CN110022077A - The compound modular multilevel solid-state transformer topological structure of power towards alternating current-direct current mixing power distribution network - Google Patents
The compound modular multilevel solid-state transformer topological structure of power towards alternating current-direct current mixing power distribution network Download PDFInfo
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- CN110022077A CN110022077A CN201910284199.8A CN201910284199A CN110022077A CN 110022077 A CN110022077 A CN 110022077A CN 201910284199 A CN201910284199 A CN 201910284199A CN 110022077 A CN110022077 A CN 110022077A
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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
- H02M7/2173—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 biphase or polyphase circuit arrangement
-
- 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
-
- 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
-
- 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
- H02M7/53—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 using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
Abstract
The invention discloses a kind of power hybrid solid-state converter topologies towards alternating current-direct current mixing power distribution network, including being located on high-tension side Modular multilevel converter, the high frequency AC-DC converter of medial side and the inverter of low-pressure side.It respectively draws a branch and accesses high frequency transformer through capacitance in the three-phase upper and lower bridge arm midpoint of Modular multilevel converter, form a new high frequency power circulation path, and the overlapped high-frequency component in target modulation signal simultaneously, on high-tension side energy is introduced into high frequency transformer through this high frequency circulation path in the form of high frequency power and is sent to low-pressure side, so that high-pressure side input stage and medial side isolation level carry out integrated power conversion using the compound thought of power, effectively reduce power conversion series, power conversion is more integrated, and power transfer efficiency is higher.Meanwhile medium-high frequency transimission power of the present invention will not only flow to high voltage direct current port, but also will not flow to fundamental frequency AC port, without frequency selection devices such as trappers.
Description
Technical field
The invention belongs to high-voltage and high-power power electronic technical fields, relate generally to one kind towards alternating current-direct current mixing power distribution network
Power hybrid solid-state converter topology.
Background technique
In conventional AC power distribution network, power transformer is the key equipment for realizing voltage class transformation and electrical isolation,
But due to its function is more single, need a large amount of magnetic materials and can not be directly accessed or handle DC form electric energy the disadvantages of,
It is unable to satisfy the demand of the following intelligent distribution network, therefore, the solid-state transformer based on all-controlling power electronics device comes into being.
Solid-state transformer was also known as electric power electric transformer, electron electric power voltage device or intelligent transformer, in quilt in 2011
America's MIT magazine is chosen as one of big technology of most potential ten, is the key equipment that the following power distribution network realizes flexible energy routing
One of.Compared with traditional power transformer, solid-state transformer has the advantages that five is big: 1) flexible, continuous input voltage/electric current,
Output voltage/electric current control ability, power transmission are two-way controllable；2) there is integrated harmonic wave/idle/imbalance compensation, move
The power quality controllings abilities such as state voltage recovery；3) it can be directly accessed, handle DC form electric energy, more conducively alternating current-direct current mixed stocker
The flexible interconnection of system；4) full power electronics fault management ability, fault handling time is short, fills without additional relay protection
It sets；5) magnetic material uses few, is not necessarily to transformer oil, more environmentally friendly.
However, existing solid-state transformer can't substitute traditional power transformer completely, reason is in addition to power electronics device
Installation cost caused by part itself manufacturing process is high outer, is also largely determined by key issues of power density is low, transmission efficiency is low.
Have many researchers at present and propose the topology of solid-state transformer, but typically high-pressure side is become using modular multilevel
Parallel operation or cascaded H-bridges converter, medial side carry out DC-DC transformation, conversion stages using ISOP or independent DAB converter
Number is excessive, and complete machine device volume is big, low efficiency.106787861 A of patent of invention CN discloses a kind of modular multilevel full-bridge
Mode of resonance electric power electric transformer topology constructs high-frequency transmission path in each phase bridge arm of the cascaded H-bridges of star-like connection, but it is not
Have high voltage direct current interface, the electric energy of high voltage direct current form can not be directly accessed；107623456 A of patent of invention CN is disclosed
A kind of multiport electric power electric transformer based on MMC is topological and its control method, 107612407 A of patent of invention CN are disclosed
A kind of high power density electric power electric transformer topological structure and its control method, 108832825 A of patent of invention CN are disclosed
A kind of multiport electric power electric transformer topology of high power density, this three patent of invention is all by constructing high frequency power
Circulation path draws high frequency power, but they require the frequency selection devices such as configuration trapper, high-pass filter to guide height
Frequency and the power of low frequency form circulate on demand, and the cost is relatively high.
Summary of the invention
Goal of the invention: for existing solid-state transformer transformation series is more, transmission efficiency is low, and existing power hybrid solid-state
Transformer relies on the problems such as frequency selective device, and the present invention proposes a kind of compound modularization of power towards alternating current-direct current mixing power distribution network
More level solid-state transformer topological structures.
Technical solution: the compound modular multilevel solid-state transformation of the power of the invention towards alternating current-direct current mixing power distribution network
Device topological structure includes: positioned on high-tension side Modular multilevel converter, the high frequency AC-DC converter of medial side and low-pressure side
Inverter；Modular multilevel converter and high frequency AC-DC converter are three-phase structure, and each phase one of the two is a pair of
It answers；Each phase of Modular multilevel converter has upper and lower two bridge arms, and upper and lower bridge arm respectively has two sub- bridge arms up and down,
Each sub- bridge arm includes the unit module and a filter inductance being connected in series；The unit module include cascade one or
Multiple submodule, each submodule are double half-bridge structures；In any phase of Modular multilevel converter, upper son in upper bridge arm
The upper end of bridge arm is connected with the anode of high-voltage DC power supply input terminal, in lower bridge arm under sub- bridge arm lower end and high-voltage DC power supply
The cathode of input terminal is connected, and the tie point of upper and lower bridge arm is connected with a phase port of three-phase high-voltage ac power input end；High frequency
Each phase of AC-DC converter includes a capacitance, a high frequency transformer and a H bridge rectifier；In high-frequency AC-DC
In any phase of converter, the positive and negative anodes of high frequency transformer primary side are connected to modular multilevel via concatenated capacitance and become
Two midpoints of the upper and lower bridge arm of phase are corresponded in parallel operation, the positive and negative anodes on high frequency transformer pair side are connected to H bridge rectifier or so bridge
Two midpoints of arm；The midpoint of bridge arm and the midpoint of lower bridge arm connect respectively in H bridge rectifier in each phase of high frequency AC-DC converter
It is connected to the anode and cathode of the inverter.
Further, inverter is three-phase four-wire system half-bridge structure, for low-voltage dc signal to be transformed into low-voltage alternating-current
Signal.
Further, low-pressure side further includes shunt capacitance, and the both ends of the shunt capacitance are connected to the inverter
Anode and cathode on.
Further, in each phase in high-pressure side, two groups of sub- bridge arm overlapped high-frequency component amplitudes in upper and lower bridge arm are identical,
Opposite in phase, in upper bridge arm under in sub- bridge arm and lower bridge arm upper sub- bridge arm overlapped high-frequency component amplitude, phase it is all the same.
Further, the capacitance in the medial side high frequency AC-DC converter can not only prevent DC form
Electric energy flow into high frequency channel, and can be combined with the filter inductance in each sub- bridge arm composition LC resonance circuit.
The utility model has the advantages that compared with prior art, of the invention is mainly characterized by high-pressure side Modular multilevel converter
And medial side high frequency AC-DC converter carries out integrated power conversion using the compound thought of power, has cooked up new high frequency
Power circulation path integrates high-pressure side input stage and medial side isolation level, effectively reduces power conversion series,
Power conversion is more integrated；The high fdrequency component of its superposition is effectively utilized the characteristics of combination of common mode and differential-mode component simultaneously, so that
Common mode property is presented in high fdrequency component for its own, and differential mode is presented for high voltage direct current, high pressure fundamental frequency AC port
Matter.
Therefore, the present invention can be directly accessed and handle the electric energy of DC form；The high frequency power logical circulation road newly cooked up
Diameter both will not influence high voltage direct current port, also will not influence fundamental frequency AC port, and without additional frequency selection device, cost is more
It is low；Power conversion series can be effectively reduced, so that power conversion is more integrated, power density is further increased, and power passes
Defeated efficiency further increases.
Detailed description of the invention
Fig. 1 is the compound modular multilevel solid-state transformer topological structure of power towards alternating current-direct current mixing power distribution network
Figure；
Fig. 2 is high-pressure side modular multilevel unit module structure chart；
Fig. 3 is high frequency modulation components superposition schematic diagram.
Specific embodiment
Specific explanations explanation is made to technical solution of the present invention below in conjunction with attached drawing.
Such as Fig. 1, the compound modular multilevel solid-state transformer topological structure of power of the invention includes: positioned at high-pressure side
Modular multilevel converter, the high frequency AC-DC converter of medial side and the inverter of low-pressure side.Modular multilevel transformation
Device is used to for high pressure three-phase alternating current or high voltage direct current to be transformed into high voltagehigh frequency exchange.Medial side high frequency AC-DC converter is used for will
The high voltagehigh frequency exchange conversion that Modular multilevel converter obtains is low-voltage direct.Inverter is three-phase four-wire system half-bridge knot
Structure, for low-voltage direct to be transformed into three-phase and four-line low-voltage alternating-current.Modular multilevel converter and high frequency AC-DC converter are equal
Each phase for three-phase structure, and the two corresponds.
High-pressure side Modular multilevel converter includes High Level AC Voltage potential source input terminal, multiple unit modules and multiple filters
Wave inductance.Wherein, each phase of Modular multilevel converter has upper and lower two bridge arms, and upper and lower bridge arm respectively has up and down again
Two sub- bridge arms, each sub- bridge arm include the unit module and a filter inductance being connected in series.Unit module includes grade
One or more submodules of connection, each submodule is double half-bridge structures, as shown in Fig. 2, double half-bridge submodules are by two half-bridge strings
Connection composition, the direct current cathode of upper half-bridge are connected with the direct-flow positive pole of lower half-bridge, friendship of the exchange output of two half-bridges as submodule
Stream output.It, can be in not adding unit module number since double half-bridge structures increase submodule voltage output range
Under the conditions of adding unit module voltage output ability, be capable of providing and the comparable high frequency voltage of fundamental frequency voltages amplitude.In module
In any phase for changing multi-level converter, the anode of upper end and high-voltage DC power supply input terminal that sub- bridge arm is gone up in upper bridge arm is (i.e.
High-voltage DC power supply positive bus-bar) be connected, in lower bridge arm under sub- bridge arm lower end and high-voltage DC power supply input terminal cathode it is (i.e. high
Press DC power supply positive bus-bar) it is connected, the tie point of upper and lower bridge arm is connected with a phase port of three-phase high-voltage ac power input end.
Medial side high frequency AC-DC converter includes three capacitances, three single-phase high frequency transformers and three single-phase H bridges
Rectifier.These three capacitances, three single-phase high frequency transformers and three single-phase H bridge rectifiers belong in three-phase, each
It mutually include a capacitance, a single-phase high frequency transformer and a single-phase H bridge rectifier.Three capacitance one end and height
Press the midpoint (connection of two sub- bridge arms up and down i.e. in each upper bridge arm of three-phase of bridge arm on side Modular multilevel converter three-phase
Point) be connected, the other end is connected with the upper end of high frequency transformer primary side, the lower end of three high frequency transformer primary sides and respectively with high pressure
Midpoint (the connection of two sub- bridge arms up and down i.e. in each lower bridge arm of three-phase of side Modular multilevel converter three-phase lower bridge arm
Point) it is connected, high frequency power circulation path is formed, the upper and lower side on the secondary side of three high frequency transformers is whole with three single-phase H bridges respectively
The midpoint for flowing device or so bridge arm is connected.In other embodiments, three capacitance one end and high-pressure side modularization can also be made
The midpoint of multi-level converter three-phase lower bridge arm is connected, and the other end is connected with the lower end of high frequency transformer primary side, and three high frequencies become
The upper end of depressor primary side be connected respectively with the midpoint of bridge arm on the Modular multilevel converter three-phase of high-pressure side, formed high frequency function
Rate circulation path, the secondary end of three high frequency transformers are connected with the midpoint of three single-phase H bridge rectifiers or so bridge arm respectively.High frequency
The midpoint of bridge arm and the midpoint of lower bridge arm are respectively connected to low pressure side inverter in H bridge rectifier in each phase of AC-DC converter
Anode and cathode.
High-pressure side Modular multilevel converter and medial side high frequency AC-DC converter are carried out using the compound thought of power
Integrated power conversion (is accessed from upper and lower bridge arm midpoint through capacitance high by constructing new high frequency power circulation path
This path of frequency AC-DC transformer), and the overlapped high-frequency component in target modulation signal simultaneously, by high-tension side energy with height
The form of frequency power introduces high-frequency AC-DC transformer through this high frequency circulation path and is sent to low-pressure side, so that high-pressure side
Input stage and the transimission power of medial side isolation level are combined with each other, and effectively reduce power conversion series, power conversion is more
It is integrated.
In addition, high-pressure side Modular multilevel converter three-phase symmetrical is equal, in each phase in high-pressure side, in upper and lower bridge arm
Two groups of sub- bridge arm overlapped high-frequency component amplitudes are identical, opposite in phase, in upper bridge arm under upper sub- bridge arm in sub- bridge arm and lower bridge arm
Overlapped high-frequency component amplitude, phase are all the same, as shown in Figure 3.So, high-pressure side does not need additional frequency selection device
(such as trapper, low-pass filter) come prevent high-frequency ac enter high pressure fundamental frequency exchange and high voltage direct current port so that transmission
High frequency power neither influence high voltage direct current port, also do not influence fundamental frequency AC port.
It is logical that capacitance in medial side high frequency AC-DC converter can not only prevent the electric energy of DC form from flowing into high frequency
Road, and LC resonance circuit can be constituted with sub- bridge arm inductor combination.
Low-pressure side further includes shunt capacitance other than inverter, and the both ends of shunt capacitance are connected to the inverter
On anode and cathode, shunt capacitance plays DC voltage-stabilizing.
The inverter of low-pressure side is used to low-voltage direct being transformed into low-voltage alternating-current, so that the topology has high-voltage alternating, height
Four kinds of straightening stream, low-voltage alternating-current and low-voltage direct universal ports are suitable for alternating current-direct current hybrid power distribution network.
Claims (5)
1. a kind of compound modular multilevel solid-state transformer topological structure of power towards alternating current-direct current mixing power distribution network, including
Positioned on high-tension side Modular multilevel converter, the high frequency AC-DC converter of medial side and the inverter of low-pressure side；Modularization
Multi-level converter and high frequency AC-DC converter are three-phase structure, and each of the two mutually corresponds；
Each phase of Modular multilevel converter has upper and lower two bridge arms, and upper and lower bridge arm respectively has two sub- bridges up and down
Arm, each sub- bridge arm include the unit module and a filter inductance being connected in series；The unit module includes cascade
One or more submodules, each submodule are double half-bridge structures；In any phase of Modular multilevel converter, in upper bridge arm
The upper end of upper sub- bridge arm is connected with the anode of high-voltage DC power supply input terminal, in lower bridge arm under sub- bridge arm lower end and high voltage direct current
The cathode of power input is connected, and the tie point of upper and lower bridge arm is connected with a phase port of three-phase high-voltage ac power input end；
Each phase of high frequency AC-DC converter includes a capacitance, a high frequency transformer and a H bridge rectifier；?
In any phase of high frequency AC-DC converter, the positive and negative anodes of high frequency transformer primary side are connected to module via concatenated capacitance
Change two midpoints that the upper and lower bridge arm of phase is corresponded in multi-level converter, it is whole that the positive and negative anodes on high frequency transformer pair side are connected to H bridge
Flow two midpoints of device or so bridge arm；The midpoint of bridge arm and lower bridge arm in H bridge rectifier in each phase of high frequency AC-DC converter
Midpoint is respectively connected to the anode and cathode of the inverter.
2. the power hybrid solid-state high voltage side of transformer topology according to claim 1 towards alternating current-direct current mixing power distribution network
Structure, it is characterised in that: the inverter is three-phase four-wire system half-bridge structure, is handed over for low-voltage dc signal to be transformed into low pressure
Flow signal.
3. the power hybrid solid-state high voltage side of transformer topology according to claim 1 towards alternating current-direct current mixing power distribution network
Structure, it is characterised in that: the low-pressure side further includes shunt capacitance, and the both ends of the shunt capacitance are connected to the inversion
On the anode and cathode of device.
4. the power hybrid solid-state high voltage side of transformer topology according to claim 1 towards alternating current-direct current mixing power distribution network
Structure, it is characterised in that: in each phase in high-pressure side, two groups of sub- bridge arm overlapped high-frequency component amplitudes in upper and lower bridge arm are identical, phase
Position is on the contrary, above sub- bridge arm overlapped high-frequency component amplitude, phase are all the same in sub- bridge arm and lower bridge arm under in upper bridge arm.
5. the compound modular multilevel solid-state transformation of the power according to claim 1 towards alternating current-direct current mixing power distribution network
Device topological structure, it is characterised in that: the capacitance in the medial side high frequency AC-DC converter can not only prevent direct current
The electric energy of form flows into high frequency channel, and can combine with the filter inductance in each sub- bridge arm and constitute LC resonance circuit.
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| CN201910284199.8A CN110022077B (en) | 2019-04-10 | 2019-04-10 | Power composite type modular multi-level solid-state transformer topological structure for alternating current-direct current hybrid power distribution network |
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| CN111642061A (en) * | 2020-06-01 | 2020-09-08 | 西安交通大学 | Vienna rectifying silicon carbide power module with double-sided structure and preparation method thereof |
| CN111835207A (en) * | 2020-08-11 | 2020-10-27 | 石家庄通合电子科技股份有限公司 | LLC converter and power supply |
| CN112737352A (en) * | 2020-12-28 | 2021-04-30 | 上海理工大学 | Three-phase AC-AC converter based on hexagram connection modularization multi-level |
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| CN111835207A (en) * | 2020-08-11 | 2020-10-27 | 石家庄通合电子科技股份有限公司 | LLC converter and power supply |
| CN112737352A (en) * | 2020-12-28 | 2021-04-30 | 上海理工大学 | Three-phase AC-AC converter based on hexagram connection modularization multi-level |
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| CN110022077B (en) | 2020-07-31 |
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Effective date of registration: 20201210 Address after: No.38 Gongnong East Road, Xiannv Town, Jiangdu District, Yangzhou City, Jiangsu Province 225200 Patentee after: YANGZHOU YONGMAO ELECTRIC POWER CONSTRUCTION Co.,Ltd. Patentee after: YANGZHOU JIANGDU DISTRICT POWER SUPPLY BRANCH OF STATE GRID JIANGSU ELECTRIC POWER Co.,Ltd. Address before: 210024, No. 122, Ning Hai Road, Gulou District, Jiangsu, Nanjing Patentee before: NANJING NORMAL University |
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