CN208589938U - A kind of split type main loop unit structure of nine phases electric machine speed regulation frequency converter - Google Patents
A kind of split type main loop unit structure of nine phases electric machine speed regulation frequency converter Download PDFInfo
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- CN208589938U CN208589938U CN201820974109.9U CN201820974109U CN208589938U CN 208589938 U CN208589938 U CN 208589938U CN 201820974109 U CN201820974109 U CN 201820974109U CN 208589938 U CN208589938 U CN 208589938U
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Abstract
The utility model provides a kind of split type main loop unit structure of nine phase electric machine speed regulation frequency converters, including by power supply side to the sequentially connected power circuit breaker QF0 of motor output end, transformer B1 and split type converter unit, the split type converter unit is made of three groups of independent two level frequency-conversions unit VFD1, VFD2, VFD3 parallel connections, every group of two level frequency-conversion units are provided with input terminal contactor and output end contactor, also, every group two level frequency-conversion unit VFD1, VFD2, VFD3 are also parallel with by-pass switch.The structure of converter unit major loop is three independent units, and is both provided with respective failure bypass, when wherein one or two failure, can individually be bypassed, and entire frequency converter can also drop load and operate normally, and does not have to shut down.
Description
Technical field
The utility model relates to frequency conversion control technique fields, in particular to nine phase electric machine speed regulation frequency converters of one kind is split type
Main loop unit structure.
Background technique
Limited by electric system, the number of phases of motor is typically not greater than three-phase, the development of power electronic devices and technology so that
Multiphase power converter part is possibly realized, so that the number of phases of motor also breaches this limitation.Since power of motor is proportional to phase
Several and phase voltage, the product of electric current, polyphase machine can preferably realize the high-power transmission of low-voltage device, be suitable for power supply electricity
The limited occasion of pressure.It can adapt to the stress levels of device for power switching by transformation electric machine structure.In addition, polyphase machine
Also have the advantage that the amplitude of torque pulsation reduces, the frequency of pulsation increases；High reliability, one group of polyphase machine or
The influence started and run to drive system of breaking down of several groups of stator winding is relatively small.
Polyphase machine speed-regulating system has multiphase redundancy knot other than it can realize high-power grade with low voltage power devices
Structure makes the reliability of speed-regulating system be improved.In the process of running, as long as thering is one to break down in numerous power devices,
General frequency conversion speed-adjusting system will be unable to work normally and shut down.But multiphase frequency converter is in one or several device failures, as long as will
It is corresponding mutually to cut off, load level is suitably reduced, can still be operated normally.
Summary of the invention
In order to solve the problems, such as described in background technique, the utility model provides a kind of fission of nine phase electric machine speed regulation frequency converters
The structure of formula main loop unit structure, converter unit major loop is three independent units, and is both provided with respective failure
Bypass, when wherein one or two failure, can individually bypass, and entire frequency converter can also drop load and operate normally, and not have to
It shuts down.
In order to achieve the above object, the utility model is implemented with the following technical solutions:
A kind of split type main loop unit structure of nine phases electric machine speed regulation frequency converter, including it is defeated to motor by power supply side
The sequentially connected power circuit breaker QF0 of outlet, transformer B1 and split type converter unit, which is characterized in that described is split type
Converter unit is made of three groups of independent two level frequency-conversions unit VFD1, VFD2, VFD3 parallel connections, and every group of two level frequency-conversion units are equal
It is provided with input terminal contactor and output end contactor, also, every group of two level frequency-conversion units are also parallel with by-pass switch.Its
In:
Two level frequency-conversion unit VFD1 are provided with input terminal contactor KM1, output end contactor KM4, are parallel with bypass and open
Close QF1；Two level frequency-conversion unit VFD2 are provided with input terminal contactor KM2, output end contactor KM5, are parallel with by-pass switch
QF2；Two level frequency-conversion unit VFD3 are provided with input terminal contactor KM3, output end contactor KM6, are parallel with by-pass switch
QF3。
The front and back ends of two described level frequency-conversion unit VFD1, VFD2, the VFD3 respectively with input terminal contactor and output end
Contactor series connection and then it is in parallel with by-pass switch.
The transformer B1 is the phase shift transformation that primary side inputs three phase mains, secondary side exports three groups of three-phase voltages
Device, respectively three group of two level frequency-conversion unit VFD1, VFD2, VFD3 power supply.
Compared with prior art, the utility model has the beneficial effects that
The utility model provides a kind of split type main loop unit structure of nine phase electric machine speed regulation frequency converters, converter unit master
The structure in circuit is three independent units, and is both provided with respective failure bypass, when wherein one or two failure,
It can individually bypass, entire frequency converter can also drop load and operate normally, and not have to shut down.
Detailed description of the invention
Fig. 1 is the split type main loop unit electrical structure diagram of the nine phase electric machine speed regulation frequency converter of one kind of the utility model；
Fig. 2 is that the major loop of two level frequency-conversions unit VFD in the prior art provided by the embodiment of the utility model is electrical
Structure chart；
Fig. 3 is the specific example figure of transformer B1 provided by the embodiment of the utility model；
Fig. 4 is the output phase angle figure of transformer B1 provided by the embodiment of the utility model.
Specific embodiment
Specific embodiment provided by the utility model is described in detail below in conjunction with attached drawing.
As shown in Figure 1, a kind of split type main loop unit structure of nine phase electric machine speed regulation frequency converters, including by power supply power supply
It holds to the sequentially connected power circuit breaker QF0 of motor output end, transformer B1 and split type converter unit, the split type change
Frequency unit is made of three groups of independent two level frequency-conversions unit VFD1, VFD2, VFD3 parallel connections, every group of two level frequency-conversion units
VFD1, VFD2, VFD3 are provided with input terminal contactor KM1, KM2, KM3 and output end contactor KM4, KM5, KM6, also,
Every group two level frequency-conversion unit VFD1, VFD2, VFD3 are also parallel with by-pass switch QF1, QF2 and QF3.
Two level frequency-conversion unit VFD1 are provided with input terminal contactor KM1, output end contactor KM4, are parallel with bypass and open
Close QF1；Two level frequency-conversion unit VFD2 are provided with input terminal contactor KM2, output end contactor KM5, are parallel with by-pass switch
QF2；Two level frequency-conversion unit VFD3 are provided with input terminal contactor KM3, output end contactor KM6, are parallel with by-pass switch
QF3。
The front and back ends of two described level frequency-conversion unit VFD1, VFD2, the VFD3 respectively with input terminal contactor KM1, KM2,
KM3 and output end contactor KM4, KM5, KM6 series connection and then it is in parallel with by-pass switch QF1, QF2 and QF3.
In Fig. 1, QF0 is that system power supply inputs breaker, and R0 and KM0 composition input transformer powers on charging current limiter electricity
Road carries out Surge suppression.KM1~KM6 is the input and output contactor of frequency converter VFD1~VFD3.QF1~QF3 is frequency converter
The bypass changeover of VFD1~VFD3 switchs.By taking VFD1 as an example, KM1 and KM2 and QF1 are interlocked, when KM1 and KM2 has a closure,
QF1 cannot be closed；Equally, when QF1 is closed, KM1 and KM2 cannot be closed.So that the same time, which only has power frequency or change
Frequently a kind of power supply is in power supply state.VFD2 and VFD3 logical interlock is similarly.
As shown in Fig. 2, being the major loop structure exemplary diagram of two described level frequency-conversion unit VFD1, VFD2, the VFD3, this figure
For two level frequency-conversions structure chart commonly used in the prior art, including rectifying part 1, DC terminal 2 and Converting Unit 3, rectifying part 1
For diode full-bridge rectification, 2 capacitor of DC terminal, Converting Unit is IGBT inversion unit, the control of two level PWMs.It is conventional two electricity
The structure of flat frequency converter.
The transformer B1 is the phase shift transformation that primary side inputs three phase mains, secondary side exports three groups of three-phase voltages
Device, input terminal 10KV, output end 1270V, three groups of phase shift angle are respectively as follows: 40 °, 0 °, 80 °, and respectively three group of two level becomes
Frequency unit VFD1, VFD2, VFD3 power supply.The specific structure example of transformer B1 is shown in Fig. 3, three groups of three-phase voltages of transformer B1
Phase angle schematic diagram is shown in Fig. 4.Transformer in the present embodiment is using the secondary side Z-type mode of connection, main winding 4 and Phase shift winding 5
The number of turns be arranged according to phase shift angle.
Above embodiments are implemented under premised on technical solutions of the utility model, give detailed embodiment
With specific operating process, but the protection scope of the utility model is not limited to the above embodiments.Side used in above-described embodiment
Method is conventional method unless otherwise instructed.
Claims (3)
1. a kind of split type main loop unit structure of nine phase electric machine speed regulation frequency converters, including exported by power supply side to motor
Hold sequentially connected power circuit breaker QF0, transformer B1 and split type converter unit, which is characterized in that the split type change
Frequency unit is made of three groups of independent two level frequency-conversions unit VFD1, VFD2, VFD3 parallel connections, and every group of two level frequency-conversion units are all provided with
It is equipped with input terminal contactor and output end contactor, also, every group of two level frequency-conversion units are also parallel with by-pass switch；Its
In:
Two level frequency-conversion unit VFD1 are provided with input terminal contactor KM1, output end contactor KM4, are parallel with by-pass switch
QF1；
Two level frequency-conversion unit VFD2 are provided with input terminal contactor KM2, output end contactor KM5, are parallel with by-pass switch
QF2；
Two level frequency-conversion unit VFD3 are provided with input terminal contactor KM3, output end contactor KM6, are parallel with by-pass switch
QF3。
2. a kind of split type main loop unit structure of nine phases electric machine speed regulation frequency converter according to claim 1, feature
It is, the front and back ends of two described level frequency-conversion unit VFD1, VFD2, the VFD3 are terminated with input terminal contactor and output respectively
Tentaculum series connection and then it is in parallel with by-pass switch.
3. a kind of split type main loop unit structure of nine phases electric machine speed regulation frequency converter according to claim 1, feature
It is, the transformer B1 is the phase-shifting transformer that primary side inputs three phase mains, secondary side exports three groups of three-phase voltages, is
Three group of two level frequency-conversion unit VFD1, VFD2, VFD3 power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820974109.9U CN208589938U (en) | 2018-06-22 | 2018-06-22 | A kind of split type main loop unit structure of nine phases electric machine speed regulation frequency converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820974109.9U CN208589938U (en) | 2018-06-22 | 2018-06-22 | A kind of split type main loop unit structure of nine phases electric machine speed regulation frequency converter |
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| Publication Number | Publication Date |
|---|---|
| CN208589938U true CN208589938U (en) | 2019-03-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820974109.9U Active CN208589938U (en) | 2018-06-22 | 2018-06-22 | A kind of split type main loop unit structure of nine phases electric machine speed regulation frequency converter |
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| Country | Link |
|---|---|
| CN (1) | CN208589938U (en) |
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2018
- 2018-06-22 CN CN201820974109.9U patent/CN208589938U/en active Active
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20190605 Address after: No. 272 Sifangtai Road, Tiexi District, Anshan City, Liaoning Province, 114000 Co-patentee after: WOLONG ELECTRIC NANYANG EXPLOSION PROTECTION GROUP CO., LTD. Patentee after: Wolong electric group Liaoning Rongxin electric drive Co., Ltd. Co-patentee after: Wolong Electric Group Co., Ltd. Address before: No. 108 Science and Technology Road, Tiedong District, Anshan City, Liaoning Province, 114000 Co-patentee before: WOLONG ELECTRIC NANYANG EXPLOSION PROTECTION GROUP CO., LTD. Patentee before: Wolong electric group Liaoning Rongxin hi tech Electric Co., Ltd. Co-patentee before: Wolong Electric Group Co., Ltd. |
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| TR01 | Transfer of patent right |