CN102843094A - High voltage variable frequency control system - Google Patents
High voltage variable frequency control system Download PDFInfo
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- CN102843094A CN102843094A CN2012103540888A CN201210354088A CN102843094A CN 102843094 A CN102843094 A CN 102843094A CN 2012103540888 A CN2012103540888 A CN 2012103540888A CN 201210354088 A CN201210354088 A CN 201210354088A CN 102843094 A CN102843094 A CN 102843094A
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Abstract
The invention relates to a high voltage variable frequency control system. The variable frequency control system comprises a phase-shifting transformer; the primary side of the phase-shifting transformer is connected with an electric grid; a secondary side comprises at least two groups, and each group consists of three secondary coils: A phase, B phase and C phase secondary coils; the three secondary coils in each group have the same connection method; and each secondary coil is connected with an uncontrollable rectification-controllable inversion power unit. The variable frequency control system disclosed by the invention adopts a multi-stage phase-shifting rectification mode with each phase voltage consisting of multiple serially connected power voltages, thus the voltage born by a power tube of each power unit is reduced by multiple times, the cost is greatly reduced and the reliability of the overall system is improved.
Description
Technical field
The present invention relates to a kind of high-pressure frequency-conversion control system.
Background technology
Existing frequency-changing control system is main usually, and control rectifying circuit, controlled three-phase inverting circuit do not constitute by transformer, diode; Pass through PWM mode power controlling pipe in the inversion link; Like the triggering of IGBT, produce amplitude and all adjustable three-phase alternating voltage of frequency, offer motor.
If directly such scheme is applied to the high-pressure frequency-conversion system, inverter circuit required power pipe has very high rated voltage, and cost is high.And the high order harmonic component that the circuit of such scheme produces is big to electric network pollution.
Summary of the invention
The purpose of this invention is to provide a kind of high-pressure frequency-conversion control system, in order to the frequency-changing control system cost height that solves prior art, the problem of side harmonics poor performance.
For realizing above-mentioned purpose; Scheme of the present invention is: a kind of high-pressure frequency-conversion control system, comprise phase shifting transformer, and the primary side of phase shifting transformer is used to connect electrical network; Secondary side comprises at least two groups, every group of A phase, B phase, C three secondary coils mutually, three secondary coils of every group to connect method identical; Each secondary coil all connects a power cell of not controlling rectification-controlled inversion, and each power cell has two lead-out terminals, and lead-out terminal is exported the single phase alternating current (A.C.) voltage of the corresponding phase sequence of connected secondary coil; The A of the said high-pressure frequency-conversion control system of the end to end formation of the output of each power cell of corresponding A phase exports mutually; The B of the said high-pressure frequency-conversion control system of the end to end formation of output of each power cell of corresponding B phase exports mutually, and the C of the said high-pressure frequency-conversion control system of the end to end formation of the output of the power cell of corresponding C phase exports mutually; Said A exports mutually, B exports mutually, C exports mutually and forms the Y-connection mode, is used for power supply and connects high-voltage motor; Said high-pressure frequency-conversion control system also comprises the controller of controlling said power cell.
The power tube of the controlled inversion part of said power cell is the IGBT module.
The primary side of said phase shifting transformer is provided with the input voltage and input current instrument transformer; The power input of high-voltage motor is provided with the output voltage current transformer; High-voltage motor is provided with the encoder of measuring rotating speed, and the output signal of said input voltage and input current instrument transformer, output voltage current transformer, encoder connects said controller.The present invention adopts the mode of multistage phase-shifting commutation, and every phase voltage is all produced by a plurality of power voltage series connection.Thereby the power tube that makes each power cell bears voltage to be reduced at double, has significantly reduced cost, has improved the reliability of whole system.Many level PWMs control mode provides sine-wave current output, and common-mode voltage and dV/dt are little, and motor, cable are not had specific (special) requirements, and old equipment frequency conversion is transformed, and need not change motor.Adopt multistage rectification, multipleization of input transformer secondary coil reduced the pollution of higher harmonic current to electrical network.
Description of drawings
Fig. 1 is circuit theory diagrams of the present invention;
Fig. 2 is power cell circuit theory diagrams of the present invention;
Fig. 3 is the high frequency transformer electric hookup;
Fig. 4 is many level stack sketch mapes.
Fig. 5, Fig. 6 are respectively the method sketch mapes that two kinds of processing power unit of the present invention damage.
Embodiment
Below in conjunction with accompanying drawing the present invention is done further detailed explanation.
A kind of high-pressure frequency-conversion control system as shown in Figure 1; Comprise phase shifting transformer; The primary side of phase shifting transformer is used to connect electrical network (3kV/6kV/10kV/); Secondary side comprises 5 groups of totally 15 secondary coils, and two groups of secondary coils are divided into three kinds mutually of A phase, B phase, C, every group of three secondary coils to connect method identical.The secondary coil of corresponding A phase connects power cell A1, A2, A3, A4, A5, and the secondary coil of corresponding B phase connects power cell B1, B2, B3, B4, B5, and the secondary coil of corresponding C phase connects power cell C1, C2, C3, C4, C5.As shown in Figure 2,15 power cell structure are identical, are the power cell of not controlling rectification-controlled inversion, and the power tube of the controlled inversion part of power cell is the IGBT module, and each power cell all has two ac output ends.The A of the end to end formation high-pressure frequency-conversion of the output control system of the power cell A1 of corresponding A phase, A2, A3, A4, A5 exports mutually; The B of the said high-pressure frequency-conversion control system of the end to end formation of output of the power cell B1 of corresponding B phase, B2, B3, B4, B5 exports mutually, and the C of the said high-pressure frequency-conversion control system of the end to end formation of output of the power cell C1 of corresponding C phase, C2, C3, C4, C5 exports mutually.A exports mutually, B exports mutually, C exports mutually and forms the Y-connection mode, and is as shown in Figure 4, is used for power supply and connects high-voltage motor.
The high-pressure frequency-conversion control system also comprises the controller of power controlling unit; It is master control borad shown in Fig. 1; Master control borad connects Optical Transceiver Card through optical fiber; Through the IGBT module of first group of power cell A1 of Optical Transceiver Card 1 control triggering, B1, C1,, trigger the IGBT module of first group of power cell A3, B3, C3 through Optical Transceiver Card 3 controls through the IGBT module of second group of power cell A2 of Optical Transceiver Card 2 control triggerings, B2, C2; Through the IGBT module of first group of power cell A4 of Optical Transceiver Card 4 control triggerings, B4, C4, trigger the IGBT module of first group of power cell A5, B5, C5 through Optical Transceiver Card 5 controls.The pattern identification of the phase shifting transformer secondary side of Fig. 1 is represented the phase shift angle, is 60 ° of phase shifts like triangle.
The primary side of phase shifting transformer is provided with the input voltage and input current instrument transformer; The power input of high-voltage motor is provided with the output voltage current transformer; High-voltage motor is provided with the encoder of measuring rotating speed, and the output signal of input voltage and input current instrument transformer, output voltage current transformer, encoder is connected to controller through a signal acquiring board.Controller connects operating equipments such as HMI (remote supervisory and control(ling) equipment) and touch-screen, and other subsequent use I/O equipment etc.
Like Fig. 3 is the high-pressure frequency-conversion control system, the electrical connection diagram of AS800 high-pressure frequency-conversion controller in promptly scheming, and the mode of connection is simple, and input connects inlet wire through circuit breaker Q F1, and KM3 is a by-pass switch, and KM1 input disconnecting link, KM2 are for connecting the disconnecting link of high-voltage motor M.
Frequency-changing control system output of the present invention is as shown in Figure 4, and 5 groups of power cells, the A of every group of power cell are in series, B is in series, C is in series, each power cell output 690V, and then phase voltage is 3450V, line voltage is 6000V.
Adopt multistage phase shift system of the present invention, the power tube withstand voltage is low, saves cost.And owing to adopt this structure, can the voltage classification be added, as begin to drop into one group of A1, B1, C1 power cell, dropping into other group power cells then gradually, suffered starting current of motor and impulse current are little, are beneficial to the prolongation electrical machinery life.
Like Fig. 5, Fig. 6 is to handle two kinds of methods that some power cells damage.Each power cell be equipped with can its output of short circuit bypass.As A when mutually certain power cell damages, Fig. 5 be with this power cell of A phase and B, C mutually with it the power cell of correspondence all bypass, guarantee the output voltage equilibrium with this, output voltage reduces to original 80%.Fig. 6 is this power unit by-pass with the A phase, and B, C through PWM control, adjust each power cell output voltage vector angle mutually; Maximum at output voltage, under the unequal situation of phase voltage, guarantee maximum voltage output; Adopt this line electric voltage equalization method, voltage reduces to original 93.3%.
Beneficial effect of the present invention also comprises:
Many level PWMs control mode provides sine-wave current output, and common-mode voltage and dV/dt are little, and motor, cable are not had specific (special) requirements, and old equipment frequency conversion is transformed, and need not change motor.
Adopt multistage rectification, multipleization of input transformer secondary coil reduced the pollution of higher harmonic current to electrical network.
Sensor measurement net side input voltage and input current, frequency converter output voltage electric current and motor speed; Can carry out the high precision velocity closed-loop control; Can the huge high starting torque of output, satisfy the technological requirement of various high targets of the heavy duty application scenario of enterprises such as colliery, chemical industry.
The high order harmonic component cost that contains in the output current is little, and consequent pulsation moment can be ignored to the influence power of axle system.
Constant pressure source type VFC can be kept High Power Factor in full speed range.
Many level PWM controls, the HF switch loss of having subdued IGBT self.
Claims (3)
1. high-pressure frequency-conversion control system; It is characterized in that, comprise phase shifting transformer, the primary side of phase shifting transformer is used to connect electrical network; Secondary side comprises at least two groups, every group of A phase, B phase, C three secondary coils mutually, three secondary coils of every group to connect method identical; Each secondary coil all connects a power cell of not controlling rectification-controlled inversion, and each power cell has two lead-out terminals, and lead-out terminal is exported the single phase alternating current (A.C.) voltage of the corresponding phase sequence of connected secondary coil; The A of the said high-pressure frequency-conversion control system of the end to end formation of the output of each power cell of corresponding A phase exports mutually; The B of the said high-pressure frequency-conversion control system of the end to end formation of output of each power cell of corresponding B phase exports mutually, and the C of the said high-pressure frequency-conversion control system of the end to end formation of the output of the power cell of corresponding C phase exports mutually; Said A exports mutually, B exports mutually, C exports mutually and forms the Y-connection mode, is used for power supply and connects high-voltage motor; Said high-pressure frequency-conversion control system also comprises the controller of controlling said power cell.
2. a kind of high-pressure frequency-conversion control system according to claim 1 is characterized in that, the power tube of the controlled inversion part of said power cell is the IGBT module.
3. a kind of high-pressure frequency-conversion control system according to claim 1; It is characterized in that; The primary side of said phase shifting transformer is provided with the input voltage and input current instrument transformer; The power input of high-voltage motor is provided with the output voltage current transformer, and high-voltage motor is provided with the encoder of measuring rotating speed, and the output signal of said input voltage and input current instrument transformer, output voltage current transformer, encoder connects said controller.
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| CN2012103540888A CN102843094A (en) | 2012-09-21 | 2012-09-21 | High voltage variable frequency control system |
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| CN2012103540888A CN102843094A (en) | 2012-09-21 | 2012-09-21 | High voltage variable frequency control system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106849691A (en) * | 2017-01-23 | 2017-06-13 | 青岛天信电气有限公司 | A kind of method of mining 10KV explosion-proof frequency converters and its control motor |
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| US6301130B1 (en) * | 1999-09-01 | 2001-10-09 | Robicon Corporation | Modular multi-level adjustable supply with parallel connected active inputs |
| CN1361586A (en) * | 2000-12-27 | 2002-07-31 | 深圳市安圣电气有限公司 | Multiple-level serially connected high-voltage inverter |
| CN101291071A (en) * | 2008-06-18 | 2008-10-22 | 张皓 | Electric inverter for direct grid connecting of wind power generation |
| CN102158097A (en) * | 2011-04-07 | 2011-08-17 | 李永盼 | Energy feedback type power unit cascaded high voltage frequency converter |
| CN202206344U (en) * | 2011-07-27 | 2012-04-25 | 广州智光电气股份有限公司 | Integrated control system based on high-voltage motor control and reactive power compensation |
| CN202798570U (en) * | 2012-09-21 | 2013-03-13 | 郑州赛金电气有限公司 | High voltage variable frequency control system |
-
2012
- 2012-09-21 CN CN2012103540888A patent/CN102843094A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6301130B1 (en) * | 1999-09-01 | 2001-10-09 | Robicon Corporation | Modular multi-level adjustable supply with parallel connected active inputs |
| CN1361586A (en) * | 2000-12-27 | 2002-07-31 | 深圳市安圣电气有限公司 | Multiple-level serially connected high-voltage inverter |
| CN101291071A (en) * | 2008-06-18 | 2008-10-22 | 张皓 | Electric inverter for direct grid connecting of wind power generation |
| CN102158097A (en) * | 2011-04-07 | 2011-08-17 | 李永盼 | Energy feedback type power unit cascaded high voltage frequency converter |
| CN202206344U (en) * | 2011-07-27 | 2012-04-25 | 广州智光电气股份有限公司 | Integrated control system based on high-voltage motor control and reactive power compensation |
| CN202798570U (en) * | 2012-09-21 | 2013-03-13 | 郑州赛金电气有限公司 | High voltage variable frequency control system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106849691A (en) * | 2017-01-23 | 2017-06-13 | 青岛天信电气有限公司 | A kind of method of mining 10KV explosion-proof frequency converters and its control motor |
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Application publication date: 20121226 |