CN107634541A - Photovoltaic based on IPOS DC boostings collects access system control method for coordinating - Google Patents
Photovoltaic based on IPOS DC boostings collects access system control method for coordinating Download PDFInfo
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- CN107634541A CN107634541A CN201710976550.0A CN201710976550A CN107634541A CN 107634541 A CN107634541 A CN 107634541A CN 201710976550 A CN201710976550 A CN 201710976550A CN 107634541 A CN107634541 A CN 107634541A
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
-
- 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Electrical Variables (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The present invention relates to a kind of photovoltaic based on IPOS DC boostings to collect access system control method for coordinating, for the photovoltaic parallel in system including DC boosting module and modular multilevel MMC；Wherein, DC boosting module isolates the structure of DC/DC submodule input-series and output-parallels using full-bridge, when receiving end power network needs photovoltaic plant Maximum Power Output, system is operated in maximum power control pattern, when receiving end power network can not consume the power that photovoltaic plant is sent completely, system is operated in power limited pattern.
Description
Technical field
The present invention relates to photovoltaic power generation grid-connecting field, more particularly to including input-series and output-parallel (IPOS) structure
The photovoltaic system of DC boosting module carries out coordination control.
Background technology
As one kind cleaning, efficient, regenerative resource, photovoltaic generation is used widely.Due to photovoltaic plant typically away from
From load center farther out, the ability to send outside of collecting of large-scale electric energy turns into the key issue for influenceing photovoltaic exploitation.But tradition is handed over
Flow that the fed distance of transmission of electricity is short, and ability to transmit electricity is weak, it is very big that exchange collects the capacitive reactance of system, induction reactance, exchanges the harmonic wave of access system
Resonance, idle transmission problem are very prominent.Flexible direct current power transmission system is not transmitted electricity reactance, it is possible to achieve active and idle independence
Control, control form is various, and the degree of modularity is high.So flexible direct current power transmission system can be used to multiple photovoltaic plant current collections
Send out, effectively solve to exchange the restriction collected to large-scale photovoltaic power station.
Photovoltaic DC boosting collect access system be DC boosting between photovoltaic generation unit and grid connection point, collect and
The general name of access grid-connected system.It mainly uses for reference DC transmission system correlation technique, the low-voltage DC that photovoltaic array is exported
Middle high-pressure DC voltage is raised to using DC boosting module, recycles modular multilevel (MMC) to collect access receiving end power network.
In order to solve the problems, such as direct current transportation mesohigh, using multimode input-series and output-parallel (IPOS) combined type topological structure.
The pressure of modules in system is must assure that on the premise of realizing photovoltaic maximum power tracing, is flowed.MMC, which has, determines dc bus
Voltage and determine two kinds of control modes of active power.Collect system for photovoltaic DC boosting, through DC/DC-MMC transmitted electricity
DC bus-bar voltage must be controlled in journey.When photovoltaic system operates in maximum power tracing pattern, MMC is using fixed straight
Flow busbar voltage control.When receiving-end system produces power swing, MMC, which needs to be switched to, determines active power mode.Now, direct current is female
Line voltage produces fluctuation.DC/DC converters and MMC devices have isolated photovoltaic and receiving-end system, and photovoltaic plant can not be made in time
Reaction, photovoltaic are still operated in maximum power state.System produces unbalanced power phenomenon, has a strong impact on that power system stability is transported
OK.
Therefore, in order to solve the above problems, the present invention collects access system structure for photovoltaic DC boosting, it is proposed that can
To realize that DC Module is pressed, flowed, realize system coordination operation without Control on Communication strategy so that photovoltaic system is safe and reliable
Operation.
The content of the invention
Collect the IPOS structures of access system for photovoltaic DC boosting, the present invention, which provides one kind, can realize DC Module
Press, flow, realize system coordination operation without Control on Communication strategy so that photovoltaic system safe and reliable operation.
A kind of photovoltaic based on IPOS DC boostings collects access system control method for coordinating, for including DC boosting mould
The photovoltaic parallel in system of block and modular multilevel MMC；Wherein, DC boosting module is defeated using full-bridge isolation DC/DC submodules
Enter the structure of series and output-parallel, system is operated in peak power control when receiving end power network needs photovoltaic plant Maximum Power Output
Molding formula, when receiving end power network can not consume the power that photovoltaic plant is sent completely, system is operated in power limited pattern, corresponding
Control strategy be respectively：
A. maximum power tracing control model
(1) maximum photovoltaic power point magnitude of voltage is calculated as the finger of DC boosting module input voltage by the use of conductance increment method
Make value；
(2) DC boosting module is by the way of single current inner loop regulation inside outer voltage and submodule, collection
The input voltage of DC boosting module simultaneously makes the difference itself and maximum power point voltage command value, is formed through pi regulator outside voltage
Ring, there is provided the command value of input current；Gather the input current of different submodules and respectively compared with input current command value, warp
Pi regulator forms independent current inner loop, each input current is followed corresponding command value；
(3) introduce submodule output voltage and press compensation policy, gather the output voltage and submodule of each submodule
Average output voltage makes the difference, and forms feedback signal through proportional controller, acts on current inner loop, adjust the output voltage of submodule
Value；
(4) MMC coordinates Reactive Power Control mode, stable DC busbar voltage using DC bus-bar voltage is determined；
B. receiving end grid power definition mode
(1) MMC is switched to the control model for determining active power and reactive power；
(2) DC boosting module controller collection DC bus-bar voltage, makes the difference, difference exceeds certain limit with command value
When, disabling signal is sent to maximum power control device, the outer voltage controller of maximum power tracing is disabled；
(3) DC bus-bar voltage instantaneous value is gathered compared with command value, and forming DC bus-bar voltage through proportional controller closes
Ring, there is provided the command value of submodule current controller；
(4) current inner loop controller inside submodule and pressure compensation control do not change, with maximum power tracing pattern
It is identical.
Control strategy proposed by the invention is directed to the photovoltaic system with DC boosting module, and control strategy stably may be used
Lean on, the stability of system can be improved.DC boosting series connection submodule can realize output voltage equalization function, photovoltaic system reality
Existing stable coordination operation.Therefore, control strategy proposed by the invention is highly suitable to be applied in photovoltaic DC booster system.
Brief description of the drawings
Fig. 1 DC boosting module topology schematic diagrams
Fig. 2 system coordination control figures
Fig. 3 BFBIC small-signal models
Fig. 4 DC boostings module controls
Fig. 5 maximum power point tracking oscillograms
Fig. 6 BFBIC module input current waveform figures
Fig. 7 DC boosting module output voltage waveforms
Fig. 8 system output power waveforms
Embodiment
(1) topological structure
The system of the present invention benefits access system for photovoltaic DC boosting, and DC boosting module is by photovoltaic array output voltage
Voltage levels needed for flexible DC power transmission are transformed to, all photovoltaic generations collect in high-pressure side, become by modular multilevel
Parallel operation inversion boosting is that 35kV accesses power network.In order to realize the adaptation to direct-current transmission voltage grade, DC boosting module uses
It is multiple change flow module input-series and output-parallels (IPOS) realize output voltage lifted, as shown in Fig. 2 each become flow module into
Boost full-bridges isolation (BFBIC) topology.LboostFor boost inductance, switching tube S1~S4Collectively constitute full-bridge circuit, LrFor transformation
The equivalent leakage inductance of device, commutation diode D1~D4Form high frequency full bridge rectifier, CoFor output filter capacitor, ScAnd CcForm active
Clamp circuit realizes S1~S4ZVT.For decentralized and concentrated DC boosting module, tied using IPOS connections
Structure, simply structural parameters are different, therefore the unified consideration when designing control system.
(2) main models
In order to design controller parameter, analysis system stability, the small-signal models of single BFBIC modules, such as Fig. 3 are established
It is shown.Topological sum R, L, C of Fig. 2 circuits are constant, and switch element is replaced with controlled source, KCL, and KVL and each element Voltammetric Relation are all
With its mean value formation, the electric current of each branch road, voltage quantities are also its average value.V, I, D of capitalization represent the electricity of stable state respectively
Pressure, electric current, dutycycle；V, i, d of small letter represent the voltage, electric current, dutycycle of transient state respectively；There is the expression of " ∧ " small on letter
Signal disturbance.Obtain temporal low frequency small-signal circuit model.
In formula, De=(1-D)/nT
(3) control strategy
In the photovoltaic system control (Fig. 3 solid lines flow graph) on basis, DC control module is realized using MPPT and two close cycles
The MPPT maximum power point tracking of photovoltaic system and boost function, MMC coordinate Reactive Power Control realization to collect using DC voltage is determined
It is grid-connected.In order to lift DC voltage stability, realize that system controls without communication-cooperation, introduced in DC control module extra
Output voltage closed loop, proportion adjustment control is formed, as shown in Fig. 3 dotted line flow graphs.Caused using dead band module in normal operation feelings
Proportion adjustment fails under condition.When AC system needs to limit the power of access power network, MMC, which is switched to, determines PQ control models, directly
Stream busbar voltage can produce fluctuation.When fluctuation exceedes dead band section, DC/DC original base controlling stream graph (solid line flow graph) quilt
Disabling, turn to control DC bus-bar voltage by DC/DC, photovoltaic provides power and automatically declined, and deviates maximum power point.In whole process
In, MMC modules and network load end need not limit power signal to the transmission of DC boosting module, and DC boosting module passes through monitoring
Method of operation judgement, the function of control mode switching can be achieved in DC bus-bar voltage.
DC boosting module is by BFBIC input-series and output-parallels, to ensure the safety and stability of system, it is necessary to consider
BFBIC input current flows, output voltage voltage-sharing, DC Module control figure such as Fig. 4.The present invention is in traditional two close cycles control
Improved on system strategy, by the way of the unified single current inner loop regulation of outer voltage and module so that Ge Gemo
Block input current follows same command value realization to flow.Meanwhile introduce output voltage and press compensation policy, by gathering BFBIC
Output voltage makes the difference with module average voltage, forms feedback signal, acts on current inner loop, adjusts output voltage values.
Based on topological structure shown in Fig. 1 and the control strategy shown in Fig. 2, Fig. 4,1MW concentrated is built in PSCAD
Photovoltaic system and pessimistic concurrency control.Best mode for carrying out the invention is illustrated by emulation.
The peak power of photovoltaic cell is 1MW, maximum power point voltage 0.82kV；The specified work(of concentrated DC converter
Rate is 1MW, and transformer voltage ratio 3.3, high-pressure side rated power is 3kV, in parallel by 30 BFBIC submodules inputs, output string
Connection composition.DC bus-bar voltage is ± 30Kv；AC network rated value 35kV.
Fig. 5 is change photovoltaic parameter, the waveform that maximum power point changes.In 0-6s, photovoltaic environment temperature is 25 DEG C, the sun
Energy radiation intensity is 1000W/m2, and now peak power is about 1MW.Photovoltaic environment temperature is adjusted to 40 DEG C, now, light in 6s
Lie prostrate power output to decline, maximum power point voltage reduces, and photovoltaic cell output voltage can preferably follow command value.Consider
Switching loss and the DC power transmission line loss of power tube, exchange end receiving power are slightly less than photovoltaic generation power.
Fig. 6, Fig. 7 are waveform when verifying pressure, sharing control mode.Gather different BFBIFC modules input currents and defeated
Go out the instantaneous value of voltage.Fig. 6 shows that each module input current is roughly the same；Fig. 7 shows that busbar voltage is stable in 60kV, each module
Output voltage is roughly the same.Control strategy preferably realizes module and presses, flows
Fig. 8 is the power waveform figure of system coordination operation.0-6.5s, exchange end are operated under limit power mode, wattful power
Rate value is 0.75MW, and DC bus-bar voltage fluctuates.Dotted line flow graph shown in Fig. 2 enables, DC/DC control DC bus-bar voltages, photovoltaic
Array off-duty is in maximum power point.In 6.5s-12s, exchange end active power is 1MW, photovoltaic cell Operation at full power.
12s switches MMC working methods, is operated in it and determines DC bus-bar voltage state, and photovoltaic cell is operated in maximum power point, output
Power 1MW.
In summary, control strategy proposed by the invention can apply to photovoltaic DC boosting collect in access system.
Realizing inside DC Module pressure, stream and while photovoltaic maximum power tracing function, it is possible to achieve system coordination is run.
MMC be operated in determine PQ states in the case of DC boosting module can enable coordination strategy, stable DC voltage, realize and coordinate
Operation.
Claims (1)
1. a kind of photovoltaic based on IPOS DC boostings collects access system control method for coordinating, for including DC boosting module
With modular multilevel MMC photovoltaic parallel in system；Wherein, DC boosting module is using full-bridge isolation DC/DC submodule inputs
The structure of series and output-parallel, when receiving end power network needs photovoltaic plant Maximum Power Output, system is operated in maximum power control
Pattern, when receiving end power network can not consume the power that photovoltaic plant is sent completely, system is operated in power limited pattern, corresponding
Control strategy is respectively：
A. maximum power tracing control model
(1) instruction of the maximum photovoltaic power point magnitude of voltage as DC boosting module input voltage is calculated by the use of conductance increment method
Value；
(2) DC boosting module gathers direct current by the way of single current inner loop regulation inside outer voltage and submodule
The input voltage of boost module simultaneously makes the difference itself and maximum power point voltage command value, forms outer voltage through pi regulator, carries
For the command value of input current；Gather the input current of different submodules and respectively compared with input current command value, adjusted through PI
Save device and form independent current inner loop, each input current is followed corresponding command value；
(3) introduce submodule output voltage and press compensation policy, gather the output voltage of each submodule and being averaged for submodule
Output voltage makes the difference, and forms feedback signal through proportional controller, acts on current inner loop, adjust the output voltage values of submodule；
(4) MMC coordinates Reactive Power Control mode, stable DC busbar voltage using DC bus-bar voltage is determined；
B. receiving end grid power definition mode
(1) MMC is switched to the control model for determining active power and reactive power；
(2) DC boosting module controller collection DC bus-bar voltage, makes the difference with command value, when difference exceeds certain limit, to
Maximum power control device sends disabling signal, and the outer voltage controller of maximum power tracing is disabled；
(3) DC bus-bar voltage instantaneous value is gathered compared with command value, is formed DC bus-bar voltage closed loop through proportional controller, is carried
For the command value of submodule current controller；
(4) current inner loop controller inside submodule and pressure compensation control do not change, identical with maximum power tracing pattern.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710976550.0A CN107634541A (en) | 2017-10-19 | 2017-10-19 | Photovoltaic based on IPOS DC boostings collects access system control method for coordinating |
| PCT/CN2018/074326 WO2019075955A1 (en) | 2017-10-19 | 2018-01-26 | Coordination control method for input-parallel output-series direct current boost-based photovoltaic collection access system |
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| CN201710976550.0A CN107634541A (en) | 2017-10-19 | 2017-10-19 | Photovoltaic based on IPOS DC boostings collects access system control method for coordinating |
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| CN108462202A (en) * | 2018-02-07 | 2018-08-28 | 国网浙江省电力有限公司 | A kind of more level DCs in new energy base collect system |
| CN108879623A (en) * | 2018-06-13 | 2018-11-23 | 南京南瑞继保电气有限公司 | A kind of multi-voltage grade DC grid system and control guard method |
| CN109560539A (en) * | 2018-10-26 | 2019-04-02 | 珠海瓦特电力设备有限公司 | A kind of method, circuit and the device of photovoltaic direct-furnish DC power system power distribution |
| CN109921662A (en) * | 2019-03-25 | 2019-06-21 | 哈工大（张家口）工业技术研究院 | The control method of high-frequency isolation type variable topology AC-DC converter |
| CN110719028A (en) * | 2018-07-13 | 2020-01-21 | 台达电子工业股份有限公司 | Compensation control system and method |
| CN110829798A (en) * | 2019-11-07 | 2020-02-21 | 山东艾诺仪器有限公司 | Module series type high-voltage direct-current power supply |
| CN110838792A (en) * | 2019-11-08 | 2020-02-25 | 中国船舶重工集团公司第七一九研究所 | IPOS direct current converter self-adaptive variable parameter output voltage-sharing control method |
| CN112039340A (en) * | 2020-08-26 | 2020-12-04 | 武汉大学 | Voltage balancing topology and control method adopting bidirectional buck-boost and series LC |
| CN112054682A (en) * | 2020-09-22 | 2020-12-08 | 曲阜师范大学 | Current sharing control method for flexible direct-current transmission direct-current converter of offshore wind farm |
| CN114709811A (en) * | 2022-06-06 | 2022-07-05 | 国网江西省电力有限公司南昌供电分公司 | Control method for IPOS (internet protocol operating system) cascade structure module in photovoltaic direct-current collection system |
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Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108462202A (en) * | 2018-02-07 | 2018-08-28 | 国网浙江省电力有限公司 | A kind of more level DCs in new energy base collect system |
| CN108879623A (en) * | 2018-06-13 | 2018-11-23 | 南京南瑞继保电气有限公司 | A kind of multi-voltage grade DC grid system and control guard method |
| US11342744B2 (en) | 2018-06-13 | 2022-05-24 | Nr Electric Co., Ltd | Multi-voltage level direct current grid system and control protection method |
| CN108879623B (en) * | 2018-06-13 | 2020-06-05 | 南京南瑞继保电气有限公司 | Multi-voltage-level direct current network system and control protection method |
| CN110719028B (en) * | 2018-07-13 | 2021-03-19 | 台达电子工业股份有限公司 | Compensation control system and method |
| CN110719028A (en) * | 2018-07-13 | 2020-01-21 | 台达电子工业股份有限公司 | Compensation control system and method |
| US11139669B2 (en) | 2018-07-13 | 2021-10-05 | Delta Electronics, Inc. | Converter system and method |
| CN109560539A (en) * | 2018-10-26 | 2019-04-02 | 珠海瓦特电力设备有限公司 | A kind of method, circuit and the device of photovoltaic direct-furnish DC power system power distribution |
| CN109560539B (en) * | 2018-10-26 | 2023-09-29 | 珠海瓦特电力设备有限公司 | Method, circuit and device for distributing power of photovoltaic direct-current power supply system |
| CN109921662A (en) * | 2019-03-25 | 2019-06-21 | 哈工大（张家口）工业技术研究院 | The control method of high-frequency isolation type variable topology AC-DC converter |
| CN110829798B (en) * | 2019-11-07 | 2021-06-15 | 山东艾诺仪器有限公司 | Module series type high-voltage direct-current power supply |
| CN110829798A (en) * | 2019-11-07 | 2020-02-21 | 山东艾诺仪器有限公司 | Module series type high-voltage direct-current power supply |
| CN110838792B (en) * | 2019-11-08 | 2020-09-04 | 中国船舶重工集团公司第七一九研究所 | IPOS direct current converter self-adaptive variable parameter output voltage-sharing control method |
| CN110838792A (en) * | 2019-11-08 | 2020-02-25 | 中国船舶重工集团公司第七一九研究所 | IPOS direct current converter self-adaptive variable parameter output voltage-sharing control method |
| CN112039340A (en) * | 2020-08-26 | 2020-12-04 | 武汉大学 | Voltage balancing topology and control method adopting bidirectional buck-boost and series LC |
| CN112054682A (en) * | 2020-09-22 | 2020-12-08 | 曲阜师范大学 | Current sharing control method for flexible direct-current transmission direct-current converter of offshore wind farm |
| CN112054682B (en) * | 2020-09-22 | 2022-06-14 | 曲阜师范大学 | Current sharing control method for flexible direct-current transmission direct-current converter of offshore wind farm |
| CN114709811A (en) * | 2022-06-06 | 2022-07-05 | 国网江西省电力有限公司南昌供电分公司 | Control method for IPOS (internet protocol operating system) cascade structure module in photovoltaic direct-current collection system |
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