CN106712102A - Control system and method for reducing light abandoning power limit of photovoltaic power station - Google Patents
Control system and method for reducing light abandoning power limit of photovoltaic power station Download PDFInfo
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- 238000004146 energy storage Methods 0.000 claims abstract description 25
- 238000012544 monitoring process Methods 0.000 claims abstract description 7
- 230000001629 suppression Effects 0.000 abstract description 2
- 230000005611 electricity Effects 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 2
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- 238000005516 engineering process Methods 0.000 description 1
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Classifications
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- H02J3/383—
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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
- H02J3/28—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
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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
- 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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- Supply And Distribution Of Alternating Current (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a control system and method for reducing the light abandoning power limit of a photovoltaic power station. The system comprises a photovoltaic grid-connected inverter, a light storage integrated machine and a monitoring and data acquisition system, wherein the input end of the photovoltaic grid-connected inverter receives photovoltaic input signals, and the output end of the photovoltaic grid-connected inverter is connected with a grid; the light storage integrated machine is connected in parallel to two ends of the photovoltaic grid-connected inverter, the energy storage end of the light storage integrated machine receives the photovoltaic input signals, and the energy fluctuation suppression end of the light storage integrated machine is connected with the grid; and the monitoring and data acquisition system is used for receiving a power limit instruction sent by the power station to the photovoltaic grid-connected inverter, receiving a start/ stop power limit instruction sent by an external dispatching system and controlling the light storage integrated machine to enter/exit a power limit state according to the start/ stop power limit instruction. The system and the method solve the problems that the photovoltaic energy is wasted when the dispatching system sends the power limit instruction and the photovoltaic energy fluctuates during normal power supply, improve the quality of power generated by the power station, and reduce the impact to the grid.
Description
Technical field
Control system and method that light is rationed the power supply are abandoned the present invention relates to a kind of reduction photovoltaic plant.
Background technology
Photovoltaic plant refers to a kind of using solar energy, using electronic components such as special material crystal silicon plate, inverters
The generating system of composition, the photovoltaic generating system for being connected with power network and being transmitted electric power to power network.Photovoltaic plant is to belong to state at present
Family encourages the maximum green electric power supply exploitation energy project of dynamics.
The main operational principle of existing photovoltaic plant is as follows：Direct sunlight is converted into direct current by solar photovoltaic assembly
Electricity, photovoltaic group string accesses DC power distribution cabinet by the way that direct current conflux case is in parallel, inverter direct-flow input end is accessed after confluxing, by direct current
Electricity is changed into alternating current, and inverter ac output end incoming transport power distribution cabinet is directly incorporated into user side through AC power distribution cabinet/AC distribution panel.
However, current photovoltaic plant abandons wind abandons optical phenomenon seriously, refer to when state's net province's scheduling system issues limit power to power station
When making, photovoltaic energy is wasted.Existing most power stations be able to will can only be fallen to discard, and not meet the new energy policy of country,
Cause great energy waste.
The content of the invention
It is an object of the invention to overcome the deficiencies in the prior art, there is provided a kind of reduction photovoltaic plant abandons the control that light is rationed the power supply
System and method, what photovoltaic energy was wasted when the scheduling system for solving prior art issues limit power instruction to power station asks
Topic.
The purpose of the present invention is achieved through the following technical solutions：A kind of reduction photovoltaic plant abandons the control that light is rationed the power supply
System, including：
Photovoltaic combining inverter：Input receives photovoltaic input signal, and output end is connected with power network；
Light stores up all-in-one：The two ends of photovoltaic combining inverter are parallel to, energy storage end receives photovoltaic input signal, and energy hunting suppresses
End is connected with power network；
Supervisory control and data acqui sition system：For receiving the power limited instruction assigned to photovoltaic combining inverter in power station, receiving outer
Ministry dispatching system send beginning/stoppings ration the power supply power instruction and according to start/stop ration the power supply power instruction control light store up one
The into/out state of rationing the power supply of body machine；
Wherein, when supervisory control and data acqui sition system control enters into light storage all-in-one rations the power supply state, described monitoring and number
According to the limit that acquisition system is used to gather photovoltaic input signal power value P1, obtain grid-connected inverse electrical equipment according to power instruction of rationing the power supply
Electric output power value P2, according to P1/P2/ maximum photovoltaic power points when the battery SOC of power P 3/ control light store up all-in-one energy storage
Power P 4；
When supervisory control and data acqui sition system is exited into light storage all-in-one rations the power supply state, described supervisory control and data acqui sition system
For gathering the real output value P6 of grid-connected inverse electrical equipment, according to power limited instruction acquisition power station to grid-connected inverse
Become the power P 5 of device requirement, controlled the fluctuation of light storage all-in-one to suppress power output P7 according to P5/P6/ battery SOCs.
Further, described light storage all-in-one include a DC/DC modules, the 2nd DC/DC modules, DC/AC modules and
Battery module, the input of described DC/DC modules receives photovoltaic input signal, the output end of a DC/DC respectively with
2nd DC/DC modules, the connection of DC/AC modules, the 2nd DC/DC modules are bi-directionally connected with battery module, the 2nd DC/DC modules it is defeated
Go out end to be also connected with DC/AC modules, the output end of DC/AC modules is connected with power network.
A kind of reduction photovoltaic plant abandons the control method that light is rationed the power supply, and comprises the following steps：Work as supervisory control and data acqui sition system
Receive outer ministry dispatching system transmission starts power instruction of rationing the power supply, then enter sub-step of rationing the power supply；Do not received after initialization
What outer ministry dispatching system sent start rations the power supply power instruction or when supervisory control and data acqui sition system receives outer ministry dispatching system
The stopping of transmission ration the power supply power instruction when, into fluctuation suppress sub-step；Described sub-step of rationing the power supply includes following sub-step：
S11：Supervisory control and data acqui sition system obtains photovoltaic in photovoltaic input signal power value P1, power instruction of rationing the power supply simultaneously respectively
Ration the power supply output power value P2 of the net against electrical equipment；
S12：According to P1 and P2, surplus power P '=P1-P2 is calculated；
S13：The size of the power P 3 when comparing surplus power P ' with maximum photovoltaic power point：If P3 is less than P ', P3 assignment
To the energy storage power P 4 that light is stored up all-in-one, P ' otherwise is assigned to store up light the energy storage power P 4 of all-in-one；
S14：Judge whether battery SOC reaches 100%：If it is enter after the energy storage power P 4 of light storage all-in-one being entered as into 0
Step S15, is otherwise directly entered step S15；
S15：The energy storage power P 4 of light storage all-in-one is assigned to light storage all-in-one；
Described fluctuation suppresses sub-step includes following sub-step：
S21：The real output value P6 of the grid-connected inverse electrical equipment of supervisory control and data acqui sition system collection, while according to power station pair
The power limited instruction that photovoltaic combining inverter is assigned obtains power P 5 of the power station to photovoltaic combining inverter requirement；
S22：According to P5 and P6, the fluctuation for calculating light storage all-in-one suppresses power output P7=P5-P6；
S23：Judge whether battery SOC reaches 0%：If it is the fluctuation of light storage all-in-one is suppressed into power output P7 and is entered as 0
Enter step S24 afterwards, be otherwise directly entered step S24；
S24：The fluctuation of light storage all-in-one is suppressed into power output P7 and is assigned to light storage all-in-one.
Further, described light storage all-in-one include a DC/DC modules, the 2nd DC/DC modules, DC/AC modules and
Battery module, the input of described DC/DC modules receives photovoltaic input signal, the output end of a DC/DC respectively with
2nd DC/DC modules, the connection of DC/AC modules, the 2nd DC/DC modules are bi-directionally connected with battery module, the 2nd DC/DC modules it is defeated
Go out end to be also connected with DC/AC modules, the output end of DC/AC modules is connected with power network；
When be limited electronics step when, photovoltaic input signal passes sequentially through a DC/DC modules and the 2nd DC/DC modules to battery mould
Block carries out energy storage；When for fluctuation suppress sub-step when, fluctuation suppress signal from battery module and pass sequentially through the 2nd DC/DC and
DC/AC modules are exported to power network.
The beneficial effects of the invention are as follows：
（1）The present invention solves photovoltaic energy when scheduling system issues limit power instruction to power station and is wasted and normal power supply
The problem of Shi Guangfu energy huntings, improves the quality of power supply that power station sends, and reduces the impact to bulk power grid；Specific implementation
For：When the limit power instruction that scheduling system is issued is received, extra power is carried out into energy storage to light storage all-in-one；When non-
Limit power phase, will store up getable energy on photovoltaic fluctuation and is suppressed.
（2）All-in-one is being stored up by installing light additional in every inverter side, alternating current-direct current side is being directly connected to, can be in photovoltaic
It is effective to solve to abandon the phenomenon that light is rationed the power supply by unnecessary energy stores when power station is rationed the power supply, the income in power station is not only increased,
And do not influence original electric power station system equipment to work, save repeated construction cost.
Brief description of the drawings
Fig. 1 is block diagram of the present invention；
Fig. 2 is the inventive method flow chart.
Specific embodiment
Technical scheme is described in further detail below in conjunction with the accompanying drawings：
As shown in figure 1, present embodiments providing a kind of reduction photovoltaic plant abandons the control system that light is rationed the power supply, the system is broadly divided into
Two pieces, first piece is existing photovoltaic power station system, and second piece is that increased light stores up all-in-one, is specifically included：
Photovoltaic combining inverter（PVI）：Input receives photovoltaic input signal, and output end is connected with power network；
Light stores up all-in-one：The two ends of photovoltaic combining inverter are parallel to, energy storage end receives photovoltaic input signal, and energy hunting suppresses
End is connected with power network；
Supervisory control and data acqui sition system：For receiving the power limited instruction assigned to photovoltaic combining inverter in power station, receiving outer
Ministry dispatching system send beginning/stoppings ration the power supply power instruction and according to start/stop ration the power supply power instruction control light store up one
The into/out state of rationing the power supply of body machine；
Wherein, when supervisory control and data acqui sition system control enters into light storage all-in-one rations the power supply state, described monitoring and number
According to the limit that acquisition system is used to gather photovoltaic input signal power value P1, obtain grid-connected inverse electrical equipment according to power instruction of rationing the power supply
Electric output power value P2, according to P1/P2/ maximum photovoltaic power points when the battery SOC of power P 3/ control light store up all-in-one energy storage
Power P 4；
Wherein, during maximum photovoltaic power point power P 3 typically by two kinds of approach or is obtained, and a kind of is the photovoltaic power prediction installed
The photovoltaic that system is directly given under current sunshine condition estimates output；A kind of is in the condition without photovoltaic power forecasting system
Under, it is the peak power of equipment directly to P3, to the power setting of 500KW if 500KW, equipment can be automatically according to present battery
Acceptable energy storage power（P4’）With the charge power of the given batteries of P3.
When supervisory control and data acqui sition system is exited into light storage all-in-one rations the power supply state, described Supervisory control and data acquisition
System is used to gathering the real output value P6 of grid-connected inverse electrical equipment, obtains power station to photovoltaic simultaneously according to power limited instruction
The power P 5 of net inverter requirement, the fluctuation suppression power output P7 that light storage all-in-one is controlled according to P5/P6/ battery SOCs.
Preferably, described light storage all-in-one includes a DC/DC modules, the 2nd DC/DC modules, DC/AC modules and electricity
Pond module, the input of described DC/DC modules receives photovoltaic input signal, and the output end of a DC/DC is respectively with the
Two DC/DC modules, the connection of DC/AC modules, the 2nd DC/DC modules are bi-directionally connected with battery module, the output of the 2nd DC/DC modules
End is also connected with DC/AC modules, and the output end of DC/AC modules is connected with power network.Specifically, when to ration the power supply, photovoltaic input letter
Number pass sequentially through a DC/DC modules and the 2nd DC/DC modules carries out energy storage to battery module；When suppressing for fluctuation, fluctuation
Suppress signal from battery module and pass sequentially through the 2nd DC/DC and DC/AC modules and export to power network.
As shown in Fig. 2 the present embodiment additionally provides a kind of reduction photovoltaic plant abandons the control method that light is rationed the power supply, including it is following
Step：Start power instruction of rationing the power supply when what supervisory control and data acqui sition system received that outer ministry dispatching system sends, then enter and ration the power supply
Sub-step；Starting of not receiving that outer ministry dispatching system sends after initialization is rationed the power supply power instruction or when monitoring and data
Acquisition system receive the stopping that outer ministry dispatching system sends ration the power supply power instruction when, suppress sub-step into fluctuation；Described
Sub-step of rationing the power supply includes following sub-step：
S11：Supervisory control and data acqui sition system obtains photovoltaic in photovoltaic input signal power value P1, power instruction of rationing the power supply simultaneously respectively
Ration the power supply output power value P2 of the net against electrical equipment；
S12：According to P1 and P2, surplus power P '=P1-P2 is calculated；
S13：The size of the power P 3 when comparing surplus power P ' with maximum photovoltaic power point：If P3 is less than P ', P3 assignment
To the energy storage power P 4 that light is stored up all-in-one, P ' otherwise is assigned to store up light the energy storage power P 4 of all-in-one；
S14：Judge whether battery SOC reaches 100%：If it is enter after the energy storage power P 4 of light storage all-in-one being entered as into 0
Step S15, is otherwise directly entered step S15；
S15：The energy storage power P 4 of light storage all-in-one is assigned to light storage all-in-one；
Described fluctuation suppresses sub-step includes following sub-step：
S21：The real output value P6 of the grid-connected inverse electrical equipment of supervisory control and data acqui sition system collection, while according to power station pair
The power limited instruction that photovoltaic combining inverter is assigned obtains power P 5 of the power station to photovoltaic combining inverter requirement；
S22：According to P5 and P6, the fluctuation for calculating light storage all-in-one suppresses power output P7=P5-P6；
S23：Judge whether battery SOC reaches 0%：If it is the fluctuation of light storage all-in-one is suppressed into power output P7 and is entered as 0
Enter step S24 afterwards, be otherwise directly entered step S24；
S24：The fluctuation of light storage all-in-one is suppressed into power output P7 and is assigned to light storage all-in-one.
Preferably, described light storage all-in-one includes a DC/DC modules, the 2nd DC/DC modules, DC/AC modules and electricity
Pond module, the input of described DC/DC modules receives photovoltaic input signal, and the output end of a DC/DC is respectively with the
Two DC/DC modules, the connection of DC/AC modules, the 2nd DC/DC modules are bi-directionally connected with battery module, the output of the 2nd DC/DC modules
End is also connected with DC/AC modules, and the output end of DC/AC modules is connected with power network；Specifically, when be limited electronics step when, photovoltaic
Input signal passes sequentially through a DC/DC modules and the 2nd DC/DC modules and carries out energy storage to battery module；When be fluctuation repressor
During step, fluctuation suppresses signal from battery module and passes sequentially through the 2nd DC/DC and DC/AC modules and export to power network.
Specifically, the power that scheduling system is handed down to light storage all-in-one is DC side power（Photovoltaic DC/DC invariable power controls
System, battery DC/DC stabilization busbar voltages）：When state's net saves scheduling system does not issue limit power instruction to power station, the system will be straight
Stream power is disposed as 0, it is ensured that the electricity of all photovoltaic systems is all put on power network, it is ensured that photovoltaic is completely sent out；When state's net saves scheduling system
Unite to power station issue limit power instruction when, the system will be according to photovoltaic power forecasting system（If any）, the chargeable work(of present battery
The rate initial stage gives a dc power value, then the reality output adjustment dc power according to photovoltaic DC-to-AC converter, to reach maximum
Photovoltaic utilization rate.General way is that the limitation power required with the current power output of photovoltaic-province's tune is the defeated of DC side
Enter power；Then the power for being allowed further according to actual photovoltaic power and battery does closed-loop control, allows the power of DC side to reach
Maximum.
Claims (4)
1. a kind of reduction photovoltaic plant abandons the control system that light is rationed the power supply, it is characterised in that：Including：
Photovoltaic combining inverter：Input receives photovoltaic input signal, and output end is connected with power network；
Light stores up all-in-one：The two ends of photovoltaic combining inverter are parallel to, energy storage end receives photovoltaic input signal, and energy hunting suppresses
End is connected with power network；
Supervisory control and data acqui sition system：For receiving the power limited instruction assigned to photovoltaic combining inverter in power station, receiving outer
Ministry dispatching system send beginning/stoppings ration the power supply power instruction and according to start/stop ration the power supply power instruction control light store up one
The into/out state of rationing the power supply of body machine；
Wherein, when supervisory control and data acqui sition system control enters into light storage all-in-one rations the power supply state, described monitoring and number
According to the limit that acquisition system is used to gather photovoltaic input signal power value P1, obtain grid-connected inverse electrical equipment according to power instruction of rationing the power supply
Electric output power value P2, according to P1/P2/ maximum photovoltaic power points when the battery SOC of power P 3/ control light store up all-in-one energy storage
Power P 4；
When supervisory control and data acqui sition system is exited into light storage all-in-one rations the power supply state, described supervisory control and data acqui sition system
For gathering the real output value P6 of grid-connected inverse electrical equipment, according to power limited instruction acquisition power station to grid-connected inverse
Become the power P 5 of device requirement, controlled the fluctuation of light storage all-in-one to suppress power output P7 according to P5/P6/ battery SOCs.
2. a kind of reduction photovoltaic plant according to claim 1 abandons the control system that light is rationed the power supply, it is characterised in that：Described
Light storage all-in-one includes a DC/DC modules, the 2nd DC/DC modules, DC/AC modules and battery module, a described DC/DC
The input of module receives photovoltaic input signal, and the output end of a DC/DC connects with the 2nd DC/DC modules, DC/AC modules respectively
Connect, the 2nd DC/DC modules are bi-directionally connected with battery module, the output end of the 2nd DC/DC modules is also connected with DC/AC modules, DC/
The output end of AC modules is connected with power network.
3. a kind of reduction photovoltaic plant abandons the control method that light is rationed the power supply, it is characterised in that：Comprise the following steps：When monitoring and data
What acquisition system received that outer ministry dispatching system sends starts power instruction of rationing the power supply, then enter sub-step of rationing the power supply；After initialization
Starting of not receiving that outer ministry dispatching system sends is rationed the power supply power instruction or when supervisory control and data acqui sition system receives outside
Scheduling system send stopping ration the power supply power instruction when, into fluctuation suppress sub-step；Described sub-step of rationing the power supply includes following
Sub-step：
S11：Supervisory control and data acqui sition system obtains photovoltaic in photovoltaic input signal power value P1, power instruction of rationing the power supply simultaneously respectively
Ration the power supply output power value P2 of the net against electrical equipment；
S12：According to P1 and P2, surplus power P '=P1-P2 is calculated；
S13：The size of the power P 3 when comparing surplus power P ' with maximum photovoltaic power point：If P3 is less than P ', P3 assignment
To the energy storage power P 4 that light is stored up all-in-one, P ' otherwise is assigned to store up light the energy storage power P 4 of all-in-one；
S14：Judge whether battery SOC reaches 100%：If it is enter after the energy storage power P 4 of light storage all-in-one being entered as into 0
Step S15, is otherwise directly entered step S15；
S15：The energy storage power P 4 of light storage all-in-one is assigned to light storage all-in-one；
Described fluctuation suppresses sub-step includes following sub-step：
S21：The real output value P6 of the grid-connected inverse electrical equipment of supervisory control and data acqui sition system collection, while according to power station pair
The power limited instruction that photovoltaic combining inverter is assigned obtains power P 5 of the power station to photovoltaic combining inverter requirement；
S22：According to P5 and P6, the fluctuation for calculating light storage all-in-one suppresses power output P7=P5-P6；
S23：Judge whether battery SOC reaches 0%：If it is the fluctuation of light storage all-in-one is suppressed into power output P7 and is entered as 0
Enter step S24 afterwards, be otherwise directly entered step S24；
S24：The fluctuation of light storage all-in-one is suppressed into power output P7 and is assigned to light storage all-in-one.
4. a kind of reduction photovoltaic plant according to claim 3 abandons the control method that light is rationed the power supply, it is characterised in that：Described
Light storage all-in-one includes a DC/DC modules, the 2nd DC/DC modules, DC/AC modules and battery module, a described DC/DC
The input of module receives photovoltaic input signal, and the output end of a DC/DC connects with the 2nd DC/DC modules, DC/AC modules respectively
Connect, the 2nd DC/DC modules are bi-directionally connected with battery module, the output end of the 2nd DC/DC modules is also connected with DC/AC modules, DC/
The output end of AC modules is connected with power network；
When be limited electronics step when, photovoltaic input signal passes sequentially through a DC/DC modules and the 2nd DC/DC modules to battery mould
Block carries out energy storage；When for fluctuation suppress sub-step when, fluctuation suppress signal from battery module and pass sequentially through the 2nd DC/DC and
DC/AC modules are exported to power network.
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| CN201710139061.XA CN106712102B (en) | 2017-03-09 | 2017-03-09 | Control system and method for reducing light abandoning and electricity limiting of photovoltaic power station |
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| CN201710139061.XA CN106712102B (en) | 2017-03-09 | 2017-03-09 | Control system and method for reducing light abandoning and electricity limiting of photovoltaic power station |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108879778A (en) * | 2018-07-27 | 2018-11-23 | 国网河南节能服务有限公司 | Battery energy storage monitoring method and system, battery energy storage framework |
| CN109888827A (en) * | 2019-03-13 | 2019-06-14 | 阳光电源股份有限公司 | Photovoltaic combining inverter power limitation method, device, controller and inverter |
| WO2020077786A1 (en) * | 2018-10-17 | 2020-04-23 | 珠海格力电器股份有限公司 | Energy control method and device, energy management system, and storage medium |
| CN111971895A (en) * | 2018-03-05 | 2020-11-20 | 瓦锡兰北美有限公司 | Apparatus, device and computer-implemented method for controlling a power plant system |
| CN114079294A (en) * | 2021-11-18 | 2022-02-22 | 许继集团有限公司 | Photovoltaic power station centralized control method and system and electronic equipment |
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| CN109888827B (en) * | 2019-03-13 | 2020-11-10 | 阳光电源股份有限公司 | Photovoltaic grid-connected inverter power limiting method and device, controller and inverter |
| CN114079294A (en) * | 2021-11-18 | 2022-02-22 | 许继集团有限公司 | Photovoltaic power station centralized control method and system and electronic equipment |
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