step S310;
The end of subroutine of low pressure switching.
Characteristics of the present invention and effect have:
1. adopt two intelligent electric power transmitter P1 and P2 to gather respectively in real time the electric parameter of ore heat furnace transformer primary side and the short net of secondary, make that information is comprehensive, parameter is complete, for main control computer PC implements accurately to control the hardware assurance is provided.
2. main control computer PC is powerful, be responsible for to accomplish tasks such as data processing is implemented with storage, algorithm, control output, adopts high-level programming language to realize the processing of multithreading task, for the walking abreast of each modular system, co-ordination provide the software assurance.
3. adopt the RS485 bus to connect each control module, data and information sharing when having guaranteed The whole control system work also make things convenient for approach for the new control module of interpolation provides.
4. control system is done host computer with main control computer PC; Programmable Logic Controller PLC does slave computer, and host computer PC is given an order to slave computer PLC, makes PLC carry out decentralized control; Through the monitoring of host computer, availablely realize the automatically-monitored of process of factory production easily to PLC.
5. display D provides the graphical interaction interface, and input equipment KM provides the interactive operation of operating personnel H and control system, includes the people in closed-loop control system simultaneously, the operating state and the treatment system abnormal conditions of be responsible for assigning control command, keeping watch on the hot stove in ore deposit.
Description of drawings
Below in conjunction with the embodiment accompanying drawing the present invention is further specified.
Fig. 1 is an ore deposit of the present invention hot stove high and low pressure combined reactive compensation system block diagram;
Fig. 2 is an ore deposit of the present invention hot stove high and low pressure combined reactive compensation system main program flow chart;
Fig. 3 is the high-pressure section switching subroutine flow chart of Fig. 2;
Fig. 4 is the low-pressure section switching subroutine flow chart of Fig. 2.
Embodiment
High and low pressure combined reactive compensation control system for submerged arc furnace is as shown in Figure 1; Comprise the primary side voltage transformer TV1, primary side current instrument transformer TA1, secondary side voltage transformer TV2, the secondary side current instrument transformer TA2 that carry out data acquisition from high-pressure side of ore heat furnace transformer and secondary low-voltage side; Primary side voltage transformer TV1, primary side current instrument transformer TA1 connect the input port of power transducer P1 respectively; Secondary side voltage transformer TV2, secondary side current instrument transformer TA2 connect the input port of power transducer P2 respectively; Power transducer P1 and power transducer P2 are electrically connected with main control computer through interface, to main control computer high-pressure side of ore heat furnace transformer and secondary low-voltage side electric current, voltage data are provided; One Programmable Logic Controller PLC is electrically connected compensation arrangement C1 and C2, warning device AL1 and AL2 and temperature transmitter T simultaneously; One Programmable Logic Controller PLC is electrically connected with main control computer through interface simultaneously, and main control computer is accomplished the switching of compensation arrangement, the reception of alarm signal and the reception and the execution of transmission and temperature protection signal through control Programmable Logic Controller PLC.
Control system also comprises main control computer PC, display D, input equipment KM (keyboard, mouse) except that power-supply system PS.
The concrete function and the connected mode of each several part are described below in conjunction with Fig. 1:
1) main control computer PC is the core that guarantees the control system performance, is responsible for tasks such as real-time detection, numerical computations, information processing, algorithm realization, process control.Simultaneously,, control the data acquisition of two intelligent electric power transmitter P1 and P2, handle control compensation device C1 and C2, and realize that the signal of warning device AL1 and AL2 sends and controlling alarm through Programmable Logic Controller PLC through the RS232 interface.
2) display D links to each other with main control computer PC, is the interactive interface of operating personnel H and control system, is responsible for parameter setting, data demonstration, compensation arrangement and work such as demonstration of power transducer operating state and the indication of switching capacity.
3) input equipment KM links to each other with main control computer PC, is the interactive means of operating personnel H and control system, is responsible for work such as parameter input, picture location, system operation and manual switching.
4) voltage transformer TV1 and TV2 link to each other with P2 with power transducer P1 respectively, are responsible for the detection of primary side and secondary side voltage signal, and output signal to power transducer P1 and P2.
5) current transformer TA1 and TA2 link to each other with P2 with power transducer P1 respectively, are responsible for the detection of primary side and secondary side current signal, and output signal to power transducer P1 and P2.
6) power transducer P1 and P2 are responsible for data acquisition, processing and the storage of voltage transformer TV1 and TV2, current transformer TA1 and TA2, and data are sent to main control computer PC through translation interface RS1 and RS2.
7) translation interface RS1 and RS2; Be responsible for the communication of power transducer P1 and P2 and Programmable Logic Controller PLC and main control computer PC respectively; Realize that single-ended RS-232 signal is to the RS-422 of balanced differential or the conversion of RS-485 signal; The isolation voltage of 2500V is provided, effectively suppresses surge, thunderbolt and disturb the reliable and stable of assurance communication altogether.
8) Programmable Logic Controller PLC connects and connects compensation arrangement C1 and C2, warning device AL1 and AL2 and temperature transmitter T respectively, is responsible for switching, the reception of alarm signal and the reception and the execution of transmission and temperature protection signal of control compensation device.
9) compensation arrangement C1 and C2, PLC is connected with Programmable Logic Controller, is the body of control system control, is responsible for the input and the excision of compensation arrangement, to improve power factor, to regulate tri-phase unbalance factor.
10) warning device AL1 is connected with Programmable Logic Controller PLC with AL2, and alarm signal sends when being responsible for the system failure.
11) temperature transmitter T is connected with Programmable Logic Controller PLC, is responsible for selection of temperature signal, judgement, and the temperature protection signal is offered Programmable Logic Controller PLC.
12) RS232 be connect translation interface RS1 and RS2 and with the physical channel of main control computer PC, guaranteed data and information sharing when control system is worked.
Suppose that compensation arrangement C1 and C2 carry out the switching operation task in the course of the work.
At first; Bucking-out system is moved down according to automated manner with device C1 and C2; Main control computer PC comprehensively from temperature transmitter T and the alarm signal of warning device AL1 and AL2 and electric signal and the information of power transducer P1 and P2 of Programmable Logic Controller PLC, carries out analyzing and processing and initialization operation.
Behind the initialization operation, according to task to be carried out, and current switching situation, main control computer PC carries out the enforcement of control algolithm.
In the control algolithm implementation process, for guaranteeing reliable, the stable and on-the-spot technology coupling of system.One of main feature of the present invention is the judgement that the software design of control system has realized five external conditions as shown in Figure 2; If primary voltage TV1, primary current TA1, secondary voltage TV2, secondary current TA2, internal temperature T have one undesired, system all can excise all electric capacity and send corresponding alarm signal.
After condition judgment was qualified, main control computer PC was according to the switching control algolithm, and the switching of advanced horizontal high voltage reactive power compensator is issued compensation arrangement C1 with controlled quentity controlled variable, and the corresponding capacitance of switching makes mine heat furnace smelting system primary voltage get a promotion; Calculate the capacitance of the required compensation of each phase electrode J then, through Programmable Logic Controller PLC, controlled quentity controlled variable is issued compensation arrangement C2 then, the corresponding capacitance of switching makes the mine heat furnace smelting system obtain the compensation of required reactive power.In the switching process; Power transducer P1 and P2 and Programmable Logic Controller PLC work in coordination; Position in real time with the tracking of parameter and detect, main control computer PC compares according to the data of returning and information and setup parameter, adopts advanced person's switching control algolithm assurance tracking accuracy; Correction error guarantees that compensation arrangement C1 and C2 are according to the parameter complete operation of setting in real time.If mine heat furnace smelting technology or condition change to some extent, operating personnel H will reset control variables and parameter and carry out initialization operation according to actual conditions.Whole process is carried out repeatedly, accomplishes final switching operation task up to bucking-out system.If abnormal conditions such as deadlocks, operating personnel H can assign to main control computer PC through input equipment KM and cease and desist order.
The concrete control method of high and low pressure combined reactive compensation control system for submerged arc furnace of the present invention also can be through following step explanation.
As shown in Figure 2, described main control computer comprises the steps: at least
The S101 step, after the user moved main program, initialization subroutine at first called in system;
The S102 step judges whether ore heat furnace transformer primary side voltage is normal;
The S103 step, normal, judge then whether the ore heat furnace transformer primary side current is normal; Otherwise change step S106;
Step S104, normal, judge then whether ore heat furnace transformer secondary side voltage is normal; Otherwise change step S106;
Step S105, normal, judge then whether short net of ore heat furnace transformer secondary side and capacitor temperature be normal, otherwise change step S106;
Step S108 judges whether automatic operation; Otherwise change step S106;
Step S109, high pressure switching subprogram is called in operation automatically;
Step S110 calls low pressure switching subprogram;
Finish.
Step S106, excision electric capacity is also reported to the police;
Step S107, whether warning resets or does not recover normal; Be to change step S108, do not change the S102 step;
As shown in Figure 3, main control computer comprises through the high pressure switching subroutine procedure that control Programmable Logic Controller PLC accomplishes compensation arrangement:
Step S201 after the entering switching subprogram, judges whether anxious stopping, and not, changes step S202; Suddenly stop, change step and finish;
Step S202 not, judges whether primary voltage is low, do not change step S206, is to change step S203;
Step S203 judges whether this low phase of primary voltage throws completely, is to change step and finish; Otherwise, change step S204;
Step S204 judges whether drop into time-delay arrives, not, changes step and finishes; Be to change step S205;
Step S205 drops into high-voltage capacitor in proper order, changes step S203;
Step S206 judges whether primary voltage is high, and height changes step S207, and is not high, changes step and finishes;
Step S207 judges whether high this of primary voltage has excised mutually to finish, and is, and change step and finish, not to change step S208;
Step S208 judges whether the excision time-delay arrives, is, changes step S209, not, changes step and finishes;
Step S209 excises high-voltage capacitor in proper order; Change step S207;
Step finishes.
As shown in Figure 3, main control computer comprises through the low pressure switching subroutine procedure that control Programmable Logic Controller PLC accomplishes compensation arrangement:
Step S301 after the entering low pressure switching subprogram, at first judges whether anxious stopping, and is, changes the end of subroutine of low pressure switching, not, changes step S302;
Step S302 judges whether power factor is low, low, changes step S303, not, changes step S306;
Step S303 judges whether this low phase of power factor throws completely, is, changes the end of subroutine of low pressure switching, is not to change step S304;
Step S304 judges whether drop into time-delay arrives, less than, change the end of subroutine of low pressure switching, arrive, change step S305;
Step S305 drops into secondary capacitor in proper order, changes step S303;
Step S306 judges whether power factor is high, is, changes step S307, is not, changes step S310;
Step S307 judges whether high this of power factor has excised mutually to finish, and is, changes the end of subroutine of low pressure switching, is not to change step S308;
Step S308 judges whether the excision time-delay arrives, is not, changes the end of subroutine of low pressure switching, is to change step S309;
Step S309 excises secondary capacitor in proper order, changes step S307;
Step S310 judges whether balance of active power, is, changes the end of subroutine of low pressure switching, is not to change step S311;
Step S311, judge active power minimum one whether thrown fullly mutually, be, change the end of subroutine of low pressure switching, be not to change step S312;
Step S312 judges whether drop into time-delay arrives, not, changes the end of subroutine of low pressure switching, is to change step S313;
Step S313 excises secondary capacitor in proper order, changes step S310;
The end of subroutine of low pressure switching.
Claims (9)
1. high and low pressure combined reactive compensation control system for submerged arc furnace; It is characterized in that: comprise the primary side voltage transformer TV1, primary side current instrument transformer TA1, secondary side voltage transformer TV2, the secondary side current instrument transformer TA2 that carry out data acquisition from high-pressure side of ore heat furnace transformer and secondary low-voltage side; Primary side voltage transformer TV1, primary side current instrument transformer TA1 connect the input port of power transducer P1 respectively; Secondary side voltage transformer TV2, secondary side current instrument transformer TA2 connect the input port of power transducer P2 respectively; Power transducer P1 and power transducer P2 are electrically connected with main control computer through interface, to main control computer high-pressure side of ore heat furnace transformer and secondary low-voltage side electric current, voltage data are provided; One Programmable Logic Controller PLC is electrically connected compensation arrangement C1, compensation arrangement C2, warning device AL1, warning device AL2 and temperature transmitter T simultaneously; This Programmable Logic Controller PLC is electrically connected with main control computer through interface simultaneously, and main control computer is accomplished the switching of compensation arrangement C1, compensation arrangement C2, the reception of alarm signal and the reception and the execution of transmission and temperature protection signal through control Programmable Logic Controller PLC; Described main control computer comprises through the high pressure switching step that control Programmable Logic Controller PLC accomplishes compensation arrangement C1:
Step S201 judges whether promptly to stop, and not, changes step S202; Be promptly to stop, change high pressure switching step and finish;
Step S202 judges whether primary voltage is low, do not change step S206, and being changes step S203;
Step S203 judges whether this low phase of primary voltage throws completely, is to change high pressure switching step and finish; Otherwise, change step S204;
Step S204 judges whether drop into time-delay arrives, not, changes high pressure switching step and finishes; Be to change step S205;
Step S205, the high-voltage capacitor among the input compensation device C1 changes step S203 successively;
Step S206 judges whether primary voltage is high, and height changes step S207, and is not high, changes high pressure switching step and finishes;
Step S207 judges whether high this of primary voltage has excised mutually to finish, and is, and change high pressure switching step and finish, not to change step S208;
Step S208 judges whether the excision time-delay arrives, is, changes step S209, not, changes high pressure switching step and finishes;
Step S209 excises the high-voltage capacitor among the compensation arrangement C1 successively; Change step S207;
High pressure switching step finishes.
2. high and low pressure combined reactive compensation control system for submerged arc furnace according to claim 1 is characterized in that: described interface is RS232 or RS-422 or RS-485.
3. high and low pressure combined reactive compensation control system for submerged arc furnace according to claim 1; It is characterized in that: described main control computer is through the data acquisition of RS232 control power transducer P1 and power transducer P2; Handle control compensation device C1 and compensation arrangement C2 through Programmable Logic Controller PLC, and realize that the signal of warning device AL1 and warning device AL2 sends and controlling alarm.
4. high and low pressure combined reactive compensation control system for submerged arc furnace according to claim 1; It is characterized in that: described power transducer P1 and power transducer P2 are responsible for data acquisition, processing and the storage of primary side voltage transformer TV1 and secondary side voltage transformer TV2, primary side current instrument transformer TA1 and secondary side current instrument transformer TA2, and data are sent to main control computer through translation interface.
5. high and low pressure combined reactive compensation control system for submerged arc furnace according to claim 1; It is characterized in that: described interface is responsible for the communication of power transducer P1 and power transducer P2 and Programmable Logic Controller PLC and main control computer respectively; Realize that single-ended RS-232 signal is to the RS-422 of balanced differential or the conversion of RS-485 signal; The isolation voltage of 2500V is provided, suppresses surge, thunderbolt and disturb altogether.
6. high and low pressure combined reactive compensation control system for submerged arc furnace according to claim 1 is characterized in that: described compensation arrangement C1 is connected with Programmable Logic Controller PLC with compensation arrangement C2, is used for being responsible for the input and the excision of building-out capacitor.
7. high and low pressure combined reactive compensation control system for submerged arc furnace according to claim 1; It is characterized in that: described temperature transmitter T is connected with Programmable Logic Controller PLC; Be responsible for selection of temperature signal, judgement, and the temperature protection signal is offered Programmable Logic Controller PLC.
8. high and low pressure combined reactive compensation control system for submerged arc furnace according to claim 1 is characterized in that: described main control computer comprises the steps: at least
Step S101, system at first call initialization step, get into step S102 afterwards;
Step S102 judges whether ore heat furnace transformer primary side voltage is normal, and is normal, then gets into step S103, otherwise changes step S106;
Step S103 judges whether the ore heat furnace transformer primary side current is normal; Normally, then get into step S104, otherwise change step S106;
Step S104 judges whether ore heat furnace transformer secondary side voltage is normal; Normally, then get into step S105, otherwise change step S106;
Step S105 judges whether short net of ore heat furnace transformer secondary side and capacitor temperature be normal, normal, then gets into step S108, otherwise changes step S106;
Step S106, excision electric capacity is also reported to the police, and gets into step S107 afterwards;
Step S107, whether judging reports to the police resets, and is then to change step S108, otherwise changes step S102;
Step S108 judges whether automatic operation, is then to get into step S109, finishes otherwise change step;
Step S109 calls high pressure switching step, gets into step S110 afterwards;
Step S110 calls low pressure switching step, gets into step afterwards and finishes;
Step finishes.
9. high and low pressure combined reactive compensation control system for submerged arc furnace according to claim 1 is characterized in that: described main control computer comprises through the low pressure switching step that control Programmable Logic Controller PLC accomplishes compensation arrangement:
Step S301 at first judges whether promptly to stop, and is, changes low pressure switching step and finishes, and not, changes step S302;
Step S302 judges whether power factor is low, low, changes step S303, not, changes step S306;
Step S303 judges whether low this of power factor is thrown fullly mutually, is, changes low pressure switching step and finishes, and is not to change step S304;
Step S304 judges whether drop into time-delay arrives, less than, change low pressure switching step and finish, arrive, change step S305;
Step S305, the secondary capacitor among the input compensation device C2 changes step S303 successively;
Step S306 judges whether power factor is high, is, changes step S307, is not, changes step S310;
Step S307 judges whether high this of power factor has excised mutually to finish, and is, and change low pressure switching step and finish, not to change step S308;
Step S308 judges whether the excision time-delay arrives, is not, changes low pressure switching step and finishes, and be to change step S309;
Step S309 excises the secondary capacitor among the compensation arrangement C2 successively, changes step S307;
Step S310 judges whether balance of active power, is, change low pressure switching step and finish, and or not to change step S311;
Step S311, judge active power minimum one whether thrown fullly mutually, be, change low pressure switching step and finish, be not to change step S312;
Step S312 judges whether drop into time-delay arrives, not, changes low pressure switching step and finishes, and be to change step S313;
Step S313 excises secondary capacitor successively, changes step S310;
Low pressure switching step finishes.
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| CN102692573A (en) * | 2012-05-28 | 2012-09-26 | 无锡北科自动化科技有限公司 | Submerged arc furnace transformer load monitoring and recording device |
| CN109357541A (en) * | 2018-10-17 | 2019-02-19 | 宁夏晟晏实业集团能源循环经济有限公司 | A kind of mineral hot furnace thermometric surveys pressure communication transfer device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1375903A (en) * | 2002-04-26 | 2002-10-23 | 白玉龙 | Secondary low-voltage compensator for electric furnace |
| CN201256298Y (en) * | 2008-08-08 | 2009-06-10 | 浙江工业职业技术学院 | Transforming plant voltage intelligent reactive dynamic compensation device based on field bus |
| CN101783515A (en) * | 2010-01-19 | 2010-07-21 | 西安科技大学 | Submerged arc furnace secondary reactive compensation control system and method |
-
2010
- 2010-05-06 CN CN2010101644900A patent/CN101800430B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1375903A (en) * | 2002-04-26 | 2002-10-23 | 白玉龙 | Secondary low-voltage compensator for electric furnace |
| CN201256298Y (en) * | 2008-08-08 | 2009-06-10 | 浙江工业职业技术学院 | Transforming plant voltage intelligent reactive dynamic compensation device based on field bus |
| CN101783515A (en) * | 2010-01-19 | 2010-07-21 | 西安科技大学 | Submerged arc furnace secondary reactive compensation control system and method |
Non-Patent Citations (2)
| Title |
|---|
| 张传伟 等.锰硅电炉低压补偿控制系统研究.《铁合金》.2008,(第200期),第37-39页. * |
| 黄薇.铁合金矿热电炉电气系统设计.《有色冶金设计与研究》.2008,第29卷(第5期),第15-18页. * |
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| Publication number | Publication date |
|---|---|
| CN101800430A (en) | 2010-08-11 |
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