CN1414691A - No-harmonic wave pollution high voltage frequency converter energy back feed device and its method - Google Patents
No-harmonic wave pollution high voltage frequency converter energy back feed device and its method Download PDFInfo
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- CN1414691A CN1414691A CN 02104139 CN02104139A CN1414691A CN 1414691 A CN1414691 A CN 1414691A CN 02104139 CN02104139 CN 02104139 CN 02104139 A CN02104139 A CN 02104139A CN 1414691 A CN1414691 A CN 1414691A
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Abstract
A device to realize the energy feedback for high-voltage frequency converter of power unit in serial type includes feedback bridge and its circuit of trigger and control connected in antiparallel with the rectifying bridge of each power unit. The device uses 6-pulse control mode to compare DC bus bar voltage with the voltage of R, S and T in order to give out the control signal of close/open for the feedback bridge to let the load braking energy feedback to AC electric network, and the device can counter balance the harmonic wave by sufficiently utilizing the phase shifting transformer in the device to make electric network without harmonic wave pollution.
Description
Technical field
The present invention relates to high voltage frequency converter energy back feed device and method thereof, refer to a kind of high voltage frequency converter energy back feed device and method thereof of no-harmonic wave pollution especially.
Background technology
Development along with power electronic technology, frequency converter is as the product of Development of Power Electronic Technology, every field in national economy is widely used as industries such as metallurgy, petrochemical industry, running water, electric power, and bringing into play more and more important effect, particularly, the application of high-voltage alternating variable-frequency governor is day by day extensive.
The power of high-voltage alternating frequency converter is generally all more than 300KW.Its advantage is an obvious energy conservation, and it is obvious to improve working characteristics, and still, its topmost problem in the process of using is: when load is braked, can produce very big energy, how handle or utilize this part energy. be a stubborn problem always.
For the low-voltage alternating-current frequency converter, people normally discharge this part braking energy by big resistance.Just can not lean on this method of resistance of simply utilizing to dissipate for high voltage converter, generally be that it is fed back to electrical network, and braking energy is utilized again, but, how to realize the feedback of this energy, and, perplexing the insider always the AC network no-harmonic wave pollution.
At present, the high-voltage alternating converter plant mainly is divided into two types of voltage-source type and current source types.The current source type converter plant can be realized the energy feedback naturally, but exist power factor low, to shortcomings such as the harmonic pollution of electrical network are big, its application scenario is very restricted.The voltage-source type high voltage frequency converter mainly contains following several types:
1, height mode high voltage converter.This device is that the high pressure with electrical network becomes low pressure by transformer, utilizes the combination of low voltage frequency converter and low voltage motor to realize frequency conversion.
2, the high mode high voltage converter of height.With not being both of above-mentioned height mode frequency converter: it has added a transformer again at the outlet side of low voltage frequency converter, can use high-voltage motor to carry out speed governing.
3, three level mode high voltage converters.It is to utilize the series connection of high tension apparatus to solve problem of withstand voltage.
4, many level of power unit cascade formula high voltage converter.It utilizes the series connection of low pressure and low power unit to realize high pressure, utilizes the harmonic pollution of phase shifting transformer technology solution to electrical network simultaneously, adopts diode rectification, makes the power factor of grid side higher.
The voltage-source type frequency converter of the 1st kind and the 2nd type belongs to transitional technology, has been tending towards superseded, because cost is lower, still has a small amount of application in the small-power occasion.The 3rd type voltage-source type frequency converter is a new technology, but restricted by device, and ceiling voltage can only be accomplished 4160V at present, is not suitable for the main flow electrical network of domestic 6KV, 10KV, and application is restricted; In order to solve the energy feedback and to the harmonic pollution of electrical network, to need to adopt so-called " active front end " technology, rectifier bridge adopts the circuit structure identical with inverter bridge, makes the control complexity, and cost is very high.It is simple that the 4th type voltage-source type frequency converter belongs to technology, and the technical scheme of superior performance, but its energy feedback problem never have solution at present.Therefore, purpose of the present invention just provides a kind of energy back feed device and method thereof at this many level of the power unit cascade formula high voltage converter that generally uses.
Summary of the invention
In order to solve many level of power unit cascade formula high-voltage frequency transformer energy feedback problem, the purpose of this invention is to provide a kind of simple in structure, loss is little, cost is low, power factor is high, to the high voltage frequency converter energy back feed device of electrical network no-harmonic wave pollution.
Another object of the present invention provides a kind of method that realizes the high-voltage frequency transformer energy feedback, and this energy feedback method is realized simple and to the electrical network no-harmonic wave pollution.
For achieving the above object, the present invention by the following technical solutions: a kind of no-harmonic wave pollution high voltage frequency converter energy back feed device, it comprises a plurality of feed back bridgings and feed back bridging control circuit; The quantity of described feed back bridging is consistent with the quantity of the power cell that constitutes frequency converter, promptly at other inverse parallel one feed back bridging of each power cell rectifier bridge; Described feed back bridging control circuit comprises the energy feedback operating mode decision circuitry that is used for conducting of Control and Feedback bridge and shutoff and is used to trigger the feed back bridging circuits for triggering of feed back bridging break-over of device.
Described energy feedback operating mode decision circuitry mainly is made of power cell rectifier bridge commutating voltage peak detection circuit, power cell DC bus-bar voltage testing circuit and comparison/decision circuitry; Rectifier bridge commutating voltage peak detection circuit is used to detect the peak value of voltage after the rectifier bridge rectification, and as a comparison/and an input of decision circuitry; The DC bus-bar voltage testing circuit is used for the voltage between detection power unit dc bus P, the N, and as a comparison/and another input of decision circuitry; Comparison/decision circuitry detects voltage to these two and compares, judges, and the output control signal, the conducting of Control and Feedback bridge or shutoff.
Described feed back bridging circuits for triggering adopt 6 pulse control modes; It is made up of voltage detecting circuit and anti-jamming circuit; This voltage detecting circuit adopts comparator and selector, and for three devices of brachium pontis on the feed back bridging, one that selection voltage is the highest provides triggering signal; For three devices of brachium pontis under the feed back bridging, one that selection voltage is minimum provides triggering signal.
Described feed back bridging circuits for triggering adopt the method for phase discriminator, adopt zero cross detection circuit or phase-locked loop circuit, follow the tracks of the phase place of input voltage, any moment only provides the conducting control signal of two feed back bridging devices, for three devices of last brachium pontis, select R, S, the T instantaneous voltage is the highest one provide Continuity signal; For following three devices of brachium pontis, select R, S, the T instantaneous voltage is minimum one provide Continuity signal.
A kind of realization no-harmonic wave pollution high voltage frequency converter energy feedback method, it may further comprise the steps:
1. by each power cell rectifier bridge of many level of power unit cascade formula high voltage converter, inverse parallel one feed back bridging;
2. the peak value by voltage after voltage between energy feedback operating mode decision circuitry detection power unit dc bus P, the N and the rectifier bridge rectification; And comparison/judgement two detected values; After the power cell d-c bus voltage value is higher than the rectification of power cell rectifier bridge during voltage peak, output control signal, the conducting of beginning Control and Feedback bridge; Otherwise, turn-off feed back bridging;
3., by the feed back bridging circuits for triggering, any moment only provides the conducting control signal of two feed back bridging devices, for three devices of last brachium pontis, select R, S, the T instantaneous voltage is the highest one provide Continuity signal; For following three devices of brachium pontis, select R, S, the T instantaneous voltage is minimum one provide Continuity signal.
Because the present invention adopts above technical scheme,, thereby realize the feedback of braking energy, utilization more promptly at other inverse parallel one feed back bridging of the rectifier bridge of each power cell and control circuit.Because feed back bridging of the present invention is made of the low-voltage device that satisfies power cell builtin voltage standard, so cost is low; In addition, the realization of control section is also very convenient, only needs additional correspondent voltage detection link and voltage comparator to get final product, and technical feasibility is good; In control, saved complicated PWM calculating etc., reduced the burden of control circuit, simultaneously, because on-off mode is six pulses, it is minimum that switching loss is dropped to.The more important thing is, though contain a large amount of harmonic componentss in the current waveform of general-purpose diode rectifier bridge in the power cell of the present invention, and a large amount of harmonic componentss that also have in the feed back bridging, it can pass through phase shifting transformer, harmonic components is cancelled each other, thereby reduce harmonic pollution electrical network.
Description of drawings
The invention will be further described below in conjunction with accompanying drawing.
Fig. 1 is existing many level of power unit cascade formula high voltage converter structural representation
Fig. 2 is existing power cell circuit diagram
Fig. 3 is feed back bridging partial circuit figure in the energy back feed device of the present invention
Fig. 4 is energy feedback operating mode judging circuit theory diagram in the energy back feed device of the present invention
Fig. 5 is feed back bridging circuits for triggering theory diagram in the energy back feed device of the present invention
Fig. 6 is feed back bridging part physical circuit figure in the embodiment of the invention
Fig. 7 is energy feedback operating mode judging circuit physical circuit figure in the embodiment of the invention
Fig. 8 is feed back bridging circuits for triggering physical circuit figure in the embodiment of the invention
Embodiment
As shown in Figure 1, at present, generally many level of power unit cascade formula high voltage converter of Shi Yonging mainly by many secondary winding phase shifting transformer 1 ', a plurality of power cell 2 ' and control system 3 ' constitute; Wherein, a plurality of power cells 2 ' being one another in series forms high-voltage ac power U, V, the W of frequency adjustable.Constitute the main components and parts power cell 2 of this form high voltage converter ' internal structure as shown in Figure 2, it mainly by diode rectifier bridge 21 ', be connected in parallel on the big electric capacity, grading resistor 22 of dc bus side ' and inverter bridge 23 ' constitute.Because the internal structure of this form high voltage converter is not an inventive point of the present invention, so state its internal structure is no longer auspicious at this, its detailed operation principle can be referring to pertinent literature.
In the use of many level of power unit cascade formula high voltage converter, when load is braked, can produce very big energy.For this part energy is fed back to electrical network, utilize again, the present invention in the other inverse parallel of power cell rectifier bridge one feed back bridging, by the conducting and the shutoff of control circuit Control and Feedback bridge, thereby make braking energy feed back to electrical network.
As Fig. 3, Fig. 4, shown in Figure 5, energy back feed device of the present invention mainly is made of a plurality of feed back bridgings 1 and control circuit 2; Control circuit 2 is again to be made of energy feedback operating mode decision circuitry 21 and feed back bridging circuits for triggering 22.The quantity of feed back bridging 1 is consistent with the quantity of the power cell that constitutes frequency converter, promptly at each power cell 3 rectifier bridges 31 other inverse parallel one feed back bridging 1 (as shown in Figure 3).When frequency converter normally moved, feed back bridging 1 turn-offed, and the work of circuit other parts is the same when not having this feed back bridging.When motor braking moves, energy feeds back in the dc-link capacitance 32 by power cell inverter bridge 33, cause capacitance voltage to raise, when capacitance voltage is higher than the commutating voltage peak value of diode rectifier bridge 31, diode rectifier bridge turn-offs, can selectively make the break-over of device of feed back bridging 1 this moment, and the energy in the capacitor is fed back to electrical network by feed back bridging, phase-shifting rectifier transformer.
For the conducting and the shutoff of Control and Feedback bridge 1, energy back feed device design of the present invention has 21 (as shown in Figure 4) of energy feedback operating mode decision circuitry and feed back bridging circuits for triggering 22 (as shown in Figure 5).
As shown in Figure 4, energy feedback operating mode decision circuitry 21 mainly is made of power cell rectifier bridge commutating voltage peak detection circuit 211, power cell DC bus-bar voltage testing circuit 212 and comparison/decision circuitry 213.Rectifier bridge commutating voltage peak detection circuit 211 is used to detect the peak value V1 of voltage after the rectifier bridge rectification, and as a comparison/and an input of decision circuitry 213; DC bus-bar voltage testing circuit 212 is used for the voltage V2 between detection power unit dc bus P, the N, and as a comparison/and another input of decision circuitry 213; Comparison/decision circuitry 213 detects voltage to these two and compares, judges.After DC bus-bar voltage V2 is greater than the rectifier bridge rectification during peak value V1 of voltage, comparison/decision circuitry output control signal, the conducting of beginning Control and Feedback bridge; Otherwise, turn-off feed back bridging.
In order to make feed back bridging 1 conducting, the present invention has designed feed back bridging circuits for triggering 22, and these circuits for triggering adopt 6 pulse control modes, as shown in Figure 5.Any moment only provides the conducting control signal of two feed back bridging devices, for three devices of last brachium pontis, select R, S, the T instantaneous voltage is the highest one provide Continuity signal; For following three devices of brachium pontis, select R, S, the T instantaneous voltage is minimum one provide Continuity signal.Feed back bridging is operated under the state identical with diode bridge, and just the direction of electric current and energy Flow is opposite.As shown in Figure 5, Fig. 5 (a) adopts the direct voltage detection method, and for three devices of last brachium pontis, one that selection voltage is the highest provides triggering signal; For three devices of following brachium pontis, one that selection voltage is minimum provides triggering signal; Voltage detecting can adopt comparator and selector, simultaneously jamproof filtering measures must be arranged.Another method is the method for the employing phase discriminator shown in Fig. 5 (b), as everyone knows, per 120 degree of three-phase ac power supply just have one in the phase places, and to be in voltage mutually the highest, per 120 degree have one in the phase places, and to be in voltage mutually minimum, therefore very fixing of this relation, can adopt common methods such as zero passage detection or phase-locked loop, the phase place of following the tracks of input voltage provides control impuls, and the effect that two kinds of methods reach is consistent.
Fig. 6, Fig. 7, Fig. 8 are specific embodiment of the invention figure.As shown in Figure 6, feed back bridging 1 of the present invention is made up of 6 IGBT high power transistor G1～G6, and inverse parallel is other at power cell rectifier bridge 31.The present invention adopts IGBT to constitute feed back bridging, also can adopt other switch element such as GTO, controllable silicon etc. to constitute feed back bridging.
Fig. 7 is energy feedback operating mode decision circuitry physical circuit figure of the present invention.As shown in the figure, the present invention earlier is converted into control circuit acceptable voltage R1, S1, T1 by voltage transformer 4 with the voltage at power cell R, S, T place; Then, through rectifier bridge 5 rectifications; Get its voltage as the rectifier bridge rectification after the peak value V1 of voltage.V2 is the voltage between process dc bus P, the N of electrical isolation 6.Through comparison/judgements of comparator U7, gate U8, when V2＞V1, output control signal EN2 allows the feed back bridging circuits for triggering to work.Among the figure, EN1 is the instruction that system allows energy back feed device work, because in some cases, can not allow the system feedback circuit working by artificial setting, EN2 is that FEEDBACK CONTROL allows logic, feed back bridging circuits for triggering start working (referring to Fig. 8) when EN2 is effective.
Fig. 8 is feed back bridging circuits for triggering physical circuit figure of the present invention.As shown in the figure, it is made of comparator U9～U11, decoder U12 and gate U13～U18.Comparator U9～U11 at first compares three-phase voltage, obtain three comparison signal COMP1～COMP3, if FEEDBACK CONTROL conditions being possessed (EN2=1), then can be with 6 kinds of possibilities of comparable situation, translate (one has 8 kinds of states, and wherein two states is physically impossible) by decoder U12 (74138), then according to these states, by simple logical circuit U13～U18, can obtain the triggering signal of feed back bridging device G1～G6.
Certainly,, also need other auxiliary circuit, as drive circuit of, IGBT etc. in order to realize above-mentioned control measure; If use controllable silicon to constitute feed back bridging, also need controllable silicon to force breaking circuit, controllable silicon pulse transformer circuits for triggering etc., these belong to this area general technology, do not list one by one at this.
In sum, the present invention realizes that the method for energy feedback is:
1, by each power cell rectifier bridge of many level of power unit cascade formula high voltage converter, inverse parallel one feed back bridging;
2, the peak value by voltage after voltage between energy feedback operating mode decision circuitry detection power unit dc bus P, the N and the rectifier bridge rectification; And comparison/judgement two detected values; After the power cell d-c bus voltage value is higher than the rectification of power cell rectifier bridge during voltage peak, output control signal, the conducting of beginning Control and Feedback bridge; Otherwise, turn-off feed back bridging;
3, by the feed back bridging circuits for triggering, any moment only provides the conducting control signal of two feed back bridging devices, for three devices of last brachium pontis, select R, S, the T instantaneous voltage is the highest one provide Continuity signal; For following three devices of brachium pontis, select R, S, the T instantaneous voltage is minimum one provide Continuity signal.
Only in order to explanation the present invention, clearly the present invention is not subjected to the restriction of these embodiment to above embodiment.Any modification of those of ordinary skill in the art, be out of shape or be equal to replacement, all be encompassed in the middle of the claim scope of the present invention based on flesh and blood of the present invention.
Claims (7)
1, a kind of no-harmonic wave pollution high voltage frequency converter energy back feed device is characterized in that:
It comprises a plurality of feed back bridgings and feed back bridging control circuit;
The quantity of described feed back bridging is consistent with the quantity of the power cell that constitutes frequency converter, promptly at other inverse parallel one feed back bridging of each power cell rectifier bridge;
Described feed back bridging control circuit comprises the energy feedback operating mode decision circuitry that is used for conducting of Control and Feedback bridge and shutoff and is used to trigger the feed back bridging circuits for triggering of feed back bridging break-over of device.
2, no-harmonic wave pollution high voltage frequency converter energy back feed device according to claim 1 is characterized in that: described energy feedback operating mode decision circuitry mainly is made of power cell rectifier bridge commutating voltage peak detection circuit, power cell DC bus-bar voltage testing circuit and comparison/decision circuitry; Rectifier bridge commutating voltage peak detection circuit is used to detect the peak value of voltage after the rectifier bridge rectification, and as a comparison/and an input of decision circuitry; The DC bus-bar voltage testing circuit is used for the voltage between detection power unit dc bus P, the N, and as a comparison/and another input of decision circuitry; Comparison/decision circuitry detects voltage to these two and compares, judges, and the output control signal, the conducting of Control and Feedback bridge or shutoff.
3, no-harmonic wave pollution high voltage frequency converter energy back feed device according to claim 1 is characterized in that: described feed back bridging circuits for triggering adopt 6 pulse control modes; It is made up of voltage detecting circuit and anti-jamming circuit; This voltage detecting circuit adopts comparator and selector, and for three devices of brachium pontis on the feed back bridging, one that selection voltage is the highest provides triggering signal; For three devices of brachium pontis under the feed back bridging, one that selection voltage is minimum provides triggering signal.
4, no-harmonic wave pollution high voltage frequency converter energy back feed device according to claim 1, it is characterized in that: described feed back bridging circuits for triggering adopt the method for phase discriminator, adopt zero cross detection circuit or phase-locked loop circuit, follow the tracks of the phase place of input voltage, any moment only provides the conducting control signal of two feed back bridging devices, for three devices of last brachium pontis, select R, S, the T instantaneous voltage is the highest one provide Continuity signal; For following three devices of brachium pontis, select R, S, the T instantaneous voltage is minimum one provide Continuity signal.
5, no-harmonic wave pollution high voltage frequency converter energy back feed device according to claim 2 is characterized in that: described energy feedback operating mode decision circuitry mainly is made of voltage transformer, diode rectifier bridge, electrical isolation circuit and comparator;
Power cell AC side voltage after voltage transformer, rectifier bridge rectification, get its voltage as the rectifier bridge rectification after the peak value of voltage, and link to each other with an input of comparator;
Voltage between power cell dc bus P, the N links to each other with another input of comparator behind the electrical isolation circuit;
The signal output part of comparator links to each other with the control end of feed back bridging circuits for triggering.
6, no-harmonic wave pollution high voltage frequency converter energy back feed device according to claim 3 is characterized in that: described feed back bridging circuits for triggering are made of comparator, decoder and logical circuit; The input of comparator links to each other with three-phase alternating voltage respectively, and it is compared; The output of comparator links to each other with logical circuit by decoder, and the output of logical circuit links to each other with the trigger end of feed back bridging device.
7, a kind of realization no-harmonic wave pollution high voltage frequency converter energy feedback method, it is characterized in that: it may further comprise the steps:
1. by each power cell rectifier bridge of many level of power unit cascade formula high voltage converter, inverse parallel one feed back bridging;
2. the peak value by voltage after voltage between energy feedback operating mode decision circuitry detection power unit dc bus P, the N and the rectifier bridge rectification; And comparison/judgement two detected values; After the power cell d-c bus voltage value is higher than the rectification of power cell rectifier bridge during voltage peak, output control signal, the conducting of beginning Control and Feedback bridge; Otherwise, turn-off feed back bridging;
3., by the feed back bridging circuits for triggering, any moment only provides the conducting control signal of two feed back bridging devices, for three devices of last brachium pontis, select R, S, the T instantaneous voltage is the highest one provide Continuity signal; For following three devices of brachium pontis, select R, S, the T instantaneous voltage is minimum one provide Continuity signal.
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| CN 02104139 CN1253998C (en) | 2002-03-08 | 2002-03-08 | No-harmonic wave pollution high voltage frequency converter energy back feed device and its method |
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| CN 02104139 CN1253998C (en) | 2002-03-08 | 2002-03-08 | No-harmonic wave pollution high voltage frequency converter energy back feed device and its method |
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| CN1414691A true CN1414691A (en) | 2003-04-30 |
| CN1253998C CN1253998C (en) | 2006-04-26 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102035360A (en) * | 2009-09-29 | 2011-04-27 | 株式会社安川电机 | Pwm cycloconverter device |
| CN102412735A (en) * | 2011-12-06 | 2012-04-11 | 中国煤炭科工集团太原研究院 | Control method used four-quadrant transducer |
| US8345453B2 (en) | 2007-09-21 | 2013-01-01 | Mitsubishi Electric Corporation | Power conversion apparatus for electric vehicle |
| CN103036449A (en) * | 2011-09-30 | 2013-04-10 | 苏州汇川技术有限公司 | Four-quadrant three-level power unit and high-voltage inverter |
| CN101702850B (en) * | 2009-10-27 | 2013-06-05 | 嘉力时灯光设备(东莞)有限公司 | Circuit and method for switching off load of controlled silicon |
| CN104184343A (en) * | 2013-05-21 | 2014-12-03 | 宝山钢铁股份有限公司 | Silicon controlled rectifier rectification feedback apparatus |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1949645B (en) * | 2006-10-13 | 2013-02-13 | 北京合康亿盛变频科技股份有限公司 | Energy feedback power unit |
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- 2002-03-08 CN CN 02104139 patent/CN1253998C/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8345453B2 (en) | 2007-09-21 | 2013-01-01 | Mitsubishi Electric Corporation | Power conversion apparatus for electric vehicle |
| CN102035360A (en) * | 2009-09-29 | 2011-04-27 | 株式会社安川电机 | Pwm cycloconverter device |
| CN102035360B (en) * | 2009-09-29 | 2014-07-23 | 株式会社安川电机 | Pwm cycloconverter device |
| CN101702850B (en) * | 2009-10-27 | 2013-06-05 | 嘉力时灯光设备(东莞)有限公司 | Circuit and method for switching off load of controlled silicon |
| CN103036449A (en) * | 2011-09-30 | 2013-04-10 | 苏州汇川技术有限公司 | Four-quadrant three-level power unit and high-voltage inverter |
| CN102412735A (en) * | 2011-12-06 | 2012-04-11 | 中国煤炭科工集团太原研究院 | Control method used four-quadrant transducer |
| CN104184343A (en) * | 2013-05-21 | 2014-12-03 | 宝山钢铁股份有限公司 | Silicon controlled rectifier rectification feedback apparatus |
| CN104184343B (en) * | 2013-05-21 | 2017-01-11 | 宝山钢铁股份有限公司 | Silicon controlled rectifier rectification feedback apparatus |
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| CN1253998C (en) | 2006-04-26 |
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