CN110247421A - A kind of double active bridge converter systems of modularization and electrical balanced amount control method - Google Patents
A kind of double active bridge converter systems of modularization and electrical balanced amount control method Download PDFInfo
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- CN110247421A CN110247421A CN201910107015.0A CN201910107015A CN110247421A CN 110247421 A CN110247421 A CN 110247421A CN 201910107015 A CN201910107015 A CN 201910107015A CN 110247421 A CN110247421 A CN 110247421A
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- 230000000694 effects Effects 0.000 description 2
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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
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
-
- H02J3/386—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a kind of double active bridge converter systems of modularization, it include left part, intermediate member and right part, the intermediate member is electrically connected with left part, the right part is electrically connected with intermediate member, the left part includes several DC/AC inverters, the input terminal of several DC/AC inverters is successively in parallel, the intermediate member includes several medium/high frequency transformers, the right part includes several AC/DC rectifiers, the output end of several AC/DC rectifiers is sequentially connected in series, one DC/AC inverter, one medium/high frequency transformer and an AC/DC rectifier constitute one group of double active bridge current transformer mould group.Information using the technical solution without intermodule communicates, and can be achieved with the Balance route containing the series-parallel combined system compared with multimode, and the voltage dynamic response of the serial connection port of modules is able to maintain the stable operation for being unanimously conducive to entire combined system.
Description
Technical field
The invention belongs to the control technology fields of the double active bridge current transformers of modularization, and in particular to a kind of modularization is double active
Bridge converter system and electrical balanced amount control method.
Background technique
The structural schematic diagrams of the double active bridge current transformers of modularization as shown in Figure 1, it by multiple identical double active bridging streams
Device is cascaded as basic module and is constituted, and using being connected in parallel, another side ports are successively connected a side ports of each module using series connection
It connects, the conversion between the DC voltage of different voltages grade may be implemented in the double active bridge current transformers of modularization, and has power
The characteristics of two-way flow and two sides electrical isolation.
According to the structure of the double active bridge current transformers of modularization, the port voltage in parallel of each basic module is equal, serial connection port
Electric current is equal.For the equilibrium for realizing each modular electrical amount, needs to increase Balance route and enable the electric current of port in parallel of substantially equal, or
Person enables the voltage of serial connection port of substantially equal, and existing balance control method needs the information of intermodule to communicate more, which increase
System cost and reduce reliability；Another traditional balance control method is the wattful power by finely tuning modules
Rate controls the voltage of its port in parallel near rated value using a module, remaining module controls its respective serial connection port
Voltage basis equalization；This balance control method is in the double active bridge current transformers of the less modularization of number of modules using more wide
It is general, and communicated independent of the information of intermodule, still, when number of modules significantly increases, only controlled with a module a large amount of
The voltage of the port in parallel of wired in parallel connection becomes more difficult, so that the significant effect of Balance route declines, thus it is existing
Some balance control methods still cannot be under conditions of the information of no intermodule communicates, and realizing that the more modularization of number of modules is double has
The modular electrical amount Balance route of source bridge current transformer.
Summary of the invention
The condition that cannot be communicated in the information of no intermodule it is an object of the invention to solve existing balance control method
Under, the shortcomings that realizing the modular electrical amount Balance route technology of the double active bridge current transformers of the more modularization of number of modules, provide one
The intermodule electrical quantity balance control method of the double active bridge current transformers of kind modularization, one of them double active bridge current transformer is as one
The structure and parameter of a module and modules is essentially identical, and a side ports (such as input port) for module are in parallel, another
Side ports (such as output port) combined system as shown in Figure 1 in series, by the active power to each module transfer into
Row active control realizes the current balance of modules parallel connection port and the electric voltage equalization of block coupled in series port.
To realize the above-mentioned technical purpose, a kind of technical solution provided by the invention is a kind of double active bridging streams of modularization
Device system includes left part, intermediate member and right part, and the intermediate member is electrically connected with left part, described
Right part is electrically connected with intermediate member, and the left part includes several DC/AC inverters, and several DC/AC are inverse
The input terminal for becoming device is successively in parallel, and the intermediate member includes several medium/high frequency transformers, if the right part includes
The output end of dry platform AC/DC rectifier, several AC/DC rectifiers is sequentially connected in series, a DC/AC inverter, in one
High frequency transformer and an AC/DC rectifier constitute one group of double active bridge current transformer mould group.
In the present solution, the left side of the double active bridge converter systems of modularization is electrically connected with a DC equipment, the direct current
Equipment can be DC power supply, DC load or vacant, DC power supply such as photovoltaic cell power supply, energy storage battery or alternating current generator
Add generator terminal AC/DC rectifier.Double active bridge current transformers are essentially identical as the structure and parameter of a module and modules,
In parallel, another side ports (such as output port) group as shown in Figure 1 in series by a side ports (such as input port) for module
Collaboration system carries out active control by the active power to each module transfer, realizes that the electric current of modules parallel connection port is equal
Weighing apparatus and the electric voltage equalization of block coupled in series port.
One generator terminal AC/DC rectifier is parallel with a filter capacitor.
The output end of one AC/DC rectifier is parallel with a filter capacitor.
The quantity of the DC equipment, generator terminal AC/DC rectifier and double active bridge current transformers is equal.
The generator terminal AC/DC rectifier, DC/AC inverter, AC/DC rectifier and power grid end DC/AC inverter are equal
For six bridge arm structure of three-phase.
A kind of intermodule electrical quantity balance control method of the active bridge current transformers of modularization pair is suitable for a kind of module
Change double active bridge converter systems, in parallel, the concatenated block combiner system of output port or input port for input port
The double active bridge current transformers of modularization of series connection, output port parallel connection.Each module transfer active power command value (or with it is active
The instruction value of the control amount of power correlation) it is determined by following ratio-integration control rule:
P*=kp'e+ki'∫edt；
Wherein kp' and ki' is respectively the proportionality coefficient and integral coefficient being based in the Balance route of ratio-integral (PI), than
Example-integration control belongs to the prior art, and the selection of proportionality coefficient and integral coefficient has the method for several maturations, as step is rung
Ying Fa, critical proportional band law etc.；E is error signal, and the error signal e is chosen as follows:
Wherein ka and kb is respectively two constants, and between 0.3-0.7, corresponding kb's takes the empirical value value range of coefficient k a
Value is (1-ka), and Uot and Uot* are the virtual voltage and voltage rating of the serial connection port of t-th of module respectively；Ui and Ui* difference
It is the virtual voltage and voltage rating of the port in parallel of t-th of module (input terminal is in parallel)；Product in ratio-integration control
Divide under the continuous action of link, the numerical value of error signal e will be controlled in zero, and expression formula is as follows:
There is following relationship in the steady state in the voltage of modules serial connection port and the voltage of port in parallel:
In the present solution, the balance control method not only on the right side of power is flowed to by left side when it is effective, but also in power by the right side
Similarly effective when lateral left side flowing, there are same ratio passes for the serial connection port voltage of modules and port voltage in parallel
System, the voltage of the serial connection port of modules can keep in balance under Balance route effect；Due to the serial connection port of module
Electric current is always equal, and the voltage of the serial connection port of modules, which is kept in balance, illustrates that the power of modules is also to keep in balance
's.It is noted that the Balance route of each module is identical, it can be ensured that each module under balance control method of the invention
Dynamic response it is almost the same.
Beneficial effects of the present invention: a kind of double active bridge converter systems of modularization proposed by the present invention and electrical equilibrium quantity
Control method, the information without intermodule communicate, and can be achieved with the Balance route containing the series-parallel combined system compared with multimode,
And the voltage dynamic response of the serial connection port of modules is able to maintain unanimously, and be conducive to entire combined system stablizes fortune
Row.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the double active bridge current transformers of modularization.
Fig. 2 is a kind of double active bridge current transformer system structure diagrams of modularization of the present invention.
Fig. 3 is shown using the response wave shape of the electrical double active bridge current transformers of modularization of balanced amount control method of conventional module
It is intended to one.
Fig. 4 is shown using the response wave shape of the electrical double active bridge current transformers of modularization of balanced amount control method of conventional module
It is intended to two.
Fig. 5 is the response wave shape using the double active bridge current transformers of modularization of modular electrical equilibrium amount control method of the present invention
Schematic diagram one.
Fig. 6 is the response wave shape using the double active bridge current transformers of modularization of modular electrical equilibrium amount control method of the present invention
Schematic diagram two.
Description of symbols in figure: 1- wind-driven generator, 2- generator terminal AC/DC rectifier, the double active bridge current transformers of 3- modularization, 4-
Power grid end DC/AC inverter, 31 left parts, 32- intermediate member, 33- right part.
Specific embodiment
It is right with reference to the accompanying drawings and examples for the purpose of the present invention, technical solution and advantage is more clearly understood
The present invention is described in further detail, it should be appreciated that the specific embodiments described herein are only one kind of the invention
Most preferred embodiment, only to explain the present invention, and the scope of protection of the present invention is not limited, and those of ordinary skill in the art are not having
Every other embodiment obtained under the premise of creative work is made, shall fall within the protection scope of the present invention.
Embodiment: the double active bridge converter systems of a kind of modularization as shown in Figure 1:, include left part 31, middle part
Part 32 and right part 33, the intermediate member 32 are electrically connected with left part 31, the right part 33 and intermediate member
32 electrical connections, the left part 31 include several DC/AC inverters, the input terminals of several DC/AC inverters according to
Secondary parallel connection, the intermediate member 32 include several medium/high frequency transformers, and the right part 33 includes several AC/DC whole
Flow device, the output end of several AC/DC rectifiers is sequentially connected in series, a DC/AC inverter, a medium/high frequency transformer with
And an AC/DC rectifier constitutes one group of double active bridge current transformer mould group.
As shown in Fig. 2, a kind of for the double active bridge converter systems of wind farm grid-connected modularization, 20 typhoon power generators
1 and the double active bridge current transformers 3 of modularization；Every typhoon power generator 1 is respectively connected with a generator terminal AC/DC rectifier 2, AC/
DC rectifier is six bridge arm structure of three-phase；The DC output end of AC/DC inverter is connected to a double active bridge current transformer
(Dual-Active-Bridge Converter)；The left part 31 of one double active bridge current transformer is a DC/AC inversion
Device, right part 33 are an AC/DC rectifier, are six bridge arm structure of three-phase, the middle part of a double active bridge current transformers
Part 32 is intermediate frequency or high frequency transformer；Basic module of double active bridge current transformers as the double active bridge current transformers 3 of modularization, it is left
Side ports are in parallel, and right side port is sequentially connected in series, and the output end of double active bridge current transformers passes through cable and power grid end DC/AC inverter
The electrical connection of 4 input terminals, the output end of the DC/AC inverter 4 are electrically connected with AC network end.
The inverter of double active bridge current transformers is controlled using common vector current, by the active power of inverter and idle
Power control is in instruction value；The rectifier of double active bridge current transformers is controlled using common vector current or direct voltage control,
The alternating voltage of rectifier exchange side is controlled in instruction value, the control method of double active bridge current transformers belongs to prior art, mould
The intermodule electrical quantity balance control method of the double active bridge current transformers 3 of blockization uses method proposed by the present invention, i.e., each pair has
For the active power command value of inverter using the instruction value in the present invention, reactive power command value is optional in the bridge converter module of source
Take 0；The alternating voltage instruction value of rectifier can choose rated value in each module.
Active power command value (or the instruction with the control amount of active power correlation of each module transfer
Value) it is determined by following ratio-integration control rule:
P*=kp'e+ki'∫edt；
Wherein kp' and ki' is respectively the proportionality coefficient and integral coefficient being based in the Balance route of ratio-integral (PI), than
Example-integration control belongs to the prior art, and the selection of proportionality coefficient and integral coefficient has the method for several maturations, as step is rung
Ying Fa, critical proportional band law etc.；E is error signal, and the error signal e is chosen as follows:
Wherein ka and kb is respectively two constants, and between 0.3-0.7, corresponding kb's takes the empirical value value range of coefficient k a
Value is (1-ka), and Uot and Uot* are the virtual voltage and voltage rating of the serial connection port of t-th of module respectively；Ui and Ui* difference
Be module t-th (input terminal in parallel) port in parallel virtual voltage and voltage rating；Product in ratio-integration control
Divide under the continuous action of link, the numerical value of error signal e will be controlled in zero, and expression formula is as follows:
There is following relationship in the steady state in the voltage of modules serial connection port and the voltage of port in parallel:
For the dynamic response of test macro, it is 4 groups that 20 typhoon power generators 1, which are divided, wherein first 3 groups respectively have wind-driven generator
1, the wind velocity condition of wind-driven generator 1 and the wind power of generation in every group are equal；4th group is only had 2 typhoon power generators
1, and all in shutdown status, do not generate wind power.In this way, the wind-driven generator 1 in the test macro generates at power
In non-equilibrium state, the double active bridge current transformers 3 of the modularization that can be used to test under different module balance control methods
Dynamic response.
Fig. 3 and Fig. 4 show the response wave of the double active bridge current transformers of modularization using conventional module balance control method
Shape schematic diagram, wherein the 1st typhoon power generator 1 is used to control the voltage of port in parallel, remaining wind-driven generator 1 is for controlling string
Join the voltage of port.Fig. 3 (a) is the power that the 1st typhoon power generator 1 in preceding 3 groups of wind-driven generators 1 generates, and Fig. 3 (b) is
The port voltage in parallel of each module, Fig. 3 (c) are the serial connection port voltage of each module, and Fig. 3 (d) is having for entire wind power plant generation
Function power.Fig. 4 (a), (b), (c) and (d) are the power point of each module in the 1st group, the 2nd group, the 3rd group and the 4th group respectively
Cloth situation.From system response it can be found that the 1st typhoon power generator 1, that is, control the wind-driven generator 1 of port voltage in parallel
The dynamic response difference of dynamic response and remaining wind-driven generator 1 is larger, this illustrates that traditional balance control method is not appropriate for using
In containing the double active bridge current transformers 3 of number of modules more modularization.
Fig. 5 and Fig. 6 show the sound of the double active bridge current transformers of modularization using module balance control method of the invention
Answer waveform diagram.Every typhoon power generator 1 all uses identical balance control method, participates in port voltage in parallel and series connection end
The control of mouth voltage.Fig. 5 (a) is the power that the 1st typhoon power generator 1 in preceding 3 groups of wind-driven generators 1 generates, and Fig. 5 (b) is
The port voltage in parallel of each module, Fig. 5 (c) are the serial connection port voltage of each module, and Fig. 5 (d) is having for entire wind power plant generation
Function power.Fig. 6 (a), (b), (c) and (d) are the power point of each module in the 1st group, the 2nd group, the 3rd group and the 4th group respectively
Cloth situation.From system response it can be found that under the conditions of identical wind power, the voltage and power of every typhoon power generator 1
Dynamic response consistency is preferable, this illustrates that balance control method of the invention can preferably realize the double active bridging streams of modularization
The Balance route of the intermodule electrical quantity of device 3, and this control method is not necessarily to the communication of intermodule.
It should be noted that term " left side ", " centre ", " the right " in specification, etc. indicating positions or positional relationship
To be based on the orientation or positional relationship shown in the drawings, rather than device or element shown in indication or suggestion must have it is specific
Orientation or position, therefore be not considered as limiting the invention.
The specific embodiment of the above is a kind of double active bridge converter systems of modularization of the present invention and electrical equilibrium
The better embodiment of amount control method, limits specific implementation range of the invention not with this, and the scope of the present invention includes simultaneously
It is not limited to present embodiment, equivalence changes made by all shape, structures according to the present invention are in protection model of the invention
In enclosing.
Claims (5)
1. a kind of double active bridge converter systems of modularization, it is characterised in that: include left part (31), intermediate member (32)
And right part (33), the intermediate member (32) are electrically connected with left part (31), the right part (33) and centre
Component (32) electrical connection, the left part (31) includes several DC/AC inverters, several DC/AC inverters
Input terminal is successively in parallel, and the intermediate member (32) includes several medium/high frequency transformers, and the right part (33) includes
The output end of several AC/DC rectifiers, several AC/DC rectifiers is sequentially connected in series, a DC/AC inverter, one
Medium/high frequency transformer and an AC/DC rectifier constitute one group of double active bridge current transformer mould group.
2. a kind of double active bridge converter systems of modularization according to claim 1, it is characterised in that: a machine
End AC/DC rectifier is parallel with a filter capacitor.
3. a kind of double active bridge converter systems of modularization according to claim 2, it is characterised in that: described one
The input terminal of DC/AC inverter is parallel with a filter capacitor.
4. a kind of double active bridge converter systems of modularization according to claim 3, it is characterised in that: the DC/AC is inverse
Become device and AC/DC rectifier is six bridge arm structure of three-phase.
5. a kind of intermodule electrical quantity balance control method of the double active bridge current transformers of modularization is suitable for as described in claim 1
A kind of double active bridge converter systems of modularization, it is characterised in that: the active power command value of each module transfer by comparing below
Example-integration control rule determines:
P*=kp'e+ki'∫edt；
Wherein kp' and ki' is respectively the proportionality coefficient and integral coefficient being based in the control of ratio-integral, and e is error signal,
The error signal e is chosen as follows:
Wherein ka and kb is respectively two constants, and between 0.3-0.7, corresponding kb's takes the empirical value value range of coefficient k a
Value is (1-ka), and Uot and Uot* are the virtual voltage and voltage rating of the serial connection port of t-th of module respectively；Ui and Ui* difference
It is the virtual voltage and voltage rating of the port in parallel of t-th of module (input terminal is in parallel)；
Under the continuous action of the integral element in ratio-integration control, the numerical value of error signal e will be controlled in zero, expression
Formula is as follows:
There is following relationship in the steady state in the voltage of modules serial connection port and the voltage of port in parallel:
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| CN111628490A (en) * | 2020-04-01 | 2020-09-04 | 国网浙江省电力有限公司湖州供电公司 | Direct current transformer substation based on modularized double-active-bridge converter |
| EP3879663A1 (en) * | 2020-03-09 | 2021-09-15 | Delta Electronics (Shanghai) Co., Ltd. | Energy storage device and power system and control method thereof |
| CN115800766A (en) * | 2023-01-30 | 2023-03-14 | 广东电网有限责任公司肇庆供电局 | Model reference self-adaptive control method and device based on double-active-bridge converter |
| US11799293B2 (en) | 2020-03-09 | 2023-10-24 | Delta Electronics (Shanghai) Co., Ltd. | High-voltage DC transformation apparatus and power system and control method thereof |
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| CN108494259A (en) * | 2018-03-30 | 2018-09-04 | 大连理工大学 | A kind of control method of high-voltage DC power supply connection in series-parallel combined system |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3879663A1 (en) * | 2020-03-09 | 2021-09-15 | Delta Electronics (Shanghai) Co., Ltd. | Energy storage device and power system and control method thereof |
| US11239663B2 (en) | 2020-03-09 | 2022-02-01 | Delta Electronics (Shanghai) Co., Ltd. | Energy storage device and power system and control method thereof |
| US11799293B2 (en) | 2020-03-09 | 2023-10-24 | Delta Electronics (Shanghai) Co., Ltd. | High-voltage DC transformation apparatus and power system and control method thereof |
| CN111628490A (en) * | 2020-04-01 | 2020-09-04 | 国网浙江省电力有限公司湖州供电公司 | Direct current transformer substation based on modularized double-active-bridge converter |
| CN115800766A (en) * | 2023-01-30 | 2023-03-14 | 广东电网有限责任公司肇庆供电局 | Model reference self-adaptive control method and device based on double-active-bridge converter |
| CN115800766B (en) * | 2023-01-30 | 2023-05-05 | 广东电网有限责任公司肇庆供电局 | Model reference self-adaptive control method and device based on double active bridge converters |
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| CN110247421B (en) | 2020-09-22 |
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