CN103066895A - Anti-explosion soft-starting synchronous seamless switching technology for mines - Google Patents
Anti-explosion soft-starting synchronous seamless switching technology for mines Download PDFInfo
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- CN103066895A CN103066895A CN2012105838374A CN201210583837A CN103066895A CN 103066895 A CN103066895 A CN 103066895A CN 2012105838374 A CN2012105838374 A CN 2012105838374A CN 201210583837 A CN201210583837 A CN 201210583837A CN 103066895 A CN103066895 A CN 103066895A
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Abstract
Provided is an anti-explosion soft-starting synchronous seamless switching technology for mines. One side of soft-starting equipment accesses to a power grid and is controlled by a contactor. An output end of a frequency converter is connected with the soft-starting equipment through a frequency converting contactor. A synchronization unit detects phases and frequencies of the power grid and the frequency converter and outputs analog signals to the frequency converter. The frequency converter adjusts the phases and frequencies. When the phases and the frequencies output by the frequency converter are equal to the phases and the frequencies of the power grid, the synchronization unit outputs synchronization pulses to the frequency converter. After receiving the synchronization pulses, the frequency converter stops outputting and is disconnected with the frequency converting contactor. A power grid contactor is closed, and switching from a soft-starting to the power grid is completed. Due to the fact that the synchronization technology and the existing frequency converter are used in a matched mode, a high-power electro motor can be started in a weaker power grid, a high torque is generated, and a straight-up large current without power frequency is generated. When the output of the frequency converter is synchronous with the power grid, the frequency converter is closed, the power grid is accessed, and frequency converter resources are not limited. The synchronization technology achieves seamless switching and has no mechanical shock to mechanical equipment.
Description
Technical field
The present invention relates to a kind of soft Starting Technology of mining soft start equipment, specifically, is the synchronous seamless switching technique of a kind of soft start.
Background technology
Soft Starting Technology is used in coal mine equipment a lot, such as belt feeder for level and smooth startup, to reduce the wearing and tearing of belt.Pumping plant switches to power frequency in order to regulate pressure by speed governing.Present soft start equipment and power frequency are switched because there not being the judgement of phase sequence, all are to cut away first soft start equipment, drop into power frequency supply to load again, and there is the intermittently situation of outage in load equipment.For powerful device, if switch untimely, the danger of still exist impacting.According to present circumstances, studied the synchronous seamless switching technique of a kind of soft start.
Summary of the invention
The object of the invention is to share with mine-used frequency-converter, for the load that requires soft start, only take the extremely limited resource of frequency converter, the seamless switching technique of incision electrical network after starting at full speed.
Technical scheme of the present invention is: the synchronous seamless switching technique of a kind of mine anti-explosion soft start, the equipment of soft start is controlled with contactor in a side of access electrical network, the output of frequency converter is received soft start equipment through the frequency conversion contactor, phase place and the frequency of lock unit detection of grid and frequency converter output, and outputting analog signal is to frequency converter, frequency converter is adjusted phase place and frequency, when the frequency converter output phase is identical with frequency with frequency and electrical network phase place, lock unit output lock-out pulse is to frequency converter, after frequency converter receives lock-out pulse, stop output and disconnect the frequency conversion contactor, the electrical network contactor is closed, finishes soft start to the switching of electrical network.
Preferably: described lock unit comprises Signal Pretreatment unit, sampling unit, waveform analysis unit, simulation output and pulse output; The voltage signal attenuation filter of Signal Pretreatment unit to measuring, sampling unit is analog to digital conversion circuit, signal after will sampling in the waveform analysis unit is processed and is calculated, whether judge synchronously, degree according to phase place and difference on the frequency, the analog quantity that output is corresponding, after judgement synchronously, the output synchronous control signal.
Preferably: between described electrical network and the lock unit, be provided with three-phase voltage measuring transformer T1, T2 between frequency converter output and the lock unit.
Beneficial effect of the present invention is: simultaneous techniques and existing frequency converter are used, and can start heavy-duty motor in than the light current net, produce simultaneously large torque, the large electric current that does not have power frequency directly to rise.When frequency converter output of the present invention and synchronized, disconnect frequency conversion access electrical network, the frequency converter resource is unrestricted.This simultaneous techniques has realized seamless switching, to plant equipment without any mechanical shock.Greatly reduce the loss of plant equipment, prolonged useful life.Especially the pumping plant under coal mine, an available frequency converter and a lock unit are controlled one by one many pumps and are put into operation, have both economized equipment, realize again the basic goal of soft start.
Fig. 1 is theory diagram of the present invention
Fig. 2 is the theory diagram of lock unit of the present invention
Fig. 3 is the schematic diagram of the specific embodiment of the invention
Below in conjunction with description of drawings the specific embodiment of the present invention:
The synchronous seamless switching technique of a kind of mine anti-explosion soft start, the equipment of soft start is controlled with contactor in a side of access electrical network, the output of frequency converter is received soft start equipment through the frequency conversion contactor, phase place and the frequency of lock unit detection of grid and frequency converter output, and outputting analog signal is to frequency converter, frequency converter is adjusted phase place and frequency, when the frequency converter output phase is identical with frequency with frequency and electrical network phase place, lock unit output lock-out pulse is to frequency converter, after frequency converter receives lock-out pulse, stop output and disconnect the frequency conversion contactor, the electrical network contactor is closed, finishes soft start to the switching of electrical network.Described lock unit comprises Signal Pretreatment unit, sampling unit, waveform analysis unit, simulation output and pulse output; The voltage signal attenuation filter of Signal Pretreatment unit to measuring, sampling unit is analog to digital conversion circuit, signal after will sampling in the waveform analysis unit is processed and is calculated, whether judge synchronously, degree according to phase place and difference on the frequency, the analog quantity that output is corresponding, after judgement synchronously, the output synchronous control signal.Between described electrical network and the lock unit, be provided with three-phase voltage measuring transformer T1, T2 between frequency converter output and the lock unit.。
The lock unit theory of constitution as shown in Figure 2, by the Signal Pretreatment unit, sampling unit, the waveform analysis unit, simulation output, the control output forms.Wherein the Signal Pretreatment unit is to the voltage signal attenuation filter of measurement, sampling unit is exactly analog to digital conversion circuit, waveform analysis partly is core, adopt the high-speed figure chip, signal after the sampling is processed calculating, judgement synchronously whether, according to the degree of phase place and difference on the frequency, the analog quantity that output is corresponding.After judgement synchronously, the output synchronizing signal.Generally speaking, two voltage signals of lock unit monitoring, one is electric power incoming line, one is frequency conversion output.Pilot signal is phase place and frequency.The output BUFOUT of lock unit is the analog signal of 0 ~ 10V, when less than 5V, illustrates that mains frequency is higher than frequency converter frequency, when greater than 5V, illustrates that mains frequency is lower than frequency converter frequency.Frequency converter can use debugging functions constantly to adjust output frequency to power frequency 50Hz on the basis of BUFOUT signal.When BUFOUT reaches 5V, illustrate that synchronous condition reaches, i.e. frequency converter output and electric network source phase matched, frequency is consistent.In addition, also export a single pulse signal SYNC synchronously the time.
Among Fig. 3, the major loop of system and control loop are started by frequency converter during soft starter for motor, and when namely upper control was electric, contactor K1 was closed, and K2 and K6 disconnect, and begin to accelerate.Two three-phase voltage measuring transformer T1 among the figure, T2 are respectively applied to the high pressure of electrical network and frequency conversion output is converted to low pressure, and two low-voltage signals are sent into lock unit.BUFOUT by lock unit outputs on the input AI1 of frequency conversion, automatically revise and constantly adjust frequency conversion output, when the frequency of frequency converter output is identical with phase place and electrical network, lock unit output SYNC single pulse signal makes relay K 3 actions, the then K3 actuating of relay and self-sustaining, then contactor K2 adhesive and self-sustaining, contactor K1 dead electricity in the K3 action disconnects the output to motor of frequency converter, has finished smoothly by the switching of frequency converter to common frequency power network.Other relay K 5 and contactor K6 are applicable to the occasion of tape input reactor.This system finishes the soft start seamless switching of motor.
Above illustrated embodiment is only with for conveniently illustrating the present invention, and at technical scheme category of the present invention, the person of ordinary skill in the field does various simple deformation and modification, all should be included in the above claim.
Claims (3)
1. synchronous seamless switching technique of mine anti-explosion soft start, it is characterized in that: the equipment of soft start is controlled with contactor in a side of access electrical network, the output of frequency converter is received soft start equipment through the frequency conversion contactor, phase place and the frequency of lock unit detection of grid and frequency converter output, and outputting analog signal control frequency converter, frequency converter is adjusted phase place and frequency, when the frequency converter output phase is identical with frequency with frequency and electrical network phase place, lock unit output lock-out pulse is to frequency converter, after frequency converter receives lock-out pulse, stop output and disconnect the frequency conversion contactor, the electrical network contactor is closed, finishes soft start to the switching of electrical network.
2. the synchronous seamless switching technique of mine anti-explosion soft start as claimed in claim 1 is characterized in that: described lock unit comprises Signal Pretreatment unit, sampling unit, waveform analysis unit, simulation output and pulse output; The voltage signal attenuation filter of Signal Pretreatment unit to measuring, sampling unit is analog to digital conversion circuit, signal after will sampling in the waveform analysis unit is processed and is calculated, whether judge synchronously, degree according to phase place and difference on the frequency, the analog quantity that output is corresponding, after judgement synchronously, the output synchronous control signal.
3. the synchronous seamless switching technique of mine anti-explosion soft start as claimed in claim 1 is characterized in that: between described electrical network and the lock unit, be provided with three-phase voltage measuring transformer T1, T2 between frequency converter output and the lock unit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012105838374A CN103066895A (en) | 2012-12-30 | 2012-12-30 | Anti-explosion soft-starting synchronous seamless switching technology for mines |
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| CN2012105838374A CN103066895A (en) | 2012-12-30 | 2012-12-30 | Anti-explosion soft-starting synchronous seamless switching technology for mines |
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| CN2012105838374A Pending CN103066895A (en) | 2012-12-30 | 2012-12-30 | Anti-explosion soft-starting synchronous seamless switching technology for mines |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104579101A (en) * | 2014-12-02 | 2015-04-29 | 苏州汇川技术有限公司 | Control system and control method for switching variable frequency into power frequency by high-voltage frequency converter |
| CN104753438A (en) * | 2015-03-20 | 2015-07-01 | 苏寿喜 | Variable frequency tracking and switching method |
| CN107666260A (en) * | 2016-07-27 | 2018-02-06 | 发那科株式会社 | Control device of electric motor, method of motor control and computer-readable medium |
| CN110677096A (en) * | 2018-07-02 | 2020-01-10 | 西门子股份公司 | Drive control device, frequency converter and drive control method |
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| JPS55136883A (en) * | 1979-04-13 | 1980-10-25 | Hitachi Ltd | Synchronization-switching circuit of current-type inverter |
| CN101924508A (en) * | 2010-08-20 | 2010-12-22 | 上海交通大学 | Variable-frequency speed regulating system for starting high-power pumped storage unit |
| CN202190233U (en) * | 2011-08-29 | 2012-04-11 | 江苏聚友电气有限公司 | Isolated type explosion-proof high voltage soft start controller |
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2012
- 2012-12-30 CN CN2012105838374A patent/CN103066895A/en active Pending
Patent Citations (3)
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| JPS55136883A (en) * | 1979-04-13 | 1980-10-25 | Hitachi Ltd | Synchronization-switching circuit of current-type inverter |
| CN101924508A (en) * | 2010-08-20 | 2010-12-22 | 上海交通大学 | Variable-frequency speed regulating system for starting high-power pumped storage unit |
| CN202190233U (en) * | 2011-08-29 | 2012-04-11 | 江苏聚友电气有限公司 | Isolated type explosion-proof high voltage soft start controller |
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| 丁学文等: "交流电机变频软起动时的问题及解决方法", 《电力电子技术》 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104579101A (en) * | 2014-12-02 | 2015-04-29 | 苏州汇川技术有限公司 | Control system and control method for switching variable frequency into power frequency by high-voltage frequency converter |
| CN104579101B (en) * | 2014-12-02 | 2017-10-13 | 苏州汇川技术有限公司 | High voltage converter frequency conversion switches to the control system and control method of power frequency |
| CN104753438A (en) * | 2015-03-20 | 2015-07-01 | 苏寿喜 | Variable frequency tracking and switching method |
| CN104753438B (en) * | 2015-03-20 | 2017-06-13 | 苏寿喜 | A kind of conversion frequencies tracking and changing method |
| CN107666260A (en) * | 2016-07-27 | 2018-02-06 | 发那科株式会社 | Control device of electric motor, method of motor control and computer-readable medium |
| CN107666260B (en) * | 2016-07-27 | 2019-05-14 | 发那科株式会社 | Control device of electric motor, method of motor control and computer-readable medium |
| CN110677096A (en) * | 2018-07-02 | 2020-01-10 | 西门子股份公司 | Drive control device, frequency converter and drive control method |
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