CN112803443A - Power supply system, power supply control method and energy storage air conditioning equipment - Google Patents
Power supply system, power supply control method and energy storage air conditioning equipment Download PDFInfo
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- CN112803443A CN112803443A CN202011640982.2A CN202011640982A CN112803443A CN 112803443 A CN112803443 A CN 112803443A CN 202011640982 A CN202011640982 A CN 202011640982A CN 112803443 A CN112803443 A CN 112803443A
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- 238000004146 energy storage Methods 0.000 title claims abstract description 116
- 238000000034 method Methods 0.000 title claims abstract description 47
- 238000004378 air conditioning Methods 0.000 title claims abstract description 9
- 238000010248 power generation Methods 0.000 claims abstract description 81
- 230000005611 electricity Effects 0.000 claims description 31
- 230000001502 supplementing effect Effects 0.000 claims description 11
- 238000004590 computer program Methods 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 8
- 230000004044 response Effects 0.000 description 4
- 239000013589 supplement Substances 0.000 description 4
- 230000000087 stabilizing effect Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000000739 chaotic effect Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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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
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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
- H02J3/381—Dispersed generators
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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
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
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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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a power supply system, a power supply control method and energy storage air conditioning equipment. Wherein, this system includes: alternating current power supply, current conversion unit, contravariant unit, photovoltaic equipment and energy storage equipment, its characterized in that, power supply system is used for first load, second load and third load power supply, and the contravariant unit is connected to first load, and the second load is connected to between photovoltaic equipment and the energy storage equipment, and alternating current power supply is connected to the third load, and this system still includes: and the first controller is arranged between a connection point of the second load and the energy storage device and the photovoltaic equipment and is used for adjusting the power supply state of the photovoltaic equipment when the power generation amount of the photovoltaic equipment is larger than the sum of the power consumption amounts of the first load, the second load and the third load in the state that the alternating current power supply and the third load are connected. According to the invention, the problem that the alternating current power supply is disordered and even damaged due to reverse charging of the alternating current power supply when the electric quantity provided by the photovoltaic equipment is surplus can be avoided, and the safety is improved.
Description
Technical Field
The invention relates to the technical field of electronic power, in particular to a power supply system, a power supply control method and energy storage air conditioning equipment.
Background
At present, an energy storage air conditioner (such as a photovoltaic air conditioner) is widely popularized and applied as an integrated device for generating and using electricity, fig. 1 is a structural diagram of a power supply system of the existing photovoltaic air conditioner, as shown in fig. 1, the photovoltaic device is directly connected to a direct current bus of a converter unit to directly drive an air conditioner compressor to operate, and when the generated energy of the photovoltaic device is redundant, photovoltaic power generation is inverted into alternating current through a converter unit of an air conditioner frequency converter to feed power to a power grid; when the photovoltaic power generation capacity is insufficient, the insufficient part is provided by commercial power; and moreover, the direct current bus is opened and is directly connected to the energy storage equipment. However, as the application of the photovoltaic air conditioner expands, such as in areas without power grid, such as islands, remote areas, frontier sentries, etc., the ac side needs the generator set to supply power, and the existing power supply system structure has the following problems: the AC side is not supported by a large power grid, and when the electric quantity of the photovoltaic equipment is redundant, if the photovoltaic equipment is reversely charged to the generator set, the control of the generator set is disordered, and even the generator set is damaged when the photovoltaic equipment is serious;
the problem of generating set control confusion can be caused when photovoltaic equipment surplus electric quantity is reversely charged to the generating set in the prior art, and an effective solution is not provided at present.
Disclosure of Invention
The embodiment of the invention provides a power supply system, a power supply control method and energy storage air conditioning equipment, and aims to solve the problem that in the prior art, when redundant electric quantity of photovoltaic equipment is reversely charged to a generator set, the control of the generator set is disordered.
In order to solve the above technical problem, the present invention provides a power supply system, wherein the system includes: the power supply system is used for supplying power to a load combination, the load combination at least comprises a first load, a second load and a third load, the first load is connected with the inversion unit, the second load is connected between the photovoltaic device and the energy storage device, and the third load is connected with the alternating current power supply, and the system further comprises:
and the first controller is arranged between the connecting point of the second load and the energy storage device and the photovoltaic device and used for adjusting the power supply state of the photovoltaic device when the power generation amount of the photovoltaic device is larger than the sum of the power consumption amounts of the first load, the second load and the third load in the state that the alternating current power supply and the third load are connected.
Further, the first controller is specifically configured to:
when the power generation amount of the photovoltaic equipment is larger than the sum of the power consumption amounts of the first load, the second load and the third load and the energy storage equipment is in a non-full power state, controlling the photovoltaic equipment to charge the energy storage equipment;
and the energy storage device is also used for controlling the generated energy of the photovoltaic device to be reduced when the generated energy of the photovoltaic device is larger than the sum of the power consumption of the first load, the second load and the third load and the energy storage device is in a full-power state.
Further, the first controller is also used for stabilizing the voltage of the direct current bus.
Further, the system further comprises:
and the first end of the second controller is connected between the alternating current power supply and the third load, and the second end of the second controller is connected between the first controller and the energy storage device, so that the second controller is used for controlling the alternating current power supply to charge the energy storage device and controlling the photovoltaic device to supply power to the third load.
The invention also provides energy storage air conditioning equipment which comprises a load combination, wherein the load combination at least comprises a first load, a second load and a third load, and the energy storage air conditioning equipment also comprises the power supply system.
The invention also provides a power supply control method, which is applied to the power supply system and comprises the following steps:
under the condition that the alternating current power supply and the third load are connected, judging the magnitude relation between the power generation amount of the photovoltaic equipment and the sum of the power consumption amounts of the first load, the second load and the third load;
and if the power generation amount of the photovoltaic equipment is larger than the sum of the power consumption amounts of the first load, the second load and the third load, adjusting the power supply state of the photovoltaic equipment.
Further, if the power generation amount of the photovoltaic equipment is larger than the sum of the power consumption amounts of the first load, the second load and the third load, adjusting the power supply state of the photovoltaic equipment comprises the following steps:
judging whether the energy storage equipment is in a full-power state or not;
if not, controlling the photovoltaic equipment to charge the energy storage equipment;
and if so, controlling the power generation amount of the photovoltaic equipment to be reduced.
Further, after the photovoltaic device is controlled to charge the energy storage device, the method further includes:
judging whether the electric quantity of the energy storage equipment is lower than a preset value and lasts for a preset time;
and if so, controlling the alternating current power supply to charge the energy storage equipment until the energy storage equipment is in a full-power state.
Further, after the magnitude relation between the power generation amount of the photovoltaic device and the sum of the power consumption amounts of the first load, the second load and the third load is judged, the method further comprises the following steps:
if the power generation amount of the photovoltaic equipment is less than or equal to the sum of the power consumption amounts of the first load, the second load and the third load, judging whether the power generation amount of the photovoltaic equipment is greater than the sum of the power consumption amounts of the first load and the second load;
if so, the photovoltaic equipment is controlled to preferentially supply power to the first load and the second load, the residual power is supplied to the third load, and if the residual power cannot meet the power consumption of the third load, the energy storage equipment and/or the alternating current power supply are controlled to supply power to the third load in a supplementing mode.
Further, after determining whether the power generation amount of the photovoltaic device is greater than the sum of the power consumption amounts of the first load and the second load, the method further includes:
if the power generation amount of the photovoltaic equipment is smaller than or equal to the sum of the power consumption amounts of the first load and the second load, judging whether the power generation amount of the photovoltaic equipment is larger than the power consumption amount of the first load or not;
if so, the photovoltaic equipment is controlled to preferentially supply power to the first load, the residual electric quantity is used for supplying power to the second load, and if the residual electric quantity cannot meet the power consumption of the second load, the energy storage equipment is controlled to supply power to the second load in a supplementing mode.
Further, after determining whether the power generation amount of the photovoltaic device is greater than the power consumption amount of the first load, the method further includes:
if the generated energy of the photovoltaic equipment is smaller than or equal to the electricity consumption of the first load, the photovoltaic equipment is controlled to preferentially supply power to the first load, and if the generated energy of the photovoltaic equipment cannot meet the electricity consumption of the first load, the energy storage equipment and/or the alternating current power supply are controlled to supply power to the first load in a supplementing mode.
Further, the method further comprises:
judging whether the power generation amount of the photovoltaic equipment is larger than the sum of the power consumption amounts of the first load and the second load or not in the state that an alternating current power supply and a third load are not connected;
if the power generation amount of the photovoltaic equipment is larger than the sum of the power consumption amounts of the first load and the second load, judging whether the energy storage equipment is in a full power state;
if so, controlling the photovoltaic equipment to preferentially supply power to the first load and the second load, and charging the energy storage equipment by using the residual electric quantity;
and if not, controlling the power generation amount of the photovoltaic equipment to be reduced.
Further, after determining whether the power generation amount of the photovoltaic device is greater than the sum of the power consumption amounts of the first load and the second load, the method further includes:
if the power generation amount of the photovoltaic equipment is smaller than or equal to the sum of the power consumption amounts of the first load and the second load, judging whether the power generation amount of the photovoltaic equipment is larger than the power consumption amount of the first load or not;
if so, the photovoltaic equipment is controlled to preferentially supply power to the first load, the residual electric quantity is used for supplying power to the second load, and if the residual electric quantity cannot meet the power consumption of the second load, the energy storage equipment is controlled to supply power to the second load in a supplementing mode.
Further, after determining whether the power generation amount of the photovoltaic device is greater than the power consumption amount of the first load, the method further includes:
and if the generated energy of the photovoltaic equipment is less than or equal to the electricity consumption of the first load, controlling the photovoltaic equipment to supply power to the first load, and if the generated energy of the photovoltaic equipment cannot meet the electricity consumption of the first load, controlling the energy storage equipment to supply power to the first load in a supplementing manner.
The present invention also provides a computer-readable storage medium having stored thereon a computer program characterized in that the program realizes the above power supply control method when executed by a processor.
By applying the technical scheme of the invention, the first controller is arranged between the photovoltaic equipment and the connecting point of the second load and the energy storage equipment and is used for adjusting the power supply state of the photovoltaic equipment when the power generation amount of the photovoltaic equipment is greater than the sum of the power consumption amounts of the first load, the second load and the third load under the condition that the alternating current power supply and the third load are connected. The problem that alternating current power supply control is disordered and even damaged due to the fact that the alternating current power supply is reversely charged when the electric quantity provided by the photovoltaic equipment is surplus can be avoided, and safety is improved.
Drawings
Fig. 1 is a structural diagram of a power supply system of a conventional photovoltaic air conditioner;
FIG. 2 is a block diagram of a power supply system according to an embodiment of the invention;
FIG. 3 is a block diagram of a power supply system according to another embodiment of the present invention;
FIG. 4 is a flow chart of a power supply control method according to an embodiment of the invention;
fig. 5 is an equivalent configuration diagram of a power supply system according to another embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, and "a plurality" typically includes at least two.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
It should be understood that although the terms first, second, etc. may be used to describe controllers in embodiments of the present invention, these controllers should not be limited to these terms. These terms are only used to distinguish between controllers disposed in different locations. For example, a first controller may also be referred to as a second controller, and similarly, a second controller may also be referred to as a first controller, without departing from the scope of embodiments of the present invention.
The words "if", as used herein, may be interpreted as "at … …" or "at … …" or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrases "if determined" or "if detected (a stated condition or event)" may be interpreted as "when determined" or "in response to a determination" or "when detected (a stated condition or event)" or "in response to a detection (a stated condition or event)", depending on the context.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in the article or device in which the element is included.
Alternative embodiments of the present invention are described in detail below with reference to the accompanying drawings.
Example 1
The present embodiment provides a power supply system, and fig. 2 is a structural diagram of the power supply system according to the embodiment of the present invention, as shown in fig. 2, including: the device comprises an alternating current power supply 1, a current conversion unit 2, an inversion unit 3, photovoltaic equipment 4 and energy storage equipment 5. Alternating current power supply 1 provides the alternating current, converts into the direct current through change of current unit 2, converts into the alternating current through inversion unit 3 and supplies with first load 6, connects through direct current bus between change of current unit 2 and the inversion unit 3, and photovoltaic equipment 4 inserts direct current bus, and energy storage equipment 5 also inserts direct current bus, and simultaneously, photovoltaic equipment 4 connects energy storage equipment 5.
The power supply system is used for supplying power to a load combination, the load combination comprises a first load 6, a second load 7 and a third load 8, wherein the first load 6 is connected with the inverter unit 3, the second load 7 is connected between the photovoltaic device 4 and the energy storage device 5, and the third load 8 is connected with the alternating current power supply 1, and the system further comprises:
and the first controller 9 is arranged between the connection point of the second load 7 and the energy storage device 5 and the photovoltaic device 4 and is used for adjusting the power supply state of the photovoltaic device when the power generation amount of the photovoltaic device is larger than the sum of the power consumption amounts of the first load 6, the second load 7 and the third load 8 under the condition that the alternating current power supply 1 and the third load 8 are connected.
In the present embodiment, the first load 6 is an ac load, such as an air conditioner compressor, the second load 7 is a dc load, the third load 8 is an ac load, and the ac power supply is a generator set.
In the power supply system of this embodiment, a first controller is arranged between the photovoltaic device and a connection point of the second load and the energy storage device, and is used for adjusting the power supply state of the photovoltaic device when the power generation amount of the photovoltaic device is greater than the sum of the power consumptions of the first load, the second load and the third load in a state where the ac power supply and the third load are connected. The problem that alternating current power supply control is disordered and even damaged due to the fact that the alternating current power supply is reversely charged when the electric quantity provided by the photovoltaic equipment is surplus can be avoided, and safety is improved.
Example 2
In this embodiment, another power supply system is provided, and in a specific implementation, if the power generation amount of the photovoltaic device is large, the excess power may be prevented from being reversely charged to the ac power supply by charging the energy storage device or reducing the power generation amount, which specific manner is adopted may be determined according to the power generation amount of the photovoltaic device and the power condition of the energy storage device, based on which, this embodiment provides a preferred implementation manner, that is, the first controller is specifically configured to: when the power supply amount of the photovoltaic equipment 4 is larger than the sum of the power consumption amounts of the first load 6, the second load 7 and the third load 8, and the energy storage equipment 5 is in a non-full power state, controlling the photovoltaic equipment 4 to charge the energy storage equipment 5; and the control module is also used for controlling the power generation amount of the photovoltaic equipment 4 to be reduced when the power supply amount of the photovoltaic equipment 4 is larger than the sum of the power consumption amounts of the first load 6, the second load 7 and the third load 8 and the energy storage equipment 5 is in a full power state.
As shown in fig. 1 mentioned above, in the conventional power supply system, the dc bus between the converter unit and the inverter unit is started by the converter unit to stabilize the voltage, and when the ac power supply is not turned on, the first load cannot normally operate.
Fig. 3 is a structural diagram of a power supply system according to another embodiment of the present invention, since the photovoltaic device 4 provides direct current and the third load needs to input alternating current, as shown in fig. 3, the power supply system further includes: and a second controller 10, a first end of which is connected between the ac power source 1 and the third load 8, and a second end of which is connected between the first controller 9 and the energy storage device 5, for controlling the ac power source 1 to charge the energy storage device 5 and controlling the photovoltaic device 4 to supply power to the third load 8. The second controller 10 has a dual function of converting direct current power into alternating current power and alternating current power into direct current power.
Example 3
The present embodiment provides a power supply control method, and fig. 4 is a flowchart of the power supply control method according to the embodiment of the present invention, as shown in fig. 4, the method includes:
and S101, judging the magnitude relation between the power generation amount of the photovoltaic equipment and the sum of the power consumption amounts of the first load, the second load and the third load in the state that the alternating current power supply and the third load are connected.
In this embodiment, the first load is connected to the inverter unit, the second load is connected between the photovoltaic device and the energy storage device, and the third load is connected to the ac power supply, where the first load is an ac load, such as an air conditioner compressor, the second load is a dc load, and the third load is an ac load.
And S102, if the power generation amount of the photovoltaic equipment is larger than the sum of the power consumption amounts of the first load, the second load and the third load, adjusting the power supply state of the photovoltaic equipment.
During specific implementation, the first controller arranged between the second load and the energy storage device and the photovoltaic device adjusts the power supply state of the photovoltaic device.
According to the power supply control method, under the condition that the alternating current power supply and the third load are connected, by judging the magnitude relation between the power generation amount of the photovoltaic equipment and the sum of the power consumption of the first load, the second load and the third load, if the power generation amount of the photovoltaic equipment is larger than the sum of the power consumption of the first load, the second load and the third load, the power supply state of the photovoltaic equipment is adjusted, the problem that the alternating current power supply is disordered and even damaged due to reverse charging to the alternating current power supply when the power provided by the photovoltaic equipment is surplus can be avoided, and the safety is improved.
Example 4
In this embodiment, another power supply control method is provided, if the power generation amount of the photovoltaic device is relatively large, the energy storage device may be charged or the power generation amount may be reduced to avoid that the surplus power is reversely charged to the ac power supply, and in order to determine which manner is specifically adopted according to the power generation amount of the photovoltaic device and the power condition of the energy storage device, the step S102 specifically includes: judging whether the energy storage equipment is in a full-power state or not; if not, controlling the photovoltaic equipment to charge the energy storage equipment; and if so, controlling the power generation amount of the photovoltaic equipment to be reduced.
In some cases, the photovoltaic device charges the energy storage device at a slow speed, which may cause the energy storage device to be in an unfilled state for a long time, and therefore, after the photovoltaic device is controlled to charge the energy storage device, the method further includes: judging whether the electric quantity of the energy storage equipment is lower than a preset value and lasts for a preset time; and if so, controlling the alternating current power supply to charge the energy storage equipment until the energy storage equipment is in a full-power state. And if not, controlling the photovoltaic equipment to continuously charge the energy storage equipment.
The above steps are directed to the case when the power generation amount of the photovoltaic device is greater than the sum of the power consumptions of the first load, the second load and the third load, in practical application, the power generation amount of the photovoltaic device is not necessarily greater than the sum of the power consumptions of the first load, the second load and the third load, and therefore, after determining the magnitude relationship between the power generation amount of the photovoltaic device and the sum of the power consumptions of the first load, the second load and the third load, the method further comprises: if the power generation amount of the photovoltaic equipment is less than or equal to the sum of the power consumption amounts of the first load, the second load and the third load, judging whether the power generation amount of the photovoltaic equipment is greater than the sum of the power consumption amounts of the first load and the second load; if yes, the photovoltaic equipment is controlled to preferentially supply power to the first load and the second load, the residual power is supplied to the third load, if the residual power cannot meet the power consumption of the third load, the energy storage equipment is preferentially controlled to supplement the power to the third load, and if the power is still insufficient, the alternating current power supply is continuously controlled to supplement the power to the third load.
In practical applications, the power generation amount of the photovoltaic device is not necessarily greater than the sum of the power consumptions of the first load and the second load, and therefore, after determining whether the power generation amount of the photovoltaic device is greater than the sum of the power consumptions of the first load and the second load, the method further includes:
if the power generation amount of the photovoltaic equipment is less than or equal to the sum of the power consumption of the first load and the second load, judging whether the power generation amount of the photovoltaic equipment is greater than the power consumption of the first load or not; if yes, the photovoltaic equipment is controlled to preferentially supply power to the first load, the residual power is controlled to supply power to the second load, and if the residual power cannot meet the power consumption of the second load, the energy storage equipment is controlled to supplement the power supply to the second load.
In practical application, after the power generation amount of the photovoltaic equipment is also not necessarily greater than the sum of the power consumption of the first load and whether the power generation amount of the photovoltaic equipment is greater than the power consumption of the first load is judged, the method further includes: and if the generated energy of the photovoltaic equipment is less than or equal to the power consumption of the first load, the photovoltaic equipment is controlled to preferentially supply power to the first load, and if the generated energy of the photovoltaic equipment cannot meet the power consumption of the first load, the energy storage equipment and/or the alternating current power supply are controlled to supply power to the first load additionally.
The above steps are all directed to the case where the ac power supply and the third load are turned on, and in practical applications, there is also a case where the ac power supply and the third load are not turned on due to a fault or other reasons, and therefore, the method further includes: under the condition that the alternating current power supply and the third load are not connected, power is supplied only through the photovoltaic equipment and the energy storage equipment, the running load only comprises a first load and a second load, and whether the power generation amount of the photovoltaic equipment is larger than the sum of the power consumption amounts of the first load and the second load is judged; if the power generation amount of the photovoltaic equipment is larger than the sum of the power consumption amounts of the first load and the second load, judging whether the energy storage equipment is in a full power state; if so, controlling the photovoltaic equipment to preferentially supply power to the first load and the second load, and charging the energy storage equipment by using the residual electric quantity; and if not, controlling the power generation amount of the photovoltaic equipment to be reduced.
In practical applications, the power generation amount of the photovoltaic device is not necessarily greater than the sum of the power consumptions of the first load and the second load, and therefore, after determining whether the power generation amount of the photovoltaic device is greater than the sum of the power consumptions of the first load and the second load, the method further includes: if the power generation amount of the photovoltaic equipment is less than or equal to the sum of the power consumption amounts of the first load and the second load, judging whether the power generation amount of the photovoltaic equipment is greater than the power consumption amount of the first load or not; if so, controlling the photovoltaic equipment to preferentially supply power to the first load, controlling the residual electric quantity to supply power to the second load, and if the residual electric quantity cannot meet the power consumption of the second load, controlling the energy storage equipment to supplement power for the second load.
In practical applications, the power generation amount of the photovoltaic device is not necessarily greater than the sum of the power consumption of the first load, and therefore, after determining whether the power generation amount of the photovoltaic device is greater than the power consumption of the first load, the method further includes: and if the generated energy of the photovoltaic equipment is less than or equal to the electricity consumption of the first load, the photovoltaic equipment is controlled to supply power to the first load, and if the generated energy of the photovoltaic equipment cannot meet the electricity consumption of the first load, the energy storage equipment is controlled to supply power to the first load in a supplementing manner.
Example 5
The present embodiment provides another power supply system, as shown in fig. 3 mentioned above, which includes a first load 6, and in the present embodiment, the first load 6 is an air conditioner compressor, an alternating current power supply 1 (generator set), a photovoltaic device 4, and an energy storage device 5.
A first controller 9 is arranged on the direct current side and used for controlling the photovoltaic equipment 4 to charge the energy storage equipment, stabilizing a direct current bus of the photovoltaic air conditioner and directly supplying power to a second load 7 (direct current load) on the direct current side through the photovoltaic equipment 4; in addition, a second controller 10 is arranged on the alternating current side, when the power generation amount of the photovoltaic device 4 is insufficient, the energy storage device 5 is charged by the alternating current power supply 1 through the second controller 10, and meanwhile, the alternating current power supply 1 supplies power to the first load 6 (air conditioner compressor) through the current conversion unit 2 and the inverter unit 3. The system also comprises a third load 8 which is an alternating current load and is directly powered by the alternating current power supply 1, or is powered by the energy storage device 5 or the photovoltaic device 4 through a second controller 10. The structure can realize pure direct current operation of the first load 6 and realize direct and positive off-line operation.
The present embodiment further provides another power supply control method, including:
s1, judging the magnitude relation between the power generation amount of the photovoltaic equipment and the sum of the power consumption amounts of the first load (air conditioner compressor), the second load and the third load;
s2, if the generated energy of the photovoltaic equipment is larger than the sum of the power consumption of the first load (air conditioner compressor), the second load and the third load, controlling the photovoltaic equipment to supply power to the first load and the second load, simultaneously controlling the photovoltaic equipment to supply power to the alternating current load through the second electric controller, using the residual power to charge the energy storage equipment, if the electric quantity of the energy storage equipment is in a full power state and does not need to be charged, controlling the generated energy of the photovoltaic equipment to be reduced through the first controller, and at the moment, enabling the motor unit to be in a standby state.
In step S2, the photovoltaic device charges the energy storage device through the first controller, and when the photovoltaic device charges slowly, the energy storage device may also be charged by the ac power source through the second controller. Specifically, the energy storage device is preferentially charged by the remaining electric quantity of the photovoltaic device, when the electric quantity of the energy storage device is lower than 20% for three consecutive days, the photovoltaic device does not generate electricity at night by the alternating current power supply, the energy storage device is charged when the electricity price is at the valley time electricity price, and the charging is stopped when the electric quantity of the energy storage device is 100%.
And S3, if the sum of the electricity consumption of the first load and the second load is less than the electricity generation amount of the photovoltaic equipment and less than or equal to the sum of the electricity consumption of the first load, the second load and the third load, controlling the photovoltaic equipment to preferentially supply power to the first load and the second load, supplying power to the third load through the second controller by the residual electricity, and if the residual electricity does not meet the electricity consumption amount of the third load, supplying the insufficient part by the energy storage equipment through the second controller. If the electric quantity of the energy storage equipment is insufficient, the alternating current power supply provides the residual electric quantity.
And S4, if the electricity consumption of the first load is less than the electricity generation amount of the photovoltaic equipment and less than or equal to the sum of the electricity consumption of the first load and the electricity consumption of the second load, controlling the photovoltaic equipment to preferentially supply power to the first load, and supplying residual electricity to the second load, if the residual electricity does not meet the electricity consumption amount of the second load, the insufficient part is supplied by the energy storage equipment, and if the electricity consumption of the energy storage equipment is insufficient, the part is supplied by the alternating current power supply through the second controller.
And S5, if the generated energy of the photovoltaic equipment is less than or equal to the electricity consumption of the first load, controlling the photovoltaic equipment to preferentially supply power to the first load, if the generated energy of the photovoltaic equipment does not meet the electricity consumption requirement of the first load, the insufficient part is supplied to the first load by the energy storage equipment through the direct current bus and the inversion unit, and if the electric quantity of the energy storage equipment is insufficient, the insufficient part is supplied by the alternating current power supply through the current conversion unit and the inversion power supply.
According to the power supply control method, when the power generation amount of the photovoltaic equipment is high, the first controller controls the power generation amount of the photovoltaic equipment, and the situation that the power is reversely supplied to the alternating current power supply through the current conversion unit of the first load, so that the internal control of the alternating current power supply is disordered is avoided. Meanwhile, the load in the system is increased or the irradiation amount is poor, and when more photovoltaic equipment needs to be installed, the rated capacity of the first load does not need to be considered, and the capacity of the first controller only needs to be increased.
The above steps are directed to a case where the ac power source and the third load are connected, in practical applications, there is also a case where the ac power source and the third load are not connected, fig. 5 is an equivalent structure diagram of a power supply system according to another embodiment of the present invention, as shown in fig. 5, power is supplied only through the photovoltaic device and the energy storage device, and the loads that operate only include the first load and the second load. The first controller is used for controlling the photovoltaic equipment to charge the energy storage equipment and stabilizing the voltage of the direct current bus, and supplying power to the second load, the power supply system preferentially adopts the photovoltaic equipment to supply power to the first load and the second load, and when the power generation amount of the photovoltaic equipment is insufficient, the energy storage equipment provides residual electric quantity; when the power generation amount of the photovoltaic equipment is surplus, the first load and the second load are preferentially supplied with power, the surplus power is used for charging the energy storage equipment, and if the energy storage equipment is in a full power state and does not need to be charged, the first controller controls the reduction of the power generation amount of the photovoltaic equipment.
Through the scheme, the capacity of the energy storage equipment can be configured according to the electricity consumption of the first load and the second load so as to achieve the expected operation duration.
Example 6
The embodiment provides an energy storage air conditioning equipment, including the load combination, wherein include first load, second load and third load, still include above-mentioned power supply system for the realization is avoided when the electric quantity that photovoltaic equipment provided has the surplus, and reverse charging gives alternating current power supply, leads to the chaotic problem of damaging even of alternating current power supply control, improves the security.
Example 7
The present embodiment provides a computer-readable storage medium on which a computer program is stored, which when executed by a processor implements the power supply control method in the above-described embodiments.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (15)
1. A power supply system comprising: alternating current power supply, a commutation unit, an inversion unit, photovoltaic equipment and energy storage equipment, characterized in that, the power supply system is used for supplying power for load combination, the load combination includes at least first load, second load and third load, the first load is connected with the inversion unit, the second load is connected to between photovoltaic equipment and the energy storage equipment, the third load is connected with alternating current power supply, the system still includes:
and the first controller is arranged between the connecting point of the second load and the energy storage device and the photovoltaic device and used for adjusting the power supply state of the photovoltaic device when the power generation amount of the photovoltaic device is larger than the sum of the power consumption amounts of the first load, the second load and the third load in the state that the alternating current power supply and the third load are connected.
2. The system of claim 1, wherein the first controller is specifically configured to:
when the power generation amount of the photovoltaic equipment is larger than the sum of the power consumption amounts of the first load, the second load and the third load and the energy storage equipment is in a non-full power state, controlling the photovoltaic equipment to charge the energy storage equipment;
and the energy storage device is also used for controlling the generated energy of the photovoltaic device to be reduced when the generated energy of the photovoltaic device is larger than the sum of the power consumption of the first load, the second load and the third load and the energy storage device is in a full-power state.
3. The system of claim 1, wherein the first controller is further configured to stabilize the voltage of the dc bus.
4. The system of claim 1, further comprising:
and the first end of the second controller is connected between the alternating current power supply and the third load, and the second end of the second controller is connected between the first controller and the energy storage device, so that the second controller is used for controlling the alternating current power supply to charge the energy storage device and controlling the photovoltaic device to supply power to the third load.
5. An energy storage air conditioning apparatus comprising a load combination comprising at least a first load, a second load and a third load, characterized in that it further comprises a power supply system according to any one of claims 1 to 4.
6. A power supply control method applied to the power supply system according to any one of claims 1 to 4, characterized by comprising:
under the condition that the alternating current power supply and the third load are connected, judging the magnitude relation between the power generation amount of the photovoltaic equipment and the sum of the power consumption amounts of the first load, the second load and the third load;
and if the power generation amount of the photovoltaic equipment is larger than the sum of the power consumption amounts of the first load, the second load and the third load, adjusting the power supply state of the photovoltaic equipment.
7. The method of claim 6, wherein adjusting the power state of the photovoltaic device if the power generation amount of the photovoltaic device is greater than the sum of the power usage amounts of the first load, the second load, and the third load comprises:
judging whether the energy storage equipment is in a full-power state or not;
if not, controlling the photovoltaic equipment to charge the energy storage equipment;
and if so, controlling the power generation amount of the photovoltaic equipment to be reduced.
8. The method of claim 7, wherein after controlling the photovoltaic device to charge the energy storage device, the method further comprises:
judging whether the electric quantity of the energy storage equipment is lower than a preset value and lasts for a preset time;
and if so, controlling the alternating current power supply to charge the energy storage equipment until the energy storage equipment is in a full-power state.
9. The method according to claim 6, wherein after determining the magnitude relationship between the amount of power generated by the photovoltaic device and the sum of the amounts of power used by the first load, the second load, and the third load, the method further comprises:
if the power generation amount of the photovoltaic equipment is less than or equal to the sum of the power consumption amounts of the first load, the second load and the third load, judging whether the power generation amount of the photovoltaic equipment is greater than the sum of the power consumption amounts of the first load and the second load;
if so, the photovoltaic equipment is controlled to preferentially supply power to the first load and the second load, the residual power is supplied to the third load, and if the residual power cannot meet the power consumption of the third load, the energy storage equipment and/or the alternating current power supply are controlled to supply power to the third load in a supplementing mode.
10. The method of claim 9, wherein after determining whether the power generation of the photovoltaic device is greater than the sum of the power usage of the first load and the second load, the method further comprises:
if the power generation amount of the photovoltaic equipment is smaller than or equal to the sum of the power consumption amounts of the first load and the second load, judging whether the power generation amount of the photovoltaic equipment is larger than the power consumption amount of the first load or not;
if so, the photovoltaic equipment is controlled to preferentially supply power to the first load, the residual electric quantity is used for supplying power to the second load, and if the residual electric quantity cannot meet the power consumption of the second load, the energy storage equipment is controlled to supply power to the second load in a supplementing mode.
11. The method of claim 10, wherein after determining whether the amount of power generated by the photovoltaic device is greater than the amount of power used by the first load, the method further comprises:
if the generated energy of the photovoltaic equipment is smaller than or equal to the electricity consumption of the first load, the photovoltaic equipment is controlled to preferentially supply power to the first load, and if the generated energy of the photovoltaic equipment cannot meet the electricity consumption of the first load, the energy storage equipment and/or the alternating current power supply are controlled to supply power to the first load in a supplementing mode.
12. The method of claim 6, further comprising:
judging whether the power generation amount of the photovoltaic equipment is larger than the sum of the power consumption amounts of the first load and the second load or not in the state that an alternating current power supply and a third load are not connected;
if the power generation amount of the photovoltaic equipment is larger than the sum of the power consumption amounts of the first load and the second load, judging whether the energy storage equipment is in a full power state;
if so, controlling the photovoltaic equipment to preferentially supply power to the first load and the second load, and charging the energy storage equipment by using the residual electric quantity;
and if not, controlling the power generation amount of the photovoltaic equipment to be reduced.
13. The method of claim 12, wherein after determining whether the amount of power generated by the photovoltaic device is greater than the sum of the power usage of the first load and the second load, the method further comprises:
if the power generation amount of the photovoltaic equipment is smaller than or equal to the sum of the power consumption amounts of the first load and the second load, judging whether the power generation amount of the photovoltaic equipment is larger than the power consumption amount of the first load or not;
if so, the photovoltaic equipment is controlled to preferentially supply power to the first load, the residual electric quantity is used for supplying power to the second load, and if the residual electric quantity cannot meet the power consumption of the second load, the energy storage equipment is controlled to supply power to the second load in a supplementing mode.
14. The method of claim 13, wherein after determining whether the amount of power generated by the photovoltaic device is greater than the amount of power used by the first load, the method further comprises:
and if the generated energy of the photovoltaic equipment is less than or equal to the electricity consumption of the first load, controlling the photovoltaic equipment to supply power to the first load, and if the generated energy of the photovoltaic equipment cannot meet the electricity consumption of the first load, controlling the energy storage equipment to supply power to the first load in a supplementing manner.
15. A computer-readable storage medium, on which a computer program is stored, which program, when being executed by a processor, carries out the method according to any one of claims 6 to 14.
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Application publication date: 20210514 |