CN106602608B - Photovoltaic energy storage system and its progress control method in a kind of DC distribution net - Google Patents
Photovoltaic energy storage system and its progress control method in a kind of DC distribution net Download PDFInfo
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- CN106602608B CN106602608B CN201710022427.5A CN201710022427A CN106602608B CN 106602608 B CN106602608 B CN 106602608B CN 201710022427 A CN201710022427 A CN 201710022427A CN 106602608 B CN106602608 B CN 106602608B
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- 238000004146 energy storage Methods 0.000 title claims abstract description 60
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000012544 monitoring process Methods 0.000 claims description 12
- 238000001514 detection method Methods 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims description 3
- 239000007787 solid Substances 0.000 abstract description 5
- 238000004891 communication Methods 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000002457 bidirectional effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- H02J3/385—
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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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
-
- 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
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Direct Current Feeding And Distribution (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The present invention relates to photovoltaic energy storage system and its operation methods in a kind of DC distribution net, belong to field of power electronics technical field.The system includes DC distribution net, photovoltaic plant module, limited energy-storage module, grid-connected module, main control module；The photovoltaic plant mould and energy-storage module that are connected to low-voltage direct bus are connected with the middle pressure DC bus of DC distribution net by grid-connected module together；Grid-connected module includes DC solid transformer and third dc circuit breaker；Main control module be used to complete overall communication control, the maximum power tracing MPPT of photovoltaic plant module, the charge and discharge control of energy-storage module, in the control of grid-connected module and the DC distribution net photovoltaic energy storage system on-off control.The present invention solves the problems, such as the grid-connected of the grid-connected photovoltaic system of middle low power grade by system and specific method, improves photovoltaic utilization rate, reduces the appearance of " abandoning light " phenomenon.
Description
Technical field
The present invention relates to photovoltaic energy storage system and its progress control methods in a kind of DC distribution net, belong to power electronics neck
Field technique field.
Background technique
Conventional AC power distribution network is faced with power supply capacity deficiency, user requires constantly power quality and power supply reliability
Many severe challenges such as raising, distributed generation resource access.Flexible direct current power distribution network transmit capacity, controllability, power quality and
The levels such as power supply reliability have the performance more excellent than alternating-current system.Flexible direct current power distribution network has obtained widely
Concern and research.
Due to being illuminated by the light the influence of the natural causes such as intensity and temperature, the active power output of photo-voltaic power supply has larger in power station
Fluctuation, thus direct grid-connected operation can generate a series of problems, such as cause operation of power networks is unstable, power supply quality is poor, participate in
Dispatching of power netwoks difficulty etc..The mode for effectively solving the problems, such as this at present is to make photovoltaic and energy storage device phase by increasing energy storage device
In conjunction with.
Simply combining energy storage device and photovoltaic, it doesn't solve the problem fundamentally, when that cannot reach grid-connected and require, meeting
The voltage stabilization that grid side is solved the problems, such as with " abandon light " causes " abandoning light " that large area occur, so-called " abandoning light " refer to by
The photovoltaic electric energy that grid-connected requirement is not achieved is given up, and directly abandons causing the use of the part energy into the waste on the energy.Therefore
It will combine energy storage device and photovoltaic simple combination that can not achieve the effect that the utilization rate for sufficiently improving photovoltaic in other words.
The power quality of photovoltaic plant power supply how had not only been improved, but also photovoltaic plant is enable flexibly to participate in dispatching of power netwoks,
The stability for enhancing operation of power networks is current problem encountered.
Summary of the invention
The technical problem to be solved by the present invention is to improve the energy utilization rate of photovoltaic plant, in view of the shortcomings of the prior art, mentioning
Photovoltaic energy storage system in a kind of DC distribution net out.
In order to solve the above-mentioned technical problem technical solution that the present invention proposes is: photovoltaic energy storage system in a kind of DC distribution net
System, including DC distribution net, photovoltaic plant module, limited energy-storage module, grid-connected module, main control module；
The grid-connected module by be connected to low-voltage direct bus the photovoltaic plant mould and the energy-storage module together with
The middle pressure DC bus of the DC distribution net is connected；
The grid-connected module includes DC solid transformer and third dc circuit breaker；
The third dc circuit breaker is used to that DC bus will to be pressed in DC solid transformer access；
The connection of the photovoltaic plant module and low-voltage direct bus be it is unidirectional, low-voltage direct mother is flowed to by photovoltaic array
The connection of line, the limited energy-storage module and the low-voltage direct bus is two-way, the grid-connected module and affiliated middle straightening
It is two-way for flowing the connection of bus；
The main control module is used to complete overall communication control, the maximum power tracing MPPT of photovoltaic plant module, storage
The on-off control of photovoltaic energy storage system in the charge and discharge control of energy module, the control of grid-connected module and the DC distribution net.
The improvement of above-mentioned technical proposal is: the photovoltaic plant module includes photovoltaic array, Unidirectional direct-current converter and
One dc circuit breaker；First dc circuit breaker is used to the photovoltaic array being linked into low-voltage direct bus, and described first
Unidirectional direct-current converter is connected between dc circuit breaker and the photovoltaic array.
The improvement of above-mentioned technical proposal is: the limited energy-storage module includes battery group, bidirectional, dc variator and
Two dc circuit breakers；Second dc circuit breaker is used to accessing the battery group into low-voltage direct bus, and described second is straight
Stream breaker and the battery group are directly connected to two-way DC converter.
The beneficial effect of the present invention by adopting the above technical scheme is: the present invention by setting and net side to be bi-directionally connected,
So that the power distribution of DC distribution net is more flexible, solves the problems, such as DC distribution net.
The technical problem to be solved by the present invention is to improve the energy utilization rate of photovoltaic plant, in view of the shortcomings of the prior art, mentioning
Out in a direct current power distribution network photovoltaic energy storage system progress control method.
In order to solve the above-mentioned technical problem technical solution that the present invention proposes is: photovoltaic energy storage system in DC distribution net
Progress control method, the method steps are as follows,
Step 1: the active power output of real-time monitoring photovoltaic plant module, the maximum power for carrying out photovoltaic plant module chase after
Track；
Step 2: judging whether the active power output PV of photovoltaic plant module is less than default value PS, if so then execute step
Rapid 3,8 are thened follow the steps if not；
Step 3: judging whether limited energy-storage module is full of, if so then execute step 4, then follow the steps 7 if not；
Step 4: judging whether DC grid busbar voltage is less than the 95% of its rated value, if so then execute step 5, if not
Then follow the steps 6；
Step 5: photovoltaic plant module and limited energy-storage module joint power output, it is grid-connected by the progress of grid-connected module, and execute
Step 9；
Step 6: photovoltaic plant module is individually contributed, grid-connected by the progress of grid-connected module, and executes step 9；
Step 7: photovoltaic plant module charges to limited energy-storage module, grid-connected by the progress of grid-connected module, and executes step
9；
Step 8: sentencing whether limited energy-storage module has discharge capability, if so then execute step 5, then follow the steps 6 if not；
Step 9: the working condition of real-time monitoring medium voltage DC net bus, photovoltaic plant module and limited energy-storage module,
And execute step 10；
Step 10: judging whether system breaks down according to detection, if so then execute step 11, then follow the steps 1 if not；
Step 11: photovoltaic plant module, limited energy-storage module and low-voltage direct bus being disconnected, grid-connected module and middle straightening
It flows bus to disconnect, system is out of service.
The improvement of above-mentioned technical proposal is: the monitoring parameters of step 9 status monitoring include: photovoltaic plant module
Output power PV；The electricity of limited energy-storage module battery pack；The charging and discharging state of limited energy-storage module battery pack；Middle straightening stream is female
The voltage of line.
The beneficial effect of the present invention by adopting the above technical scheme is: this method considers the limitation of existing energy storage device, from
Limited energy-storage module considers, with the suitable method of salary distribution, has both enabled limited energy-storage module to work well, while improving photovoltaic
The power quality of power station power supply can enable photovoltaic plant neatly participate in dispatching of power netwoks, enhance operation of power networks stability, mention
High energy source utilization rate reduces the situation for abandoning light.This method can be improved photovoltaic utilization rate 20% or so.
Detailed description of the invention
The present invention will be further explained below with reference to the attached drawings.
Fig. 1 is the schematic diagram of photovoltaic energy storage system in the DC distribution net of the embodiment of the present invention.
Fig. 2 is the operation control flow chart applied to photovoltaic energy storage system in DC distribution net in Fig. 1.
Specific embodiment
Embodiment
Photovoltaic energy storage system in a kind of DC distribution net of the present embodiment, as shown in Figure 1, including DC distribution net, photovoltaic
Power station module, limited energy-storage module, grid-connected module, main control module；
The grid-connected module by be connected to low-voltage direct bus the photovoltaic plant mould and the energy-storage module together with
The middle pressure DC bus of the DC distribution net is connected；
The grid-connected module includes DC solid transformer and third dc circuit breaker；
The third dc circuit breaker is used to that DC bus will to be pressed in DC solid transformer access；
The connection of the photovoltaic plant module and low-voltage direct bus be it is unidirectional, low-voltage direct mother is flowed to by photovoltaic array
The connection of line, the limited energy-storage module and the low-voltage direct bus is two-way, the grid-connected module and affiliated middle straightening
It is two-way for flowing the connection of bus；
The main control module is used to complete overall communication control, the maximum power tracing MPPT of photovoltaic plant module, storage
The on-off control of photovoltaic energy storage system in the charge and discharge control of energy module, the control of grid-connected module and the DC distribution net.
The photovoltaic plant module includes photovoltaic array, Unidirectional direct-current converter and the first dc circuit breaker；Described first
Dc circuit breaker is used to for the photovoltaic array to be linked into low-voltage direct bus, first dc circuit breaker and the photovoltaic battle array
Unidirectional direct-current converter is connected between column.
The limited energy-storage module includes battery group, bidirectional, dc variator and the second dc circuit breaker；Described second
Dc circuit breaker is used to the battery group accessing low-voltage direct bus, second dc circuit breaker and the battery group
Directly it is connected to two-way DC converter.
As shown in Fig. 2, in the DC distribution net of the present embodiment photovoltaic energy storage system progress control method, this method step
It is as follows,
Step 1: the active power output of real-time monitoring photovoltaic plant module, the maximum power for carrying out photovoltaic plant module chase after
Track；
Step 2: judging whether the active power output PV of photovoltaic plant module is less than default value PS, if so then execute step
Rapid 3,8 are thened follow the steps if not；
Step 3: judging whether limited energy-storage module is full of, if so then execute step 4, then follow the steps 7 if not；
Step 4: judging whether DC grid busbar voltage is less than the 95% of its rated value, if so then execute step 5, if not
Then follow the steps 6；
Step 5: photovoltaic plant module and limited energy-storage module joint power output, it is grid-connected by the progress of grid-connected module, and execute
Step 9；
Step 6: photovoltaic plant module is individually contributed, grid-connected by the progress of grid-connected module, and executes step 9；
Step 7: photovoltaic plant module charges to limited energy-storage module, grid-connected by the progress of grid-connected module, and executes step
9；
Step 8: sentencing whether limited energy-storage module has discharge capability, if so then execute step 5, then follow the steps 6 if not；
Step 9: the working condition of real-time monitoring medium voltage DC net bus, photovoltaic plant module and limited energy-storage module,
And execute step 10；
Step 10: judging whether system breaks down according to detection, if so then execute step 11, then follow the steps 1 if not；
Step 11: photovoltaic plant module, limited energy-storage module and low-voltage direct bus being disconnected, grid-connected module and middle straightening
It flows bus to disconnect, system is out of service.
The improvement of above-mentioned technical proposal is: the monitoring parameters of step 9 status monitoring include: photovoltaic plant module
Output power PV；The electricity of limited energy-storage module battery pack；The charging and discharging state of limited energy-storage module battery pack；Middle straightening stream is female
The voltage of line.
System can be grid-connected according to the progress of pre-set working method, can also be instructed according to upper layer manually to the confession of system
Electric situation is adjusted.When photovoltaic array power generation power momentary fluctuation is larger, by controlling the charge and discharge of energy-storage battery, reach
The effect that photovoltaic goes out fluctuation is stabilized, impact of the output-power fluctuation to DC distribution net is reduced.
The present invention is not limited to the above embodiment.All technical solutions formed using equivalent replacement, are all fallen within the present invention and wanted
The protection scope asked.
Claims (2)
1. the progress control method of photovoltaic energy storage system in a kind of DC distribution net, it is characterised in that the method steps are as follows:
Step 1: the active power output of real-time monitoring photovoltaic plant module carries out the maximum power tracing of photovoltaic plant module；
Step 2: judge whether the active power output PV of photovoltaic plant module is less than default value PS, if so then execute step 3,
8 are thened follow the steps if not；
Step 3: judging whether limited energy-storage module is full of, if so then execute step 4, then follow the steps 7 if not；
Step 4: judging whether DC grid busbar voltage is less than the 95% of its rated value, if so then execute step 5, if otherwise holding
Row step 6；
Step 5: photovoltaic plant module and limited energy-storage module joint power output, it is grid-connected by the progress of grid-connected module, and execute step
9；
Step 6: photovoltaic plant module is individually contributed, grid-connected by the progress of grid-connected module, and executes step 9；
Step 7: photovoltaic plant module charges to limited energy-storage module, grid-connected by the progress of grid-connected module, and executes step 9；
Step 8: sentencing whether limited energy-storage module has discharge capability, if so then execute step 5, then follow the steps 6 if not；
Step 9: the working condition of real-time monitoring medium voltage DC net bus, photovoltaic plant module and limited energy-storage module, and hold
Row step 10；
Step 10: judging whether system breaks down according to detection, if so then execute step 11, then follow the steps 1 if not；
Step 11: photovoltaic plant module, limited energy-storage module and low-voltage direct bus being disconnected, grid-connected module and middle straightening stream are female
Line disconnects, and system is out of service.
2. according to claim 1 in DC distribution net photovoltaic energy storage system progress control method, it is characterised in that: it is described
Step 9 status monitoring monitoring parameters include: photovoltaic plant module output power PV；The electricity of limited energy-storage module battery pack
Amount；The charging and discharging state of limited energy-storage module battery pack；The voltage of middle pressure DC bus.
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Families Citing this family (8)
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| US10971934B2 (en) | 2018-12-31 | 2021-04-06 | Abb Schweiz Ag | Distribution networks with flexible direct current interconnection system |
| US11121543B2 (en) | 2018-12-31 | 2021-09-14 | Abb Schweiz Ag | Fault mitigation in medium voltage distribution networks |
| US10819112B1 (en) | 2019-03-27 | 2020-10-27 | Abb Schweiz Ag | Feeder line fault response using direct current interconnection system |
| US11031773B2 (en) | 2019-03-27 | 2021-06-08 | Abb Power Grids Switzerland Ag | Transformer isolation response using direct current link |
| CN111864780B (en) * | 2020-08-19 | 2022-02-25 | 南京莱迪新能源科技有限公司 | Hybrid mobile energy storage power station |
| CN114188982B (en) * | 2021-12-15 | 2024-03-19 | 山东大学 | Working method of physically synchronous light-storage hybrid power generation system |
| CN117154789B (en) * | 2023-08-22 | 2024-07-26 | 华能罗源发电有限责任公司 | Medium-voltage direct-current energy storage system for thermal power plant |
| CN117293890B (en) * | 2023-11-24 | 2024-03-22 | 国网浙江省电力有限公司电力科学研究院 | Multi-voltage-level flexible-direct system and coordination control method between buses thereof |
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