CN201041997Y - Middle voltage frequency conversion speed-adjustable device for wind blower and water pump - Google Patents
Middle voltage frequency conversion speed-adjustable device for wind blower and water pump Download PDFInfo
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- CN201041997Y CN201041997Y CNU2006201517779U CN200620151777U CN201041997Y CN 201041997 Y CN201041997 Y CN 201041997Y CN U2006201517779 U CNU2006201517779 U CN U2006201517779U CN 200620151777 U CN200620151777 U CN 200620151777U CN 201041997 Y CN201041997 Y CN 201041997Y
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- frequency conversion
- conversion power
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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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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Abstract
The utility model relates to a medium-voltage frequency-conversion speed regulating device special for a fan or a water pump. The speed regulating device consists of a plurality of stacking H-bridge medium-voltage frequency-conversion power units. A plurality of H-bridge medium-voltage frequency-conversion power units are serially connected to a phase; three phases are connected in star shape, and then connected with a motor. The frequency-conversion power unit is an alternating-direct-alternating three-phase rectification/single-phase inversion circuit; the rectification side is a high-voltage diode three-phase full bridge, which performs PWM pulse-width modulation via an IGBT inversion bridge to obtain single-phase alternating current output; the output side consists of the output terminal of each frequency-conversion power unit in mutual serial connection to form star-shaped connection, and supply power for the motor. The device has simple and clear structure, relatively easy control, anti-interference ability, exceedingly high safety, wide speed-regulation range, high efficiency, energy-saving property, high input power factor and good starting performance and lengthens the service lives of the motor and the mechanical system; in addition, the quantity of the frequency-conversion power units is low, thereby reducing the maintenance cost, facilitating use and maintenance and modularizing the units.
Description
Technical field
The utility model belongs to the RHVC field, relates to the RHVC of a kind of blower fan, water pump special use, is specially adapted to the medium voltage converter speed regulating device of single quadrant running loads such as blower fan, water pump.
Background technology
Frequency control is with its excellent speed governing and startability, numerous advantages such as high efficiency, High Power Factor and power savings and be considered to one of the most rising mode of speed regulation.Along with the development of middle high-power high voltage variable-frequency control technique, the mesohigh RHVC is widely used.For a long time, because the voltage withstand class of power electric component and the electric current that bears are restricted, cause a difficult problem of mating with 6KV, 10KV supply power voltage, so present domestic mesohigh RHVC, can only be formed by stacking by a plurality of low pressure H bridgings frequency power unit cascades, by a plurality of frequency conversion power unit series connection, constitute a phase, the three-phase Y-connection is connected with motor.The weak point of the RHVC of this multistage low pressure IGBT frequency conversion power unit overlapped in series is that each elementary cell of circuit all needs an independently DC power supply, along with level number increases, the DC power supply number that the cascade circuit unit uses also rolls up, power cell and the power device quantity used are many, increase equipment drops into, device volume is big, and it is big to take installing space.The power cell of each series connection is many, and failure rate is higher.Failure rate is directly proportional with the series unit number.
Summary of the invention
Problem to be solved in the utility model is, overcomes the deficiencies in the prior art, and a kind of medium voltage converter speed regulating device by the power unit cascade stack frequently of middle pressure H bridging are provided, and is exclusively used in the blower fan, water pump of single quadrant running load etc.
The utility model solves its technical problem and takes following technical scheme to realize:
A kind of blower fan that provides according to the utility model and the medium voltage converter speed regulating device of water pump special use, comprise frequency conversion power unit, power isolation transformer, controller, this device is made up of a plurality of H bridge medium voltage converter power cell stacks, press H bridging frequency power unit cascade to constitute a phase in a plurality of, the three-phase Y-connection is connected with motor; Described frequency conversion power unit is AC-DC-AC three phase rectifier/single-phase inversion circuit, the rectification side is the high-voltage diode three phase full bridge, carry out the PWM pulse-width modulation by the IGBT inverter bridge, the output of acquisition single phase alternating current (A.C.), outlet side is composed in series Y-connection mutually by U, the V lead-out terminal of each frequency conversion power unit, powers to motor; The secondary winding of power isolation transformer is divided into many groups, and a kind of winding is connected into triangle, and another kind of winding is connected into star, respectively the rectifier bridge of frequency conversion power unit is powered; Controller is made up of high speed digital signal processor DSP, industrial computer and PLC programmable controller, adopts optical fiber communication technology between controller and the frequency conversion power unit.
It is to take following technical scheme further to realize that the utility model solves its technical problem:
Aforesaid 6KV medium voltage converter speed regulating device press the power cell stack frequently of H bridging to form in 6, and per 2 frequency conversion power units series connection constitutes a phase, and the three-phase Y-connection is connected with the 6KV motor.
Aforesaid 10KV medium voltage converter speed regulating device press the power cell stack frequently of H bridging to form in 9, and per 3 frequency conversion power units series connection constitutes a phase, and the three-phase Y-connection is connected with the 10KV motor.
The utility model compared with prior art has significant advantage and beneficial effect.
The DC power supply that the utility model adopts DC side to be separated from each other, there is not the electric voltage equalization problem, this apparatus structure is simply clear, control method is simple relatively, can carry out the PWM pulse width control to every grade respectively, need not clamping diode or clamping capacitance, be easy to encapsulation, unit-modularized, and do not have middle dc voltage mid point offset problem, frequency conversion power unit negligible amounts.This device adopts high speed digital signal processor DSP, has high arithmetic speed and powerful computing ability, guarantees the reliability of native system control section, high real-time, thus for realizing powerful hardware, the PWM pulse-width modulation guarantees.Adopt optical fiber communication technology between controller and the frequency conversion power unit, strong and weak electricity is isolated to solve, interference problem.Therefore, the anti-interference of system, fail safe are high.This device speed adjustable range is big, energy-efficient, the input power factor height, and startability is good, prolongs motor and mechanical system useful life, reduces maintenance cost, uses, easy to maintenance.
Embodiment of the present utility model is provided in detail by following examples and accompanying drawing thereof.
Description of drawings
Fig. 1 system of the present utility model inserts figure;
Two frequency conversion power unit overlapped in series of Figure 26 KV RHVC schematic diagram;
Three frequency conversion power unit overlapped in series of Figure 31 0KV RHVC schematic diagram;
The structured flowchart of Figure 46 KV RHVC;
The structured flowchart of Figure 51 0KV RHVC;
The structure chart of Figure 66 KV RHVC;
The structure chart of Figure 71 0KV RHVC;
Fig. 8 frequency conversion power unit circuit theory diagrams of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, be example with 6KV and 10KV medium voltage converter speed regulating device, embodiment, structure, feature and effect thereof that foundation the utility model is provided, describe in detail as after.
See Fig. 1, this device adopts the QF primary cut-out directly to insert high pressure, exports by this device HYVERT-HV high pressure.
See Fig. 2,6KV medium voltage converter speed regulating device whenever adopt 2 medium voltage converter power unit cascade five Level Technology mutually, and converter plant is formed by 6 medium voltage converter power unit cascades, reaches 6600V high pressure output purpose after the stack.
See Fig. 3,10KV medium voltage converter speed regulating device whenever adopt 3 medium voltage converter power unit cascade seven Level Technology mutually, and converter plant is formed by 9 medium voltage converter power unit cascades, reaches the purpose of 10KV high pressure output after the stack.
See Fig. 4, in the 6KV medium voltage converter speed regulating device, each medium voltage converter power cell is powered respectively by the secondary coil of the power isolation transformer of input, each frequency conversion power unit rated voltage 1906V, 2 of every phases, therefore phase voltage is 3812V, pairing line voltage is 6600V, one group of secondary coil to the power cell power supply is connected into triangle, another adjacent group secondary coil is connected into star, though the voltage of two windings is identical, and 30 ° of angles of phase phasic difference, low-order harmonic will have phase shift in primary like this, thereby can eliminate low-order harmonic.
See Fig. 5, in the 10KV medium voltage converter speed regulating device, each medium voltage converter power cell is powered respectively by the secondary coil of the power isolation transformer of input, each frequency conversion power unit rated voltage is 1925V, 3 of every phases, therefore phase voltage is 5774V, pairing line voltage is 10000V, one group of secondary coil to the frequency conversion power unit power supply is connected into triangle, another adjacent group secondary coil is connected into star, and the voltage of two windings is identical, 30 ° of angles of phase phasic difference, low-order harmonic will have phase shift in primary like this, thereby can eliminate low-order harmonic.
Narrate the structure of 6KV, 10KV medium voltage converter speed regulating device below.Adopt medium voltage converter power unit cascade superimposing technique, directly import 6KV, 10KV, directly export 6KV, 10KV.
As shown in Figure 6,6KV medium voltage converter speed regulating device are made up of 6 frequency conversion power units, and per 2 frequency conversion power units series connection constitutes a phase, and the three-phase Y-connection is connected with motor, directly gives the power supply of 6KV motor.
As shown in Figure 7,10KV medium voltage converter speed regulating device are made up of 9 frequency conversion power units, and per 3 frequency conversion power units series connection constitutes a phase, and the three-phase Y-connection is connected with motor, directly gives the power supply of 10KV motor.
Controller is made up of high speed digital signal processor DSP (TMS320LF2407A), industrial computer and the PLC that TI company produces.
DSP realizes that 8 16 PWM ripples generate, open loop, closed-loop control, protection and communication function fast.
Industrial computer provides man-machine interface, and PLC finishes the switching value signal logic and handles; Operation, fault interlocking satisfy user's specific (special) requirements simultaneously.Adopt optical fiber communication technology between controller and the frequency conversion power unit, isolate interference problem to solve strong and weak electricity.Therefore, the anti-interference of system and fail safe are high.The control power supply also has been equipped with UPS, in case the power down of control power supply, UPS continues power supply, guarantees the RHVC reliability service.
See Fig. 8, the medium voltage converter power cell---directly---is handed over three phase rectifier/single-phase inversion circuit for handing over.Rectifying part is the high-voltage diode three phase full bridge, carries out the PWM pulse-width modulation by the 1GBT inverter bridge, can obtain single phase alternating current (A.C.) output.
Input side is powered by power isolation transformer.Transformer is paid the limit winding and is divided into many groups.A kind of winding is connected into triangle, and another group winding is connected into star.Centering is pressed the power supply of frequency conversion power unit rectifier bridge respectively, and two groups of secondary coil voltage are identical, but 30 ° of angles of phase phasic difference, low-order harmonic will have phase shift in primary like this, thereby can eliminate low-order harmonic.Because the medium voltage converter power unit cascade can constitute multistage phase-shifting commutation mode, improves the current waveform of grid side preferably, improves the power factor of net side greatly.Pay the independence of limit winding, make the major loop of each medium voltage converter power cell relatively independent, do not have the electric voltage equalization problem, do not have middle dc voltage mid point offset problem, safety, reliable.
Outlet side is composed in series Y-connection mutually by U, the V lead-out terminal of each medium voltage converter power cell, powers to motor.Superpose by the PWM waveform to each medium voltage converter power cell, can get ladder sine pulse width modulation (PWM) waveform, when central pressure frequency conversion power unit breaks down, the trouble unit bypass can be logged off, the converter plant derate is proceeded.
Each medium voltage converter power cell is identical on structure and electric property, can exchange.Each medium voltage converter power cell all constitutes the frequency converter of the PWM pulse-width modulation of three-phase input, single-phase output, and its output voltage is+V
DC, 0 ,-V
DC
Relation such as following table between H bridge switch function, on off state and the output voltage.
| Switch function H K | S 1 | S 1 | V OK |
| 1 | 1 | 1 | +V DC |
| 0 | 1 | 0 | 0 |
| 0 | 1 | 0 | |
| -1 | 0 | 0 | -V DC |
Annotate: S
1, S
4=1 expression power switch S
1, S
4Open-minded.
S
1, S
4=0 expression power switch S
1, S
4Turn-off.+ V
DCDC bus-bar voltage for bridge.
Claims (3)
1. the medium voltage converter speed regulating device of blower fan and water pump special use, comprise frequency conversion power unit, power isolation transformer, controller, it is characterized in that: this device is made up of a plurality of H bridge medium voltage converter power cell stacks, press H bridging frequency power unit cascade to constitute a phase in a plurality of, the three-phase Y-connection is connected with motor; Described frequency conversion power unit is for handing over-straight-friendship three phase rectifier/single-phase inversion circuit, the rectification side is the high-voltage diode three phase full bridge, carry out the PWM pulse-width modulation by the IGBT inverter bridge, the output of acquisition single phase alternating current (A.C.), outlet side is composed in series Y-connection mutually by the lead-out terminal of each frequency conversion power unit, powers to motor; The secondary winding of power isolation transformer is divided into many groups, and a kind of winding is connected into triangle, and another kind of winding is connected into star, respectively the rectifier bridge of frequency conversion power unit is powered; Controller is made up of high speed digital signal processor DSP, industrial computer and PLC programmable controller, adopts optical fiber communication technology between controller and the frequency conversion power unit.
2. the medium voltage converter speed regulating device of blower fan according to claim 1 and water pump special use, it is characterized in that: 6KV medium voltage converter speed regulating device press the power cell stack frequently of H bridging to form in 6, per 2 frequency conversion power units series connection constitutes a phase, and the three-phase Y-connection is connected with the 6KV motor.
3. the medium voltage converter speed regulating device of blower fan according to claim 1 and water pump special use, it is characterized in that: 10KV medium voltage converter speed regulating device press the power cell stack frequently of H bridging to form in 9, per 3 frequency conversion power units series connection constitutes a phase, the three-phase Y-connection is connected with the 10KV motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2006201517779U CN201041997Y (en) | 2006-12-15 | 2006-12-15 | Middle voltage frequency conversion speed-adjustable device for wind blower and water pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2006201517779U CN201041997Y (en) | 2006-12-15 | 2006-12-15 | Middle voltage frequency conversion speed-adjustable device for wind blower and water pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201041997Y true CN201041997Y (en) | 2008-03-26 |
Family
ID=39253708
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2006201517779U Expired - Lifetime CN201041997Y (en) | 2006-12-15 | 2006-12-15 | Middle voltage frequency conversion speed-adjustable device for wind blower and water pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201041997Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104197554A (en) * | 2014-09-12 | 2014-12-10 | 浙江鸿乐光热科技有限公司 | Water-tank jacket medium forced circulation system of balcony wall-mounted solar water heater |
| CN106059262A (en) * | 2016-07-05 | 2016-10-26 | 沈阳远大电力电子科技有限公司 | High-reliability high-voltage frequency converter |
| CN110635666A (en) * | 2018-06-20 | 2019-12-31 | Abb瑞士股份有限公司 | Frequency converter and method relating to a frequency converter |
| CN112152425A (en) * | 2020-08-13 | 2020-12-29 | 山东源拓电气有限公司 | Five-level variable frequency driving device special for electric submersible pump |
-
2006
- 2006-12-15 CN CNU2006201517779U patent/CN201041997Y/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104197554A (en) * | 2014-09-12 | 2014-12-10 | 浙江鸿乐光热科技有限公司 | Water-tank jacket medium forced circulation system of balcony wall-mounted solar water heater |
| CN106059262A (en) * | 2016-07-05 | 2016-10-26 | 沈阳远大电力电子科技有限公司 | High-reliability high-voltage frequency converter |
| CN110635666A (en) * | 2018-06-20 | 2019-12-31 | Abb瑞士股份有限公司 | Frequency converter and method relating to a frequency converter |
| CN110635666B (en) * | 2018-06-20 | 2022-03-29 | Abb瑞士股份有限公司 | Frequency converter and method relating to a frequency converter |
| CN112152425A (en) * | 2020-08-13 | 2020-12-29 | 山东源拓电气有限公司 | Five-level variable frequency driving device special for electric submersible pump |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20080326 |
|
| EXPY | Termination of patent right or utility model |