CN109687514A - The more low-voltage direct buses of high-frequency isolation type, which collect, presses grid-connected system in photovoltaic - Google Patents
The more low-voltage direct buses of high-frequency isolation type, which collect, presses grid-connected system in photovoltaic Download PDFInfo
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- CN109687514A CN109687514A CN201811625318.3A CN201811625318A CN109687514A CN 109687514 A CN109687514 A CN 109687514A CN 201811625318 A CN201811625318 A CN 201811625318A CN 109687514 A CN109687514 A CN 109687514A
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- 239000003990 capacitor Substances 0.000 claims abstract description 30
- 238000003491 array Methods 0.000 claims abstract description 8
- 210000003850 cellular structure Anatomy 0.000 claims abstract description 8
- 238000006243 chemical reaction Methods 0.000 claims description 12
- 230000007935 neutral effect Effects 0.000 claims description 5
- 230000008859 change Effects 0.000 claims description 3
- 230000005611 electricity Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000010248 power generation Methods 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- 210000004027 cell Anatomy 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
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- 238000005859 coupling reaction Methods 0.000 description 1
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Classifications
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- H02J3/383—
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- H02J3/385—
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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
- 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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
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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
- 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
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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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/60—Planning or developing urban green infrastructure
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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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
Abstract
Collect the invention discloses the more low-voltage direct buses of high-frequency isolation type and presses grid-connected system in photovoltaic, the array of centralized photovoltaic cell component including multiple arrays, each centralization photovoltaic cell component is connected in parallel with the isolated form modularization cascaded converter modules group for corresponding to three-phase.The invention has the advantages that the problem of leading to three-phase power imbalance there is no local shades；Realize independent MPPT control, generating efficiency is improved；DC voltage is reduced, the stability and safety of system are enhanced；The system expandability and redundant ability improve；The fluctuation of low-voltage direct bus junction independent capacitance secondary power is eliminate or reduced, to greatly reduce the volume of low-voltage direct bus junction separate capacitors.
Description
Technical field
The present invention relates to grid-connected photovoltaic system fields, and in particular to a kind of more low-voltage direct buses remittances of high-frequency isolation type
Collect grid-connected photovoltaic system.
Background technique
Fossil energy exhaustion and problem of environmental pollution it is increasingly serious, make people for the renewable energy of cleanliness without any pollution
Exploitation it is more urgent.Solar energy is due to its rich reserves, widely distributed and advantages of environment protection, so that photovoltaic
Power generation becomes ideal scheme.How to improve solar energy utilization rate and reduce photovoltaic power generating system device overall volume be at present urgently
Problem to be solved.
Usual grid-connected power generation system unit passes through voltage converter and installs low pressure Industrial Frequency Transformer additional to generate the phase
The grid-connected voltage (6~36kV) of prestige is pooled to middle pressure AC network, boosts to high-voltage alternating net finally by middle pressure transformer and sends outside
To distal end load center.The problems such as prime Industrial Frequency Transformer is big with spatial volume there are quality weight, increases cost of investment and peace
Dress expense, cost of installation and maintenance problem will be protruded more when especially at sea generating field and remote districts are applied.Therefore, lead to
It crosses and removes prime step-up transformer to inquire into how to realize no power frequency transformation the problems such as solving weight, volume and maintenance cost
Pressure grid-connected system is had broad application prospects by countries in the world scholar's extensive concern in device new energy flexibility.
As shown in Figure 1, stage type cascade connection type system is by high-frequency isolation type DC-DC converter (PSFB converter, DAB
Converter, LLC resonant converter etc.) one or several common low-voltage direct side energy transmissions are independent to each phase concatenation unit
DC side, each phase DC-AC unit (H bridge type, NPC type, mixed type etc.) is generated electricity by way of merging two or more grid systems by pressing in series boosting realization, to keep away
Exempt from the use of front end Industrial Frequency Transformer.Grid-connected system is pressed to have the following problems in stage type photovoltaic:
1. since the intrinsic secondary power fluctuation problem of monophase system makes each phase concatenation unit intermediate dc side needs larger
Capacitor reaches pressure stabilizing purpose to buffer instantaneous power imbalance, so as to cause system bulk increase.
2. larger voltage class in order to obtain, stage type isolated form power conversion unit is in parallel using input, output is connected
System topology realize, bring complicated pressure and two problems of stream.This requires the systems to realize hiigh pressure stage friendship
Galvanic electricity flow control and the control of low-pressure stage public direct-current voltage are simultaneously, it is necessary to internal a large amount of stage type isolated form AC-DC modules
It is pressed and sharing control, needs just to be able to achieve by the coordination closed-loop control of multimode.As system module number increases, respectively
The coordinated control of module closed loop will face very big challenge, especially under the conditions of system exception, complicated operation and Fault Control plan
Slightly reduce system reliability.
Summary of the invention
It is pressed simultaneously to solve the above problems, collecting in photovoltaic the present invention provides a kind of more low-voltage direct buses of high-frequency isolation type
Net power generation system structure.Press grid-connected system structure that there is the frequency conversion ability of high-voltage large-capacity, output voltage wave in the photovoltaic
Shape harmonic content is small, be easy to modularization extension, each module high voltage side no longer needs capacitor to support and Pressure and Control, do not need transformation
Device can be directly accessed the advantages that high-voltage fence, while also solve the change of current of traditional single stage formula converter secondary side, due to voltage spikes
The problems such as, the power conversion that is able to achieve between low-voltage direct, high-voltage alternating.This structure can reduce or eliminate DC bus and collect
The secondary power fluctuation for locating independent capacitance, to reduce the volume of DC bus junction capacitor.As connection photovoltaic array
Core apparatus between power grid, photovoltaic combining inverter will not only realize straight friendship mapping function, should also keep DC voltage
Stablize, meet the functions such as grid-connected current sine exports and realization unity power factor is grid-connected.
In order to solve the above-mentioned technical problem, the present invention is achieved by the following technical solutions: the more low pressure of high-frequency isolation type
DC bus, which collects, presses grid-connected system in photovoltaic, the centralized photovoltaic cell component including multiple arrays, each centralization
The array of photovoltaic cell component is connected in parallel with the isolated form modularization cascaded converter modules group for corresponding to three-phase.
The advantages of structure, is: the problem of leading to three-phase power imbalance there is no local shades；Realize independent MPPT
Control, generating efficiency are improved；DC voltage is reduced, the stability and safety of system are enhanced；System expandable
Property and redundant ability improve；The fluctuation of low-voltage direct bus junction independent capacitance secondary power is eliminate or reduced, thus significantly
Reduce the volume of low-voltage direct bus junction separate capacitors.
Preferably, further include three check configurations and multiple DC bus junction capacitors, the phase structure by every
Release modularization cascaded converter modules group cascade connection composition, the DC bus junction capacitor is respectively and corresponding to three
The isolated form modularization cascaded converter modules group of phase is connected in parallel, and three-phase structure uses star-like connection, three phase structures
Make star-like connection, neutral point N in high-voltage alternating cathode port.
It preferably, further include power conversion unit, power conversion unit is by isolated form modularization cascaded converter modules group
Composition, isolated form modularization cascaded converter modules group are made of one or more isolated form full bridge units, and multiple isolated forms are complete
Bridge unit is connected with the structure type of input-series and output-parallel, the low-voltage direct port (A, B) of multiple isolated form full bridge units
Parallel connection constitutes the low-voltage direct port of single-phase invertor, and the high-voltage alternating port (C, D) of multiple isolated form full bridge units is connected, the
One filter inductance L of C port series connection of one isolated form modularization cascaded converter modules groupfIt is used as high-voltage alternating positive terminal afterwards
Mouthful, the port the D lead-out wire of module group n is as high-voltage alternating cathode port N；
Isolated form modularization cascaded converter modules group uses phase-shifting carrier wave PWM modulation strategy, multiple isolated form modularizations
The carrier signal of cascade converter differs 180 °/n, and signal wave is just the same.
Preferably, isolated form modularization cascaded converter modules group is made of two isolated form full-bridge modules, and isolated form is complete
Bridge module is made of upper submodule, lower submodule and low-voltage direct lateral capacitance, and upper submodule, lower submodule are by prime active H
Bridge, high frequency transformer and rear class active H bridge composition, prime active H bridging connect the primary side of high frequency transformer, rear class active H bridging
Connect the secondary side of high frequency transformer, the positive and negative electrode port (P1, N1) of the prime active H bridge of upper submodule and the prime of lower submodule
The positive and negative electrode port (P2, N2) of active H bridge is in parallel respectively to be used as low-voltage direct port (A, B), the series connection of rear class active H bridge port
It constitutes high-voltage alternating port (C, D), low-voltage direct lateral capacitance is connected in parallel on low-voltage direct port；Prime active H bridge and rear class active H
There are four the active switch pipes of anti-paralleled diode to form by band for bridge, and the collector of each active switch pipe continues with respective respectively
The cathode of stream diode is connected, and emitter is connected with the anode of respective freewheeling diode respectively.
Preferably, on isolated form full-bridge modules submodule port (C, O) output voltage be with AC and DC component just
Polarity high frequency voltage square wave, the output voltage of lower submodule port (O, D) are the negative polarity high frequency voltage with AC and DC component
Square wave, isolated form full-bridge modules port (C, D) output voltage are the high frequency voltage side with positive-negative polarity of only AC compounent
Wave.
Preferably, the prime active H bridge of submodule includes a first active switch pipe, one on isolated form full-bridge modules
Second active switch pipe, a third active switch pipe and a 4th active switch pipe；First active switch pipe and third master
Dynamic switching tube series connection, the series connection of tetra- active switch pipe of the second active switch Guan Yu, two series connection bridge arms are in parallel, i.e. the first active is opened
The connected positive port as active H bridge of the collector of pipe and the collector of the second active switch pipe is closed, third is actively opened
The cathode port that the emitter of the emitter and the 4th active switch pipe that close pipe is connected as active H bridge；First active switch
The emitter of pipe and the collector of third active switch pipe are connect after being connected with the first high frequency transformer primary side end, and the second active is opened
The collector of the emitter and the 4th active switch pipe that close pipe is connect after being connected with the another terminal of the first high frequency transformer primary side.
Preferably, the rear class active H bridge of submodule includes a 5th active switch pipe, one on isolated form full-bridge modules
6th active switch pipe, a 7th active switch pipe and a 8th active switch pipe；5th active switch Guan Yu seven is main
Dynamic switching tube series connection, the series connection of eight active switch pipe of the 6th active switch Guan Yu, two series connection bridge arms are in parallel, i.e. the 5th active is opened
The positive port that the collector of the collector and the 6th active switch pipe that close pipe is connected as active H bridge, the 7th active switch
The connected cathode port as active H bridge of the emitter of the emitter of pipe and the 8th active switch pipe；5th active switch pipe
Emitter and the 7th active switch pipe collector be connected after connect with the first high frequency transformer pair side end, the 6th active switch
The collector of the emitter of pipe and the 8th active switch pipe is connect after being connected with the another terminal on the first high frequency transformer pair side.
Preferably, the high frequency transformer portion of submodule includes first high frequency transformer on isolated form full-bridge modules,
Terminal (G, H) is two terminals of the first high frequency transformer primary side, and terminal (I, J) is two ends on the first high frequency transformer pair side
Son, terminal (G, I) are Same Name of Ends；The high frequency transformer portion of the lower submodule includes second high frequency transformer, terminal
(K, L) is two terminals of the second high frequency transformer primary side, and terminal (M, N) is two terminals on the second high frequency transformer pair side,
Terminal (K, M) is Same Name of Ends.
Preferably, the prime active H bridge of the lower submodule is opened including a 9th active switch pipe, the tenth active
Guan Guan, a 11st active switch pipe and a 12nd active switch pipe Q12；9th active switch Guan Yu 11 is actively
Switching tube series connection, the series connection of 12 active switch pipe of the tenth active switch Guan Yu, two series connection bridge arms are in parallel, i.e. the 9th active is opened
The positive port that the collector of the collector and the tenth active switch pipe that close pipe is connected as active H bridge, the 11st active are opened
The cathode port that the emitter of the emitter and the 12nd active switch pipe that close pipe is connected as active H bridge；9th active is opened
The collector of the emitter and the 11st active switch pipe that close pipe is connect after being connected with the second high frequency transformer primary side end, and the tenth is main
The other end after the emitter of dynamic switching tube and the collector of the 12nd active switch pipe are connected with the second high frequency transformer primary side
Son connection.
Preferably, the rear class active H bridge of submodule includes the 13rd active switch pipe, one under isolated form full-bridge modules
A 14th active switch pipe, a 15th active switch pipe and a 16th active switch pipe；13rd active switch
The series connection of 15 active switch pipe of Guan Yu, the series connection of 16 active switch pipe of the 14th active switch Guan Yu, two series connection bridge arms
Parallel connection, the i.e. emitter of the emitter of the 13rd active switch pipe and the 14th active switch pipe are connected as active H bridge
Positive port, the collector of the 15th active switch pipe and the collector of the 16th active switch pipe, which are connected, is used as active H bridge
Cathode port；The collector of 13rd active switch pipe and connected rear and the second high frequency of the emitter of the 15th active switch pipe
The connection of transformer secondary end, the emitter of the collector of the 14th active switch pipe and the 16th active switch pipe be connected after with the
The another terminal on two high frequency transformer pair sides connects.
Compared with prior art, the invention has the advantages that
(1) with using voltage converter and install low pressure Industrial Frequency Transformer additional and be pooled to generate desired network voltage
Middle pressure AC network is compared, and presses grid-connected system using modularization cascade connection type power inverter and high-frequency isolation technology in the photovoltaic
Effectively combine, eliminate prime Industrial Frequency Transformer, using high-frequency isolation type transformer, improve prime Industrial Frequency Transformer quality weight and
The problems such as spatial volume is big.
(2) it presses grid-connected system structure to collect technology using more low-voltage direct buses in the photovoltaic, reduce or eliminates
Low-voltage direct bus side capacitors undertake secondary power fluctuation problem, the size and volume of capacitor are effectively reduced, to reduce
The volume of grid-connected system is pressed in whole photovoltaic.
(3) modularized design is used, isolated form modularization cascaded converter modules group maintenance, each module output electricity are convenient for
Pressure and power are more stable.
(4) compared with the traditional stage type power inverter for being applied to photovoltaic parallel in system, pressure is generated electricity by way of merging two or more grid systems in the photovoltaic
System structure high-pressure side no longer needs bulky capacitor, reduces the quantity of capacitor.On the one hand due to isolated form modularization cascaded transformation
Device be single stage type power conversion, high-pressure side pulsewidth modulation be by the combination of actions of submodule front stage active H bridge switch pipe come
It completes, and the pwm voltage wave passes through the coupling of high frequency transformer, can directly be supported by the capacitor of low-voltage direct side,
Therefore no longer capacitor is needed to support in high-pressure side；On the other hand, all two frequencys multiplication of grid-connected system structure are pressed in the photovoltaic
Power swing is transferred to common low pressure DC bus and cancels out each other, therefore common low pressure DC bus does not need largely yet
Capacitor supports, and compares traditional two-stage type isolated form modularization cascade converter, can reduce a large amount of electric capacity of voltage regulation, has efficiency
The features such as high, small in size, at low cost, power density is big.
(5) grid-connected system structure is pressed not need two-way switch pipe in the photovoltaic.Since isolated form full-bridge modules are upper and lower
The polarity of the high-pressure side port voltage of submodule is constant always, therefore does not need two-way switch pipe, avoids the change of traditional single stage formula
Parallel operation secondary side Commutation Problem and due to voltage spikes problem.
(6) grid-connected system structure is pressed not need Pressure and Control in the photovoltaic.Due to the high side voltage of each module
It is all directly vised by common low pressure DC bus-bar voltage by high frequency transformer, therefore the stable state and dynamic of each module output voltage
Characteristic is consistent, does not need additionally to increase Pressure and Control, reduces the complexity of control.
Detailed description of the invention
Fig. 1 is that traditional stage type isolated form modularization applied to photovoltaic parallel in system cascades transformer configuration signal
Figure；
Fig. 2 is that the more low-voltage direct buses of high-frequency isolation type of the invention collect pressure grid-connected system structural representation in photovoltaic
Figure；
Fig. 3 is single-phase isolated form modularization cascaded converter modules group structural schematic diagram of the invention；
Fig. 4 is isolated form full-bridge modules topological structure schematic diagram of the invention；
Fig. 5 is the output waveform figure of isolated form full-bridge modules of the invention；
In figure:
1: isolated form modularization cascaded converter modules group (inverter unit)；
2: isolated form full-bridge modules (I-BC)；
3: submodule on isolated form full-bridge modules
The upper submodule block prefix H bridge of 31:I-BC；
The upper submodule rear class H bridge of 32:I-BC；
4: submodule under isolated form full-bridge modules
Submodule block prefix H bridge under 41:I-BC；
Submodule rear class H bridge under 42:I-BC；
PV Arrays 1-N: centralized photovoltaic array；
DC bus: low-voltage direct bus；
Phase A, B, C converter: three-phase inverter；
Two stage sub-module: twin-stage inverter submodule；
DAB: double active full-bridge converters；
H Bridge:H bridging parallel operation；
Individual DC capacitor: DC side separate capacitors；
ia、ib、ic: three-phase phase current；
Medium Voltage AC Grid: AC network is pressed in three-phase；
Inverter unit A1-An、B1-Bn、C1- Cn: isolated form modularization cascaded converter modules group；
I-MCC: isolated form modularization cascade converter；
I-BC: isolated form full-bridge modules；
N: neutral point；
Vac: isolated form modularization cascades the exchange of inverter module group and surveys voltage；
T1, T2: high frequency transformer；
A, B:I-BC low-pressure side positive and negative electrode port；
The upper submodule block prefix H bridge positive and negative electrode port P1, N1:I-BC；
Submodule block prefix H bridge positive and negative electrode port under P2, N2:I-BC；
C, submodule rear class H bridge positive and negative electrode port on O:I-BC；
O, submodule rear class H bridge positive and negative electrode port under D:I-BC；
Q1~Q4: upper submodule block prefix H bridge switch pipe, such as insulated gate bipolar transistor (IGBT)；
Q5~Q8: upper submodule rear class H bridge switch pipe, such as insulated gate bipolar transistor (IGBT)；
Q9~Q12: lower submodule block prefix H bridge switch pipe, such as insulated gate bipolar transistor (IGBT)；
Q13~Q16: lower submodule rear class H bridge switch pipe, such as insulated gate bipolar transistor (IGBT)；
Vco: the upper submodule output voltage of I-BC；
Vod: submodule output voltage under I-BC；
Vcd: I-BC module output voltage.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings.Below with reference to
The embodiment of attached drawing description is exemplary, it is intended to is used to explain the present invention, and is not considered as limiting the invention.
The more low-voltage direct buses of high-frequency isolation type collect pressure grid-connected system structure in photovoltaic, it is characterised in that: described
Grid-connected photovoltaic system structure, centralized photovoltaic cell component are divided into multiple arrays, each photovoltaic array (PV array)
With correspond to three-phase isolated form modularization cascaded converter modules group (inverter cellAn, inverter cellBn,
Inverter cellAn) it is connected in parallel.The advantages of structure is: there is no local shades to lead to three-phase power imbalance
Problem；Realize independent MPPT control, generating efficiency is improved；Reduce DC voltage, enhance system stability and
Safety；The system expandability and redundant ability improve；It is secondary to eliminate or reduce low-voltage direct bus junction independent capacitance
Power swing, to greatly reduce the volume of low-voltage direct bus junction separate capacitors.
Capacitor uses excellent capacitor, such as thin film capacitor, to mitigate direct current ring at its low-voltage direct collection bus
Voltage ripple in section reduces secondary power fluctuation.Using the control strategy based on grid voltage orientation, improves low-voltage direct and converge
Collect capacitor stability at bus, reduces capacitor capacitance.
Grid-connected system structure is pressed in photovoltaic, power conversion unit is by isolated form modularization cascaded converter modules group
(inverter cell) is cascaded.Cascade connection type photovoltaic parallel in system structure and modularization inverter topology combine, and are playing
Cascaded inverter has the frequency conversion ability of high-voltage large-capacity, is easy to modularization extension, does not need transformer and can be directly accessed
While the advantages that high-voltage fence, but with more level power converter techniques can alleviate switching device performance and mesohigh it is big
The characteristics of contradiction between power reduces dv/dt, reduces the harmonic content of output voltage, modularization cascade connection type is grid-connected inverse
Become device and meets requirement of the large-scale photovoltaic grid-connected system to inverter capacity, efficiency and reliability.This structure uses just
It is pressure grid-connected system structure in modularization cascade connection type photovoltaic.
Grid-connected system structure is pressed in photovoltaic, three-phase structure includes that three phase structures and multiple DC bus collect
Locate capacitor CdcL.Phase structure is made of isolated form modularization cascaded converter modules group cascade connection.DC bus junction
Capacitor CdcLRespectively with correspond to three-phase isolated form modularization cascaded converter modules group (inverter cellAn、
inverter cellBn、inverter cellCn) be connected in parallel.Three-phase structure uses star-like connection, the height of three phase structures
Make star-like connection, neutral point N in pressure exchange cathode port.
Power conversion unit forms (inverter cell) by isolated form modularization cascaded converter modules group.Isolated form
Modularization cascaded converter modules group is made of (I-BC) one or more isolated form full bridge units, multiple isolated form full bridge units
It is connected with the structure type of input-series and output-parallel (IPOS), the low-voltage direct port (A, B) of multiple isolated form full bridge units
Parallel connection constitutes the low-voltage direct port of single-phase invertor, and the high-voltage alternating port (C, D) of multiple isolated form full bridge units is connected, the
One filter inductance L of C port series connection of one isolated form modularization cascaded converter modules groupfIt is used as high-voltage alternating positive terminal afterwards
Mouthful, the port the D lead-out wire of module group n is as high-voltage alternating cathode port N.
Isolated form modularization cascaded converter modules group uses phase-shifting carrier wave PWM modulation strategy.Each isolated form modularization
Cascaded converter modules group includes multiple isolated form full bridge units, the carrier signal phase of multiple isolated form modularization cascade converters
Poor 180 °/n, signal wave is just the same, eliminates the distortion of zero current cross in modularization cascade system, reduces filter ruler
It is very little.
Isolated form modularization cascaded converter modules group is made of two isolated form full-bridge modules (I-BC).Isolated form full-bridge
Module is by upper submodule, lower submodule and low-voltage direct lateral capacitance CdcLIt constitutes, upper submodule, lower submodule are by prime active H
Bridge, high frequency transformer and rear class active H bridge composition, prime active H bridging connect the primary side of high frequency transformer, rear class active H bridging
Connect the secondary side of high frequency transformer, the positive and negative electrode port (P1, N1) of the prime active H bridge of upper submodule and the prime of lower submodule
The positive and negative electrode port (P2, N2) of active H bridge is in parallel respectively to be used as low-voltage direct port (A, B), the series connection of rear class active H bridge port
It constitutes high-voltage alternating port (C, D), low-voltage direct lateral capacitance CdcLIt is connected in parallel on low-voltage direct port；Prime active H bridge and rear class master
Dynamic H bridge is made of the active switch pipe with 4 anti-paralleled diodes, the collector of each active switch pipe respectively with it is respective
The cathode of freewheeling diode is connected, and emitter is connected with the anode of respective freewheeling diode respectively.
The upper submodule modulation ratio of isolated form full-bridge modules is alternating current-direct current hybrid modulation ratio, and lower submodule modulation ratio is to hand over directly
Flow hybrid modulation ratio, wherein D is direct current common modulation ratio, and d is AC modulation ratio, and the AC modulation between different phases compares phase
Poor 120 °.
The output voltage of submodule port (C, O) is that the positive polarity with AC and DC component is high on isolated form full-bridge modules
Frequency voltage square wave, the output voltage of lower submodule port (O, D) are the negative polarity high frequency voltage square wave with AC and DC component,
Isolated form full-bridge modules port (C, D) output voltage is the high frequency voltage square wave with positive-negative polarity of only AC compounent.
The prime active H bridge of submodule includes a first active switch pipe Q1, one second on isolated form full-bridge modules
Active switch pipe Q2, a third active switch pipe Q3 and a 4th active switch pipe Q4；First active switch pipe Q1 and
Three active switch pipe Q3 series connection, the second active switch pipe Q2 connect with the 4th active switch pipe Q4, and two series connection bridge arms are in parallel, i.e.,
The connected positive terminal as active H bridge of the collector of the collector of first active switch pipe Q1 and the second active switch pipe Q2
The emitter of mouth P1, third active switch pipe Q3 and the emitter of the 4th active switch pipe Q4 are connected as the negative of active H bridge
Extreme mouth N1；The emitter of first active switch pipe Q1 and the collector of third active switch pipe Q3 become after being connected with the first high frequency
The collector of depressor T1 primary side end G connection, the emitter of the second active switch pipe Q2 and the 4th active switch pipe Q4 be connected after with
The another terminal H connection of first high frequency transformer T1 primary side.
The rear class active H bridge of submodule includes a 5th active switch pipe Q5, one the 6th on isolated form full-bridge modules
Active switch pipe Q6, a 7th active switch pipe Q7 and a 8th active switch pipe Q8；5th active switch pipe Q5 and
Seven active switch pipe Q7 series connection, the 6th active switch pipe Q6 connect with the 8th active switch pipe Q8, and two series connection bridge arms are in parallel, i.e.,
The positive port that the collector of 5th active switch pipe Q5 and the collector of the 6th active switch pipe Q6 are connected as active H bridge
The negative pole end that the emitter of C, the 7th active switch pipe Q7 and the emitter of the 8th active switch pipe Q8 are connected as active H bridge
Mouth O；The emitter of 5th active switch pipe Q5 and connected rear and the first high frequency transformer of the collector of the 7th active switch pipe Q7
The collector of T1 pair side end I connection, the emitter of the 6th active switch pipe Q6 and the 8th active switch pipe Q8 be connected after with first
The another terminal J connection on high frequency transformer T1 pair side.
The high frequency transformer portion of submodule includes a first high frequency transformer T1, terminal on isolated form full-bridge modules
(G, H) is two terminals of the first high frequency transformer T1 primary side, and terminal (I, J) is two ends on the first high frequency transformer T1 pair side
Son, terminal (G, I) are Same Name of Ends；The high frequency transformer portion of the lower submodule includes a second high frequency transformer T2, end
Sub (K, L) is two terminals of the second high frequency transformer T2 primary side, and terminal (M, N) is two of the second high frequency transformer T2 pair side
Terminal, terminal (K, M) are Same Name of Ends.
Preferably, the prime active H bridge of the lower submodule includes a 9th active switch pipe to isolated form full-bridge modules
Q9, the tenth active switch pipe Q10, a 11st active switch pipe Q11 and a 12nd active switch pipe Q12；The
Nine active switch pipe Q9 connect with the 11st active switch pipe Q11, the tenth active switch pipe Q10 and the 12nd active switch pipe
Q12 series connection, two series connection bridge arms are in parallel, i.e. the current collection of the collector of the 9th active switch pipe Q9 and the tenth active switch pipe Q10
The positive port P2 being extremely connected as active H bridge, the emitter and the 12nd active switch pipe of the 11st active switch pipe Q11
The connected cathode port N2 as active H bridge of the emitter of Q12；The emitter of 9th active switch pipe Q9 and the 11st is actively
The collector of switching tube Q11 is connect after being connected with the second high frequency transformer T2 primary side end K, the transmitting of the tenth active switch pipe Q10
The collector of pole and the 12nd active switch pipe Q12 are connect after being connected with the another terminal L of the second high frequency transformer T2 primary side.
The rear class active H bridge of submodule includes a 13rd active switch pipe Q13, one the under isolated form full-bridge modules
14 active switch pipe Q14, a 15th active switch pipe Q15 and a 16th active switch pipe Q16；13rd actively
Switching tube Q13 connects with the 15th active switch pipe Q15, and the 14th active switch pipe Q14 and the 16th active switch pipe Q16 go here and there
Connection, two series connection bridge arms are in parallel, i.e. the transmitting of the emitter and the 14th active switch pipe Q14 of the 13rd active switch pipe Q13
The positive port O being extremely connected as active H bridge, the collector and the 16th active switch pipe of the 15th active switch pipe Q15
The connected cathode port D as active H bridge of the collector of Q16；The collector of 13rd active switch pipe Q13 and the 15th master
The emitter of dynamic switching tube Q15 is connect after being connected with the second high frequency transformer T2 pair side end M, the 14th active switch pipe Q14's
Connect after the emitter of collector and the 16th active switch pipe Q16 are connected with the another terminal N on the second high frequency transformer T2 pair side
It connects.
Fig. 2, which is collected for the present invention with the more low-voltage direct buses of high-frequency isolation type of embodiment, presses grid-connected system in photovoltaic
Structure chart, including centralized photovoltaic array (PV arrays), isolated form modularization cascaded converter modules group (inverter
) and low-voltage direct bus junction capacitor C unitdcL.The centralization photovoltaic array (PV arrays) is divided into multiple arrays
(PV arrays1-n), each photovoltaic array carry out reasonable series and parallel to photovoltaic cell component, and export one it is relatively high
DC voltage is then connected to the grid by isolated form modularization cascade converter.Isolated form modularization cascaded converter modules
Group (inverter unit) is formed by going here and there before multiple isolated form full-bridge modules (I-BC) and afterwards, and as low-voltage direct and middle pressure
The port of exchange carries out power conversion.By connection type that is preceding and going here and there afterwards, isolated form modularization cascaded converter modules group is defeated
Outlet can get larger voltage class alternating current.Multiple isolated forms inside each isolated form modularization cascaded converter modules group
Full-bridge modules use phase-shifting carrier wave PWM method, effectively reduce output inductor device volume and weight.Each photovoltaic array
Collect technology by low-voltage direct bus with three isolated form modularization cascaded converter modules groups for corresponding to three-phase to carry out simultaneously
Connection connection, DC bus junction parallel connection direct separate capacitors CdcL.The isolated form modularization cascaded converter modules group of every phase
Output end is connected in series, and reaches the voltage class of middle pressure AC network.Every phase inverter unit series connection uses star-like connection, neutral
Point is N.Output filter uses L-type filter.
Fig. 3 is the topology diagram of isolated form modularization cascaded converter modules group of the invention, complete by multiple isolated forms
It goes here and there before bridge module (I-BC) and afterwards and is formed by connecting.Multiple isolated form full-bridge modules topological structures are identical.Isolated form full-bridge mould
Block I-BC1-nLow-voltage direct positive and negative electrode port access low-voltage direct bus (DC bus).I-BC1-nMiddle pressure AC port string
Connection.Multiple middle pressure AC port outputs have the high frequency voltage square wave of AC compounent.Due to using phase-shifting carrier wave PWM modulation, I-
BC1-nThe high frequency voltage square wave of output is superimposed, generates the high frequency voltage square wave with single I-BC output square wave n overtones band, greatly
Amount reduces the size of filter L.
Fig. 4 is the isolated form full bridge unit topological structure for constituting isolated form modularization cascaded converter modules group shown in Fig. 3
Figure, including upper submodule 3, lower submodule 4 and low-pressure side DC capacitor CdcL.The upper submodule 3 include high frequency transformer T1,
Prime active H bridge 31, rear class active H bridge 32；The lower submodule 4 includes high frequency transformer T2, prime active H bridge 41, rear class
Active H bridge 42.Upper submodule block prefix H bridge terminals P 1 and lower submodule block prefix H bridge terminals P 2 connect and compose low-voltage direct positive terminal
Son；Lower submodule block prefix H bridge terminal N1 and lower submodule block prefix H bridge terminal N2 connect and compose low-voltage direct negative terminal, obtain
To low-voltage direct positive and negative port A, B.In upper submodule 3, primary side end G, H of high frequency transformer T1 connects prime H bridge 31, secondary
Side end I, J connects rear class H bridge 32.In lower submodule 4, primary side end K, L of high frequency transformer T2 connects prime H bridge 41, secondary side
M, N is held to connect rear class H bridge 42.Rear class H bridge positive and negative electrode port C, O and the rear class H bridge of lower submodule 4 of upper submodule 3 are positive and negative
High-voltage alternating positive and negative electrode port C, D of extreme mouth O, D module in series.Low-pressure side DC capacitor CdcLWith low-voltage direct end
Mouth A, B are in parallel.
The isolated form full bridge unit, if ignoring voltage, following equations (1) show each submodule Vdcl, vco or
Relational expression between vod.
The modulation ratio of the upper and lower submodule of the isolated form full-bridge modules is alternating current-direct current hybrid modulation ratio du and dl, wherein
Du is upper submodule modulation ratio, and dl is lower submodule modulation ratio.Du be added with dl by HVDC Modulation ratio D and AC modulation ratio d and
At, and AC modulation ratio d differs 120 ° between different phases.When D is equal to 0.5, dm needs 0≤dm≤0.5 to meet formula (2).
The port voltage Vcd of the isolated form full-bridge modules is the port voltage Vco's and lower submodule Vod of upper submodule
With, by formula (1) and formula (2) merging can obtain formula (3).
Fig. 5 is that port output voltage waveform, full-bridge modules work are surveyed in isolated form full-bridge modules shown in Fig. 4 exchange
When, low-pressure direct flow point is inputted from low-voltage direct port, and by the switch combination of prime H bridge, low-voltage DC is converted to high frequency
Voltage square wave is coupled to rear class H bridge by high frequency transformer, after the switch change-over by rear class H bridge, the rear class of upper submodule
H bridge port C output has the positive polarity high frequency voltage square wave of direct current and AC compounent, the rear class H bridge port output of lower submodule
Negative polarity high frequency voltage square wave with direct current and AC compounent, the rear class H of the rear class H bridge port of upper submodule and lower submodule
Bridge port is series relationship, and output only has the high frequency voltage square wave with positive-negative polarity of AC compounent, after filtering just
Perfect sine wave can be exported.Assuming that high-voltage alternating port C, D output voltage is when high frequency transformer winding no-load voltage ratio is k:1
Above is only a specific embodiment of the present invention, but technical characteristic of the invention is not limited thereto, Ren Heben
Within the field of the present invention, made changes or modifications all cover within the scope of the patent of the present invention the technical staff in field.
Claims (10)
1. the more low-voltage direct buses of high-frequency isolation type, which collect, presses grid-connected system in photovoltaic, it is characterised in that: including multiple battle arrays
The centralized photovoltaic cell component of column, the array of each centralization photovoltaic cell component and the isolated form modularization for corresponding to three-phase
Cascaded converter modules group is connected in parallel.
2. the more low-voltage direct buses of high-frequency isolation type as described in claim 1, which collect, presses grid-connected system in photovoltaic, special
Sign is: further including three check configurations and multiple DC bus junction capacitors, the phase structure is by isolated form module
Change cascaded converter modules group cascade connection composition, the DC bus junction capacitor respectively with correspond to three-phase and being isolated
Type modularization cascaded converter modules group is connected in parallel, and three-phase structure uses star-like connection, the high-voltage alternating of three phase structures
Make star-like connection, neutral point N in cathode port.
3. the more low-voltage direct buses of high-frequency isolation type as described in claim 1, which collect, presses grid-connected system in photovoltaic, special
Sign is: further including power conversion unit, power conversion unit is made of isolated form modularization cascaded converter modules group, isolation
Type modularization cascaded converter modules group is made of (I-BC) one or more isolated form full bridge units, multiple isolated form full-bridge lists
Member is connected with the structure type of input-series and output-parallel (IPOS), the low-voltage direct ports of multiple isolated form full bridge units (A,
B) the low-voltage direct port in parallel for constituting single-phase invertor, high-voltage alternating port (the C, D) series connection of multiple isolated form full bridge units,
One filter inductance L of C port series connection of first isolated form modularization cascaded converter modules groupfAfterwards as high-voltage alternating anode
Port, the port the D lead-out wire of module group n is as high-voltage alternating cathode port N；Isolated form modularization cascaded converter modules group is adopted
180 °/n is differed with the carrier signal of phase-shifting carrier wave PWM modulation strategy, multiple isolated form modularization cascade converters, signal wave is complete
It is complete the same.
4. the more low-voltage direct buses of high-frequency isolation type as claimed in claim 3, which collect, presses grid-connected system in photovoltaic, special
Sign is: isolated form modularization cascaded converter modules group is made of two isolated form full-bridge modules (I-BC), isolated form full-bridge
Module is made of upper submodule, lower submodule and low-voltage direct lateral capacitance, upper submodule, lower submodule by prime active H bridge,
High frequency transformer and rear class active H bridge composition, prime active H bridging connect the primary side of high frequency transformer, and rear class active H bridging connects height
The secondary side of frequency power transformer, the positive and negative electrode port (P1, N1) of the prime active H bridge of upper submodule and the prime active H of lower submodule
The positive and negative electrode port (P2, N2) of bridge is in parallel respectively to be used as low-voltage direct port (A, B), rear class active H bridge port height in series
It presses AC port (C, D), low-voltage direct lateral capacitance is connected in parallel on low-voltage direct port；Prime active H bridge and rear class active H bridge by
Band there are four anti-paralleled diode active switch pipe form, the collector of each active switch pipe respectively with respective two pole of afterflow
The cathode of pipe is connected, and emitter is connected with the anode of respective freewheeling diode respectively.
5. the more low-voltage direct buses of high-frequency isolation type as claimed in claim 4, which collect, presses grid-connected system in photovoltaic, special
Sign is: the output voltage of submodule port (C, O) is the positive polarity high frequency with AC and DC component on isolated form full-bridge modules
Voltage square wave, the output voltage of lower submodule port (O, D) they are the negative polarity high frequency voltage square wave with AC and DC component, every
Release full-bridge modules port (C, D) output voltage is the high frequency voltage square wave with positive-negative polarity of only AC compounent.
6. the more low-voltage direct buses of high-frequency isolation type as claimed in claim 4, which collect, presses grid-connected system in photovoltaic, special
Sign is: the prime active H bridge of submodule includes a first active switch pipe, second active on isolated form full-bridge modules
Switching tube, a third active switch pipe and a 4th active switch pipe；First active switch pipe and third active switch pipe
Series connection, the series connection of tetra- active switch pipe of the second active switch Guan Yu, two series connection bridge arms are in parallel, i.e. the collection of the first active switch pipe
The connected positive port as active H bridge of the collector of electrode and the second active switch pipe, the hair of third active switch pipe
The connected cathode port as active H bridge of the emitter of emitter-base bandgap grading and the 4th active switch pipe；The transmitting of first active switch pipe
The collector of pole and third active switch pipe is connect after being connected with the first high frequency transformer primary side end, the hair of the second active switch pipe
The collector of emitter-base bandgap grading and the 4th active switch pipe is connect after being connected with the another terminal of the first high frequency transformer primary side.
7. the more low-voltage direct buses of high-frequency isolation type as claimed in claim 4, which collect, presses grid-connected system in photovoltaic, special
Sign is: the rear class active H bridge of submodule includes a 5th active switch pipe, the 6th active on isolated form full-bridge modules
Switching tube, a 7th active switch pipe and a 8th active switch pipe；5th active switch Guan Yu, seven active switch pipe
Series connection, the series connection of eight active switch pipe of the 6th active switch Guan Yu, two series connection bridge arms are in parallel, i.e. the collection of the 5th active switch pipe
The connected positive port as active H bridge of the collector of electrode and the 6th active switch pipe, the transmitting of the 7th active switch pipe
The cathode port that pole is connected with the emitter of the 8th active switch pipe as active H bridge；The emitter of 5th active switch pipe
It is connect after being connected with the collector of the 7th active switch pipe with the first high frequency transformer pair side end, the transmitting of the 6th active switch pipe
The collector of pole and the 8th active switch pipe is connect after being connected with the another terminal on the first high frequency transformer pair side.
8. the more low-voltage direct buses of high-frequency isolation type as claimed in claim 4, which collect, presses grid-connected system in photovoltaic, special
Sign is: the high frequency transformer portion of submodule includes first high frequency transformer, terminal (G, H) on isolated form full-bridge modules
For two terminals of the first high frequency transformer primary side, terminal (I, J) is two terminals on the first high frequency transformer pair side, terminal
(G, I) is Same Name of Ends；The high frequency transformer portion of the lower submodule includes second high frequency transformer, and terminal (K, L) is
Two terminals of the second high frequency transformer primary side, terminal (M, N) be the second high frequency transformer pair side two terminals, terminal (K,
It M) is Same Name of Ends.
9. the more low-voltage direct buses of high-frequency isolation type as claimed in claim 4, which collect, presses grid-connected system in photovoltaic, special
Sign is: the prime active H bridge of the lower submodule includes a 9th active switch pipe, a tenth active switch pipe, one
A 11st active switch pipe and a 12nd active switch pipe Q12；9th active switch Guan Yu, 11 active switch pipe
Series connection, the series connection of 12 active switch pipe of the tenth active switch Guan Yu, two series connection bridge arms are in parallel, i.e. the 9th active switch pipe
The connected positive port as active H bridge of the collector of collector and the tenth active switch pipe, the 11st active switch pipe
The connected cathode port as active H bridge of the emitter of emitter and the 12nd active switch pipe；9th active switch pipe
The collector of emitter and the 11st active switch pipe is connect after being connected with the second high frequency transformer primary side end, the tenth active switch
The collector of the emitter of pipe and the 12nd active switch pipe is connect after being connected with the another terminal of the second high frequency transformer primary side.
10. the more low-voltage direct buses of high-frequency isolation type as claimed in claim 4, which collect, presses grid-connected system in photovoltaic, special
Sign is: the rear class active H bridge of submodule includes a 13rd active switch pipe, one the 14th under isolated form full-bridge modules
Active switch pipe, a 15th active switch pipe and a 16th active switch pipe；13rd active switch Guan Yu ten
The series connection of five active switch pipes, the series connection of 16 active switch pipe of the 14th active switch Guan Yu, two series connection bridge arms parallel connections, i.e., the
The positive port that the emitter of 13 active switch pipes and the emitter of the 14th active switch pipe are connected as active H bridge,
The negative pole end that the collector of 15th active switch pipe and the collector of the 16th active switch pipe are connected as active H bridge
Mouthful；The collector of 13rd active switch pipe and connected rear and the second high frequency transformer pair of the emitter of the 15th active switch pipe
Side end connection, the collector of the 14th active switch pipe and the emitter of the 16th active switch pipe become after being connected with the second high frequency
The another terminal on depressor pair side connects.
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| CN112751349A (en) * | 2019-10-29 | 2021-05-04 | 财团法人工业技术研究院 | Extensible three-phase alternating current system based on battery recombination and control method thereof |
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| WO2023050215A1 (en) * | 2021-09-29 | 2023-04-06 | 西门子（中国）有限公司 | Hydrogen production system |
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Application publication date: 20190426 |