CN108092313B - Solar power generation system - Google Patents
Solar power generation system Download PDFInfo
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- CN108092313B CN108092313B CN201711430319.8A CN201711430319A CN108092313B CN 108092313 B CN108092313 B CN 108092313B CN 201711430319 A CN201711430319 A CN 201711430319A CN 108092313 B CN108092313 B CN 108092313B
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- power
- battery pack
- solar panel
- lower limit
- solar
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- 238000010248 power generation Methods 0.000 title claims abstract description 17
- 238000007599 discharging Methods 0.000 claims abstract description 25
- 238000004364 calculation method Methods 0.000 claims 2
- 238000002360 preparation method Methods 0.000 claims 1
- 230000005611 electricity Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
Classifications
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- H02J3/385—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
- H02S40/30—Electrical components
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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
- H02J3/388—Islanding, i.e. disconnection of local power supply from the network
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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
Landscapes
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The present invention provides a solar power generation system, comprising: the controller is connected to the at least one solar cell panel, the battery pack is connected between the one or more electrical appliances and the at least one solar cell panel to receive charging power of the solar cell panel and supply power to the electrical appliances, and the controller is further suitable for controlling charging and discharging of the battery pack so that the battery pack can ensure that the electric quantity of the battery pack is not lower than a preset discharging threshold when the battery pack supplies power to the one or more electrical appliances, and the at least one solar cell panel can ensure that the electric quantity of the battery pack is not higher than a preset charging threshold when the battery pack is charged. The invention effectively controls the power generation and distribution of the solar power generation system with the battery pack, and greatly improves the utilization efficiency of solar energy while protecting the battery.
Description
Technical Field
The present invention relates generally to the field of distributed power, and more particularly to a solar power generation system.
Background
Distributed power is applied more and more widely, and for example, a solar power generation system starts to gradually enter a family, and becomes an important function mode of an area with sufficient sunlight. When the solar power generation system is used as a distributed power system, the solar power generation system generally comprises a solar cell panel, a storage battery pack, a power utilization load and the like, and when the storage battery pack is charged, the battery is damaged by overcharge and overdischarge, so that the economic burden on the distributed power system is obviously increased, and the battery is changed more frequently.
Therefore, it is necessary to prevent the overcharge and overdischarge conditions, for example, a threshold is set to stop charging and discharging, the setting of the threshold is sometimes not completely accurate in practice, for example, when the threshold is reached, the use plan of the electrical appliance is such that the charging is only temporarily near the threshold, so that the charging does not need to be stopped, because the short slight exceeding of the threshold does not affect the service life of the battery, and the stopping of the charging affects the charging time length of the battery, so that the power supply of the electrical appliance cannot be guaranteed. For example, if an air conditioner needs to be opened all night, if the battery cannot guarantee the power supply of the air conditioner, especially when the distributed system is an island system, the power utilization of the air conditioner cannot be continued until the day of the next day is sufficient. Resulting in an extreme degradation of the user experience.
Similarly, there is a similar situation when discharging, and when discharging to the threshold value, the power utilization plan of the electric appliance and the duration of sunshine can ensure that the electric appliance is only temporarily near the threshold value, and the discharging can be not stopped, thereby ensuring the continuous use of the electric appliance.
Based on the above thought, the applicant proposes a technical solution of the present invention to solve the above technical problem or to achieve the above technical idea.
Disclosure of Invention
The present invention provides a solar power generation system, comprising: at least one solar panel, a battery pack, one or more appliances, at least one ceiling sensor, and a controller connected to the at least one solar panel, the battery pack being connected between the one or more appliances and the at least one solar panel to accept charging power from the solar panel and to power the one or more appliances, the controller being adapted to implement a Maximum Power Point Tracking (MPPT) algorithm for the at least one solar panel, the MPPT algorithm being configured to maximize a power output of the at least one solar panel to direct charging of the battery pack from power from the at least one solar panel; the controller is further adapted to control charging and discharging of the battery pack so that the battery pack guarantees that the electric quantity of the battery pack is not lower than a preset discharging threshold when the battery pack supplies power to the one or more electrical appliances, and guarantees that the electric quantity of the battery pack is not higher than a preset charging threshold when the at least one solar panel charges the battery pack; wherein the controller derives an upper and lower limit power indicator from the at least one upper and lower limit sensor and allows the battery pack to charge below or temporarily below the discharge threshold when discharged if the upper and lower limit power indicator indicates that sufficient power is coming from or will come from the at least one solar panel to recharge the battery pack and allows the battery pack to charge above or temporarily above the charge threshold when charged if the upper and lower limit power indicator indicates that sufficient power demand is coming from or will come from the at least one appliance.
And the upper and lower limit sensors are further used for acquiring timing information of the at least one electric appliance and acquiring the information of the residual sunshine duration of the day.
Further, the discharge threshold is 20% of the total capacity of the battery pack.
Furthermore, the charging threshold value is 80-95% of the total capacity of the battery pack.
Furthermore, the upper and lower limit sensors collect the timing information of the at least one electrical appliance and the information of the remaining sunshine duration of the day so as to obtain the required electric power before the sunshine of the second day and the solar electric power which can be generated by the remaining sunshine duration of the day, and generate the upper and lower limit power indicators.
Further, the solar power generation system is an island system.
Other systems, methods, and/or features of the present embodiments will become apparent to those skilled in the art upon review of the following detailed description. It is intended that all such additional systems, methods, features and advantages be included within this description, be within the scope of the invention, and be protected by the accompanying claims. Additional features of the disclosed embodiments are described in, and will be apparent from, the detailed description that follows.
Detailed Description
The first embodiment.
The invention provides a solar power generation system, which is used as a distributed power system in an island form and is provided for users, namely, the users can be far away from commercial power or can not be networked with the commercial power, and the solar power generation system comprises: at least one solar panel, a battery pack connected to the at least one solar panel, one or more electrical appliances connected between the one or more electrical appliances and the at least one solar panel to receive charging power from the solar panel and to supply power to the one or more electrical appliances, and a controller adapted to implement a Maximum Power Point Tracking (MPPT) algorithm for the at least one solar panel, the MPPT algorithm configured to maximize power output of the at least one solar panel to direct charging of the battery pack from power from the at least one solar panel. For this reason, the MPPT algorithm is already a commonly used algorithm in photovoltaic or wind energy, and the control essence of the algorithm is not described herein again.
And the controller is further adapted to implement control of charging and discharging of the battery pack, so that the battery pack guarantees that the electric quantity of the battery pack is not lower than a preset discharging threshold when supplying power to the one or more electrical appliances, and guarantees that the electric quantity of the battery pack is not higher than a preset charging threshold when the at least one solar panel charges the battery pack. The charging threshold and the discharging threshold are generally set to have a certain margin from the limit threshold, so that the damage of the battery caused by direct overcharge and overdischarge of the battery is avoided. The specific threshold setting can be actually adjusted by reference to the technical manual of the battery provider. The control of the battery pack discharge further includes the controller deriving an upper and lower limit power indicator from the at least one upper and lower limit sensor and allowing the battery pack to charge below or temporarily below the discharge threshold when discharged if the upper and lower limit power indicator indicates that there is sufficient power from or to be from the at least one solar panel to recharge the battery pack, and allowing the battery pack to charge above or temporarily above the charge threshold when charged if the upper and lower limit power indicator indicates that there is sufficient power demand from or to be from the at least one appliance. In addition, the upper and lower limit sensors are intelligent sensors connected to the network to connect the control chip of the electric appliance and the weather providing server, so that the operation plan and the operation state of the electric appliance are acquired through the network, and weather information is acquired. In addition, the information of the upper and lower limit power indicators at least includes the positive and negative values of the following power, that is, at least includes the state that the electric quantity of the battery is increased or decreased in the following time period, in other words, the upper and lower limit power indicators are used for indicating that the battery is in a charging or discharging state in the following time period. It can be understood that although the battery power has reached a threshold, for example, a charging threshold, the upper and lower power indicators indicate that the power is negative or briefly positive and then quickly goes to negative, i.e., the battery goes to a discharging state or briefly charges but quickly goes to a discharging state, so that the operating state of the system can be kept unchanged, i.e., the charging of the battery is not stopped, and the utilization efficiency of solar energy can be improved.
The upper and lower limit sensors are used for collecting timing information of the at least one electric appliance and collecting the information of the residual sunshine duration on the day. For example: the upper and lower limit sensors collect timing information of the at least one electrical appliance and information of the remaining sunshine duration of the day so as to obtain electric power required before the sunshine of the second day and solar electric power which can be generated by the remaining sunshine duration of the day, and generate the upper and lower limit power indicators.
Example two.
The present embodiment provides a solar power generation system which can be provided to users as an island distributed power system, that is, users may need to use distributed power to supply power to various appliances under the condition that the users cannot contact with a municipal power grid, the system comprises: at least one solar panel, a battery pack connected to the at least one solar panel, one or more electrical appliances connected between the one or more electrical appliances and the at least one solar panel to receive charging power from the solar panel and to supply power to the one or more electrical appliances, and a controller adapted to implement a Maximum Power Point Tracking (MPPT) algorithm for the at least one solar panel, the MPPT algorithm configured to maximize power output of the at least one solar panel to direct charging of the battery pack from power from the at least one solar panel. In the light of this, it is preferable that,
the MPPT algorithm is already a common algorithm in photovoltaic or wind energy, and the control essence of the algorithm is not described herein again.
And the controller is further adapted to implement control of charging and discharging of the battery pack, so that the battery pack guarantees that the electric quantity of the battery pack is not lower than a preset discharging threshold of 30% when the battery pack supplies power to the one or more electrical appliances, and the at least one solar panel guarantees that the electric quantity of the battery pack is not higher than a preset charging threshold of 80% when the battery pack is charged. The charging threshold and the discharging threshold are generally set to have a certain margin from the limit threshold, so that the damage of the battery caused by direct overcharge and overdischarge of the battery is avoided.
The control of the battery pack discharge further includes the controller deriving an upper and lower limit power indicator from the at least one upper and lower limit sensor and allowing the battery pack to charge below or temporarily below the discharge threshold when discharged if the upper and lower limit power indicator indicates that there is sufficient power from or to be from the at least one solar panel to recharge the battery pack, and allowing the battery pack to charge above or temporarily above the charge threshold when charged if the upper and lower limit power indicator indicates that there is sufficient power demand from or to be from the at least one appliance.
The upper and lower limit sensors are used for collecting timing information of the at least one electric appliance and collecting the information of the residual sunshine duration on the day. For example: the upper and lower limit sensors collect timing information of the at least one electrical appliance and information of the remaining sunshine duration of the day so as to obtain electric power required before the sunshine of the second day and solar electric power which can be generated by the remaining sunshine duration of the day, and generate the upper and lower limit power indicators. The controller then controls the power control system according to the upper and lower power indicators, which may be specific power values, i.e. calculating the power of the electricity that can be generated by the remaining insolation, and calculating the power demand in the plan, to obtain the electricity to be consumed or stored over a period of time.
Example three.
Example two.
The present embodiment provides a solar power generation system which can be provided to users as an island distributed power system, that is, users may need to use distributed power to supply power to various appliances under the condition that the users cannot contact with a municipal power grid, the system comprises: at least one solar panel, a battery pack connected to the at least one solar panel, one or more electrical appliances connected between the one or more electrical appliances and the at least one solar panel to receive charging power from the solar panel and to supply power to the one or more electrical appliances, and a controller adapted to implement a Maximum Power Point Tracking (MPPT) algorithm for the at least one solar panel, the MPPT algorithm configured to maximize power output of the at least one solar panel to direct charging of the battery pack from power from the at least one solar panel. In the light of this, it is preferable that,
the MPPT algorithm is already a common algorithm in photovoltaic or wind energy, and the control essence of the algorithm is not described herein again.
And the controller is further adapted to implement control of charging and discharging of the battery pack, so that the battery pack guarantees that the electric quantity of the battery pack is not lower than a preset discharging threshold of 30% when the battery pack supplies power to the one or more electrical appliances, and the at least one solar panel guarantees that the electric quantity of the battery pack is not higher than a preset charging threshold of 80% when the battery pack is charged. The charging threshold and the discharging threshold are generally set to have a certain margin from the limit threshold, so that the damage of the battery caused by direct overcharge and overdischarge of the battery is avoided.
The control of the battery pack discharge further includes the controller deriving an upper and lower limit power indicator from the at least one upper and lower limit sensor and allowing the battery pack to charge below or temporarily below the discharge threshold when discharged if the upper and lower limit power indicator indicates that there is sufficient power from or to be from the at least one solar panel to recharge the battery pack, and allowing the battery pack to charge above or temporarily above the charge threshold when charged if the upper and lower limit power indicator indicates that there is sufficient power demand from or to be from the at least one appliance.
The upper and lower limit sensors are used for collecting timing information of the at least one electric appliance and collecting the information of the residual sunshine duration on the day. For example: the upper and lower limit sensors collect timing information of the at least one electrical appliance and information of the remaining sunshine duration of the day so as to obtain electric power required in a period of time before the next day of sunshine and solar electric power which can be generated in a period of time in the remaining sunshine duration of the day, and generate the upper and lower limit power indicators. In this way, it is possible to calculate how much charging or discharging power the battery will be charged or discharged next is obtained around the time when the upper charging limit or the lower discharging limit occurs. The controller then controls the power control system according to the upper and lower power limit indicators, which may be specific power values, i.e. calculating the power value of the electricity that can be generated in the last period of time when the generated power is close to the upper and lower limits of charging and discharging, and calculating the power demand in the plan, and calculating the two to obtain the electricity to be consumed or stored in a period of time.
Although the invention has been described above with reference to various embodiments, it should be understood that many changes and modifications may be made without departing from the scope of the invention. It is therefore intended that the foregoing detailed description be regarded as illustrative rather than limiting, and that it be understood that it is the following claims, including all equivalents, that are intended to define the spirit and scope of this invention. The above examples are to be construed as merely illustrative and not limitative of the remainder of the disclosure. After reading the description of the invention, the skilled person can make various changes or modifications to the invention, and these equivalent changes and modifications also fall into the scope of the invention defined by the claims.
Claims (1)
1. A solar power generation system, said solar power generation system being provided for use by a customer as a distributed power system in the form of an island, said system comprising: at least one solar panel, a battery pack, one or more electrical appliances, at least one ceiling sensor, and a controller connected to the at least one solar panel, the battery pack being connected between the one or more electrical appliances and the at least one solar panel to receive charging power from the solar panel and to supply power to the one or more electrical appliances, the controller being adapted to implement a maximum power point tracking algorithm for the at least one solar panel, the maximum power point tracking algorithm being configured to maximize a power output of the at least one solar panel to direct charging of the battery pack by power from the at least one solar panel; the controller is further adapted to control charging and discharging of the battery pack, so that the battery pack guarantees that the electric quantity of the battery pack is not lower than a preset discharging threshold of 30% when the battery pack supplies power to the one or more electric appliances, and the at least one solar panel guarantees that the electric quantity of the battery pack is not higher than a preset charging threshold of 80% when the battery pack is charged;
it is characterized in that the preparation method is characterized in that,
the control of the battery pack discharge further comprises the controller deriving an upper and lower limit power indicator from the at least one upper and lower limit sensor and allowing the battery pack to charge below or temporarily below the discharge threshold when discharged if the upper and lower limit power indicator indicates that there is sufficient power from or to be from the at least one solar panel to recharge the battery pack and to charge above or temporarily above the charge threshold when charged if the upper and lower limit power indicator indicates that there is sufficient power demand from or to be from at least one appliance;
the upper and lower limit sensors are used for acquiring timing information of the at least one electric appliance and acquiring information of the remaining sunshine duration of the day so as to obtain electric power required in a period of time before the next day of sunshine and solar electric power capable of being generated in a period of time in the remaining sunshine duration of the day, and generate the upper and lower limit power indicators;
the controller controls according to the upper and lower limit power indicators, wherein the upper and lower limit power indicators are specific power values, namely, when the generated power is close to the upper and lower limits of charge and discharge, the power value which can be generated in the latest period of time and the power requirement in the calculation plan are calculated, and the calculation of the power value and the power requirement is carried out to obtain the power to be consumed or stored in the period of time.
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| CN201711430319.8A CN108092313B (en) | 2017-12-26 | 2017-12-26 | Solar power generation system |
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| CN201711430319.8A CN108092313B (en) | 2017-12-26 | 2017-12-26 | Solar power generation system |
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| CN108092313B true CN108092313B (en) | 2021-02-02 |
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| US5631535A (en) * | 1995-06-07 | 1997-05-20 | Franklin Electric Co., Inc. | Regulator for charging a rechargeable storage device from a photovoltaic cell |
| JP5173276B2 (en) * | 2007-06-22 | 2013-04-03 | パナソニック株式会社 | Power supply system, power supply control method for power supply system, and power supply control program therefor |
| GB201503332D0 (en) * | 2015-02-27 | 2015-04-15 | Bransfield Garth Simon And Sales Michael J And Azuri Technologies Ltd And Preston Nigel And Barclay | Solar home system |
| CN104795833B (en) * | 2015-05-08 | 2017-07-28 | 武汉大学 | A kind of independent micro-capacitance sensor energy-storage system of accumulator capacity configuration optimizing method |
| CN106451541B (en) * | 2016-10-31 | 2019-01-01 | 中国地质大学（武汉） | A kind of energy control method and control system of isolated island type micro-capacitance sensor |
| CN108092314B (en) * | 2017-12-26 | 2021-04-02 | 李娥 | Distributed power generation system |
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Effective date of registration: 20210113 Address after: 223500 East District of Economic Development Zone, Guannan County, Lianyungang City, Jiangsu Province (West of Taicang Road, north of Minghui Road) Applicant after: GUANNAN HONGYAO ENVIRONMENTAL PROTECTION ENERGY Co.,Ltd. Address before: 410100 Three Service Outsourcing Bases of New Changhai Center, No. 29 Bancang South Road, Changsha Economic and Technological Development Zone, Changsha City, Hunan Province Applicant before: CHANGSHA LONGSHENG GUANGQI NEW MATERIAL TECHNOLOGY Co.,Ltd. |
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