CN102946136A - Circuit and method for switching from power frequency of high-voltage inverter to variable frequency without disturbance - Google Patents
Circuit and method for switching from power frequency of high-voltage inverter to variable frequency without disturbance Download PDFInfo
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- CN102946136A CN102946136A CN2012104082548A CN201210408254A CN102946136A CN 102946136 A CN102946136 A CN 102946136A CN 2012104082548 A CN2012104082548 A CN 2012104082548A CN 201210408254 A CN201210408254 A CN 201210408254A CN 102946136 A CN102946136 A CN 102946136A
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- 238000005516 engineering processes Methods 0.000 description 2
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
Abstract
The invention discloses a circuit and a method for switching from power frequency of a high-voltage inverter to variable frequency without disturbance. The circuit comprises the high-voltage inverter, wherein an input end of the high-voltage inverter is connected with a power grid through a wire inlet switch QF1; an output end of the high-voltage inverter is connected to a load motor sequentially through a three-phase reactor L and a wire outlet switch QF2; an input end of the load motor is connected with the power grid sequentially through a power frequency bypass switch QF3 and a current sampling CT; and the current sampling CT is connected with the high-voltage inverter and is used for collecting the current during power-frequency operation and controlling the power-frequency current to be zero during switching. By the circuit and the method for switching from power frequency of the high-voltage inverter to variable frequency without disturbance, undisturbed switching from power frequency of the high-voltage inverter to variable frequency can be guaranteed, the production continuity is guaranteed, impact to the high-voltage inverter in the switching process is avoided, and meanwhile, failure of the high-voltage inverter in the switching process is avoided.
Description
Technical field
The present invention relates to the control field that the frequency conversion of high voltage converter power frequency is switched, in particular, relate to the method that a kind of high voltage converter power frequency is switched to the frequency conversion unperturbed.
Background technology
Along with the power-saving technology extensive use of high voltage converter in occasions that counts for much such as electric power, metallurgy, oil, chemical industry, stability and the energy-saving effect of high voltage converter are had higher requirement.Because high voltage converter loading in the whole production process in the industry-by-industry that uses all is a very crucial link; do not allow to occur shutting down, the high voltage converter power frequency just has great importance to continuity and the fail safe that the frequency conversion unperturbed switches for subscriber equipment and production.
At present traditional power frequency mainly contains following several to the frequency conversion switching:
1) power frequency is shut down, high voltage converter translator variable frequency starting;
2) frequency, amplitude and the phase place of high voltage converter output voltage and power-frequency voltage consistent after, close outlet switch, minute by-pass switch;
More than first can not guarantee the continuity of producing in two kinds of methods; Though second method can realize power frequency to the switching of frequency conversion, but have great potential safety hazard, when namely moving near motor is fully loaded, load switches to frequency conversion by power frequency, may trigger high-pressure frequency-conversion and think highly of fault, causes frequency converter to shut down, so that handoff failure.The high voltage converter power frequency can avoid power frequency to occur to frequency conversion handoff procedure medium-high voltage frequency converter machine halt trouble to the method that the frequency conversion unperturbed switches effectively.
Summary of the invention
The object of the invention is to solve the problem that power frequency is switched to the frequency conversion unperturbed; the unperturbed changing method of a kind of high voltage converter power frequency to frequency conversion is provided; undisturbed when this changing method can realize that high voltage converter switches to converting operation by power frequency; avoid power frequency to occur to frequency conversion handoff procedure medium-high voltage frequency converter machine halt trouble; guarantee the continuity of production; avoid simultaneously in the handoff procedure impact of high voltage converter has been promoted the reliability of whole system, thereby guaranteed user's maximizing the benefits.
For achieving the above object, the present invention by the following technical solutions, during the stable operation of high voltage converter power frequency, obtain switching command after, the be incorporated into the power networks meritorious and reactive power of rear control output of high voltage converter outlet, making power frequency by-pass switch side electric current is zero.
A kind of high voltage converter power frequency is to the unperturbed commutation circuit of frequency conversion, comprise high voltage converter, it is characterized in that: the input of high voltage converter is connected with electrical network by service entrance switch QF1, the high voltage converter output is connected to load motor by a three-phase reactor L, outlet switch QF2 successively, the load motor input is connected with electrical network by power frequency by-pass switch QF3, current sample CT successively, current sample CT is connected the electric current when gathering power frequency operation with high voltage converter, power current is zero when switching in order to control.
A kind of high voltage converter power frequency may further comprise the steps to the unperturbed changing method of frequency conversion:
When 1) power frequency was stablized, high voltage converter closed service entrance switch, and gathered grid side voltage, carried out phase-locked;
2) high voltage frequency transformer main control system control output voltage makes frequency, phase place and the amplitude of itself and line voltage in full accord;
3) outlet switch is closed in high voltage frequency transformer main control system control, and high voltage frequency transformer main control system gathers bypass side power current simultaneously, calculates amplitude and the phase place of this electric current; Control system calculates active power and the reactive power of bypass side again in conjunction with amplitude and the phase information of input voltage;
4) high voltage frequency transformer main control system sends corresponding meritorious and idle order according to active power and the reactive power of calculating gained, and the control high voltage converter is meritorious and reactive power to the electrical network input, until bypass side electric current is zero;
5) at this moment, high voltage converter is to power input to machine and electrical network is not exported any power to motor; High voltage frequency transformer main control system control by-pass switch separating brake, whole system enters the converting operation state.
Aforesaid a kind of high voltage converter power frequency is characterized in that to frequency conversion unperturbed changing method: described service entrance switch, outlet switch and by-pass switch are vacuum circuit-breaker or contactor.
The invention has the beneficial effects as follows: undisturbed when the realization high voltage converter switches to converting operation by power frequency; avoid power frequency to occur to frequency conversion handoff procedure medium-high voltage frequency converter machine halt trouble; guarantee the continuity of production; avoid simultaneously in the handoff procedure impact to high voltage converter; promote the reliability of whole system, thereby guaranteed user's maximizing the benefits.
Description of drawings
Fig. 1 is that high voltage converter power frequency of the present invention is to the circuit structure diagram of frequency conversion unperturbed changing method;
Fig. 2 is the one embodiment of the invention flow chart.
Embodiment
The invention will be further described below in conjunction with accompanying drawing and embodiment:
As shown in Figure 1, structure chart for high voltage converter configuration auto by pass switch, the input of high voltage converter is connected with electrical network by service entrance switch QF1, high voltage converter output is connected with outlet switch QF2 by a three-phase reactor L first, be connected to load motor, load motor is connected with electrical network by power frequency by-pass switch QF3 simultaneously, increases current sample CT in by-pass switch QF3 upper end, electric current when gathering power frequency operation, power current is zero when switching in order to control.During the high voltage converter converting operation, service entrance switch QF1, outlet switch QF2 are closed, and power frequency by-pass switch QF3 disconnects, and is powered to load motor by high voltage converter.During the high voltage converter power frequency operation, service entrance switch QF1, outlet switch QF2 disconnect, and power frequency by-pass switch QF3 is closed, is powered to load motor by electrical network.When the high voltage converter power frequency operation, when detecting switching command, high voltage converter closes service entrance switch QF1, gathers simultaneously the line voltage horizontal lock of going forward side by side, and high voltage frequency transformer main control system control output voltage and mains frequency, phase place and amplitude are in full accord.Outlet switch QF2 is closed in high voltage converter control, and calculates bypass side power, according to the power of bypass side, the corresponding power of PWM Generator High Voltage Inverter Control System control output, so that bypass side electric current is zero, disjunction this moment power frequency switch QF3 realizes that power frequency is to the undisturbed switching of frequency conversion.The implementation flow process as shown in Figure 2, step is as follows:
When 1) power frequency was stablized, high voltage converter closed service entrance switch, and gathered grid side voltage, carried out phase-locked;
2) high voltage frequency transformer main control system control output voltage makes frequency, phase place and the amplitude of itself and line voltage in full accord;
3) outlet switch is closed in high voltage frequency transformer main control system control, and high voltage frequency transformer main control system gathers bypass side power current simultaneously, calculates amplitude and the phase place of this electric current; Control system calculates active power and the reactive power of bypass side again in conjunction with amplitude and the phase information of input voltage;
4) high voltage frequency transformer main control system sends corresponding meritorious and idle order according to active power and the reactive power of calculating gained, and the control high voltage converter is meritorious and reactive power to the electrical network input, until bypass side electric current is zero;
5) at this moment, high voltage converter is to power input to machine and electrical network is not exported any power to motor; High voltage frequency transformer main control system control by-pass switch separating brake, whole system enters the converting operation state.
In sum; take high voltage converter power frequency of the present invention to frequency conversion unperturbed changing method; can avoid power frequency to occur to frequency conversion handoff procedure medium-high voltage frequency converter machine halt trouble; guarantee the continuity of production; avoid simultaneously in the handoff procedure impact to high voltage converter; promote the reliability of whole system, thereby guaranteed user's maximizing the benefits.
Above embodiment only is used for explanation the present invention, does not limit protection scope of the present invention with this.The equivalent transformation that those skilled in the art do based on technical solution of the present invention all belongs within the protection range of the present invention.
Claims (3)
1. a high voltage converter power frequency is to the unperturbed commutation circuit of frequency conversion, comprise high voltage converter, it is characterized in that: the input of high voltage converter is connected with electrical network by service entrance switch QF1, the high voltage converter output is connected to load motor by a three-phase reactor L, outlet switch QF2 successively, the load motor input is connected with electrical network by power frequency by-pass switch QF3, current sample CT successively, current sample CT is connected with high voltage converter, and power current was zero when the electric current when being used for gathering power frequency operation and control were switched.
2. a high voltage converter power frequency is characterized in that to frequency conversion unperturbed changing method, may further comprise the steps:
When 1) power frequency was stablized, high voltage converter closed service entrance switch, and gathered grid side voltage, carried out phase-locked;
2) high voltage frequency transformer main control system control output voltage makes frequency, phase place and the amplitude of itself and line voltage in full accord;
3) outlet switch is closed in high voltage frequency transformer main control system control, and high voltage frequency transformer main control system gathers bypass side power current simultaneously, calculates amplitude and the phase place of this electric current; Control system calculates active power and the reactive power of bypass side again in conjunction with amplitude and the phase information of input voltage;
4) high voltage frequency transformer main control system sends corresponding meritorious and idle order according to active power and the reactive power of calculating gained, and the control high voltage converter is meritorious and reactive power to the electrical network input, until bypass side electric current is zero;
5) at this moment, high voltage converter is to power input to machine and electrical network is not exported any power to motor; High voltage frequency transformer main control system control by-pass switch separating brake, whole system enters the converting operation state.
3. a kind of high voltage converter power frequency according to claim 2 is characterized in that to frequency conversion unperturbed changing method: described service entrance switch, outlet switch and by-pass switch are vacuum circuit-breaker or contactor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201210408254.8A CN102946136B (en) | 2012-10-24 | 2012-10-24 | Circuit and method for switching from power frequency of high-voltage inverter to variable frequency without disturbance |
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| CN201210408254.8A CN102946136B (en) | 2012-10-24 | 2012-10-24 | Circuit and method for switching from power frequency of high-voltage inverter to variable frequency without disturbance |
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| CN102946136B CN102946136B (en) | 2015-05-13 |
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Cited By (6)
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| CN103219942A (en) * | 2013-04-24 | 2013-07-24 | 深圳市英威腾电气股份有限公司 | Method and device for switching variable frequency to power frequency and frequency converter |
| CN103856067A (en) * | 2014-03-31 | 2014-06-11 | 深圳市英威腾电气股份有限公司 | Frequency converter and synchronous working frequency conversion switching control system and method |
| CN104810824A (en) * | 2014-01-26 | 2015-07-29 | 江苏普瑞特科技股份有限公司 | Electrified switching device for an energy-saving cabinet |
| CN105471085A (en) * | 2015-12-23 | 2016-04-06 | 北京动力源科技股份有限公司 | Power frequency-variable frequency switching control method and apparatus and high voltage inverter |
| CN105871291A (en) * | 2016-04-11 | 2016-08-17 | 西南交通大学 | Bumpless transfer method used for frequency converter and common frequency power network |
| CN106602962A (en) * | 2017-02-07 | 2017-04-26 | 北京利德华福电气技术有限公司 | Power-variable frequency operation synchronization switching method based on high voltage frequency converter motor control system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103219942A (en) * | 2013-04-24 | 2013-07-24 | 深圳市英威腾电气股份有限公司 | Method and device for switching variable frequency to power frequency and frequency converter |
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| CN104810824A (en) * | 2014-01-26 | 2015-07-29 | 江苏普瑞特科技股份有限公司 | Electrified switching device for an energy-saving cabinet |
| CN103856067A (en) * | 2014-03-31 | 2014-06-11 | 深圳市英威腾电气股份有限公司 | Frequency converter and synchronous working frequency conversion switching control system and method |
| CN105471085A (en) * | 2015-12-23 | 2016-04-06 | 北京动力源科技股份有限公司 | Power frequency-variable frequency switching control method and apparatus and high voltage inverter |
| CN105871291A (en) * | 2016-04-11 | 2016-08-17 | 西南交通大学 | Bumpless transfer method used for frequency converter and common frequency power network |
| CN105871291B (en) * | 2016-04-11 | 2018-03-20 | 西南交通大学 | One kind is used for frequency converter with common frequency power network without impact switching method |
| CN106602962A (en) * | 2017-02-07 | 2017-04-26 | 北京利德华福电气技术有限公司 | Power-variable frequency operation synchronization switching method based on high voltage frequency converter motor control system |
| CN106602962B (en) * | 2017-02-07 | 2019-02-05 | 北京利德华福电气技术有限公司 | Work converting operation method for synchronously switching based on high-voltage frequency converter electric machine control system |
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| CN102946136B (en) | 2015-05-13 |
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Effective date of registration: 20170731 Address after: 210032 Spark Road 8, hi tech Development Zone, Jiangsu, Nanjing Patentee after: NANJING SAC NEW ENERGY TECHNOLOGY CO., LTD. Address before: 210009 Gulou District, Jiangsu, Nanjing new model road, No. 38 Patentee before: Nanjing Automation Co., Ltd., China Electronics Corp. |