CN108306318A - Symmetrical energy-storage system based on Modular multilevel converter - Google Patents
Symmetrical energy-storage system based on Modular multilevel converter Download PDFInfo
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- CN108306318A CN108306318A CN201810025043.3A CN201810025043A CN108306318A CN 108306318 A CN108306318 A CN 108306318A CN 201810025043 A CN201810025043 A CN 201810025043A CN 108306318 A CN108306318 A CN 108306318A
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
-
- 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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
- H02M3/33592—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer having a synchronous rectifier circuit or a synchronous freewheeling circuit at the secondary side of an isolation transformer
-
- 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
- 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 symmetrical energy-storage system based on Modular multilevel converter, including Modular multilevel converter, energy-storage system interface p2, energy-storage system interface n2, isolated form DC/DC circuits, energy-storage units, positive high voltage DC bus, draw positive high voltage DC bus, negative high voltage DC bus certainly and draw negative high voltage DC bus certainly；The k phases of the Modular multilevel converter input termination k phase High Level AC Voltages, the output end of Modular multilevel converter is connected with energy-storage system interface p2 and energy-storage system interface n2 respectively, the output end of the energy-storage system interface p2 and the output end of energy-storage system interface n2 are connected with the input terminal of isolated form DC/DC circuits, and the output end of the isolated form DC/DC circuits is connected with energy-storage units.Symmetrical energy-storage system of the present invention avoids the uneven and traditional concentration non-uniform disadvantage of series connection accumulation unit feedback net side energy of traditional distributed energy-storage units energy distribution, provides high quality safe and reliable symmetrical energy-storage system for electric system.
Description
Technical field
The present invention relates to a kind of symmetrical energy-storage systems, and in particular in a kind of power electronics field based on modularization
The symmetric form complete or collected works Chinese style of multi-level converter and symmetrical centralized energy-storage system.
Background technology
As new-energy grid-connected demand and power system capacity constantly increase, system existing intermittent, fluctuation affected by environment
Property will cause voltage on line side larger to fluctuate, and the negative influence of bigger is caused to power grid security reliability service.To inhibit new energy
Electricity generation grid-connecting fluctuates, and energy-storage system one kind of can yet be regarded as is added and efficiently solves method, buffers net side energy with this, reduces net side energy
Amount fluctuation, improves power quality, to ensure power grid power supply system safe and reliable operation.
People are solved to a wide range of demand of electric power for alleviating energy crisis, and new-energy grid-connected application is urgently expanded, high straightening
Stream transmission of electricity has larger application prospect compared to conventional AC transmission of electricity.Therefore, new energy is connected to the grid, and safely may be used to D.C. high voltage transmission
Requirement by property becomes more stringent, Modular multilevel converter (modular multilevel converter, MMC) because
It has high modularization structure, has many advantages, such as common DC bus, equivalent switching frequency is high, in high-voltage dc transmission
The numerous areas extensive use such as electricity, new-energy grid-connected, significantly improves system security reliability.
In recent years, MMC energy storage technologies can be divided into centralized energy storage in parallel and distributed energy storage in parallel by topological application form,
By whether being isolated and can be divided into non-isolated energy storage and isolated energy storage.Traditional centralization energy storage in parallel, by energy-storage units (energy
Storage unit, ESU) it is directly parallel to high voltage direct current side, it is simple in structure, but since each submodule Voltage unbalance causes
Energy feedback net side is uneven.Energy-storage units are distributed in each submodules of MMC by traditional distributed energy-storage system, need to be to each submodule
The state-of-charge of energy-storage units carries out complicated Balance route in block, distributed energy-storage units to its installation, safeguard, replace,
It is significantly inconvenient that management is brought, and with the increase of power system capacity, MMC submodule numbers need to increase, and voltage is not between submodule
Balance it is more serious, cause its modules balance of voltage more be difficult to control.Therefore, the improvement based on centralized energy-storage system
It is very urgent.
Non-isolated energy storage is without isolating transformer, safe in order to control in mesohigh field although can reduce system cost
And extend for the sake of system service life, high-frequency isolation transformer device need to be increased and constitute isolated energy-storage system.Therefore, of the invention
The symmetrical energy-storage system based on Modular multilevel converter avoids the distribution of traditional distributed energy-storage units energy not
Balance and tradition concentrate the non-uniform disadvantage of series connection accumulation unit feedback net side energy, relate to convert based on modular multilevel
The symmetric form complete or collected works Chinese style of device and symmetrical centralized energy-storage system.
Invention content
It is an object of the invention to overcome the control of traditional distributed energy-storage units complicated, energy distribution is uneven, assembly, dimension
Shield, energy-storage units management inconvenience and the non-uniform defect of the centralized energy-storage units feedback net side energy of tradition, provide and are based on
The symmetric form complete or collected works Chinese style of Modular multilevel converter and symmetrical centralized energy-storage system, for electric system provide high quality,
Safe operation, the uniform energy-storage system of energy feedback net side.
To achieve the above objectives, the technical solution adopted by the present invention is that：
A kind of symmetrical energy-storage system based on Modular multilevel converter, including：Modular multilevel converter 1, storage
Energy system interface p2, energy-storage system interface n2, isolated form DC/DC circuits 3, energy-storage units 4, positive high voltage DC bus, draw certainly just
High voltage dc bus, negative high voltage DC bus and draw negative high voltage DC bus certainly；
The Modular multilevel converter 1 is made of 2k bridge arm of k phases；Every phase bridge arm includes upper and lower two bridges
Arm；Bridge arm is by upper bridge arm inductance L on per phasepiIt is in series to n with submodule 2, per phase lower bridge arm by lower bridge arm inductance LniAnd son
Module n+1 to 2n-1 is in series；
The energy-storage system interface p2 includes：Energy-storage system submodule SMPi, energy-storage system submodule SMPiIt is connected in parallel；
The energy-storage system submodule SMPiIncluding：Upper power tube Tp2i-1With lower power tube Tp2i, upper power tube Tp2i-1With lower power tube
Tp2iIt is connected in series with；
The energy-storage system interface n2 includes：Energy-storage system submodule SMNi, energy-storage system submodule SMNiIt is connected in parallel；
The energy-storage system submodule SMNiIncluding：Upper power tube Tn2i-1With lower power tube Tn2i, upper power tube Tn2i-1With lower power tube
Tn2iIt is connected in series with；
The energy-storage system submodule SMPiPass through upper power tube Tp2i-1It is connected with positive high voltage DC bus, energy-storage system
Module SMPiPass through lower power tube Tp2iIt is connected with positive high voltage DC bus is drawn certainly；The energy-storage system submodule SMNiBy upper
Power tube Tn2i-1It is connected with negative high voltage DC bus is drawn certainly, energy-storage system submodule SMNiPass through lower power tube Tn2iWith negative high voltage
DC bus is connected；
The k phases of the Modular multilevel converter 1, which input, terminates k phase High Level AC Voltages, output end and energy storage in every phase
System sub-modules SMPiInput terminal connection, per output end under phase and energy-storage system submodule SMNiInput terminal connection；
The output end of the energy-storage system interface p2 and the output end of energy-storage system interface n2 are electric with isolated form DC/DC respectively
The input terminal on road 3 is connected, and the output end of the isolated form DC/DC circuits 3 is connected with energy-storage units 4, wherein i=1, and 2,
k。
There are many different structure, half-bridge submodules to be used in engineering for the submodule of the Modular multilevel converter 1
It is more mature.The ac input end of Modular multilevel converter 1, that is, k phases connect k phase High Level AC Voltages, terminal per phase bridge arm midpoint
Voltage is respectively usi, wherein i=1,2, k.
Preferably, the submodule of the Modular multilevel converter 1 mainly uses half-bridge submodule, the half-bridge submodule
Block uses two different access ways, and the inside of the half-bridge submodule includes two power switch tubes and a capacitance, institute
State the series connection that the half-bridge submodule in every phase in bridge arm passes through certain amount, one end and energy-storage system submodule SMPiInput terminal
It is connected, the other end and upper bridge arm inductance LpiIt is connected；Half-bridge submodule in the lower bridge arm per phase passes through the series connection of certain amount,
One end and energy-storage system submodule SMNiInput terminal be connected, the other end and lower bridge arm inductance LniIt is connected；Can according to actual condition,
Consider system cost, whether faulty ride-through capability etc., it is corresponding to select full-bridge submodule, Clamp Shuangzi module, reverse blocking
The existing sub-modular structures, wherein i=1 such as type half-bridge submodule, 2, k.
Preferably, the number of levels of the Modular multilevel converter 1, per the mutually structure of upper and lower bridge arm submodule and
The input ac voltage number of phases can be according to power system capacity grade, system failure redundancy of effort pattern and per mutually upper and lower bridge arm submodule
The stress levels of power switch tube are accordingly adjusted in block.
Preferably, the energy-storage system submodule SMPiInput terminal and output end phase per the submodule 2 of bridge arm in phase
Even, the upper output end P of the energy-storage system interface p2 and lower output end P' respectively with the input terminal P of isolated form DC/DC circuits 3 and
Input terminal P' is connected, the energy-storage system submodule SMNiInput terminal and submodule 2n-1 per phase lower bridge arm output end phase
Even, the lower output end N and upper output end N' of the energy-storage system interface n2 respectively with the input terminal N of isolated form DC/DC circuits 3 and
Input terminal N' is connected, wherein i=1, and 2, k.
Preferably, the outside of the isolated form DC/DC circuits 3 includes two input ports and an output port, described
The inside of isolated form DC/DC circuits 3 includes 2 inversion submodules, 1 two inputs, one output high frequency transformer and 1 commutator
Module；The inversion submodule uses H-bridge inverter circuit or half-bridge inversion circuit, the rectification submodule to use H bridge rectified currents
Add Buck-Boost step-up/step-down circuits behind road or H bridge rectification circuits；The input terminal P and input terminal of the isolated form DC/DC circuits 3
P' is connected with the upper output end P of energy-storage system interface p2 and lower output end P' respectively, the input of the isolated form DC/DC circuits 3
End N and input terminal N' is connected with the lower output end N of energy-storage system interface n2 and upper output end N' respectively, the isolated form DC/DC
The output end of circuit 3 is connected with the input terminal of energy-storage units 4, and complete or collected works' Chinese style energy-storage system I is constituted with this.
Preferably, the outside of the isolated form DC/DC circuits 3 includes two input ports and two output ports, described
The inside of isolated form DC/DC circuits 3 includes 2 inversion submodules, 2 one output high frequency transformers of an input and 2 commutators
Module；The outside of the energy-storage units 4 includes two input ports；The inversion submodule uses H-bridge inverter circuit or half-bridge
Inverter circuit, the rectification submodule add Buck-Boost step-up/step-down circuits after using H bridge rectification circuits or H bridge rectifications；It is described
The input terminal P and input terminal P' of isolated form DC/DC circuits 3 respectively with the upper output end P of energy-storage system interface p2 and lower output end
P' is connected, the input terminal N and input terminal N' of the isolated form DC/DC circuits 3 respectively with the lower output end N of energy-storage system interface n2
Be connected with upper output end N', two output ends of the isolated form DC/DC circuits 3 respectively with two input terminals of energy-storage units 4
It is connected, symmetrical centralized energy-storage system II is constituted with this.
Preferably, 2 inversion submodules described in complete or collected works' Chinese style energy-storage system I are all made of H-bridge inverter circuit, wherein
The input terminal of one H-bridge inverter circuit is connected through a cross-line capacitance in parallel with the output end of energy-storage system interface p2, another H
The input terminal of bridge inverter circuit is connected through a cross-line capacitance in parallel with the output end of energy-storage system interface n2,2 H bridges inversion electricity
The output end on road is connected with two input terminals of two inputs, one output high frequency transformer respectively, and two input, one output high frequency is high
The output end of frequency power transformer is connected with H bridge rectification circuits.
Preferably, 2 inversion submodules described in complete or collected works' Chinese style energy-storage system I are all made of H-bridge inverter circuit, wherein
The input terminal of one H-bridge inverter circuit is connected through a cross-line capacitance in parallel with the output end of energy-storage system interface p2, another H
The input terminal of bridge inverter circuit is connected through a cross-line capacitance in parallel with the output end of energy-storage system interface n2,2 H bridges inversion electricity
The output end on road is connected with two input terminals of two inputs, one output high frequency transformer respectively, and two input, one output high frequency is high
The output end of frequency power transformer is connected with Buck-Boost step-up/step-down circuits again after being connected with H bridge rectification circuits.
Preferably, 2 inversion submodules described in complete or collected works' Chinese style energy-storage system I use half-bridge inversion circuit, wherein
The input terminal of one half-bridge inversion circuit two capacitances being connected in series in parallel are connected with the output end of energy-storage system interface p2 again,
The input terminal of another half-bridge inversion circuit two capacitances being connected in series in parallel output end phase with energy-storage system interface n2 again
Even, the output end of 2 half-bridge inversion circuits is connected with two input terminals of two inputs, one output high frequency transformer respectively, and described two
The output end of one output high frequency transformer of input is connected with H bridge rectification circuits.
Preferably, 2 inversion submodules described in the symmetrical centralized energy-storage system II are all made of H-bridge inverter circuit,
The input terminal of one of H-bridge inverter circuit is connected through a cross-line capacitance in parallel with the output end of energy-storage system interface p2, separately
The input terminal of one H-bridge inverter circuit is connected through a cross-line capacitance in parallel with the output end of energy-storage system interface n2, H bridge inversions
The output end of circuit is connected with the input terminal of one output high frequency transformer of an input, one output high frequency transformer of an input
Output end is connected with H bridge rectification circuits.
Preferably, 2 inversion submodules described in the symmetrical centralized energy-storage system II are all made of H-bridge inverter circuit,
The input terminal of one of H-bridge inverter circuit is connected through a cross-line capacitance in parallel with the output end of energy-storage system interface p2, separately
The input terminal of one H-bridge inverter circuit is connected through a cross-line capacitance in parallel with the output end of energy-storage system interface n2, H bridge inversions
The output end of circuit is connected with the input terminal of one output high frequency transformer of an input, one output high frequency transformer of an input
Output end is connected with Buck-Boost step-up/step-down circuits again after being connected with H bridge rectification circuits.
Preferably, 2 inversion submodules described in the symmetrical centralized energy-storage system II are all made of half-bridge inversion circuit,
Two in parallel of the input terminal of one of half-bridge inversion circuit is connected in series with output end phase of the capacitance again with energy-storage system interface p2
Even, two in parallel of the input terminal of another half-bridge inversion circuit is connected in series with output end phase of the capacitance again with energy-storage system interface n2
Even, the output end of half-bridge inversion circuit is connected with the input terminal of one output high frequency transformer of an input, one output of an input
The output end of high frequency transformer is connected with H bridge rectification circuits.
Preferably, the energy-storage units 4 are connected by multiple energy storage batteries or super capacitor or the series connection of other energy storage subelements
Connect composition.
The present invention has the following advantages due to taking above technical scheme：It is of the present invention to be based on modular multilevel
The symmetrical energy-storage system of converter overcomes traditional distributed by the way of complete or collected works' Chinese style and symmetrical centralized energy stores
Energy-storage units control is complicated, and assembly, maintenance, battery management is inconvenient and the centralized energy-storage units feedback net side energy of tradition is uneven
Even defect provides high quality, safe operation, the uniform energy-storage system of energy feedback net side for electric system.
Description of the drawings
The present invention has following attached drawing：
Fig. 1 is the symmetrical energy-storage system overall structure diagram of the present invention；
Fig. 2 is a variety of submodule topology schematic diagrames of the Modular multilevel converter of the present invention；
Fig. 3 is complete or collected works' Chinese style energy-storage system structural schematic diagram of the present invention；
Fig. 4 is the symmetrical centralized energy-storage system structural schematic diagram of the present invention；
Fig. 5 is the SMP in the energy-storage system interface p2 of the present inventioniInternal structure schematic diagram；
Fig. 6 is the SMN in the energy-storage system interface n2 of the present inventioniInternal structure schematic diagram；
Fig. 7 is complete or collected works' Chinese style the first isolated form DC/DC circuit inner structure schematic diagrames of the present invention；
Fig. 8 is second of isolated form DC/DC circuit inner structure schematic diagram of complete or collected works' Chinese style of the present invention；
Fig. 9 is complete or collected works' Chinese style the third isolated form DC/DC circuit inner structure schematic diagrames of the present invention；
Figure 10 is symmetrical centralized the first isolated form DC/DC circuit inner structure schematic diagrames of the present invention；
Figure 11 is symmetrical centralized second of isolated form DC/DC circuit inner structure schematic diagrames of the present invention；
Figure 12 is symmetrical centralized the third isolated form DC/DC circuit inner structure schematic diagrames of the present invention；
Figure 13 is the first energy-storage units internal structure schematic diagram of the present invention；
Figure 14 is second of energy-storage units internal structure schematic diagram of the present invention；
In figure：
2000-the first the 2001-the first power switch tube of half-bridge circuit
2002-the first diode 2003-inverse-impedance type power switch tube
2100-the first the 2200-the first full-bridge circuit of capacitance
2300-hoop bit-type Shuangzi module 2400-inverse-impedance type half-bridge submodules
3000-the second full-bridge circuit 3100-two input, one output high frequency transformer
3101-the first input winding 3102-the second inputs winding
3103-magnetic cores one 3104-the first export winding
3200-the 3201-the second power switch tubes of third full-bridge circuit
3300-the second the 3330-the four capacitance of capacitance
3331-the four the 3332-the second inductance of half-bridge circuit
3400-the second the 3500-the first inductance of half-bridge circuit
3600-third capacitance 3700-third half-bridge circuits
3800-one input, one output 3801-third of high frequency transformer inputs winding
3802-magnetic cores 2 3803-the second export winding
3900-the four full-bridge circuit 3901-third power switch tube
4001-battery energy storage monomer 4002-super capacitor energy-storage monomers
1-Modular multilevel converter 3-isolated form DC/DC circuits
4-energy-storage units
Specific implementation mode
Below in conjunction with attached drawing, invention is further described in detail.
As shown in Figure 1, the present invention provides a kind of symmetrical energy-storage system based on Modular multilevel converter, it is wrapped
It includes：Modular multilevel converter 1, energy-storage system interface p2, energy-storage system interface n2, isolated form DC/DC circuits 3, energy storage list
Member 4, draws positive high voltage DC bus, negative high voltage DC bus and draws negative high voltage DC bus certainly positive high voltage DC bus certainly；
The Modular multilevel converter 1 is made of 2k bridge arm of k phases；Every phase bridge arm includes upper and lower two bridges
Arm；Bridge arm is by upper bridge arm inductance L on per phasepiWith submodule 2 to niIt is in series, per phase lower bridge arm by lower bridge arm inductance LniAnd son
Module n+1 to 2n-1 is in series；
The energy-storage system interface p2 includes：Energy-storage system submodule SMPi, energy-storage system submodule SMPiIt is connected in parallel,
Energy-storage system submodule SMPiIncluding：Upper power tube Tp2i-1With lower power tube Tp2i, upper power tube Tp2i-1With lower power tube Tp2i
It is connected in series with；；
The energy-storage system interface n2 includes：Energy-storage system submodule SMNi, energy-storage system submodule SMNiIt is connected in parallel,
Energy-storage system submodule SMNiIncluding：Upper power tube Tn2i-1With lower power tube Tn2i, upper power tube Tn2i-1With lower power tube Tn2i
It is connected in series with；
The energy-storage system submodule SMPiPass through upper power tube Tp2i-1It is connected with positive high voltage DC bus, energy-storage system
Module SMPiPass through lower power tube Tp2iIt is connected with positive high voltage DC bus is drawn certainly；The energy-storage system submodule SMNiBy upper
Power tube Tn2i-1It is connected with negative high voltage DC bus is drawn certainly, energy-storage system submodule SMNiPass through lower power tube Tn2iWith negative high voltage
DC bus is connected；
The k phases of the Modular multilevel converter 1, which input, terminates k phase High Level AC Voltages, output end and energy storage in every phase
System sub-modules SMPiInput terminal connection, per output end under phase and energy-storage system submodule SMNiInput terminal connection,
The output end of the energy-storage system interface p2 and the output end of energy-storage system interface n2 are electric with isolated form DC/DC respectively
The input terminal on road 3 is connected, and the output end of the isolated form DC/DC circuits 3 is connected with energy-storage units 4, wherein i=1, and 2,
k。
In the present embodiment, as shown in Figure 1, there are many different structures for the submodule of the Modular multilevel converter 1, partly
Bridge submodule is in engineering using more mature.The ac input end of Modular multilevel converter 1, that is, k phases are per phase bridge arm midpoint
K phase High Level AC Voltages are connect, terminal voltage is respectively usi, wherein in the number of levels of Modular multilevel converter 1 and every phase,
The structure and the input ac voltage number of phases number of phases of lower bridge arm submodule can be according to power system capacity grade, system failure redundancy of effort moulds
The stress levels of power switch tube are accordingly adjusted in formula and every mutually upper and lower bridge arm submodule.
In the present embodiment, as shown in Fig. 2, the submodule of the Modular multilevel converter 1 contains various structures, engineering
It is middle using more mature for half-bridge submodule (half-bridgesub-module, HBSM), such as Fig. 2 (a) and Fig. 2 (b) institutes
Show, half-bridge submodule HBSM1 and HBSM2 use two different access ways, and HBSM1 and two kinds of half-bridge submodules of HBSM2 are equal
It is made of the first half-bridge circuit 2000 and 2100 parallel connection of the first capacitance, first half-bridge circuit 2000 is opened by two the first power
It is in series to close pipe 2001, the upper submodule terminal 101 of lower first power switch tube, 2001 both ends connection and lower submodule in HBSM1
Terminal 102, the upper submodule terminal 101 of upper first power switch tube, 2001 both ends connection and lower submodule terminal 102 in HBSM2.
First power switch tube 2001 is an insulated gate bipolar transistor (power switch tube containing inverse parallel fly-wheel diode
It is not limited to such switching tube, Power MOSFET, silicon carbide, gallium nitride etc. can be according to the use of different operating modes replacement), pass through control
The input of each half-bridge submodule can be with the output level number of control system and the operating status of system with excision.
The submodule of the Modular multilevel converter 1 contains various structures, is modular multilevel in the present embodiment
Second of structure of the submodule of converter 1, as shown in Fig. 2 (c), which is full-bridge submodule (full-bridge
Sub-module, FBSM), full-bridge submodule is made of the first full-bridge circuit 2200 and 2100 parallel connection of the first capacitance, and described first
Full-bridge circuit 2200 is made of two 2000 parallel connections of the first half-bridge circuit, by the input and the excision that control each full-bridge submodule
It can be with the output level number of control system and the operating status of system.It is to have failure with respect to half-bridge submodule sharpest edges
Blocking ability, it is efficient, but the increase of cost is also brought simultaneously.
The submodule of the Modular multilevel converter 1 contains various structures, is modular multilevel in the present embodiment
The third structure of the submodule of converter 1, as shown in Fig. 2 (d), which is Clamp Shuangzi module (clamp-
Double sub-module, CDSM), Clamp Shuangzi module 2300 is by five the first power switch tubes 2001, two the one or two
Pole pipe 2002 and two the first capacitances 2100 are constituted, and the input by controlling each Clamp submodule can be controlled with excision is
The output level number of system and the operating status of system, after short trouble locking occurs for system, Clamp Shuangzi module composition
Modular multilevel converter 1 has the two-way blocking-up ability of fault current.
The submodule of the Modular multilevel converter 1 contains various structures, is modular multilevel in the present embodiment
4th kind of structure of the submodule of converter 1, as shown in Fig. 2 (e), which is inverse-impedance type half-bridge submodule (reverse
Blocking sub-module, RBSM), inverse-impedance type half-bridge submodule 2400 is by first power switch tube 2001 and one
Inverse-impedance type power switch tube 2003 be in series again it is in parallel with the first capacitance 2100 constitute, the inverse-impedance type power switch tube 2003 adopts
Traditional switching device is replaced with two antiparallel inverse-impedance type switching devices, larger cost is not being increased in fact with this
The failure blocking ability of existing Modular multilevel converter 1, by the input and the excision that control each inverse-impedance type half-bridge submodule
Can with the output level number of control system and the operating status of system,
The submodule of the Modular multilevel converter 1 contains various structures, and submodule is not limited to listed above
Several structures, it is other applicable based on enhanced reverse blocking submodule, two-way blocking-up type submodule, mixed type Shuangzi module etc.
In such energy-storage system.
In the present embodiment, as shown in figure 3, the upper output end P of energy-storage system interface p2 and lower output end P' respectively be isolated
The input terminal P of type DC/DC circuits 3 is connected with input terminal P' correspondences, the output end N and output end N' difference of energy-storage system interface n2
It is corresponding with the input terminal N of isolated form DC/DC circuits 3 and input terminal N' to be connected, 301 He of output end of isolated form DC/DC circuits 3
302 are connected with the input terminal of energy-storage units 4 401 and 402 respectively.At this point, Modular multilevel converter 1, energy-storage system interface
P2, energy-storage system interface n2, isolated form DC/DC circuits 3 and energy-storage units 4, positive high voltage DC bus draw positive high voltage direct current mother certainly
Line, negative high voltage DC bus and draw negative high voltage DC bus certainly, collectively forms in the complete or collected works based on Modular multilevel converter
Formula energy-storage system I.
In the present embodiment, as shown in figure 4, the upper output end P of energy-storage system interface p2 and lower output end P' respectively be isolated
The input terminal P of type DC/DC circuits 3P is connected with input terminal P' correspondences, the lower output end N of energy-storage system interface n2 and upper output end
N' is corresponding with the input terminal N and input terminal N' of isolated form DC/DC circuits 3N respectively to be connected, the output of isolated form DC/DC circuits 3P
End 303 and 304 is connected with the input terminal 403 and 404 of the upper energy-storage units ESUP in energy-storage units 4, isolated form DC/DC circuits 3N
Output end 305 and 306 be connected with the input terminal 405 and 406 of the lower energy-storage units ESUN in energy-storage units 4.At this point, modularization
Multi-level converter 1, energy-storage system interface p2, energy-storage system interface n2, isolated form DC/DC circuits 3 and energy-storage units 4, positive height
Pressure DC bus draws positive high voltage DC bus, negative high voltage DC bus and draws negative high voltage DC bus certainly certainly, collectively forms and is based on
The symmetrical centralized energy-storage system II of Modular multilevel converter.
In the present embodiment, as shown in figure 5, the energy-storage system submodule SMP in the energy-storage system interface p2iIt is all made of
One half-bridge circuit, 2000 structure is made of three terminals, and input terminal is middle input terminal 201, and output end is upper leading-out terminal
202 and lower leading-out terminal 203.Middle input terminal 201 is connected with the upper output end of the submodule 2 of Modular multilevel converter 1,
Upper leading-out terminal 202 is connected with positive high voltage DC bus, and lower leading-out terminal 203 draws positive high voltage DC bus with oneself and is connected.It is all
Energy-storage system submodule SMPiModule collectively forms energy-storage system interface p2, and output end is upper output end P and lower output end P',
Its output end is connected with the corresponding interface of isolated form DC/DC circuits 3, wherein i=1, and 2, k.
In the present embodiment, as shown in fig. 6, the energy-storage system submodule SMN in the energy-storage system interface n2iIt is all made of
One half-bridge circuit, 2000 structure is made of three terminals, and input terminal is middle input terminal 204, and output end is upper leading-out terminal
205 and lower leading-out terminal 206.The lower output end phase of the middle input terminal 204 and submodule 2n-1 of Modular multilevel converter 1
Company, upper leading-out terminal 205 draw negative high voltage DC bus with oneself and are connected, and lower leading-out terminal 206 is connected with negative high voltage DC bus.Institute
There is energy-storage system submodule SMNiModule collectively forms energy-storage system interface n2, and output end is upper output end N' and lower output end
N, output end are connected with the corresponding interface of isolated form DC/DC circuits 3, wherein i=1, and 2, k.
In the present embodiment, as shown in fig. 7, for the isolated form DC/DC circuits 3 of complete or collected works' Chinese style energy-storage system I, the isolated form
The outside of DC/DC circuits 3 includes two input ports, one output port.Contain more in the inside of the isolated form DC/DC circuits 3
Structure is planted, is the first isolated form DC/DC circuits in the present embodiment, by two the second full-bridge circuits, 3000, one two inputs
One output 3100, third full-bridge circuits 3200 of high frequency transformer and the second capacitance 3300 composition.The second full-bridge electricity
Road 3000 include four the first power switch tubes 2001, it is described two input one output high frequency transformer 3100 include first input around
Group the 3101, second input winding 3102, first exports winding 3104 and magnetic core 1, and the third full-bridge circuit 3200 wraps
Four the second power switch tubes 3201 are included, second power switch tube 3201 is an insulation containing inverse parallel fly-wheel diode
It is different to be distinguished as device pressure resistance resistant to flow parameter from the first power switch tube 2001 for grid bipolar transistor.Two the second full-bridges
Input terminal 13 is connected with the upper output end P of energy-storage system interface p2 in circuit 3000, input terminal 14 and energy-storage system interface
The lower output end P' of p2 is connected, and input terminal 23 is connected with the upper output end N' of energy-storage system interface n2, input terminal 24 and storage
The lower output end N of energy system interface n2 is connected.Two 3000 ac output end mouths of the second full-bridge circuit are defeated with two inputs one respectively
The the first input input winding 3102 of winding 3101, second for going out high frequency transformer 3100 is connected, two inputs, one output high frequency transformation
First output winding 3104 of device 3100 is connected with the ac input end of third full-bridge circuit 3200, third full-bridge circuit 3200
DC output end is connected with the second capacitance 3300, and the second capacitance 3300 is connected by output port 301,302 with energy-storage units 4.
Second full-bridge circuit 3000 is completed to become DC inversion into the function of exchange, and two inputs, one output high frequency transformer 3100 completes electricity
Air bound from the function with voltage transformation, complete to become AC rectification into the function of direct current, the second capacitance by third full-bridge circuit 3200
3300 complete DC voltage support and filter action.
The isolated form DC/DC circuits 3 of complete or collected works' Chinese style energy-storage system I contain various structures, in the present embodiment for second every
Release DC/DC circuits, as shown in figure 8, it is by two the second full-bridge circuits, 3000, one two inputs, one output high frequency transformer
3100, second half-bridge circuit 3400 of the second capacitance 3300, one of third full-bridge circuit 3200, one and one first electricity
3500 composition of sense increases by second half-bridge circuit 3400 and one first that is, on the first isolated form DC/DC circuit bases
Inductance 3500.Second capacitance 3300 is connected by direct current output port with the input port of the second half-bridge circuit 3400, and the second half
The output port of bridge circuit 3400 is connected with the first inductance 3500, passes through output port 301,302 and 4 phase of energy-storage units later
Even.3500 Buck-Boost step-up/step-down circuits in series of second half-bridge circuit 3400 and the first inductance, the first inductance 3500 are complete
It is acted at inductor filter.
The isolated form DC/DC circuits 3 of complete or collected works' Chinese style energy-storage system I contain various structures, in the present embodiment for the third every
Release DC/DC circuits, as shown in figure 9, it inputs one by 4 third half-bridge circuits 3700, one two of third capacitance 3600, two
Export 3100, third full-bridge circuits 3200 of high frequency transformer and second capacitance 3300 composition, i.e., the first every
On release DC/DC circuit bases, by two the second full-bridge circuits 3000 be replaced with two pairs of third capacitances 3600 respectively with two
Third half-bridge circuit 3700 is in parallel.Described two third capacitances 3600 connect after with 3700 circuit in parallel structure of third half-bridge circuit
Input terminal 13 be connected with the upper output end P of energy-storage system interface p2, input terminal 14 with it is defeated under energy-storage system interface p2
Outlet P' is connected, and input terminal 23 is connected with the upper output end N' of energy-storage system interface n2, and input terminal 24 connects with energy-storage system
The lower output end N of mouth n2 is connected.The ac output end mouth of two third half-bridge circuits 3700 exports high frequency with two inputs one respectively
First input winding 3101, second of transformer 3100 inputs winding 3102 and is connected, two inputs, one output high frequency transformer 3100
First output winding 3104 be connected with the ac input end of third full-bridge circuit 3200, the direct current of third full-bridge circuit 3200 is defeated
Outlet is connected with the second capacitance 3300, and the second capacitance 3300 is connected by output port 301,302 with energy-storage units 4.Two
Completion automatically corrects transformer bias, DC inversion jointly with 3700 parallel-connection structure of third half-bridge circuit after the series connection of three capacitances 3600
At exchange.
In the present embodiment, as shown in Figure 10, for the isolated form DC/DC circuits 3 of symmetrical centralized energy-storage system II, it is described every
Release DC/DC circuits 3 are made of two identical structure 3P and 3N symmetrical above and below, and the outside of isolated form DC/DC circuits 3 includes two
Two output ports of a input port.Contain various structures, this implementation inside 3P and 3N in the isolated form DC/DC circuits 3
It is 3P the and 3N structures in the first isolated form DC/DC circuits in example, isolated form DC/DC circuits 3 are in total by two the second full-bridges
3000, two one inputs of circuit, one output 3800, two the 4th full-bridge circuits 3900 of high frequency transformer and two the 4th capacitances
3330 compositions.Second full-bridge circuit 3000 includes four the first power switch tubes 2001, one output high frequency of an input
Transformer 3800 includes that third input winding 3801, second exports winding 3803 and magnetic core 2 3802, the 4th full-bridge electricity
Road 3900 include four third power switch tubes 3901,3901 and first power switch tube 2001 of the third power switch tube,
Second power switch tube 3201 is distinguished as device pressure resistance resistant to flow parameter difference.3P structural circuits in isolated form DC/DC circuits 3
In in the second full-bridge circuit 3000 input terminal 13 be connected with the upper output end P of energy-storage system interface p2, input terminal 14 and storage
The lower output end P' of energy system interface p2 is connected, input terminal 23 and energy storage in the 3N structural circuits in isolated form DC/DC circuits 3
The upper output end N' of system interface n2 is connected, and input terminal 24 is connected with the lower output end N of energy-storage system interface n2.The first every
3P and 3N in release DC/DC circuits 3 are two kinds of identical symmetrical structures, the exchange of the second full-bridge circuit 3000 in each structure
Output port is connected with the third input winding 3801 of one output high frequency transformer 3800 of an input respectively, and one output of an input is high
Second output winding 3803 of frequency power transformer 3800 is connected with the ac input end of the 4th full-bridge circuit 3900, the 4th full-bridge circuit
3900 DC output end is connected with the 4th capacitance 3330, the 4th capacitance 3330 in 3P type structures by output port 303,
304 are connected with the input port 403,404 of the ESUP in energy-storage units 4, and the 4th capacitance 3330 in 3N type structures passes through output
Port 305,306 is connected with the input port 405,406 of the ESUN in energy-storage units 4.The completion of second full-bridge circuit 3000 will be straight
Flowing inversion becomes the function of exchange, and one output high frequency transformer 3800 of an input completes the function of electrical isolation and voltage transformation,
4th full-bridge circuit 3900 is completed to become AC rectification into the function of direct current, and the 4th capacitance 3330 completes DC voltage support and filter
Wave acts on.
The isolated form DC/DC circuits 3 of symmetrical centralization energy-storage system II contain various structures, are second in the present embodiment
Isolated form DC/DC circuits, as shown in figure 11, the isolated form DC/DC circuits 3 are by two identical structure 3P and 3N symmetrical above and below
Composition, isolated form DC/DC circuits 3 are in total by two the second full-bridge circuits, 3000, two one inputs, one output high frequency transformer
3800, two the 4th full-bridge circuit 3900, two the 4th capacitances, 3330, two the 4th half-bridge circuits 3331 and two second electricity
3332 composition of sense, i.e., under such energy storage pattern on the first isolated form DC/DC circuit bases, increase by two the 4th half-bridge circuits
3331 and two the second inductance 3332.The input terminal that 4th capacitance 3330 passes through direct current output port and the 4th half-bridge circuit 3331
Mouth is connected, and the output port of the 4th half-bridge circuit 3331 and the second inductance 3332 are connected serially to output end, and 3P type structures pass through output
Port 303,304 is connected with the input port 403,404 of the ESUP in energy-storage units 4,3N types structure by output port 305,
306 are connected with the input port 405,406 of the ESUN in energy-storage units 4.4th half-bridge circuit 3331 and the second inductance 3332 are gone here and there
Connection constitutes Buck-Boost step-up/step-down circuits, and the second inductance 3332 completes inductor filter effect.
The isolated form DC/DC circuits 3 of symmetrical centralization energy-storage system II contain various structures, are the third in the present embodiment
Isolated form DC/DC circuits, as shown in figure 12, the isolated form DC/DC circuits 3 are by two identical structure 3P and 3N symmetrical above and below
Composition, isolated form DC/DC circuits 3 input one by 4 third half-bridge circuits 3700, one one of third capacitance 3600, two in total
3800, two the 4th full-bridge circuits 3900 of high frequency transformer and two the 4th capacitance 3330 compositions are exported, i.e., in such model
Under the first isolated form DC/DC circuit bases on, two the second full-bridge circuits 3000 are replaced with two pairs of third capacitances
3600 is in parallel with two third half-bridge circuits 3700 respectively again.Described two third capacitances 3600 connect after with third half-bridge circuit
The input terminal 13 of 3700 circuit in parallel structures is connected with the upper output end P of energy-storage system interface p2, input terminal 14 and energy storage
The lower output end P' of system interface p2 is connected, and input terminal 23 is connected with the upper output end N' of energy-storage system interface n2, input terminal
Son 24 is connected with the lower output end N of energy-storage system interface n2.Two kinds of 3P and 3N in the third isolated form DC/DC circuits 3 are identical
Symmetrical structure, in each structure the ac output end mouth of third half-bridge circuit 3700 respectively with one output high frequency transformation of an input
The third input winding 3801 of device 3800 is connected, the second output winding 3803 and the of one output high frequency transformer 3800 of an input
The ac input end of four full-bridge circuits 3900 is connected, DC output end and 3330 phase of the 4th capacitance of the 4th full-bridge circuit 3900
Even, the input port that the 4th capacitance 3330 in 3P type structures passes through the ESUP in output port 303,304 and energy-storage units 4
403,404 are connected, and the 4th capacitance 3330 in 3N type structures passes through the ESUN's in output port 305,306 and energy-storage units 4
Input port 405,406 is connected.Two third capacitances 3600 are completed after connecting with 3700 parallel-connection structure of third half-bridge circuit jointly
Transformer bias is automatically corrected, DC inversion is at exchange.
In the present embodiment, as shown in figure 13, the energy-storage units 4, it is by several battery energy storage monomers 4001 series connection structure
At, by rationally being controlled in the various embodiments described above, completion charging/discharging function.Battery energy storage amount of monomer, volume, capacity can bases
Power system capacity makes variation.Energy storage monomeric species are without being limited thereto, other suitable energy storage monomers also can access.
In the present embodiment, as shown in figure 14, the energy-storage units 4, it is gone here and there by several super capacitor energy-storage monomers 4002
Connection is constituted, and by rationally being controlled in the various embodiments described above, completes charging/discharging function.Super capacitor energy-storage amount of monomer, volume, appearance
Amount can make variation according to power system capacity.Energy storage monomeric species are without being limited thereto, other suitable energy storage monomers also can access.
This specification the various embodiments described above are only illustration made for the present invention, not limit the patent model of the present invention
It encloses, variety of components of the present invention, structure and size, position, capacity may be changed, in the base of technical solution of the present invention
On plinth, all improvement supplements that individual part is carried out according to description of the invention and attached drawing and equivalents modification or directly indirectly
Other related fields are used in, the covering scope of the present invention should be all belonged to.
The content not being described in detail in this specification belongs to the prior art well known to professional and technical personnel in the field.
Claims (10)
1. a kind of symmetrical energy-storage system based on Modular multilevel converter, which is characterized in that including：Modular multilevel becomes
Parallel operation (1), energy-storage system interface p2, energy-storage system interface n2, isolated form DC/DC circuits (3), energy-storage units (4), positive high voltage are straight
Stream busbar draws positive high voltage DC bus, negative high voltage DC bus and draws negative high voltage DC bus certainly certainly；
The Modular multilevel converter (1) is made of 2k bridge arm of k phases；Every phase bridge arm includes upper and lower two bridge arms；
Bridge arm is by upper bridge arm inductance L on per phasepiIt is in series to n with submodule 2, per phase lower bridge arm by lower bridge arm inductance LniAnd submodule
Block n+1 to 2n-1 is in series；
The energy-storage system interface p2 includes：Energy-storage system submodule SMPi, energy-storage system submodule SMPiIt is connected in parallel；It is described
Energy-storage system submodule SMPiIncluding：Upper power tube Tp2i-1With lower power tube Tp2i, upper power tube Tp2i-1With lower power tube Tp2i
It is connected in series with；
The energy-storage system interface n2 includes：Energy-storage system submodule SMNi, energy-storage system submodule SMNiIt is connected in parallel；It is described
Energy-storage system submodule SMNiIncluding：Upper power tube Tn2i-1With lower power tube Tn2i, upper power tube Tn2i-1With lower power tube Tn2i
It is connected in series with；
The energy-storage system submodule SMPiPass through upper power tube Tp2i-1It is connected with positive high voltage DC bus, energy-storage system submodule
SMPiPass through lower power tube Tp2iIt is connected with positive high voltage DC bus is drawn certainly；The energy-storage system submodule SMNiPass through upper power
Pipe Tn2i-1It is connected with negative high voltage DC bus is drawn certainly, energy-storage system submodule SMNiPass through lower power tube Tn2iWith negative high voltage direct current
Busbar is connected；
The k phases of the Modular multilevel converter (1), which input, terminates k phase High Level AC Voltages, output end and energy storage system in every phase
Unite submodule SMPiInput terminal connection, per output end under phase and energy-storage system submodule SMNiInput terminal connection；
The output end of the energy-storage system interface p2 and the output end of energy-storage system interface n2 respectively with isolated form DC/DC circuits
(3) input terminal is connected, and the output end of the isolated form DC/DC circuits (3) is connected with energy-storage units (4), wherein i=1,
2,···k。
2. the symmetrical energy-storage system based on Modular multilevel converter as described in claim 1, which is characterized in that the mould
The submodule of block multi-level converter (1) uses half-bridge submodule, the half-bridge submodule to use two different access sides
Formula, the inside of the half-bridge submodule include two power switch tubes and a capacitance, it is described per phase on half-bridge in bridge arm
Module passes through the series connection of certain amount, one end and energy-storage system submodule SMPiInput terminal be connected, the other end and upper bridge arm electricity
Feel LpiIt is connected；Half-bridge submodule in the lower bridge arm per phase passes through the series connection of certain amount, one end and energy-storage system submodule
SMNiInput terminal be connected, the other end and lower bridge arm inductance LniIt is connected；Can according to actual condition, consider system cost, be
No faulty ride-through capability, it is corresponding to select full-bridge submodule, Clamp Shuangzi module, inverse-impedance type half-bridge submodule；
The energy-storage system submodule SMPiInput terminal be connected with the output end per the submodule 2 of bridge arm in phase, the energy storage system
Unite interface p2 upper output end P and lower output end P' respectively with the input terminal P of isolated form DC/DC circuits (3) and input terminal P' phases
Even, the energy-storage system submodule SMNiInput terminal be connected with the output end of the submodule 2n-1 per phase lower bridge arm, the storage
Can system interface n2 lower output end N and upper output end N' respectively with the input terminal N and input terminal of isolated form DC/DC circuits (3)
N' is connected, wherein i=1, and 2, k；
The number of levels of the Modular multilevel converter (1), the structure of upper and lower bridge arm submodule and input AC electricity per phase
The pressure number of phases can power be opened in upper and lower bridge arm submodule according to power system capacity grade, system failure redundancy of effort pattern and per phase
The stress levels for closing pipe are accordingly adjusted；
The energy-storage units (4) are connected in series with and are constituted by multiple energy storage batteries or super capacitor or other energy storage subelements.
3. the symmetrical energy-storage system based on Modular multilevel converter as claimed in claim 2, which is characterized in that it is described every
The outside of release DC/DC circuits (3) includes two input ports and an output port, the isolated form DC/DC circuits (3)
Inside includes 2 inversion submodules, 1 two inputs, one output high frequency transformer and 1 rectification submodule；The inversion submodule
Using H-bridge inverter circuit or half-bridge inversion circuit, the rectification submodule adds after using H bridge rectification circuits or H bridge rectification circuits
Buck-Boost step-up/step-down circuits；The input terminal P and input terminal P' of the isolated form DC/DC circuits (3) respectively with energy-storage system
The upper output end P of interface p2 is connected with lower output end P', N' points of the input terminal N and input terminal of the isolated form DC/DC circuits (3)
It is not connected with the lower output end N of energy-storage system interface n2 and upper output end N', the output end of the isolated form DC/DC circuits (3)
It is connected with the input terminal of energy-storage units (4), complete or collected works' Chinese style energy-storage system I is constituted with this.
4. the symmetrical energy-storage system based on Modular multilevel converter as claimed in claim 3, which is characterized in that described complete
2 inversion submodules described in centralized energy-storage system I are all made of H-bridge inverter circuit, the input of one of H-bridge inverter circuit
End is connected through a cross-line capacitance in parallel with the output end of energy-storage system interface p2, the input terminal warp of another H-bridge inverter circuit
One cross-line capacitance in parallel is connected with the output end of energy-storage system interface n2, and the output end of 2 H-bridge inverter circuits is defeated with two respectively
Two input terminals for entering an output high frequency transformer are connected, the output end and H of two input, one output high frequency transformer
Bridge rectification circuit is connected.
5. the symmetrical energy-storage system based on Modular multilevel converter as claimed in claim 3, which is characterized in that described complete
2 inversion submodules described in centralized energy-storage system I are all made of H-bridge inverter circuit, the input of one of H-bridge inverter circuit
End is connected through a cross-line capacitance in parallel with the output end of energy-storage system interface p2, the input terminal warp of another H-bridge inverter circuit
One cross-line capacitance in parallel is connected with the output end of energy-storage system interface n2, and the output end of 2 H-bridge inverter circuits is defeated with two respectively
Two input terminals for entering an output high frequency transformer are connected, the output end and H of two input, one output high frequency transformer
Bridge rectification circuit is connected with Buck-Boost step-up/step-down circuits again after being connected.
6. the symmetrical energy-storage system based on Modular multilevel converter as claimed in claim 3, which is characterized in that described complete
2 inversion submodules described in centralized energy-storage system I use half-bridge inversion circuit, the input of one of half-bridge inversion circuit
End two capacitances being connected in series in parallel are connected with the output end of energy-storage system interface p2 again, another half-bridge inversion circuit it is defeated
Enter end two capacitances being connected in series in parallel to be again connected with the output end of energy-storage system interface n2,2 half-bridge inversion circuits it is defeated
Outlet is connected with two input terminals of two inputs, one output high frequency transformer respectively, two input, one output high frequency transformer
Output end is connected with H bridge rectification circuits.
7. the symmetrical energy-storage system based on Modular multilevel converter as claimed in claim 2, which is characterized in that it is described every
The outside of release DC/DC circuits (3) includes two input ports and two output ports, the isolated form DC/DC circuits (3)
Inside includes 2 inversion submodules, 2 one output high frequency transformers of an input and 2 rectification submodules；The energy-storage units
(4) outside includes two input ports；The inversion submodule uses H-bridge inverter circuit or half-bridge inversion circuit, described whole
It flows after submodule uses H bridge rectification circuits or H bridge rectifications and adds Buck-Boost step-up/step-down circuits；The isolated form DC/DC circuits
(3) input terminal P and input terminal P' is connected with the upper output end P of energy-storage system interface p2 and lower output end P' respectively, it is described every
The input terminal N and input terminal N' of release DC/DC circuits (3) respectively with the lower output end N of energy-storage system interface n2 and upper output end
N' is connected, and two output ends of the isolated form DC/DC circuits (3) are connected with two input terminals of energy-storage units (4) respectively, with
This constitutes symmetrical centralized energy-storage system II.
8. the symmetrical energy-storage system based on Modular multilevel converter as claimed in claim 7, which is characterized in that described right
2 inversion submodules described in centralized energy-storage system II are claimed to be all made of H-bridge inverter circuit, one of H-bridge inverter circuit
Input terminal is connected through a cross-line capacitance in parallel with the output end of energy-storage system interface p2, the input of another H-bridge inverter circuit
End is connected through a cross-line capacitance in parallel with the output end of energy-storage system interface n2, the output end of H-bridge inverter circuit and an input
The input terminal of one output high frequency transformer is connected, the output end and H bridge rectification circuits of one output high frequency transformer of an input
It is connected.
9. the symmetrical energy-storage system based on Modular multilevel converter as claimed in claim 7, which is characterized in that described right
2 inversion submodules described in centralized energy-storage system II are claimed to be all made of H-bridge inverter circuit, one of H-bridge inverter circuit
Input terminal is connected through a cross-line capacitance in parallel with the output end of energy-storage system interface p2, the input of another H-bridge inverter circuit
End is connected through a cross-line capacitance in parallel with the output end of energy-storage system interface n2, the output end of H-bridge inverter circuit and an input
The input terminal of one output high frequency transformer is connected, the output end and H bridge rectification circuits of one output high frequency transformer of an input
It is connected again with Buck-Boost step-up/step-down circuits after being connected.
10. the symmetrical energy-storage system based on Modular multilevel converter as claimed in claim 7, which is characterized in that described
2 inversion submodules described in symmetrical centralization energy-storage system II are all made of half-bridge inversion circuit, one of semi-bridge inversion electricity
Two in parallel of the input terminal on road is connected in series with capacitance and is connected again with the output end of energy-storage system interface p2, another semi-bridge inversion electricity
Two in parallel of the input terminal on road is connected in series with capacitance and is connected again with the output end of energy-storage system interface n2, half-bridge inversion circuit it is defeated
Outlet with one input one output high frequency transformer input terminal be connected, it is described one input one output high frequency transformer output end and
H bridge rectification circuits are connected.
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| CN105897018A (en) * | 2016-05-17 | 2016-08-24 | 中国电力科学研究院 | Topological structure and control method of high-voltage and high-capacity energy storage converter |
| CN106712062A (en) * | 2017-01-20 | 2017-05-24 | 东南大学 | Modular multilevel converter-based composite energy storage system with high discharge depth |
| CN107370392A (en) * | 2017-07-05 | 2017-11-21 | 东南大学 | Towards the electric power electric transformer of mesohigh intelligent distribution network |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110943635A (en) * | 2019-11-07 | 2020-03-31 | 长沙理工大学 | MMC alternating-current side fault energy balance control method based on feedforward control |
| CN112865506A (en) * | 2021-03-17 | 2021-05-28 | 西安交通大学 | MMC dual-sub-module with bidirectional fault current removal capability |
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Application publication date: 20180720 Assignee: Huayi Changneng (Beijing) Technology Co.,Ltd. Assignor: Beijing Jiaotong University Contract record no.: X2023990000817 Denomination of invention: A Symmetric Energy Storage System Based on Modular Multilevel Converters Granted publication date: 20191227 License type: Exclusive License Record date: 20230919 |