CN107017798A - A kind of modular multi-level converter topology with energy-storage function - Google Patents
A kind of modular multi-level converter topology with energy-storage function Download PDFInfo
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- CN107017798A CN107017798A CN201710199581.XA CN201710199581A CN107017798A CN 107017798 A CN107017798 A CN 107017798A CN 201710199581 A CN201710199581 A CN 201710199581A CN 107017798 A CN107017798 A CN 107017798A
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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
- H02M7/66—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal
- H02M7/68—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters
- H02M7/72—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/79—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with 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
- H02M7/797—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with 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
-
- 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The present invention discloses a kind of modular multi-level converter topology with energy-storage function, including three facies units；Each facies unit includes upper bridge arm, lower bridge arm, upper bridge arm inductance, lower bridge arm inductance, wherein：The positive terminal of upper bridge arm as facies unit direct current outlet positive terminal, the negative pole end of upper bridge arm is connected with one end of upper bridge arm inductance, the other end of upper bridge arm inductance is connected with one end of lower bridge arm inductance, it is used as exchange leading-out terminal and current-limiting reactor the connection power network of facies unit, the other end of lower bridge arm inductance is connected with the positive terminal of lower bridge arm, the negative pole end of lower bridge arm as facies unit direct current outlet negative pole end；Upper and lower bridge arm in three facies units is in series by half-bridge submodule and the mixing of class full-bridge energy storage submodule.By the design of class full-bridge energy storage submodule, the present invention can increase inertia for new energy resources system, and the battery charging and discharging electric current used in energy storage is smooth, and voltage class is relatively low, has ensured the Effec-tive Function and security of battery.
Description
Technical field
The invention belongs to technical field of electric automation equipment, specifically, being related to a kind of modularization with energy-storage function
Multilevel Inverters topology.
Background technology
In existing technology, battery is directly parallel in by submodule electric capacity by the submodule with energy-storage function so that
Battery bears the pulsating current of one times of power frequency and two times of power frequencies, unfavorable to the Effec-tive Function and overall life cycle cost of battery；Together
When, actual condition Neutron module capacitance voltage is generally higher than 1500V voltage class, using lithium ion battery as the high magnification of representative electricity
Pond, based on the reason for battery charge state equilibrium and error protection, from cost and security consideration, is extremely difficult to so high series connection
Voltage.
Through retrieval, Publication No. 104917418A Chinese patent application uses battery current the invention provides one kind
The accumulation energy type modular multi-level converter of independent control, its submodule includes：One half-bridge module, a Support Capacitor and one
Individual energy-storage battery.By the independent control to battery current, battery utilization rate and service life are improved.
Publication No. 103580050A Chinese patent application, the invention is related to a kind of many level lithium electricity of high-power modular
Pond energy accumulation current converter device, its submodule is H bridge type energy accumulation current converter modules.Cell voltage is reduced by using submodule quantity
The mode of grade realizes large power energy storage.
The problem of above-mentioned patent can not solve cell voltage grade, the submodule used is more and can not realize energy storage, simultaneously
Cell voltage is relatively low；Secondly, the sub-modular structure that above-mentioned patent is proposed all uses scheme of the cell parallel by DC capacitor, electricity
Pond will necessarily bear the pulsating current of one times of power frequency and two times of power frequencies, to the Effec-tive Function and overall life cycle cost of battery not
Profit.
The content of the invention
For defect of the prior art, battery life and utilization are improved from topology it is an object of the invention to provide one kind
Rate, and it is topological for the accumulation energy type modular multi-level converter that new energy resources system provides inertia.
To realize object above, the present invention provides a kind of modular multi-level converter topology with energy-storage function, bag
Three facies units are included, each facies unit includes upper bridge arm, lower bridge arm, upper bridge arm inductance, lower bridge arm inductance；Wherein：
The positive terminal of the upper bridge arm as facies unit direct current outlet positive terminal；The negative pole end of the upper bridge arm with it is described
One end of upper bridge arm inductance is connected；The other end of the upper bridge arm inductance is connected with one end of the lower bridge arm inductance, is used as phase
The exchange leading-out terminal of unit, and current-limiting reactor is connected to power network；The other end of the lower bridge arm inductance and the lower bridge arm
Positive terminal is connected；The negative pole end of the lower bridge arm as facies unit direct current outlet negative pole end；On described in three facies units
Bridge arm, the lower bridge arm are in series by half-bridge submodule and the mixing of class full-bridge energy storage submodule.
Preferably, in three described facies units：
The quantity of half-bridge submodule in the upper bridge arm is identical with the quantity of the half-bridge submodule in the lower bridge arm；
The quantity of class full-bridge energy storage submodule in the upper bridge arm and the class full-bridge energy storage submodule in the lower bridge arm
Quantity it is identical.
Preferably, described half-bridge submodule, including：First direct current capacitors, it is the first gate-controlled switch device, second controllable
Switching device, and the first fly-wheel diode, the second fly-wheel diode；Wherein：
The first gate-controlled switch device, the second gate-controlled switch device colelctor electrode respectively with first afterflow two
Pole pipe, the negative electrode of second fly-wheel diode are connected；The first gate-controlled switch device, the second gate-controlled switch device
Anode of the emitter stage respectively with first fly-wheel diode, second fly-wheel diode is connected；First gate-controlled switch
The colelctor electrode of device is connected with the anode of first direct current capacitors；The emitter stage of the second gate-controlled switch device with it is described
The negative electrode of first direct current capacitors is connected；First controllable devices, the grid of the second controllable devices are connected with control circuit.
Preferably, described class full-bridge energy storage submodule, including：Second direct current capacitors, battery, power sense cell, the 3rd
Gate-controlled switch device, the 4th gate-controlled switch device, the 5th gate-controlled switch device, the 6th gate-controlled switch device, and the 3rd afterflow
Diode, the 4th fly-wheel diode, the 5th fly-wheel diode, the 6th fly-wheel diode；Wherein：
The 3rd gate-controlled switch device, the 4th gate-controlled switch device, the 5th gate-controlled switch device, described
The colelctor electrode of six gate-controlled switch devices continues with the 3rd fly-wheel diode, the 4th fly-wheel diode, the described 5th respectively
Flow diode, the negative electrode of the 6th fly-wheel diode is connected；The 3rd gate-controlled switch device, the 4th gate-controlled switch device
Part, the 5th gate-controlled switch device, the 6th gate-controlled switch device emitter stage respectively with the 3rd fly-wheel diode,
4th fly-wheel diode, the 5th fly-wheel diode, the anode of the 6th fly-wheel diode are connected；Described 3rd can
The colelctor electrode of control switching device is connected with the anode of second direct current capacitors；The emitter stage of the 4th gate-controlled switch device
It is connected with the negative electrode of second direct current capacitors, the battery；The emitter stage of the 3rd gate-controlled switch device is complete as class
The positive terminal of bridge energy storage submodule；The emitter stage of the 5th gate-controlled switch device is connected and made with one end of the power sense cell
For the negative pole end of class full-bridge energy storage submodule；The other end of the power sense cell is connected with the anode of the battery；Described 3rd
Gate-controlled switch device, the 4th gate-controlled switch device, the 5th gate-controlled switch device, the 6th gate-controlled switch device
Grid is connected with control circuit.
Compared with prior art, the present invention has following beneficial effect：
Modular multi-level converter of the present invention with energy-storage function is simple in construction, passes through class full-bridge energy storage submodule
Design, is new energy resources system increase inertia, and the battery charging and discharging electric current used in energy storage is smooth, and voltage class is relatively low, ensures
The Effec-tive Function and security of battery.
Brief description of the drawings
By reading the detailed description made with reference to the following drawings to non-limiting example, further feature of the invention,
Objects and advantages will become more apparent upon：
Fig. 1 is the topological diagram of one embodiment of the present invention；
Fig. 2 is the half-bridge submodular circuits figure of one embodiment of the present invention；
Fig. 3 is the class full-bridge energy storage submodular circuits figure of one embodiment of the present invention；
A, b, c, d are respectively the nominal situation half-bridge submodule of one embodiment of the present invention, class full-bridge submodule in Fig. 4
Modulating wave and total equivalent output voltage schematic diagram；
In Fig. 5 a, b, c be respectively one embodiment of the present invention nominal situation under bridge arm current, half-bridge submodule it is equivalent
Output voltage and half-bridge submodule power pulsations situation schematic diagram；
In Fig. 6 a, b, c be respectively one embodiment of the present invention nominal situation under bridge arm current, class full-bridge energy storage submodule
The equivalent output voltage of block and class full-bridge energy storage submodule power pulsations situation schematic diagram.
Embodiment
With reference to specific embodiment, the present invention is described in detail.Following examples will be helpful to the technology of this area
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that to the ordinary skill of this area
For personnel, without departing from the inventive concept of the premise, various modifications and improvements can be made.These belong to the present invention
Protection domain.
As shown in figure 1, a kind of modular multi-level converter topology with energy-storage function, including three facies units；Often
Individual facies unit x (x=a, b, c) includes upper bridge arm, lower bridge arm, upper bridge arm inductance Lxp, lower bridge arm inductance Lxn；Wherein：
The positive terminal of the upper bridge arm as facies unit direct current outlet positive terminal；The negative pole end of the upper bridge arm with it is described
Upper bridge arm inductance LxpOne end be connected；The upper bridge arm inductance LxpThe other end and the lower bridge arm inductance LxnOne end be connected,
As the exchange leading-out terminal of facies unit, its voltage is Vx, and current-limiting reactor LTxPower network is connected to, its voltage is Vsx；Under described
Bridge arm inductance LxnThe other end be connected with the positive terminal of the lower bridge arm；The negative pole end of the lower bridge arm as facies unit direct current
Outlet negative pole end；
Upper bridge arm, lower bridge arm in three facies units are gone here and there by half-bridge submodule and the mixing of class full-bridge energy storage submodule
Connection is formed；Submodule xyi (x=a, b, c；Y=p, n；On i=1,2 ... N, wherein p representatives, under n is represented) represent x phase y bridge arms
I-th of submodule.ixRefer to x cross streams side electric current, ixyRefer to the electric current of x phase y bridge arms, VxyRefer to all submodule outputs of x phase y bridge arms
Voltage and, IdRefer to DC side electric current, VdcRefer to DC voltage.
As one preferred embodiment, as shown in Fig. 2 described half-bridge submodule, including：First direct current capacitors
C1, the first gate-controlled switch device S1, the second gate-controlled switch device S2, and the first sustained diode 1, the second fly-wheel diode
D2；Wherein：
The colelctor electrode of the first gate-controlled switch device S1, the second gate-controlled switch device S2 colelctor electrode respectively with institute
The negative electrode of the first sustained diode 1, the negative electrode of second sustained diode 2 is stated to be connected；The first gate-controlled switch device
S1 emitter stage, the emitter stage anode respectively with first sustained diode 1 of the second gate-controlled switch device S2, institute
The anode for stating the second sustained diode 2 is connected；The colelctor electrode of the first gate-controlled switch device S1 also with first direct current
Container C1 anode is connected；Negative electrode of the emitter stage of the second gate-controlled switch device S1 also with the first direct current capacitors C1
It is connected；The grid of the first gate-controlled switch device S1, the second gate-controlled switch device S2 grid are connected with control circuit.
As one preferred embodiment, as shown in figure 3, described class full-bridge energy storage submodule, including：Second direct current
Container C2, battery, power sense cell L, the 3rd gate-controlled switch device S3, the 4th gate-controlled switch device S4, the 5th gate-controlled switch device
S5, the 6th gate-controlled switch device S6, and the 3rd sustained diode 3, the 4th fly-wheel diode (D4), the 5th fly-wheel diode
D5, the 6th sustained diode 6；Wherein：
The colelctor electrode of the 3rd gate-controlled switch device S3, the colelctor electrode of the 4th gate-controlled switch device S4, described
Five gate-controlled switch device S5 colelctor electrode, the 6th gate-controlled switch device S6 colelctor electrode respectively with the pole of the 3rd afterflow two
Pipe D3 negative electrode, the negative electrode of the 4th sustained diode 4, the negative electrode of the 5th sustained diode 5, the 6th afterflow
Diode D6 negative electrode is connected；Emitter stage, the hair of the 4th gate-controlled switch device S4 of the 3rd gate-controlled switch device S3
Emitter-base bandgap grading, the emitter stage of the 5th gate-controlled switch device S5, the 6th gate-controlled switch device S6 emitter stage respectively with it is described
The anode of 3rd sustained diode 3, the anode of the 4th sustained diode 4, the anode of the 5th sustained diode 5,
The anode of 6th sustained diode 6 is connected；The colelctor electrode of the 3rd gate-controlled switch device S3 also with second direct current
Capacitor C2 anode is connected；The moon of the emitter stage of the 4th gate-controlled switch device S4 also with the second direct current capacitors C2
Pole, the negative electrode of the battery are connected；The emitter stage of the 3rd gate-controlled switch device S3 is also as the class full-bridge energy storage submodule
The positive terminal of block；The emitter stage of the 5th gate-controlled switch device S5 is also connected and as institute with one end of the power sense cell L
State the negative pole end of class full-bridge energy storage submodule；The other end of the power sense cell L is connected with the anode of the battery；Described 3rd
Gate-controlled switch device S3 grid, the grid of the 4th gate-controlled switch device S4, the grid of the 5th gate-controlled switch device S5
Pole, the grid of the 6th gate-controlled switch device S6 are connected with control circuit.
As shown in a, b, c, d in Fig. 4, lower bridge arm half-bridge submodule, class full-bridge energy storage of a respectively preferred embodiment
The modulating wave of module and total equivalent output voltage schematic diagram；Note modulating wave is that sinusoidal bridge arm is MMC bridge arms (in such as Fig. 4 (c)
It is shown), modulating wave is that the bridge arm of direct current is energy storage bridge arm (in such as Fig. 4 shown in (d))；Wherein：mdc-HB、mac-HBRespectively half-bridge
The DC component of pipe modulation ratio and AC compounent peak value, m on submoduledc-FB, mac-FBRespectively class full-bridge energy storage submodule MMC
The DC component of pipe modulation ratio and AC compounent peak value, m on bridge armbFor the modulation ratio of class full-bridge energy storage submodule energy storage bridge arm；
AC compounent with biasing is exported by half-bridge submodule and class full-bridge energy storage submodule jointly, DC voltage can be supported(phase voltage peak value is V with alternating voltages)。
As shown in a, b, c in Fig. 5, bridge arm current, the equivalent output voltage of half-bridge submodule and half-bridge submodule are respectively descended
Power pulsations situation schematic diagram；DC component is in lower bridge arm currentAC compounent isVcFor the direct current of capacitance voltage
Average.By figure observe it can be found that choose suitable modulation ratio can allow half-bridge submodule power swing in a power frequency
Cycle inner equilibrium, so that half-bridge submodule steady operation.
As shown in a, b, c in Fig. 6, respectively descend bridge arm current, the class equivalent output voltage of full-bridge energy storage submodule and class complete
Bridge energy storage submodule power pulsations situation schematic diagram；DC component is in lower bridge arm currentAC compounent peak value isVc
For the direct current average of capacitance voltage.Observed by figure it can be found that class full-bridge energy storage submodule can be allowed by choosing suitable modulation ratio
Average value of the power swing of block in a power frequency period is equal to the power of battery storage or release, so that the energy storage of class full-bridge is sub
Module stability works.
The specific embodiment of the present invention is described above.It is to be appreciated that the invention is not limited in above-mentioned
Particular implementation, those skilled in the art can make various deformations or amendments within the scope of the claims, this not shadow
Ring the substantive content of the present invention.
Claims (4)
1. a kind of modular multi-level converter topology with energy-storage function, it is characterised in that：Including three facies units, each
Facies unit includes upper bridge arm, lower bridge arm, upper bridge arm inductance, lower bridge arm inductance；Wherein：
The positive terminal of the upper bridge arm as facies unit direct current outlet positive terminal；The negative pole end of the upper bridge arm and the upper bridge
One end of arm inductance is connected；The other end of the upper bridge arm inductance is connected with one end of the lower bridge arm inductance, is used as facies unit
Exchange leading-out terminal, and current-limiting reactor is connected to power network；The other end of the lower bridge arm inductance and the positive pole of the lower bridge arm
End is connected；The negative pole end of the lower bridge arm as facies unit direct current outlet negative pole end；The upper bridge arm in three facies units,
The lower bridge arm is in series by half-bridge submodule and the mixing of class full-bridge energy storage submodule.
2. the modular multi-level converter topology according to claim 1 with energy-storage function, it is characterised in that：It is described
Three facies units in：
The quantity of half-bridge submodule in the upper bridge arm is identical with the quantity of the half-bridge submodule in the lower bridge arm；
The quantity of class full-bridge energy storage submodule in the upper bridge arm and the number of the class full-bridge energy storage submodule in the lower bridge arm
Amount is identical.
3. the topology of the modular multi-level converter with energy-storage function according to claim any one of 1-2, its feature
It is：Described half-bridge submodule, including：First direct current capacitors, the first gate-controlled switch device, the second gate-controlled switch device,
And first fly-wheel diode, the second fly-wheel diode；Wherein：
The first gate-controlled switch device, the second gate-controlled switch device colelctor electrode respectively with the pole of the first afterflow two
Pipe, the negative electrode of second fly-wheel diode are connected；The first gate-controlled switch device, the hair of the second gate-controlled switch device
Anode of the emitter-base bandgap grading respectively with first fly-wheel diode, second fly-wheel diode is connected；The first gate-controlled switch device
The colelctor electrode of part is connected with the anode of first direct current capacitors；The emitter stage of the second gate-controlled switch device and described the
The negative electrode of one direct current capacitors is connected；First controllable devices, the grid of the second controllable devices are connected with control circuit.
4. the topology of the modular multi-level converter with energy-storage function according to claim any one of 1-2, its feature
It is：Described class full-bridge energy storage submodule, including：Second direct current capacitors, battery, power sense cell, the 3rd gate-controlled switch device
Part, the 4th gate-controlled switch device, the 5th gate-controlled switch device, the 6th gate-controlled switch device, and the 3rd fly-wheel diode, the 4th
Fly-wheel diode, the 5th fly-wheel diode, the 6th fly-wheel diode；Wherein：
The 3rd gate-controlled switch device, the 4th gate-controlled switch device, the 5th gate-controlled switch device, the described 6th can
Control switching device colelctor electrode respectively with the 3rd fly-wheel diode, the 4th fly-wheel diode, the 5th afterflow two
Pole pipe, the negative electrode of the 6th fly-wheel diode are connected；The 3rd gate-controlled switch device, the 4th gate-controlled switch device,
The 5th gate-controlled switch device, the 6th gate-controlled switch device emitter stage respectively with the 3rd fly-wheel diode, institute
The 4th fly-wheel diode, the 5th fly-wheel diode, the anode of the 6th fly-wheel diode is stated to be connected；Described 3rd is controllable
The colelctor electrode of switching device is connected with the anode of second direct current capacitors；The emitter stage of the 4th gate-controlled switch device with
Second direct current capacitors, the negative electrode of the battery are connected；The emitter stage of the 3rd gate-controlled switch device is used as class full-bridge
The positive terminal of energy storage submodule；The emitter stage of the 5th gate-controlled switch device is connected and conduct with one end of the power sense cell
The negative pole end of class full-bridge energy storage submodule；The other end of the power sense cell is connected with the anode of the battery；Described 3rd can
Control switching device, the 4th gate-controlled switch device, the 5th gate-controlled switch device, the grid of the 6th gate-controlled switch device
Extremely it is connected with control circuit.
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| CN201710199581.XA CN107017798B (en) | 2017-03-30 | 2017-03-30 | A kind of modular multi-level converter topology with energy-storage function |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112615388A (en) * | 2020-12-15 | 2021-04-06 | 国网湖北省电力有限公司电力科学研究院 | Medium-high voltage power supply quality unified regulator containing distributed energy storage units |
| WO2024051217A1 (en) * | 2022-09-06 | 2024-03-14 | 南方电网调峰调频发电有限公司储能科研院 | Battery energy storage circuit and system |
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| CN102969730A (en) * | 2012-11-16 | 2013-03-13 | 上海交通大学 | Control method of double stage chain type energy storage converter |
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| CN112615388A (en) * | 2020-12-15 | 2021-04-06 | 国网湖北省电力有限公司电力科学研究院 | Medium-high voltage power supply quality unified regulator containing distributed energy storage units |
| WO2024051217A1 (en) * | 2022-09-06 | 2024-03-14 | 南方电网调峰调频发电有限公司储能科研院 | Battery energy storage circuit and system |
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| Publication number | Publication date |
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| CN107017798B (en) | 2019-06-07 |
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