CN202841050U - Cascaded high-voltage inverter speed regulating system with energy feedback function - Google Patents
Cascaded high-voltage inverter speed regulating system with energy feedback function Download PDFInfo
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- CN202841050U CN202841050U CN 201220569995 CN201220569995U CN202841050U CN 202841050 U CN202841050 U CN 202841050U CN 201220569995 CN201220569995 CN 201220569995 CN 201220569995 U CN201220569995 U CN 201220569995U CN 202841050 U CN202841050 U CN 202841050U
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Abstract
The utility model discloses a cascaded high-voltage inverter speed regulating system with energy feedback function. According to the cascaded high-voltage inverter speed regulating system with the energy feedback function, an inverting device of the high-voltage inverter is connected with a power frequency power supply of the high-voltage inverter and is used for driving a motor to work; and the inverting device is connected in parallel with an energy feedback device and is used for notifying the energy feedback device to invert and return the inertia loaded energy to a power grid once a charging phenomenon is detected when the motor is driven to decelerate by the inverter. Compared with the prior art, the cascaded high-voltage inverter speed regulating system with the energy feedback function, disclosed by the utility model, has the advantages that a set of energy feedback devices is connected in parallel based on conventional variable frequency speed regulation system, and the devices do not act or act to compensate the harmonic wave when the inverter runs usually; once quick braking or energy feedback is needed, the devices are started and act in coordination with the inverter so as to feed back the energy to be fed back to the power grid, and as a result, the purposes of feeding back the energy to the power grid and compensating the harmonic wave can be realized on the premise that the high-voltage inverter structure is unchanged.
Description
Technical field
The utility model relates to a kind of high voltage converter governing system, relates in particular to a kind of cascaded high-voltage frequency converter governing system with energy feedback function.
Background technology
For the cascaded high-voltage frequency converter governing system; a lot of occasions need fast braking; or with the energy-feedback power grid of load; for the frequency converter that adopts diode rectification one-way conduction characteristic owing to rectifier bridge under this condition; electrochemical capacitor under this condition in the power cell can be recharged, and causes the dc bus rising and causes frequency converter protection action.In order to address this problem, general way is to adopt the four-quadrant design, and namely the input side of each power model adopts gate-controlled switch, can realize energy in bidirectional flow.But in this scheme, each power module design is complicated, because One's name is legion, reliability reduces, and adopts flat-out controllable devices so that cost raises.Also have and adopt the mode that increases brake resistance in power model, although can effectively reduce braking time, energy is unfavorable for energy-conservation by heat exhaustion.
The utility model content
The purpose of this utility model is to provide a kind of cascaded high-voltage frequency converter governing system with energy feedback function, can not change this body structure of high voltage converter, can reach again the purpose of energy-feedback power grid, effectively reduce deceleration time, solve the shortcoming that prior art exists.
The utility model adopts following technical scheme to realize:
A kind of cascaded high-voltage frequency converter governing system with energy feedback function, the inverter of system's medium-high voltage frequency converter links to each other with the power frequency supply of high voltage converter by phase shifting transformer, the drive motor operation, it is characterized in that, described inverter and an energy back feed device are in parallel, if when frequency converter drive motor reduction of speed, detect charging phenomenon, then notify described energy back feed device to carry out inversion, send the energy of load inertia back to electrical network.
Further, be provided with the three phase inverter bridge, dc-link capacitance and the diode rectification device that are connected in parallel in the described energy back feed device, wherein three phase inverter bridge links to each other with the secondary winding of phase shifting transformer by inductance, and described diode rectification device links to each other with motor by transformer.
Further, be provided with switch between described diode rectification device and the transformer.
Further, described diode rectification device and switching device are in parallel and be connected in series an inductance and form the BOOST circuit.
Further, be parallel with a plurality of gate-controlled switch devices in the described energy back feed device.
Further, comprise the power model that a plurality of series connection form in the described inverter, described power model is by the three-phase commutation bridge that is connected in parallel, dc filter capacitor and IGBT module composition.
The useful technique effect that the utility model possesses is:
A cover energy back feed device in parallel on the basis of existing frequency conversion speed-adjusting system, when frequency converter worked, this device was not worked or is carried out harmonic compensation; When needs fast braking or energy feedback, start this device, the energy feedback that will need feedback with the frequency converter co-ordination is to electrical network, under the prerequisite of not changing this body structure of high voltage converter, can reach again energy-feedback power grid and carry out the purpose of harmonic compensation.
Description of drawings
Fig. 1 is the circuit structure block diagram of the utility model the first embodiment.
Fig. 2 is the circuit structure block diagram of the utility model the second embodiment.
Fig. 3 is the circuit structure block diagram of the utility model the 3rd embodiment.
Fig. 4 is the circuit structure block diagram of the utility model the 4th embodiment.
Embodiment
By following description to embodiment; to more help public understanding the utility model; but can't the specific embodiment that the applicant is given be considered as the restriction to technical solutions of the utility model, any definition to parts or technical characterictic change and/or to overall structure do form and immaterial conversion all should be considered as the protection range that the technical solution of the utility model limits.
The utility model the first embodiment as shown in Figure 1, the inverter 3 of cascaded high-voltage frequency converter governing system medium-high voltage frequency converter links to each other with the power frequency supply 1 of high voltage converter by phase shifting transformer 2, drive motor 4 operations, inverter 3 is in parallel with energy back feed device phase 6, if when frequency converter drive motor 4 reduction of speed, detect charging phenomenon, then notify energy back feed device 6 to carry out inversion, send the energy of load inertia back to electrical network.As preferably, be provided with the three phase inverter bridge 61, dc-link capacitance 63 and the diode rectification device 62 that are connected in parallel in the energy back feed device 6, wherein three phase inverter bridge 61 links to each other with the secondary winding 21 of phase shifting transformer by inductance, and the diode rectification device links to each other with motor 4 by transformer 5.Comprise the power model 31 that a plurality of series connection form in the inverter 3, power model 31 is by the three-phase commutation bridge 311 that is connected in parallel, dc filter capacitor 312 and IGBT(Insulated Gate Bipolar Transistor, insulated gate bipolar transistor) module 313 formations.
The operation principle of energy back feed device is as follows: the inverter 3 by frequency converter during normal operation provides energy to motor 4, drive motor 4 operations, energy back feed device is not worked for 6 this moments, or make three phase inverter bridge 61 be operated in the harmonic compensation mode, the harmonic wave that produces at mains side when reducing frequency converter work.When frequency converter needed quick drive motor reduction of speed, because the inertia of load, the rotor flux of motor 4 may be faster than stator magnetic linkage, and this moment, motor became generator, and the mechanical energy that load inertia produces is converted to electric energy by motor and charges to frequency converter.In a single day frequency converter has detected charging phenomenon, notifies immediately energy back feed device 6 to carry out inversion, sends the energy of load inertia back to electrical network by Transformer Winding, and frequency converter only is operated in excited state this moment, does not provide torque current to load.Energy back feed device 6 provides brake torque to motor, makes fast reduction of speed of motor.After the reduction of speed process is finished, frequency converter notice energy back feed device 6 state of deactivating.
The below is described in further detail the flow process of frequency converter energy feedback:
After frequency converter was finished charging, the drive motor raising speed was to working speed, and frequency converter informs that by communication device energy back feed device 6 do not work or be operated in the harmonic compensation mode during this period, reduces the harmonic wave of frequency converter input side;
After frequency converter receives the reduction of speed instruction, inform that by communication device energy back feed device 6 preparations enter operating state;
Frequency converter detects the electric current of motor, calculates exciting current and torque current through coordinate transform, and it is zero that the phase place of control output voltage makes torque current;
Frequency converter is according to running frequency and output voltage, the real-time required d-c bus voltage value of calculating energy feedback device, and inform energy back feed device;
Energy back feed device is after receiving action command and DC bus-bar voltage command value, and 61 carry out inversion according to instruction, make dc bus be stabilized in command value, and the inertia energy of load this moment is sent electrical network back to by the inversion of energy back feed device;
After DC bus-bar voltage that the rotating speed of load drops to desirable value or energy back feed device was lower than the required minimum voltage of inversion, energy back feed device quit work.
In sum, energy back feed device and frequency converter co-ordination to electrical network, under the prerequisite of not changing this body structure of high voltage converter, can reach the energy feedback that needs feedback again energy-feedback power grid and carry out the purpose of harmonic compensation.
On the basis of the first embodiment, also can do further to improve to energy back feed device: the utility model the second embodiment as shown in Figure 2, between diode rectification device 62 and the transformer 5 switch 7 is set, effect is to avoid energy back feed device overtension when high frequency, the remainder of the present embodiment is identical with the first embodiment, therefore be not repeated herein.
The utility model the 3rd embodiment as shown in Figure 3, diode rectification device 62 is with switching device 63 parallel connections and be connected in series an inductance 64 formation BOOST circuit, the effect of BOOST circuit is to avoid that energy can not feed back to electrical network when low frequency, the remainder of the present embodiment and the first embodiment are as good as, therefore be not repeated herein.Certainly, the present embodiment can also combine to form with the second embodiment and have multi-purpose technical scheme.
The utility model the 4th embodiment is parallel with a plurality of gate-controlled switch devices in the energy back feed device 6 as shown in Figure 4.The remainder of the present embodiment and the first embodiment are as good as, therefore be not repeated herein.Certainly, the present embodiment can also combine to form with second and third embodiment and have multi-purpose technical scheme.
Certainly; the utility model can also have other various embodiments; in the situation that do not deviate from the utility model spirit and essence thereof; those of ordinary skill in the art can make various corresponding changes and distortion according to the utility model, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the utility model.
Claims (6)
1. cascaded high-voltage frequency converter governing system with energy feedback function, the inverter of system's medium-high voltage frequency converter links to each other with the power frequency supply of high voltage converter by phase shifting transformer, the drive motor operation, it is characterized in that, described inverter and an energy back feed device are in parallel, if when frequency converter drive motor reduction of speed, detect charging phenomenon, then notify described energy back feed device to carry out inversion, send the energy of load inertia back to electrical network.
2. the cascaded high-voltage frequency converter governing system with energy feedback function according to claim 1, it is characterized in that, be provided with the three phase inverter bridge, dc-link capacitance and the diode rectification device that are connected in parallel in the described energy back feed device, wherein three phase inverter bridge links to each other with the secondary winding of phase shifting transformer by inductance, and described diode rectification device links to each other with motor by transformer.
3. the cascaded high-voltage frequency converter governing system with energy feedback function according to claim 2 is characterized in that, is provided with switch between described diode rectification device and the transformer.
4. the cascaded high-voltage frequency converter governing system with energy feedback function according to claim 2 is characterized in that, described diode rectification device is with the switching device parallel connection and be connected in series an inductance formation BOOST circuit.
5. the cascaded high-voltage frequency converter governing system with energy feedback function according to claim 1 is characterized in that, is parallel with a plurality of gate-controlled switch devices in the described energy back feed device.
6. each described cascaded high-voltage frequency converter governing system with energy feedback function in 5 according to claim 1, it is characterized in that, comprise the power model that a plurality of series connection form in the described inverter, described power model is by the three-phase commutation bridge that is connected in parallel, dc filter capacitor and IGBT module composition.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201220569995 CN202841050U (en) | 2012-11-01 | 2012-11-01 | Cascaded high-voltage inverter speed regulating system with energy feedback function |
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| CN 201220569995 CN202841050U (en) | 2012-11-01 | 2012-11-01 | Cascaded high-voltage inverter speed regulating system with energy feedback function |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103219896A (en) * | 2013-04-09 | 2013-07-24 | 湖南大学 | Three-phase high-voltage cascade type AC (Alternating Current) -DC (Direct Current) -AC bidirectional converter and control method thereof |
| CN103944439A (en) * | 2014-04-28 | 2014-07-23 | 武汉大学 | Two-motor driving type cascading multi-level inverter system without active front end and control method thereof |
| CN105227040A (en) * | 2014-05-30 | 2016-01-06 | 伊顿公司 | The current-sharing control method of frequency converter parallel connection and control system |
-
2012
- 2012-11-01 CN CN 201220569995 patent/CN202841050U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103219896A (en) * | 2013-04-09 | 2013-07-24 | 湖南大学 | Three-phase high-voltage cascade type AC (Alternating Current) -DC (Direct Current) -AC bidirectional converter and control method thereof |
| CN103219896B (en) * | 2013-04-09 | 2015-01-07 | 湖南大学 | Three-phase high-voltage cascade type AC (Alternating Current) -DC (Direct Current) -AC bidirectional converter and control method thereof |
| CN103944439A (en) * | 2014-04-28 | 2014-07-23 | 武汉大学 | Two-motor driving type cascading multi-level inverter system without active front end and control method thereof |
| CN105227040A (en) * | 2014-05-30 | 2016-01-06 | 伊顿公司 | The current-sharing control method of frequency converter parallel connection and control system |
| CN105227040B (en) * | 2014-05-30 | 2018-11-13 | 伊顿公司 | The current-sharing control method and control system of frequency converter parallel connection |
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