CN209627231U - A kind of high-voltage frequency converter braking circuit topological structure - Google Patents
A kind of high-voltage frequency converter braking circuit topological structure Download PDFInfo
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- CN209627231U CN209627231U CN201920768313.XU CN201920768313U CN209627231U CN 209627231 U CN209627231 U CN 209627231U CN 201920768313 U CN201920768313 U CN 201920768313U CN 209627231 U CN209627231 U CN 209627231U
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Abstract
The utility model is a kind of high-voltage frequency converter braking circuit topological structure, it is characterized by: the high-voltage frequency converter is cascade of power units formula three-phase high-voltage frequency converter, include input multiwinding transformer and power unit assembly, power unit assembly includes not have the I type power cell for inhibiting DC bus-bar voltage pump to rise function and with the II type power cell for inhibiting DC bus-bar voltage pump to rise function, it is divided into 3 groups, every group includes at least two power cells, and wherein at least one is II type power cell, every group of power cell passes through its AC output terminal T1, T2 is sequentially connected in series, output end of the circuit on one side as high-voltage frequency converter after series connection, central node NP as the high-voltage frequency converter after the other end then links together 3 groups, using DC link copped wave dynamic braking mode or using active Rectifier system realizes braking.Tthe utility model system structure is simple, at low cost, suitable for only needing the application of smaller braking power.
Description
Technical field
The utility model relates to a kind of high-voltage frequency converter braking circuit topological structures, especially disclose a kind of power cell grade
The braking topology of connection type high voltage frequency convertor, is applied to motor frequency conversion drive area.
Background technique
Currently, domestic high-voltage frequency converter is based on cascade of power units formula topology, using the high-pressure frequency-conversion of such topology
The advantages that device has power cell structure simple, and input and output harmonic wave is small, and high voltage easy to accomplish exports.Power cell is that this is opened up
The core component of high-voltage frequency converter is flutterred, generally there are 3 kinds of basic patterns: 1) diode rectification+H bridge inversion；2) diode rectification+straight
Flow copped wave braking+H bridge inversion；3) active rectification+H bridge inversion with energy feedback function.Wherein pattern 1) power cell knot
Structure is simple, and cost is relatively low, but does not have the function of inhibiting DC bus-bar voltage pump to rise, and is known as I type power in the utility model
Unit；Pattern 2) and power cell 3) have the function of that DC bus-bar voltage pump is inhibited to rise, but structure is compared with I type power cell
Complexity, and cost is also higher, and II type power cell is known as in the utility model.
In current existing product or document, the core control system of unit cascade high-voltage frequency converter is to each power list
Member takes identical control strategy, the braking power basic one for causing single each power cell covered in high-voltage frequency converter to absorb
It causes, when motor is run as generator, each power cell is required to absorb braking energy, is also just required to inhibit direct current female
The function that line voltage pump rises, therefore it is mixed with II type power cell to cannot achieve I type power cell, causes in certain applications
It is not achieved and distributes rationally.Such as the occasion of fast braking is needed in motor, it is common practice to which each power cell is all made of II
Type power cell causes unit and complete machine structure complicated, with high costs.Also there is portioned product in order to simplify frequency changer, adopt
With pattern 2 in II type power cell) power cell, then by each DC chopped-wave brake or in which braking resistor concentrate
It is configured in individual brake cabinet, but needs to draw the DC terminal of each unit, number of cables is numerous, and needs to handle well
Insulation Problems between every group of brake assemblies cause brake cabinet design complicated, and cost is also high.In certain applications, and it is not required to
Braking power that will be very big, if braking power only needs the application of rated power 5% ~ 30%, still to use above-mentioned tradition side
Case causes frequency changer complicated, with high costs.
Summary of the invention
The purpose of the utility model is to overcome problems of the prior art, disclose a kind of high-voltage frequency converter braking electricity
Road topological structure is suitable for cascade of power units formula high-voltage frequency converter.In the application for not needing total power braking, Dan Taobian
It is mixed with II type power cell that frequency device may be implemented I type power cell, i.e., unit uses I type power cell, unit
Using II type power cell.Using pattern 2 in II type power cell) power cell when, copped wave brake can be concentrated
Arrangement, so that machine system structure is simple, it is at low cost.
The utility model is realized in this way: a kind of high-voltage frequency converter braking circuit topological structure, it is characterised in that: described
High-voltage frequency converter is cascade of power units formula three-phase high-voltage frequency converter, comprising inputting multiwinding transformer and power unit assembly,
The power unit assembly includes n power cell, and wherein n is natural number, and n >=6.Include in the n power cell
There is m II type power cell, remaining is I type power cell, and wherein m is natural number, and n > m >=3.The I type power cell
For without the power cell for inhibiting DC bus-bar voltage pump to rise function, the II type power cell is female with inhibition direct current
Line voltage pump rises the power cell of function, each AC input terminal, respectively R, S, T there are three the power cells, and two
A AC output terminal, respectively the first AC output terminal T1, the second AC output terminal T2, the input Multiple coil become
Depressor is three-phase multiwinding transformer, and input terminal of the primary side of the multiwinding transformer as the high-voltage frequency converter is described
Multiwinding transformer is equipped with the n vice-side windings to connect one to one respectively with the ac input end of the n power cell,
The n power cell is divided into 3 groups, and every group includes at least two power cells, and wherein at least one is II type power
Unit, every group of power cell are sequentially connected in series by respective first AC output terminal T1, the second AC output terminal T2,
Output end of the circuit on one side as high-voltage frequency converter after series connection, and the other end after 3 groups of power unit cascade connections is then
It links together, the central node NP as the high-voltage frequency converter.The voltage class of the high-voltage frequency converter is 3 ~ 35kV.
I type power cell in the power cell includes the diode D6 of first diode D1 ~ the 6th, the first DC energy storage
Capacitor C1 and the first full-control type power electronic switch full-control type power electronic of S1 ~ the 4th switch S4, the first diode D1 and
4th diode D4, third diode D3 and the 6th diode D6, the 5th diode D5 and the second diode D2 company of series connection respectively
It is connected in parallel again after connecing, the first diode D1 and the 4th diode D4, third diode D3 and the 6th diode D6, the 5th
AC input terminal R, S, T put as the I type power cell that diode D5 and the second diode D2 is connected in series, it is described
First diode D1 and the 4th diode D4, third diode D3 and the 6th diode D6, the 5th diode D5 and the two or two pole
The both ends that pipe D2 is connected in parallel after being connected in series form three-phase respectively as DC bus DC+, DC- of the I type power cell
Full-bridge uncontrollable rectifier structure, the first DC energy storage capacitor C1 be connected to the I type power cell DC bus DC+,
DC-, the first full-control type power electronic switch S1 and the second full-control type power electronic switch S2, third full-control type power electronic
Switch S3 and the 4th full-control type power electronic switch S4 are connected in series respectively, and the point of series connection is respectively as the I type power
First AC output terminal T1 of unit and the second AC output terminal T2, the first full-control type power electronic switch S1 and
Two full-control type power electronic switch S2, third full-control type power electronic switch S3 and the 4th full-control type power electronic switch S4 series connection
Both ends after connection are respectively connected to DC bus DC+, DC- of the I type power cell, form single-phase H bridge inverter structure.Institute
The also settable by-pass switch K1 of the I type power cell stated, the both ends of the by-pass switch K1 respectively with the I type power cell
First AC output terminal T1 and the second AC output terminal T2 connection form the I type power cell for having auto by pass function,
To improve the reliability of system.
II type power cell in the power cell includes the 11st diode D11 ~ the 17th diode D17, and second
DC energy storage capacitor C2, braking resistor R1 and the 5th full-control type power electronic switch full-control type power electronic switch S9 of S5 ~ the 9th,
The 11st diode D11 and the 14th diode D14, the 13rd diode D13 and the 16th diode D16, the 15th
Diode D15 and the 12nd diode D12 is connected in parallel again after being connected in series respectively, the 11st diode D11 and the tenth
Four diode D14, the 13rd diode D13 and the 16th diode D16, the 15th diode D15 and the 12nd diode D12
The point of series connection AC input terminal R, S, T as the II type power cell, the 11st diode D11 and the tenth
Four diode D14, the 13rd diode D13 and the 16th diode D16, the 15th diode D15 and the 12nd diode D12
It is complete to form three-phase respectively as DC bus DC+, DC- of the II type power cell for the both ends being connected in parallel after series connection
Bridge uncontrollable rectifier structure, the second DC energy storage capacitor C2 are connected to DC bus DC+, DC- of the II type power cell,
The 5th full-control type power electronic switch S5 and the 6th full-control type power electronic switch S6, the 7th full-control type power electronic switch
S7 and eight convergent points control type power electronic switch S8 are connected in series respectively, and the point of series connection is respectively as the II type power cell
The first AC output terminal T1 and the second AC output terminal T2, the 5th full-control type power electronic switch S5 and the 6th it is complete
Control type power electronic switch S6, the 7th full-control type power electronic switch S7 and eight convergent points control type power electronic switch S8 are connected in series
Both ends afterwards are respectively connected to DC bus DC+, DC- of the II type power cell, form single-phase H bridge inverter structure, described
Braking resistor R1 and the 17th diode D17 is connected in series after being connected in parallel with the 9th full-control type power electronic switch S9,
Wherein one end after series connection is connected to DC bus DC+, and the other end is connected to DC bus DC-, forms DC chopped-wave system
Dynamic structure.
It includes input filter device assembly Filter, the 11st full-control type electric power electricity that the II type power cell, which can also use,
The full-control type power electronic switch S16 of sub switch S11 ~ the 16th, third DC energy storage capacitor C3 and the 31st full-control type electric power
The component of the full-control type power electronic switch of electronic switch S31 ~ the 34th S34 connects composition, the 11st full-control type electricity
Power electronic switch S11 and the 14th full-control type power electronic switch S14, the 13rd full-control type power electronic switch S13 and the tenth
Six full-control type power electronic switch S16, the 15th full-control type power electronic switch S15 and the 12nd full-control type power electronic switch
S12 is connected in parallel again after being connected in series respectively, the 11st full-control type power electronic switch S11 and the 14th full-control type electric power
Electronic switch S14, the 13rd full-control type power electronic switch S13 and the 16th full-control type power electronic switch S16, the 15th is complete
The point that control type power electronic switch S15 and the 12nd full-control type power electronic switch S12 is connected in series is connected to input filter
The output end of component Filter, exchange of the input terminal of the input filter device assembly Filter as the II type power cell
Input terminal R, S, T, the 11st full-control type power electronic switch S11 and the 14th full-control type power electronic switch S14,
13 full-control type power electronic switch S13 and the 16th full-control type power electronic switch S16, the 15th full-control type power electronic are opened
The both ends being connected in parallel after S15 and the 12nd full-control type power electronic switch S12 is connected in series are closed respectively as the II type function
DC bus DC+, DC- of rate unit, form three-phase active rectifier structure, and the third DC energy storage capacitor C3 is connected to described
DC bus DC+, DC- of II type power cell, the 31st full-control type power electronic switch S31 and the 32nd control entirely
Type electronic power switch S32, the 33rd full-control type power electronic switch S33 and the 34th full-control type power electronic switch
S34 is connected in series respectively, and the point of series connection is respectively as the first AC output terminal T1 of the II type power cell and
Two AC output terminal T2, the 31st full-control type power electronic switch S31 and the 32nd full-control type power electronic are opened
After closing S32, the 33rd full-control type power electronic switch S33 and the 34th full-control type power electronic switch S34 series connection
Both ends be respectively connected to DC bus DC+, DC- of the II type power cell, form single-phase H bridge inverter structure.
The II type power cell of above two different structure can also form by the way that by-pass switch K1 is arranged and have auto by pass
The II type power cell of function, to improve the reliability of system.The both ends of the by-pass switch K1 respectively with the II type power
First AC output terminal T1 of unit and the second AC output terminal T2 connection.Meanwhile the power list for needing to guarantee to be divided into 3 groups
The II type power cell that at least one in every group of member does not bypass, when ensuring that motor is run as generator, the braking of the group
Power is effectively absorbed, and system can work normally.
The power cell quantity optimal case that power unit assembly described in the utility model includes is the multiple of selection 3, and
It is equally divided into 3 groups of carry out tandem type connections.
The beneficial effects of the utility model are:
1) in certain applications, do not need very big braking power, as braking power be only rated power 5% ~
30% application, it is single to cover frequency converter to may be implemented I type power cell mixed with II type power cell, it need to be by Partial Power
Unit configuration copped wave brake or Partial Power unit are configured to the power cell with energy feedback, can simplify frequency converter complete machine
Structure, and reduce cost.
2) using Partial Power unit configuration copped wave brake scheme when, can by copped wave brake centralized arrangement, and
The power cell of configuration copped wave brake can choose as by the power cell of pericenter, so that copped wave brake is electric over the ground
Press it is lower, can simplify concentrate brake insulating Design, be further simplified complete machine structure and reduce system cost.
Detailed description of the invention
Fig. 1 is the frame structure schematic diagram of the utility model.
Fig. 2 is the block diagram of power cell in the utility model.
Fig. 3 is the structural schematic diagram of the embodiment 1 of I type power cell in the utility model.
Fig. 4 is the structural schematic diagram of the embodiment 2 of I type power cell in the utility model.
Fig. 5 is the structural schematic diagram of the embodiment 1 of II type power cell in the utility model.
Fig. 6 is the structural schematic diagram of the embodiment 2 of II type power cell in the utility model.
Fig. 7 is the structural schematic diagram of the embodiment 3 of II type power cell in the utility model.
Fig. 8 is the structural schematic diagram of the embodiment 4 of II type power cell in the utility model.
Specific embodiment
The utility model is described in further detail in the following with reference to the drawings and specific embodiments.
With reference to the accompanying drawings 1 ~ 2, the utility model is a kind of high-voltage frequency converter braking circuit topological structure, the high-voltage frequency converter
For cascade of power units formula three-phase high-voltage frequency converter, include input multiwinding transformer and power unit assembly, the power list
First component includes n power cell, and wherein n is natural number, and n >=6.It include m II type function in the n power cell
Rate unit PU2, remaining is I type power cell PU1, and wherein m is natural number, and n > m >=3.The I type power cell is not
With the power cell for inhibiting DC bus-bar voltage pump to rise function, the II type power cell is with inhibition DC bus electricity
Press pump rises the power cell of function, and there are three AC input terminal, respectively R, S, T, two friendships for each power cell
Flow output terminal, respectively the first AC output terminal T1, the second AC output terminal T2, the input multiwinding transformer
For three-phase multiwinding transformer, input terminal (A, B, C) of the primary side of the multiwinding transformer as the high-voltage frequency converter, institute
State secondary side that multiwinding transformer is connected one to one respectively equipped with the ac input end of n and the n power cell around
Group, the n power cell are divided into 3 groups, and every group includes at least two power cells, and wherein at least one is II type function
Rate unit, every group of power cell are sequentially connected in series company by respective first AC output terminal T1, the second AC output terminal T2
It connects, output end (W, V, U) of the circuit on one side after series connection as high-voltage frequency converter, and after 3 groups of power unit cascade connections
The other end then link together, the central node NP as the high-voltage frequency converter.The voltage class of the high-voltage frequency converter
For 3 ~ 35kV.
The high-voltage frequency converter driving motor operation, when motor operation is when first quartile and third quadrant, motor will be electric
Mechanical energy can be converted to, that is, is used as motor running.Under such operating condition, I type power cell and II type power cell are not
The problem of needing to absorb braking power, rising there is no DC bus-bar voltage pump, each unit takes identical control strategy, and 3 groups
The current phasor of every group of power cell is identical in power cell, and voltage vector is also identical, i.e., the active power of each power cell
It is almost the same with reactive power.When motor operation is when the second quadrant and fourth quadrant, motor converts mechanical energy into electric energy, i.e.,
Motor is run as generator, and when motor fast braking typically belongs to such operating condition.Under such operating condition, I type function
Rate unit and II type power cell need to take different control strategies, the electric current arrow of every group of power cell in 3 groups of power cells
Measure identical, but the voltage vector of I type power cell and II type power cell is different in every group, the voltage arrow of I type power cell
Measuring the angle between current phasor is 90 ° or close to 90 °, the active power very little of I type power cell or entirely idle function
To prevent busbar voltage from increasing over-voltage fault occurs for rate；Angle between the voltage vector and current phasor of II type power cell
For 180 ° or close to 180 °, braking power is mainly absorbed by II type power cell, and the braking power of absorption is disappeared by braking resistor
It consumes or power grid is fed back to by active rectification.
Preferably, the power cell quantity that the power unit assembly includes is 3 multiple, and is equally divided into 3 groups of progress
Tandem type connection.But under certain operating conditions, power cell quantity can not also be 3 multiple, i.e., of every group power cell
Number is different.Such as there is individual power unit to break down, in the case where no standby power units, for quick recovery system
Operation, this power cell can be removed, and use cable or the first AC output terminal T1 and the of copper bar connection adjacent cells
Two AC output terminal T2, so that this group of power cell number is different from other two groups, control system is deviated by central point and is calculated
Method still can be with normal driving motor operation in frequency converter output voltage limit of power.
With reference to the accompanying drawings 3, the structural schematic diagram of the embodiment 1 of I type power cell in the utility model.
The I type power cell includes the diode D6 of first diode D1 ~ the 6th, the first DC energy storage capacitor C1 and first
The full-control type power electronic switch full-control type power electronic of S1 ~ the 4th switch S4, the first diode D1 and the 4th diode D4,
Third diode D3 and the 6th diode D6, the 5th diode D5 and the second diode D2 are in parallel again after being connected in series respectively to be connected
It connects, the first diode D1 and the 4th diode D4, third diode D3 and the 6th diode D6, the 5th diode D5 and
The point that two diode D2 are connected in series AC input terminal R, S, T as the I type power cell, the first diode D1
With the 4th diode D4, third diode D3 and the 6th diode D6, the 5th diode D5 and the second diode D2 are connected in series
The both ends being connected in parallel afterwards form three phase full bridge uncontrollable rectifier respectively as DC bus DC+, DC- of the I type power cell
Structure, the first DC energy storage capacitor C1 are connected to DC bus DC+, DC- of the I type power cell, and described first is complete
Control type power electronic switch S1 and the second full-control type power electronic switch S2, third full-control type power electronic switch S3 and the 4th are complete
Control type power electronic switch S4 is connected in series respectively, and the point of series connection is exchanged respectively as the first of the I type power cell
Output terminal T1 and the second AC output terminal T2, the first full-control type power electronic switch S1 and the second full-control type electric power electricity
Sub switch S2, the both ends after third full-control type power electronic switch S3 and the 4th full-control type power electronic switch S4 are connected in series are divided
It is not connected to DC bus DC+, DC- of the I type power cell, forms single-phase H bridge inverter structure.
With reference to the accompanying drawings 4, the structural schematic diagram of the embodiment 2 of I type power cell in the utility model.
The I type power cell is additionally provided with side in the structure basis of attached I type power cell embodiment 1 shown in Fig. 3
Way switch K1, the both ends of the by-pass switch K1 respectively with the first AC output terminal T1 of the I type power cell and second
AC output terminal T2 connection forms the I type power cell for having auto by pass function, to improve the reliability of system.It is described
By-pass switch K1 is the electronic switches such as mechanical switch or electric semiconductor such as contactor.When the power cell operates normally, institute
By-pass switch K1 is stated to be in an off state；When the power cell fault, the by-pass switch K1 is closed automatically, by the power
Unit bypass, frequency convertor system deviate scheduling algorithm by central point, can drive electricity in the range of output voltage capability allows
Machine continues to run.
With reference to the accompanying drawings 5, the structural schematic diagram of II type power cell embodiment 1 in the utility model.
The II type power cell includes the 11st diode D17 of diode D11 ~ the 17th, the second DC energy storage capacitor
C2, braking resistor R1, the 5th full-control type power electronic switch S5 ~ the 9th full-control type power electronic switch S9, the described 11st
Pole pipe D11 and the 14th diode D14, the 13rd diode D13 and the 16th diode D16, the 15th diode D15 and
12 diode D12 are connected in parallel again after being connected in series respectively, the 11st diode D11 and the 14th diode D14, the
The point that 13 diode D13 and the 16th diode D16, the 15th diode D15 and the 12nd diode D12 are connected in series is made
For AC input terminal R, S, T of the II type power cell, the 11st diode D11 and the 14th diode D14,
13 diode D13 and the 16th diode D16, the 15th diode D15 and the 12nd diode D12 are in parallel after being connected in series
The both ends of connection form three phase full bridge uncontrollable rectifier structure respectively as DC bus DC+, DC- of the II type power cell,
The second DC energy storage capacitor C2 is connected to DC bus DC+, DC- of the II type power cell, the 5th full-control type
Electronic power switch S5 and the 6th full-control type power electronic switch S6, the 7th full-control type power electronic switch S7 and the 8th full-control type
Electronic power switch S8 is connected in series respectively, and the point of series connection is exported respectively as the first exchange of the II type power cell
Terminal T1 and the second AC output terminal T2, the 5th full-control type power electronic switch S5 and the 6th full-control type power electronic are opened
The both ends after S6, the 7th full-control type power electronic switch S7 and eight convergent points control type power electronic switch S8 are connected in series are closed to connect respectively
It is connected to DC bus DC+, DC- of the II type power cell, forms single-phase H bridge inverter structure, the braking resistor R1 and
17 diode D17 be connected in parallel after with the 9th full-control type power electronic switch S9 series connection, its after series connection
Middle one end is connected to DC bus DC+, and the other end is connected to DC bus DC-, forms DC chopped-wave brake structure.
When the II type power cell absorbs braking power, the braking power is consumed by the braking resistor R1
Fall, realizes the function of inhibiting busbar voltage pump to rise.
With reference to the accompanying drawings 6, the structural schematic diagram of II type power cell embodiment 2 in the utility model.
The II type power cell is additionally provided with side in the structure basis of II type power cell embodiment 1 shown in attached drawing 5
Way switch K1, the both ends of the by-pass switch K1 respectively with the first AC output terminal T1 of the II type power cell and second
AC output terminal T2 connection forms the II type power cell for having auto by pass function, to improve the reliability of system.It is described
By-pass switch K1 is the electronic switches such as mechanical switch or electric semiconductor such as contactor.When the power cell operates normally, institute
By-pass switch K1 is stated to be in an off state；When the power cell fault, the by-pass switch K1 is closed automatically, by the power
Unit bypass, frequency convertor system deviate scheduling algorithm by central point, can drive electricity in the range of output voltage capability allows
Machine continues to run.
Meanwhile needing to guarantee to be divided into the II type power cell that at least one in every group of power cell of 3 groups does not bypass, with
When ensuring motor as generator operation, the braking power of the group is effectively absorbed, and system can work normally.
With reference to the accompanying drawings 7, the structural schematic diagram of the embodiment 3 of II type power cell in the utility model.
The II type power cell include input filter device assembly Filter, the 11st full-control type power electronic switch S11 ~
16th full-control type power electronic switch S16, third DC energy storage capacitor C3, the 31st full-control type power electronic switch S31 ~
34th full-control type power electronic switch S34, the 11st full-control type power electronic switch S11 and the 14th full-control type electricity
Power electronic switch S14, the 13rd full-control type power electronic switch S13 and the 16th full-control type power electronic switch S16, the 15th
Full-control type power electronic switch S15 and the 12nd full-control type power electronic switch S12 is connected in parallel again after being connected in series respectively, institute
State the 11st full-control type power electronic switch S11 and the 14th full-control type power electronic switch S14, the 13rd full-control type electric power electricity
Sub switch S13 and the 16th full-control type power electronic switch S16, the 15th full-control type power electronic switch S15 and the 12nd is complete
The point that control type power electronic switch S12 is connected in series is connected to the output end of input filter device assembly Filter, the input filter
AC input terminal R, S, the T of the input terminal of wave device assembly Filter as the II type power cell, the described 11st full control
Type electronic power switch S11 and the 14th full-control type power electronic switch S14, the 13rd full-control type power electronic switch S13 and
16th full-control type power electronic switch S16, the 15th full-control type power electronic switch S15 and the 12nd full-control type power electronic
The both ends that switch S12 is connected in parallel after being connected in series are formed respectively as DC bus DC+, DC- of the II type power cell
Three-phase active rectifier structure, the third DC energy storage capacitor C3 be connected to the II type power cell DC bus DC+,
DC-, the 31st full-control type power electronic switch S31 and the 32nd full-control type power electronic switch S32, the 33rd
Full-control type power electronic switch S33 and the 34th full-control type power electronic switch S34 are connected in series respectively, the point of series connection
The first AC output terminal T1 respectively as the II type power cell and the second AC output terminal T2, the described 31st
Full-control type power electronic switch S31 and the 32nd full-control type power electronic switch S32, the 33rd full-control type power electronic are opened
It closes the both ends after S33 and the 34th full-control type power electronic switch S34 is connected in series and is respectively connected to the II type power list
DC bus DC+, DC- of member, form single-phase H bridge inverter structure.
When the II type power cell absorbs braking power, the braking power is fed back to electricity by the active rectification
Net realizes the function of inhibiting busbar voltage pump to rise.The input filter device assembly Filter is generally the low of L, LC or LCL structure
Bandpass filter can use transformation when the secondary winding leakage reactance of the input multiwinding transformer is sufficiently large (such as larger than 4%)
The leakage reactance of device replaces this filter assembly, thus simplied system structure.
With reference to the accompanying drawings 8, the structural schematic diagram of the embodiment 4 of II type power cell in the utility model.
The II type power cell is additionally provided in the structure basis of attached II type power cell embodiment 3 shown in Fig. 7
By-pass switch K1, the both ends of the by-pass switch K1 respectively with the first AC output terminal T1 of the II type power cell and
Two AC output terminal T2 connections form the II type power cell for having auto by pass function, to improve the reliability of system.Institute
Stating by-pass switch K1 is the electronic switches such as mechanical switch or electric semiconductor such as contactor.When the power cell operates normally,
The by-pass switch K1 is in an off state；When the power cell fault, the by-pass switch K1 is closed automatically, by the function
Rate unit bypass, frequency convertor system deviate scheduling algorithm by central point, can drive in the range of output voltage capability allows
Motor continues to run.
Meanwhile needing to guarantee to be divided into the II type power cell that at least one in every group of power cell of 3 groups does not bypass, with
When ensuring motor as generator operation, the braking power of the group is effectively absorbed, and system can work normally.
The above-mentioned specific embodiment about I type power cell and II type power cell is only the preferable implementation of the utility model
Example for being explained in detail to the utility model, and is not limitations of the present invention, those skilled in the art
Obviously various equivalent modifications, variations and alternatives can be made to specific embodiment according to content disclosed by the utility model, these
Equivalent modifications, variations and alternatives all should belong to the protection scope of the utility model.The protection scope of the utility model is with this case
Subject to the description of claims.
Claims (8)
1. a kind of high-voltage frequency converter braking circuit topological structure, it is characterised in that: the high-voltage frequency converter is cascade of power units
Formula three-phase high-voltage frequency converter, comprising input multiwinding transformer and power unit assembly, the power unit assembly includes n function
Rate unit, wherein n is natural number, and n >=6, includes m II type power cell in the n power cell, remaining is I
Type power cell, wherein m is natural number, and n > m >=3, the I type power cell are without inhibition DC bus-bar voltage
Pump rises the power cell of function, and the II type power cell is with the power list for inhibiting DC bus-bar voltage pump to rise function
Member, the power cell is there are three AC input terminal, respectively R, S, T, two AC output terminals, and respectively the
One AC output terminal T1, the second AC output terminal T2, the input multiwinding transformer is three-phase multiwinding transformer,
Input terminal of the primary side of the multiwinding transformer as the high-voltage frequency converter, the multiwinding transformer are equipped with n and institute
The vice-side winding that the ac input end for the n power cell stated connects one to one respectively, the n power cell are divided into 3
Group, every group includes at least two power cells, and wherein at least one is II type power cell, and every group of power cell passes through each
From the first AC output terminal T1, the second AC output terminal T2 is sequentially connected in series, and the circuit on one side after series connection is made
For the output end of high-voltage frequency converter, and the other end after 3 groups of power unit cascades connections then links together, as the height
The central node NP of voltage frequency changer.
2. a kind of high-voltage frequency converter braking circuit topological structure according to claim 1, it is characterised in that: the power
The power cell quantity that unit block includes is 3 multiple, and is equally divided into 3 groups of carry out tandem type connections.
3. a kind of high-voltage frequency converter braking circuit topological structure according to claim 1, it is characterised in that: the power
I type power cell in unit block includes the diode D6 of first diode D1 ~ the 6th, the first DC energy storage capacitor C1 and first
The full-control type power electronic switch full-control type power electronic of S1 ~ the 4th switch S4, the first diode D1 and the 4th diode D4,
Third diode D3 and the 6th diode D6, the 5th diode D5 and the second diode D2 are in parallel again after being connected in series respectively to be connected
It connects, the first diode D1 and the 4th diode D4, third diode D3 and the 6th diode D6, the 5th diode D5 and
The point that two diode D2 are connected in series AC input terminal R, S, T as the I type power cell, the first diode D1
With the 4th diode D4, third diode D3 and the 6th diode D6, the 5th diode D5 and the second diode D2 are connected in series
The both ends being connected in parallel afterwards form three phase full bridge uncontrollable rectifier respectively as DC bus DC+, DC- of the I type power cell
Structure, the first DC energy storage capacitor C1 are connected to DC bus DC+, DC- of the I type power cell, and described first is complete
Control type power electronic switch S1 and the second full-control type power electronic switch S2, third full-control type power electronic switch S3 and the 4th are complete
Control type power electronic switch S4 is connected in series respectively, and the point of series connection is exchanged respectively as the first of the I type power cell
Output terminal T1 and the second AC output terminal T2, the first full-control type power electronic switch S1 and the second full-control type electric power electricity
Sub switch S2, the both ends after third full-control type power electronic switch S3 and the 4th full-control type power electronic switch S4 are connected in series are divided
It is not connected to DC bus DC+, DC- of the I type power cell, forms single-phase H bridge inverter structure.
4. a kind of high-voltage frequency converter braking circuit topological structure according to claim 3, it is characterised in that: the I
Type power cell is additionally provided with by-pass switch K1, and the both ends of the by-pass switch K1 are handed over the first of the I type power cell respectively
Flow output terminal T1 and the second AC output terminal T2 connection.
5. a kind of high-voltage frequency converter braking circuit topological structure according to claim 1, it is characterised in that: the power
II type power cell in unit block includes the 11st diode D17 of diode D11 ~ the 17th, the second DC energy storage capacitor
C2, braking resistor R1, the 5th full-control type power electronic switch S5 ~ the 9th full-control type power electronic switch S9, the described 11st
Pole pipe D11 and the 14th diode D14, the 13rd diode D13 and the 16th diode D16, the 15th diode D15 and
12 diode D12 are connected in parallel again after being connected in series respectively, the 11st diode D11 and the 14th diode D14, the
The point that 13 diode D13 and the 16th diode D16, the 15th diode D15 and the 12nd diode D12 are connected in series is made
For AC input terminal R, S, T of the II type power cell, the 11st diode D11 and the 14th diode D14,
13 diode D13 and the 16th diode D16, the 15th diode D15 and the 12nd diode D12 be connected in series after simultaneously
Both ends DC bus DC+, the DC- respectively as the II type power cell for joining connection, form three phase full bridge uncontrollable rectifier knot
Structure, the second DC energy storage capacitor C2 are connected to DC bus DC+, DC- of the II type power cell, the described 5th full control
Type electronic power switch S5 and the 6th full-control type power electronic switch S6, the 7th full-control type power electronic switch S7 and eight convergent points control
Type electronic power switch S8 is connected in series respectively, and the point of series connection is defeated respectively as the first exchange of the II type power cell
Terminal T1 and the second AC output terminal T2, the 5th full-control type power electronic switch S5 and the 6th full-control type power electronic out
Distinguish at both ends after switch S6, the 7th full-control type power electronic switch S7 and eight convergent points control type power electronic switch S8 are connected in series
Be connected to DC bus DC+, DC- of the II type power cell, form single-phase H bridge inverter structure, the braking resistor R1 with
17th diode D17 is connected in series after being connected in parallel with the 9th full-control type power electronic switch S9, after series connection
Wherein one end is connected to DC bus DC+, and the other end is connected to DC bus DC-, forms DC chopped-wave brake structure.
6. a kind of high-voltage frequency converter braking circuit topological structure according to claim 1, it is characterised in that: the power
II type power cell in unit block include input filter device assembly Filter, the 11st full-control type power electronic switch S11 ~
16th full-control type power electronic switch S16, third DC energy storage capacitor C3, the 31st full-control type power electronic switch S31 ~
34th full-control type power electronic switch S34, the 11st full-control type power electronic switch S11 and the 14th full-control type electricity
Power electronic switch S14, the 13rd full-control type power electronic switch S13 and the 16th full-control type power electronic switch S16, the 15th
Full-control type power electronic switch S15 and the 12nd full-control type power electronic switch S12 is connected in parallel again after being connected in series respectively, institute
State the 11st full-control type power electronic switch S11 and the 14th full-control type power electronic switch S14, the 13rd full-control type electric power electricity
Sub switch S13 and the 16th full-control type power electronic switch S16, the 15th full-control type power electronic switch S15 and the 12nd is complete
The point that control type power electronic switch S12 is connected in series is connected to the output end of input filter device assembly Filter, the input filter
AC input terminal R, S, the T of the input terminal of wave device assembly Filter as the II type power cell, the described 11st full control
Type electronic power switch S11 and the 14th full-control type power electronic switch S14, the 13rd full-control type power electronic switch S13 and
16th full-control type power electronic switch S16, the 15th full-control type power electronic switch S15 and the 12nd full-control type power electronic
The both ends that switch S12 is connected in parallel after being connected in series are formed respectively as DC bus DC+, DC- of the II type power cell
Three-phase active rectifier structure, the third DC energy storage capacitor C3 be connected to the II type power cell DC bus DC+,
DC-, the 31st full-control type power electronic switch S31 and the 32nd full-control type power electronic switch S32, the 33rd
Full-control type power electronic switch S33 and the 34th full-control type power electronic switch S34 are connected in series respectively, the point of series connection
The first AC output terminal T1 respectively as the II type power cell and the second AC output terminal T2, the described 31st
Full-control type power electronic switch S31 and the 32nd full-control type power electronic switch S32, the 33rd full-control type power electronic are opened
It closes the both ends after S33 and the 34th full-control type power electronic switch S34 is connected in series and is respectively connected to the II type power list
DC bus DC+, DC- of member, form single-phase H bridge inverter structure.
7. a kind of high-voltage frequency converter braking circuit topological structure according to claim 5 or 6, it is characterised in that: described
II type power cell is additionally provided with by-pass switch K1, the both ends of the by-pass switch K1 respectively with the II type power cell first
AC output terminal T1 and the second AC output terminal T2 connection, meanwhile, it is divided into every group of power cell of 3 groups at least provided with one
A II type power cell not bypassed.
8. a kind of high-voltage frequency converter braking circuit topological structure according to claim 1, it is characterised in that: the high voltage variable
The voltage class of frequency device is 3 ~ 35kV.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920768313.XU CN209627231U (en) | 2019-05-27 | 2019-05-27 | A kind of high-voltage frequency converter braking circuit topological structure |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110048596A (en) * | 2019-05-27 | 2019-07-23 | 上海能传电气有限公司 | A kind of high-voltage frequency converter braking circuit topological structure |
| CN111564980A (en) * | 2020-05-11 | 2020-08-21 | 江苏安方电力科技有限公司 | High-capacity alternating-current variable-frequency power supply based on super capacitor |
-
2019
- 2019-05-27 CN CN201920768313.XU patent/CN209627231U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110048596A (en) * | 2019-05-27 | 2019-07-23 | 上海能传电气有限公司 | A kind of high-voltage frequency converter braking circuit topological structure |
| CN111564980A (en) * | 2020-05-11 | 2020-08-21 | 江苏安方电力科技有限公司 | High-capacity alternating-current variable-frequency power supply based on super capacitor |
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