CN103618318A - Submerged arc furnace reactive power compensation system and method with static state and dynamic state combined - Google Patents
Submerged arc furnace reactive power compensation system and method with static state and dynamic state combined Download PDFInfo
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- CN103618318A CN103618318A CN201310591268.2A CN201310591268A CN103618318A CN 103618318 A CN103618318 A CN 103618318A CN 201310591268 A CN201310591268 A CN 201310591268A CN 103618318 A CN103618318 A CN 103618318A
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- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
Abstract
The invention provides a submerged arc furnace reactive power compensation system and method with the static state and the dynamic state combined. The reactive power compensation system comprises a PLC processor, a high-voltage current transformer, a high-voltage voltage transformer, a transformer, a power coefficient transmitter, a current transmitter, a voltage transmitter, an active power transmitter, static state compensation branch circuits and dynamic state compensation branch circuit. Each compensation branch circuit is formed by connecting a silicon-controlled switching switch and a compensation capacitor in series. The output end of the power coefficient transmitter, the output end of the current transmitter, the output end of the voltage transmitter and the output end of the active power transmitter are electrically connected with an input port of the PLC processor, an output port of the PLC processor is electrically connected with the input end of the silicon-controlled switching switch and feedback signals of the silicon-controlled switching switch are all output to the PLC processor. By means of the method, the compensation system can efficiently and accurately control switching of the compensation branch circuits and the purposes that the power coefficient is balanced, strong phase overcompensation or weak phase undercompensation is avoided and the utilization rate of active loads is improved are achieved.
Description
Technical field
The present invention relates to a kind of mineral hot furnace reactive compensation system, especially relate to a kind of mineral hot furnace static state and the reactive compensation system dynamically combining and method based on PLC controller.
Background technology
Mineral hot furnace is a kind of typical highly energy-consuming equipment, and in the electrical system of mineral hot furnace, smelting transformer and short net are all inductive loads, and it is in operation and need to consumes a large amount of reactive powers, causes power factor generally on the low side.In addition, in process of production, load variations is more frequent for mineral hot furnace, causes the variation of the various electric parameters such as power factor, active power also more frequent, and the short net length of every phase not etc., does not cause three phase reactive power itself uneven in addition.
Traditional metallurgical submerged-arc furnace reactive compensation system is mainly by vacuum contactor, fuse, the components and parts such as self healing capacitor form, low-voltage compensation is the fixed compensation mode of three-phase total compensation, although this traditional reactive compensation system can carry out reactive power compensation to the electrical system of mineral hot furnace, but, reactive power compensation amount can not change along with the variation of load, when device switching, because three-phase is idle, compensate simultaneously, cause by force and cross and mend mutually, a little less than owe mutually to mend, thereby it is large to cause switching process to be impacted, large to capacitor damage, switch contact easily burns, noise is large, switching time delay process is longer, slow in reacting, the problems such as defencive function is more single, particularly the electric parameter such as power factor can not effectively be controlled in the scope of technological parameter requirement.Therefore, traditional reactive compensation system is because three-phase reactive power compensation is uneven, caused three-phase electrode Voltage unbalance and three-phase activity coefficient uneven, can not meet the effective control of load variations to technological parameter in production process completely, directly cause the efficiency of mineral hot furnace low, power consumption is large, and its stability to the electrical system of mineral hot furnace is unsecured, also can cause power supply quality to worsen.
Summary of the invention
The technical problem to be solved in the present invention is: the problem existing for prior art, a kind of mineral hot furnace static state and the reactive compensation system dynamically combining and method are provided, avoid crossing mutually by force and mend or the weak benefit of owing mutually, to reach the object of balanced power factor and raising burden with power utilance.
The technical problem to be solved in the present invention realizes by the following technical solutions: a kind of mineral hot furnace static state and the reactive compensation system dynamically combining, comprise PLC processor, high-tension current inductor, high voltage potential transformer, transformer, power factor transmitter, current transducer, voltage transmitter and active power transmitter and compensation branch road, described compensation branch road comprises static compensation branch road and dynamic compensation branch road, and each compensation branch road is connected with compensation condenser by thyristor throw-cut switch; Described high-tension current inductor, high voltage potential transformer are electrically connected to the high pressure inlet wire of transformer input respectively, and its output current, voltage signal all output to PLC processor; The output of described transformer is electrically connected to power factor transmitter, current transducer, voltage transmitter, the input of active power transmitter and the electrode of mineral hot furnace respectively by short net; The output of described power factor transmitter, current transducer, voltage transmitter, active power transmitter is electrically connected to the input port of PLC processor respectively, the output port of described PLC processor is electrically connected to the input of thyristor throw-cut switch, and the feedback signal of thyristor throw-cut switch all outputs to PLC processor.
Preferably, described dynamic compensation branch road comprises two, and each compensation branch road is composed in series by thyristor throw-cut switch and compensation condenser.
Preferably, described compensation branch road also comprises the first reactor, and the first described reactor is connected between the compensation condenser and thyristor throw-cut switch in place compensation branch road.
Preferably, described reactive compensation system also comprises HMI equipment, and described PLC processor is electrically connected to HMI equipment by Ethernet.
Preferably, described thyristor throw-cut switch is connected in series successively by a fuse and self-healing capacitor, the second reactor and thyristor and another fuse, and two fuses are wherein electrically connected to the two poles of the earth of the short net of compensation respectively.
Above-mentioned a kind of mineral hot furnace static state and the compensation method of the reactive compensation system dynamically combining, wherein, it is input amount that described static compensation branch road mainly be take predefined static object power factor value, when input compensation branch road, first drop into static compensation branch road as basic compensation, after PLC processor judges that static compensation branch road drops into, PLC processor is according to the three-phase realtime power factor value of the short net of compensation monitoring, and take predefined power factor higher limit and power factor lower limit control input and the cut-out of dynamic compensation branch road as criterion.
Further, the allowed band that described static object power factor value is set is positive and negative 10%.
Further, described PLC processor compares the power factor value detecting in real time and predefined static object power factor value, when the current static power factor value detecting exceeded predefined static object power factor value 10% time, PLC processor is controlled thyristor throw-cut switch to exit partial dynamic compensation branch road; When the current static power factor value detecting be less than predefined static object power factor value-10% time, PLC processor is controlled thyristor throw-cut switch to drop into partial dynamic compensation branch road.
Further, described mineral hot furnace in process of production, during every input one road dynamic compensation, the power factor of system changes, when PLC processor judges that current power factor value is greater than predefined power factor higher limit, PLC processor is controlled thyristor throw-cut switch separating brake, and compensation branch road exits bucking-out system; When PLC processor judges that current power factor value is less than predefined power factor lower limit, PLC processor is controlled thyristor throw-cut switch and is closed a floodgate, and compensation branch road is input compensation system.
Compared with prior art, the invention has the beneficial effects as follows: this reactive compensation system and method are passed through PLC processor to all kinds of inputs, output signal focuses on and controls, because PLC processor is accurate for input, computation rate is high, processing speed is fast, thereby make the compensation control system can be efficient, the switching of control and compensation branch road exactly, to realize, the reactive power consumption in mineral hot furnace production process is carried out automatically, real-time tracking compensation, can effectively avoid common switching device to the voltge surge of short net and accurate compensation that can not be according to the load variations of mineral hot furnace and to the required reactive power compensation amount of system, related electric parameter is controlled in the scope of processing parameter setting effectively, with balanced power factor, avoided crossing mutually by force and mended or the weak benefit of owing mutually, burden with power utilance and mineral hot furnace service efficiency have been improved.
Accompanying drawing explanation
Fig. 1 is the static structural map with the reactive compensation system dynamically combining of a kind of mineral hot furnace of the present invention.
Fig. 2 is the circuit theory diagrams of thyristor throw-cut switch in Fig. 1.
Figure middle part product token name claims: 1-mineral hot furnace burner hearth, the clamping of 2-electrode and elevating mechanism, 3-electrode, 4-compensation condenser, 5-thyristor throw-cut switch, 6-transformer, 7-the first reactor, 8-fuse, 9-thyristor, 10-the second reactor, 11-self-healing capacitor.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with the drawings and specific embodiments, the present invention is described in detail.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
As shown in Figure 1, mineral hot furnace static state and the reactive compensation system dynamically combining, mainly comprise PLC processor, high-tension current inductor, high voltage potential transformer, transformer 6, power factor transmitter, current transducer, voltage transmitter and active power transmitter and compensation branch road.Compensation branch road is wherein to be composed in series by thyristor throw-cut switch 5 and compensation condenser 4.Described high-tension current inductor is electrically connected to the high pressure inlet wire of transformer 6 inputs, its output current signal outputs to the input port of PLC processor after ammeter, high voltage potential transformer is electrically connected to the high pressure inlet wire of transformer 6 inputs, and its output voltage signal outputs to the input port of PLC processor after voltmeter; The output of described transformer 6 is electrically connected to power factor transmitter, current transducer, voltage transmitter, the input of active power transmitter and the electrode of mineral hot furnace 3 respectively by short net, and electrode 3 is wherein clamped with elevating mechanism 2 and gripped or elevating movement with respect to mineral hot furnace burner hearth 1 by electrode; The output of described power factor transmitter, current transducer, voltage transmitter, active power transmitter is electrically connected to the input port of PLC processor respectively, the output port of the described PLC processor respectively input of Yu San road thyristor throw-cut switch 5 is electrically connected to, wherein every thyristor throw-cut switch 5 on the way respectively with a compensation condenser 4 compensation branch road that is electrically connected to form, meanwhile, the feedback signal of thyristor throw-cut switch 5 all outputs to PLC processor.The dynamic compensation group that this reactive compensation system is provided with a static compensation branch road and is comprised of two dynamic compensation branch roads, static compensation branch road is wherein as basic compensation, dynamic compensation branch road is as following the tracks of compensation, according to the load variations of mineral hot furnace, PLC processor be take three-phase activity coefficient and is controlled input or the cut-out of dynamic compensation branch road as controlled quentity controlled variable.Real-time policer operation for handled easily personnel, this PLC processor intercoms mutually by Ethernet and HMI equipment, this HMI equipment can adopt touch-screen, by touching on-screen-display message, operating personnel can real time inspection mineral hot furnace duty parameter, meanwhile, operating personnel can also send control command by touch-screen.
The switching major loop of above-mentioned thyristor throw-cut switch 5 as shown in Figure 2, the a utmost point that compensates short net is connected with fuse 8, this fuse 8 is connected in series successively with self-healing capacitor 11, the second reactor 10, thyristor 9 again, described thyristor 9 is connected with another one fuse 8 one end again, the other end of this another one fuse 8 is connected with the x utmost point of the short net of compensation, thereby has formed a switching major loop.The switching loop of this employing thuristor throw-in and throw-off mode, can effectively avoid common switching device to the voltge surge of short net and can not to the required reactive power compensation amount of system, accurately compensate according to the variation of load, thereby make whole system have switching without inrush phenomenon, without switching overvoltage, noncontacting switch, electric capacity long service life and the response time is short and capacitor on residual voltage do not affect advantages such as dropping into performance, the concrete response time wherein can regulate within the scope of 20ms～200s.In addition, because in process of production three times, five times of mineral hot furnace, seven inferior odd harmonics are heavier, this harmonic wave has compared with macrolesion the electric component in capacitor and system, in order to suppress harmonic wave, can be at compensation first reactor 7 of connecting in branch road, first reactor 7 of all connecting between the compensation condenser 4 of each compensation in branch road and thyristor throw-cut switch 5, with filtering appts harmonic wave.
Whole compensation branch road of the present invention comprises a static compensation branch road and the dynamic compensation group consisting of two dynamic compensation branch roads, it is input amount that static compensation branch road wherein mainly be take predefined static object power factor value, dynamic compensation branch road mainly using to A, B, C three-phase respectively predefined power factor higher limit and power factor lower limit as control criterion.In the mineral hot furnace course of work, the load variations of mineral hot furnace can cause the variation of power factor and the variation of reactive requirement amount.When A, B, C three-phase equilibrium, the burden with power of system is stable, without compensation branch road, compensates.But, when A, B, C three-phase can not reach balance, the electric parameter of system constantly changes, if static compensation can not meet Production requirement completely, now just need to drop into dynamic compensation branch road, dynamic compensation branch road compensates respectively A, B, C three-phase, the variation of real-time tracking load and the working of a furnace, power factor value is controlled in the power factor bandwidth range of setting all the time, avoids crossing mutually by force and mend or the weak benefit of owing mutually, to reach the object of balanced power factor and raising burden with power utilance.
When input compensation branch road, first drop into static compensation branch road as basic compensation, after PLC processor judges that static compensation branch road drops into, PLC processor is according to the load variations of mineral hot furnace, main take the A, the B that monitor, C three-phase realtime power factor value by controlled quentity controlled variable, take predefined power factor higher limit and power factor lower limit and control input and the cut-out of dynamic compensation branch road as criterion, PLC processor starts dynamic compensation branch road and compensates as following the tracks of.Dynamic compensation branch road is wherein provided with two, is conducive to increase the flexibility of whole bucking-out system.
The compensation method of the reactive compensation system in the present invention is specific as follows, when bucking-out system drops into, preset static compensation target power factor value, operated by rotary motion is to 0.88 left and right, and the allowed band of simultaneously setting this static compensation target power factor value is positive and negative 10%.After static compensation target power factor value is set, first system is as the criterion and drops into static compensation branch road with predefined static object power factor value, in process of production, the load variations of mineral hot furnace can cause the variation of power factor and the variation of reactive requirement amount, and PLC processor sends pulse signal according to the variation of power factor and triggers thyristor 9 combined floodgates in thyristor throw-cut switch 5.PLC processor compares the power factor value detecting in real time and predefined static compensation target power factor value, in the time of in the setting range of the current static power factor value detecting in predefined static compensation target power factor value positive and negative 10%, it is complete that PLC processor judges that static compensation branch road drops into; When the current static power factor value detecting exceeded predefined static compensation target power factor value 10% time, PLC processor send a triggering signal to exit partial dynamic compensation branch road will be automatically to thyristor throw-cut switch 5; When the current static power factor value detecting be less than predefined static compensation target power factor value-10% time, PLC processor send a triggering signal to drop into partial dynamic compensation branch road will be automatically to thyristor throw-cut switch 5.
In process of production, during every input one road dynamic compensation, the parameters such as the power factor of system and electric current, voltage all will change mineral hot furnace, these drop into after the variation Real-time Feedback of parameter to PLC processor and carry out logic decision.When current power factor value is greater than predefined power factor higher limit, PLC processor sends the pulse signal that exits compensation branch road, this exits compensation branch road pulse signal and triggers the thyristor 9 in thyristor throw-cut switch 5 and make its separating brake, after thyristor 9 separating brakes, compensation branch road exits bucking-out system; Otherwise, when current power factor value is less than predefined power factor lower limit, PLC processor sends the pulse signal of input compensation branch road, this input compensation branch road pulse signal triggers the thyristor 9 in thyristor throw-cut switch 5 and makes its combined floodgate, after thyristor 9 closes a floodgate, compensation branch road is input compensation system.Because the response time of thyristor 9 is short, can within the scope of 20ms～200s, regulate, therefore, no matter how the load of mineral hot furnace changes, bucking-out system is the variation of follow load and respective change automatically all, thereby power factor value is controlled in predefined power factor bandwidth all the time, avoids crossing mutually by force and mend or the weak benefit of owing mutually, reached the object of intelligent compensation reactive power.HMI equipment wherein adopts RS485 Ethernet and PLC processor to carry out real-time exchanges data and demonstration, a series of monitorings that PLC processor carries out are all reflected in the man-machine interface of HMI equipment in real time with control, therefore, operating personnel can carry out the Real-Time Monitoring of electric parameter effectively according to the shown real time information of HMI equipment to whole control system.
In sum, reactive compensation system of the present invention and method are controlled based on PLC processor, by various transmitters and instrument and meter etc., the monitoring variable in system and controlled quentity controlled variable are concentrated and gathered and input PLC processor, ammeter wherein can carry out primary current detection to the current signal of high-tension current inductor output, and voltmeter can carry out secondary voltage detection to the voltage signal of high voltage potential transformer output.PLC processor focuses on all kinds of inputs, output signal, and makes corresponding control according to manufacturing condition, more corresponding control information is transferred to HMI equipment by Ethernet.By man-machine interface, can see intuitively the various data messages that PLC processes, as data such as electric current, voltage, power factors; Meanwhile, operating personnel can also arrange higher limit and the lower limit that interface arranges the target power factor value of static compensation and the power factor of dynamic compensation by parameter in man-machine interface.After this value presets, PLC processor is controlled reactive power compensation amount from motion tracking by take the power factor value that sets as criterion.PLC processor is accurate for input, computation rate is high, processing speed is fast, thereby make the compensation control system switching of control and compensation branch road efficiently and accurately, to realize, the reactive power consumption in mineral hot furnace production process is carried out to automatic real-time track compensation, related electric parameter is controlled in the scope of processing parameter setting effectively with balanced power factor, avoided crossing mutually by force and mended or the weak benefit of owing mutually, improved burden with power utilance and mineral hot furnace service efficiency, be conducive to energy-conservation, consumption reduction and volume increase.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, it should be pointed out that all any modifications of doing within the spirit and principles in the present invention, be equal to replacement and improvement etc., within all should being included in protection scope of the present invention.
Claims (9)
- A mineral hot furnace static with the reactive compensation system dynamically combining, it is characterized in that: comprise PLC processor, high-tension current inductor, high voltage potential transformer, transformer (6), power factor transmitter, current transducer, voltage transmitter and active power transmitter and compensation branch road, described compensation branch road comprises static compensation branch road and dynamic compensation branch road, and each compensation branch road is connected with compensation condenser (4) by thyristor throw-cut switch (5); Described high-tension current inductor, high voltage potential transformer are electrically connected to the high pressure inlet wire of transformer (6) input respectively, and its output current, voltage signal all output to PLC processor; The output of described transformer (6) is electrically connected to power factor transmitter, current transducer, voltage transmitter, the input of active power transmitter and the electrode of mineral hot furnace (3) respectively by short net; The output of described power factor transmitter, current transducer, voltage transmitter, active power transmitter is electrically connected to the input port of PLC processor respectively, the output port of described PLC processor is electrically connected to the input of thyristor throw-cut switch (5), and the feedback signal of thyristor throw-cut switch (5) all outputs to PLC processor.
- 2. the static and reactive compensation system dynamically combining of a kind of mineral hot furnace according to claim 1, it is characterized in that: described dynamic compensation branch road comprises two, and each compensation branch road is composed in series by thyristor throw-cut switch (5) and compensation condenser (4).
- 3. according to a kind of mineral hot furnace static state and the reactive compensation system dynamically combining described in claim 1 or 2, it is characterized in that: described compensation branch road also comprises the first reactor (7), described the first reactor (7) is connected between the compensation condenser (4) and thyristor throw-cut switch (5) in place compensation branch road.
- 4. a kind of mineral hot furnace static state according to claim 3 and the reactive compensation system dynamically combining, it is characterized in that: described reactive compensation system also comprises HMI equipment, and described PLC processor is electrically connected to HMI equipment by Ethernet.
- 5. according to a kind of mineral hot furnace static state and the reactive compensation system dynamically combining described in claim 1 or 2, it is characterized in that: described thyristor throw-cut switch (5) is connected in series successively by a fuse (8) and self-healing capacitor (11), the second reactor (10) and thyristor (9) and another fuse (8), two fuses (8) are wherein electrically connected to the two poles of the earth of the short net of compensation respectively.
- 6. the static compensation method with the reactive compensation system dynamically combining of a kind of mineral hot furnace as claimed in claim 1, it is characterized in that: it is input amount that described static compensation branch road mainly be take predefined static object power factor value, when input compensation branch road, first drop into static compensation branch road as basic compensation, after PLC processor judges that static compensation branch road drops into, PLC processor is according to the three-phase realtime power factor value of the short net of compensation monitoring, and take predefined power factor higher limit and power factor lower limit control input and the cut-out of dynamic compensation branch road as criterion.
- 7. the static compensation method with the reactive compensation system dynamically combining of a kind of mineral hot furnace according to claim 6, is characterized in that: the allowed band of described static object power factor value setting is positive and negative 10%.
- 8. the static compensation method with the reactive compensation system dynamically combining of a kind of mineral hot furnace according to claim 7, it is characterized in that: described PLC processor compares the power factor value detecting in real time and predefined static object power factor value, when the current static power factor value detecting exceeded predefined static object power factor value 10% time, PLC processor is controlled thyristor throw-cut switch (5) to exit partial dynamic compensation branch road; When the current static power factor value detecting be less than predefined static object power factor value-10% time, PLC processor is controlled thyristor throw-cut switch (5) to drop into partial dynamic compensation branch road.
- 9. the static compensation method with the reactive compensation system dynamically combining of a kind of mineral hot furnace according to claim 6, it is characterized in that: described mineral hot furnace in process of production, during every input one road dynamic compensation, the power factor of system changes, when PLC processor judges that current power factor value is greater than predefined power factor higher limit, PLC processor is controlled thyristor throw-cut switch (5) separating brake, and compensation branch road exits bucking-out system; When PLC processor judges that current power factor value is less than predefined power factor lower limit, PLC processor is controlled thyristor throw-cut switch (5) and is closed a floodgate, and compensation branch road is input compensation system.
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| CN104201695A (en) * | 2014-09-15 | 2014-12-10 | 巨石集团有限公司 | Reactive compensation device and construction method thereof |
| CN104242309A (en) * | 2014-09-28 | 2014-12-24 | 张慧慧 | Adaptive adjustment device of smart grid |
| CN104852384A (en) * | 2015-02-10 | 2015-08-19 | 肇庆远境自动化设备有限公司 | Reactive dynamic filtering compensation control system |
| CN106300382A (en) * | 2016-08-30 | 2017-01-04 | 四川晨龙航天电器设备有限公司 | Control system for In The Sub-mergedfurnace of The Ferroalloys low-voltage compensation apparatus |
| CN106849102A (en) * | 2017-03-02 | 2017-06-13 | 安徽伊格瑞德电气设备有限公司 | A kind of mesohigh series compensation and depth current limiting system |
| CN107086583A (en) * | 2017-06-02 | 2017-08-22 | 北京英瑞来科技有限公司 | A kind of reactive power compensator and method that function is detected with fault electric arc |
| CN108599182A (en) * | 2018-04-13 | 2018-09-28 | 广西配网电力技术有限公司 | A kind of reactive power compensator and its compensating control method |
| CN110460064A (en) * | 2018-05-07 | 2019-11-15 | 成都市中朋达电气有限公司 | Mineral hot furnace intelligent powerless compensation system |
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| CN104201695A (en) * | 2014-09-15 | 2014-12-10 | 巨石集团有限公司 | Reactive compensation device and construction method thereof |
| CN104242309A (en) * | 2014-09-28 | 2014-12-24 | 张慧慧 | Adaptive adjustment device of smart grid |
| CN104852384A (en) * | 2015-02-10 | 2015-08-19 | 肇庆远境自动化设备有限公司 | Reactive dynamic filtering compensation control system |
| CN106300382A (en) * | 2016-08-30 | 2017-01-04 | 四川晨龙航天电器设备有限公司 | Control system for In The Sub-mergedfurnace of The Ferroalloys low-voltage compensation apparatus |
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| CN108599182A (en) * | 2018-04-13 | 2018-09-28 | 广西配网电力技术有限公司 | A kind of reactive power compensator and its compensating control method |
| CN110460064A (en) * | 2018-05-07 | 2019-11-15 | 成都市中朋达电气有限公司 | Mineral hot furnace intelligent powerless compensation system |
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Application publication date: 20140305 |