CN105897004B - A kind of electric power electric transformer topological structure of more level DC bus self-balancings - Google Patents
A kind of electric power electric transformer topological structure of more level DC bus self-balancings Download PDFInfo
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- CN105897004B CN105897004B CN201610343961.1A CN201610343961A CN105897004B CN 105897004 B CN105897004 B CN 105897004B CN 201610343961 A CN201610343961 A CN 201610343961A CN 105897004 B CN105897004 B CN 105897004B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M5/4585—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only having a rectifier with controlled elements
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M7/219—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
- H02M7/487—Neutral point clamped inverters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
- H02M1/007—Plural converter units in cascade
Abstract
The present invention relates to a kind of electric power electric transformer topological structures of more level DC bus self-balancings, it is characterised in that: it includes high-voltage rectifier, DC/DC translation circuit and low voltage DC/AC inverter circuit；The input terminal of the high-voltage rectifier is connect with high pressure three-phase AC grid, the output end of the high-voltage rectifier is connect through high voltage dc bus with DC/DC translation circuit one end, the DC/DC translation circuit other end is connect with the low voltage DC/AC inverter circuit input terminal, and the low voltage DC/AC inverter circuit output end is connect with low-voltage three-phase AC power grid.The Voltage Feedback that topological structure of the invention does not need dc-link capacitance carries out capacitance voltage equilibrium, and the control algolithm of rectification side greatly simplifies.
Description
Technical field
The present invention relates to a kind of electric power electric transformer topological structures, especially with regard in a kind of power electronics field
More level DC bus self-balancings electric power electric transformer topological structure.
Background technique
Electric power electric transformer (Power Electronic Transformer, PET) is transmitted as a kind of new electric energy
Equipment has the advantage that 1, volume and weight greatly reduce relative to traditional power transformer.2, any amplitude may be implemented
With the ac-dc conversion of frequency, first and second side voltage current waveform is controllable, and power factor is adjustable.3, it carries reactive compensation and protects
Protective function is not necessarily to additional corollary apparatus.
The current full-controlled device in PET mostly uses Si based insulation grid bipolar junction transistor (Insulated Gate
Bipolar Transistor, IGBT), but due to the limitation of Si base IGBT voltage and power grade, it is difficult to meet in power distribution network
Press the requirement of side voltage class.In the three-phase distribution net PET topology proposed at present, the form of multi-level converter is mostly used,
Thus the voltage stress that individual devices are born is reduced, it is easy to accomplish high-voltage large-capacity, while being exported under same switch frequency
For voltage current waveform closer to sine, harmonic content is low.
The topology of diode clamp formula is as the most frequently used more level topologys, but DC capacitor voltage imbalance is
Its main problem controlled.In the case where transmitting active, circuit needs to carry out capacitive balance control, this makes the control of circuit
Algorithm processed becomes complex with the increase of level number.At present for the algorithm of diode clamp topology DC bus capacitor balance
Study it is more, but majority can only to three-level topology realize capacitor voltage equalizing control, for five level topologys only in specific condition
Lower realization, when level number further increases, the control of DC capacitor voltage balance will be difficult to realize.
Summary of the invention
In view of the above-mentioned problems, the object of the present invention is to provide a kind of power electronics transformations of more level DC bus self-balancings
Device topological structure, the Voltage Feedback which does not need dc-link capacitance carry out capacitance voltage equilibrium, the control of rectification side
Algorithm processed greatly simplifies.
To achieve the above object, the present invention takes following technical scheme: a kind of electric power of more level DC bus self-balancings
Electronic transformer topological structure, it is characterised in that: it includes high-voltage rectifier, DC/DC translation circuit and low voltage DC/AC inversion
Circuit；The input terminal of the high-voltage rectifier is connect with high pressure three-phase AC grid, the output end of the high-voltage rectifier
It is connect through high voltage dc bus with DC/DC translation circuit one end, the DC/DC translation circuit other end and the low pressure
The connection of DC/AC inverter circuit input terminal, the low voltage DC/AC inverter circuit output end are connect with low-voltage three-phase AC power grid.
Preferably, the high-voltage rectifier includes the diode clamp formula multi-level rectifying circuit of A, B, C parallel three phase,
Diode clamp formula multi-level rectifying circuit input end described in every phase is connect with high pressure three-phase AC grid, two poles described in every phase
Pipe clamped multi-level rectification circuit output end is connected to the high voltage dc bus；The high voltage dc bus is straight by 2n-2
Flow bus capacitor C1、C2、…、C2n-2It cascades.
Preferably, the number of levels of diode clamp formula multi-level rectifying circuit described in every phase is according on high-tension side voltage etc.
Grade and the IGBT device stress levels used are adjusted.
Preferably, the DC/DC translation circuit includes 2n-2 high-frequency inversion H bridge submodule HBh, medium/high frequency transformer and
2n-2 high-frequency rectification H bridge submodule HBl, n is natural number；The 2n-2 high-frequency inversion H bridge submodule HBhInput terminal connection
The high voltage dc bus, output end are separately connected 2n-2 input port of the medium/high frequency transformer, and the medium-high frequency becomes
2n-2 output port of depressor is separately connected the 2n-2 high-frequency rectification H bridge submodule HBlInput terminal；The 2n-2 high frequency
Rectify H bridge submodule HBlThe low voltage DC/AC inverter circuit is connected to after output end is in parallel.
Preferably, the high-frequency inversion H bridge submodule HBhQuantity and the high voltage dc bus in dc-link capacitance
Quantity is consistent, and each high-frequency inversion H bridge submodule HBhIt is correspondingly connected with a dc-link capacitance.
Preferably, the medium/high frequency transformer inputs m export structure, k=2n-2 using k；The medium/high frequency transformer m
Output port is separately connected the m high-frequency rectification H bridge submodule HBl, the m high-frequency rectification H bridge submodule HBlOutput end
Parallel connection forms single low-voltage direct bus.
Preferably, the medium/high frequency transformer inputs m export structure, k=2n-2 using k；The medium/high frequency transformer m
Output port is separately connected the m high-frequency rectification H bridge submodule HBl, the m high-frequency rectification H bridge submodule HBlOutput end
Parallel connection forms three discrete low-voltage direct buses.
Preferably, the medium/high frequency transformer uses single-input single-output structure, the medium/high frequency transformer output port connection
The 2n-2 high-frequency rectification H bridge submodule HBl, the 2n-2 high-frequency rectification H bridge submodule HBlThe final shape in parallel of output end
At single low-voltage direct bus.
Preferably, the low voltage DC/AC inverter circuit uses the inverter circuit of three-phase, the DC/DC translation circuit output
End is in parallel to form single low-voltage direct bus, and the inverter circuit is three-phase inversion topological, and the three-phase inversion topological uses two
Pole pipe clamped three-level three-phase inverting circuit uses simple three-phase H bridge inversion topological.
Preferably, the low voltage DC/AC inverter circuit uses the single-phase inversion circuit of three star-like connections, the DC/DC
Translation circuit output end parallel connection forms three discrete low-voltage direct buses, and the single-phase inversion circuit uses three single-phase H
Bridge topology or single-phase multi-level inverter circuit.
The invention adopts the above technical scheme, which has the following advantages: electric power electric transformer topology of the invention
The more level blocks of diode clamp formula are used in high-pressure side, are asked for the pressure of the cascade high voltage dc bus capacitor of rectification side
Topic is connected to the H bridge of each dc-link capacitance by controlling, so that the two of rectification stage by the way of rear class hardware clamp
The Voltage Feedback that pole pipe clamped multi-level circuit does not need dc-link capacitance carries out capacitance voltage equilibrium, the control of rectification side
Algorithm greatly simplifies.
Detailed description of the invention
Fig. 1 is overall structure diagram of the invention；
Fig. 2 is high-pressure side rectification circuit schematic diagram of the invention；
Fig. 3 is the first DC/DC translation circuit schematic diagram of internal structure of the invention；
Fig. 4 is second of DC/DC translation circuit schematic diagram of internal structure of the invention；
Fig. 5 is the third DC/DC translation circuit schematic diagram of internal structure of the invention；
Fig. 6 is the first DC/AC translation circuit structural schematic diagram of the invention；
Fig. 7 is second of DC/AC translation circuit structural schematic diagram of the invention.
Specific embodiment
The present invention is described in detail below with reference to the accompanying drawings and embodiments.
As shown in Figure 1, the present invention provides a kind of electric power electric transformer topological structure of more level DC bus self-balancings,
It includes high-voltage rectifier, DC/DC translation circuit and low voltage DC/AC inverter circuit.The input terminal and height of high-voltage rectifier
Three-phase AC grid connection is pressed, the output end of high-voltage rectifier is connect through high voltage dc bus with DC/DC translation circuit one end,
The DC/DC translation circuit other end is connect with low voltage DC/AC inverter circuit input terminal, low voltage DC/AC inverter circuit output end with it is low
Press three-phase AC grid connection.
In above-described embodiment, as shown in Fig. 2, high-voltage rectifier include A, B, C parallel three phase diode clamp formula it is more
Level rectifying circuit, every diode phase clamped multi-level rectifier circuit structure is identical, is only with wherein A phase cascaded H-bridges topology
Example describes to high-voltage rectifier in detail.A diode phase clamped multi-level rectification circuit input end intersects with high pressure three
The connection of galvanic electricity net A commutating phase input terminal, A diode phase clamped multi-level rectification circuit output end are connected to high voltage direct current mother
Line.High voltage dc bus is by 2n-2 dc-link capacitance C1、C2、…、C2n-2It cascades.Wherein, every diode phase clamps formula
The number of levels of multi-level rectifying circuit is adjusted according on high-tension side voltage class and the IGBT device stress levels used
It is whole.
In the various embodiments described above, as shown in figure 3, DC/DC translation circuit includes 2n-2 high-frequency inversion H bridge submodule HBh、
Medium/high frequency transformer and 2n-2 high-frequency rectification H bridge submodule HBl, n is natural number.2n-2 high-frequency inversion H bridge submodule HBh
Input terminal connects high voltage dc bus, and output end is separately connected 2n-2 input port of medium/high frequency transformer, medium-high frequency transformation
2n-2 output port of device is separately connected 2n-2 high-frequency rectification H bridge submodule HBlInput terminal.2n-2 high-frequency rectification H bridge
Module HBlLow voltage DC/AC inverter circuit is connected to after output end is in parallel.Wherein, high-frequency inversion H bridge submodule HBhQuantity and high
Press dc-link capacitance quantity in DC bus consistent, and each high-frequency inversion H bridge submodule HBhWith a dc-link capacitance
It is correspondingly connected with.
Medium/high frequency transformer can use various structures, in the present embodiment, as shown in figure 3, medium/high frequency transformer may be used also
To input m export structure using k, at this point, k=2n-2；Each input port of medium/high frequency transformer is separately connected each high-frequency inversion H bridge
Submodule HBh, m output port of medium/high frequency transformer be separately connected m high-frequency rectification H bridge submodule HBl, m high-frequency rectification H
Bridge submodule HBlThe final single low-voltage direct bus of formation in parallel of output end；Or m output port of medium/high frequency transformer connects respectively
Meet m high-frequency rectification H bridge submodule HBl, m high-frequency rectification H bridge submodule HBlOutput end is final in parallel formed three it is discrete
Low-voltage direct bus (as shown in Figure 4).As shown in figure 5, medium/high frequency transformer can use single-input single-output structure, at this point, middle height
Frequency power transformer output port connects 2n-2 high-frequency rectification H bridge submodule HBl, 2n-2 high-frequency rectification H bridge submodule HBlOutput
The final single low-voltage direct bus of formation in parallel in end.
In the various embodiments described above, low voltage DC/AC inverter circuit can use the inverter circuit of three-phase, can also use three
The single-phase inversion circuit of star-like connection.When DC/DC translation circuit output end parallel connection forms single low-voltage direct bus, low pressure
DC/AC inverter circuit uses the inverter circuit of three-phase, at this point, inverter circuit is three-phase inversion topological (as shown in Figure 6), three contraries
Variable topological can be using diode clamping tri-level three-phase inverting circuit or using other three-phase multi-level inverse conversion topologys or list
Pure three-phase H bridge inversion topological.It is low when DC/DC translation circuit output end parallel connection forms three discrete low-voltage direct buses
DC/AC inverter circuit is pressed to use the single-phase inversion circuit of three star-like connections, single-phase inversion circuit is opened up using three single-phase H bridges
Flutter (as shown in Figure 7) or single-phase multi-level inverter circuit such as diode clamp inverter circuit.
In conclusion the high-frequency inversion H bridge submodule of following stage can be passed through for cascade high voltage dc bus capacitor
HBhBalance route is carried out to its voltage.By controlling high-frequency inversion H bridge submodule HBhBetween phase difference can control H bridge it
Between flow of power, to achieve the purpose that cascade high voltage dc-link capacitance electric voltage equalization.Cascade high voltage direct current is female as a result,
Line capacitance electric voltage equalization connects the high-frequency inversion H bridge submodule HB of medium/high frequency transformer by control rear classhIt realizes, and for whole
The diode clamp multi-level rectifying circuit for flowing side does not need then to carry out cascade capacitive balance control in the control algolithm of rectification side
System, general voltage, current double closed-loop SPWM or SVPWM algorithm can cascade dc-link capacitance voltage and defeated to high-pressure side
The current phase entered is controlled, and the complexity of front-end rectification stage control algolithm is enormously simplified, and is conducive to multi-level circuit electricity
The promotion of number is put down, so that diode clamp multi-level circuits more than seven level is able to carry out practical application.
The various embodiments described above are merely to illustrate the present invention, and structure and size, setting position and the shape of each component are all can be with
It is varied, based on the technical solution of the present invention, the improvement and wait that all principles according to the present invention carry out individual part
With transformation, should not exclude except protection scope of the present invention.
Claims (10)
1. a kind of electric power electric transformer topological structure of more level DC bus self-balancings, it is characterised in that: it includes high pressure
Rectification circuit, DC/DC translation circuit and low voltage DC/AC inverter circuit；The input terminal and high pressure three-phase of the high-voltage rectifier
The output end of AC network connection, the high-voltage rectifier connects through high voltage dc bus and DC/DC translation circuit one end
It connects, the DC/DC translation circuit other end is connect with the low voltage DC/AC inverter circuit input terminal, the low voltage DC/AC inversion
Circuit output end is connect with low-voltage three-phase AC power grid；
The high-voltage rectifier specifically includes the first rectifier bridge, the second rectifier bridge and third rectifier bridge；First rectification
The structure of bridge, second rectifier bridge and the third rectifier bridge is identical；The A phase of the high pressure three-phase AC grid with it is described
The midpoint of first rectifier bridge is connected, and the B phase of the high pressure three-phase AC grid is connected with the midpoint of second rectifier bridge,
The C phase of the high pressure three-phase AC grid is connected with the midpoint of the third rectifier bridge；
First rectifier bridge includes upper bridge arm and lower bridge arm；The upper bridge arm is identical as the structure of the lower bridge arm, described
Upper bridge arm includes multiple first switch tubes and multiple first diodes, described in each first switch tube reverse parallel connection one
First diode forms the first group in parallel；Multiple described first group series connection in parallel；First first switch tube of the upper bridge arm
Collector be connected with one end of capacitor C1；
The lower bridge arm includes multiple second switches and multiple second diodes；Each second switch reverse parallel connection
One second diode forms the second group in parallel；Multiple described second group series connection in parallel；First of the lower bridge arm
The collector of two switching tubes is connected with one end of the capacitor C1；
First second group in parallel of the last one the first group in parallel of the upper bridge arm and the lower bridge arm is one in parallel
Series string；Successively increase the second group in parallel of first group and a lower bridge arm in parallel of the upper bridge arm, then simultaneously
Join a series string, until being added to second first group in parallel of the upper bridge arm and the penultimate of the lower bridge arm
Second group in parallel；The series string includes multiple concatenated third diodes；
Serial number mark is carried out to the series string according to the quantity of concatenated third diode, wherein concatenated third diode
Minimum number series string be the first series string；The central point of first series string and the central point of the second series string are connected
It connects；From the second series connection start of string, two of the central points of two adjacent third diodes and next layer of series string corresponding position
The central point of third diode is connected；Two third diodes at the last layer series string both ends in first rectifier bridge
The central point of two third diodes at the last layer series string both ends and described the in central point and second rectifier bridge
The central point of two third diodes at the last layer series string both ends is connected in three rectifier bridges；
The more level blocks of diode clamp formula are used in high-pressure side, for the pressure of the cascade high voltage dc bus capacitor of rectification side
Problem is connected to the H bridge of each dc-link capacitance by controlling by the way of rear class hardware clamp, so that rectification stage
It is balanced that the Voltage Feedback that diode clamp formula multi-level circuit does not need dc-link capacitance carries out capacitance voltage；
For cascade high voltage dc bus capacitor, its voltage is carried out by the high-frequency inversion H bridge submodule HBh of following stage equal
Weighing apparatus control；It can control the flow of power between H bridge by the phase difference between control high-frequency inversion H bridge submodule HBh, thus
Achieve the purpose that cascade high voltage dc-link capacitance electric voltage equalization；Cascade high voltage dc bus capacitance voltage equilibrium is logical as a result,
The high-frequency inversion H bridge submodule HBh realization of control rear class connection medium/high frequency transformer is crossed, and for the diode clamp of rectification side
Multi-level rectifying circuit does not need then to carry out cascade capacitive balance control in the control algolithm of rectification side.
2. a kind of electric power electric transformer topological structure of more level DC bus self-balancings as described in claim 1, special
Sign is: the high-voltage rectifier includes the diode clamp formula multi-level rectifying circuit of A, B, C parallel three phase, described in every phase
Diode clamp formula multi-level rectifying circuit input end is connect with high pressure three-phase AC grid, diode clamp formula described in every phase
Multi-level rectifying circuit output end is connected to the high voltage dc bus；The high voltage dc bus is by 2n-2 DC bus electricity
Hold C1, C2 ..., C2n-2 cascades.
3. a kind of electric power electric transformer topological structure of more level DC bus self-balancings as claimed in claim 2, special
Sign is: the number of levels of diode clamp formula multi-level rectifying circuit described in every phase according on high-tension side voltage class and makes
IGBT device stress levels are adjusted.
4. a kind of electric power electric transformer topological structure of more level DC bus self-balancings as described in claim 1, special
Sign is: the DC/DC translation circuit includes 2n-2 high-frequency inversion H bridge submodule HBh, medium/high frequency transformer and 2n-2 high
Frequency rectification H bridge submodule HBl, n are natural number；The 2n-2 high-frequency inversion H bridge submodule HBh input terminal connects the high pressure
DC bus, output end are separately connected 2n-2 input port of the medium/high frequency transformer, the medium/high frequency transformer 2n-2
A output port is separately connected the 2n-2 high-frequency rectification H bridge submodule HBl input terminal；The 2n-2 high-frequency rectification H bridge
The low voltage DC/AC inverter circuit is connected to after submodule HBl output end is in parallel.
5. a kind of electric power electric transformer topological structure of more level DC bus self-balancings as claimed in claim 4, special
Sign is: dc-link capacitance quantity one in the quantity of the high-frequency inversion H bridge submodule HBh and the high voltage dc bus
It causes, and each high-frequency inversion H bridge submodule HBh is correspondingly connected with a dc-link capacitance.
6. a kind of electric power electric transformer topological structure of more level DC bus self-balancings as claimed in claim 4, special
Sign is: the medium/high frequency transformer inputs m export structure, k=2n-2 using k；M output port of the medium/high frequency transformer
The m high-frequency rectification H bridge submodule HBl are separately connected, the m high-frequency rectification H bridge submodule HBl output end parallel connection is formed
Single low-voltage direct bus.
7. a kind of electric power electric transformer topological structure of more level DC bus self-balancings as claimed in claim 4, special
Sign is: the medium/high frequency transformer inputs m export structure, k=2n-2 using k；M output port of the medium/high frequency transformer
The m high-frequency rectification H bridge submodule HBl are separately connected, the m high-frequency rectification H bridge submodule HBl output end parallel connection is formed
Three discrete low-voltage direct buses.
8. a kind of electric power electric transformer topological structure of more level DC bus self-balancings as claimed in claim 4, special
Sign is: the medium/high frequency transformer uses single-input single-output structure, and the medium/high frequency transformer output port connects the 2n-2
A high-frequency rectification H bridge submodule HBl, the final formation in parallel of the 2n-2 high-frequency rectification H bridge submodule HBl output end are single low
Press DC bus.
9. a kind of electric power electric transformer topological structure of more level DC bus self-balancings as described in claim 1, special
Sign is: the low voltage DC/AC inverter circuit uses the inverter circuit of three-phase, the DC/DC translation circuit output end parallel connection shape
At single low-voltage direct bus, the inverter circuit is three-phase inversion topological, and the three-phase inversion topological uses diode clamp
Three-level three-phase inverter circuit uses simple three-phase H bridge inversion topological.
10. a kind of electric power electric transformer topological structure of more level DC bus self-balancings as described in claim 1, special
Sign is: the low voltage DC/AC inverter circuit uses the single-phase inversion circuit of three star-like connections, the DC/DC translation circuit
Output end parallel connection forms three discrete low-voltage direct buses, the single-phase inversion circuit using three single-phase H bridges topologys or
Single-phase multi-level inverter circuit.
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| CN108322078B (en) * | 2018-05-03 | 2023-10-03 | 易事特集团股份有限公司 | Five-level topological unit and five-level alternating-current-direct-current converter |
| CN112436779A (en) * | 2020-10-21 | 2021-03-02 | 华为技术有限公司 | Electric drive system, power assembly and electric automobile |
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| 《Topology Comparison for Solid State Transformer Implementation》;Sixifo Falcones, et al.;《 2010 IEEE Power and Energy Society General Meeting》;20101231;1-8 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11894765B2 (en) | 2021-07-05 | 2024-02-06 | Delta Electronics (Shanghai) Co., Ltd. | Power conversion device |
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| CN105897004A (en) | 2016-08-24 |
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