CN111864725A - Wind-solar-storage integrated air conditioning system based on common direct current bus and control method thereof - Google Patents
Wind-solar-storage integrated air conditioning system based on common direct current bus and control method thereof Download PDFInfo
- Publication number
- CN111864725A CN111864725A CN202010821118.6A CN202010821118A CN111864725A CN 111864725 A CN111864725 A CN 111864725A CN 202010821118 A CN202010821118 A CN 202010821118A CN 111864725 A CN111864725 A CN 111864725A
- Authority
- CN
- China
- Prior art keywords
- direct current
- current bus
- air conditioning
- bus
- conditioning system
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/10—Parallel operation of dc sources
- H02J1/109—Scheduling or re-scheduling the operation of the DC sources in a particular order, e.g. connecting or disconnecting the sources in sequential, alternating or in subsets, to meet a given demand
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/49—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring ensuring correct operation, e.g. by trial operation or configuration checks
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/88—Electrical aspects, e.g. circuits
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
-
- 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
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/10—Parallel operation of dc sources
- H02J1/12—Parallel operation of dc generators with converters, e.g. with mercury-arc rectifier
-
- 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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
-
- 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
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/061—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for DC powered loads
-
- 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
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/08—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems requiring starting of a prime-mover
-
- 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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B10/00—Integration of renewable energy sources in buildings
- Y02B10/70—Hybrid systems, e.g. uninterruptible or back-up power supplies integrating renewable energies
-
- 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
Abstract
The invention provides a wind-solar-storage integrated air conditioning system based on a common direct-current bus and a control method thereof, belonging to the field of air conditioning systems. The system comprises a direct current bus, an alternating current power grid, a solar photovoltaic cell panel and a wind driven generator which are electrically connected with the direct current bus and used for providing electric energy for the direct current bus, an air conditioning system which is electrically connected with the direct current bus, and a DC control selector which is used for collecting the electric information of the direct current bus, the alternating current power grid, the solar photovoltaic cell panel and the wind driven generator and configuring the alternating current power grid, the solar photovoltaic cell panel and the wind driven generator according to the electric information so as to realize that the voltage provided by the direct current bus is in the voltage range required by the air conditioning system. The invention comprehensively utilizes light energy and wind energy, reduces the dependence of an air conditioning system on an alternating current power grid, and improves the stability of the system operation.
Description
Technical Field
The invention relates to the field of air conditioning systems, in particular to a wind-solar-storage integrated air conditioning system based on a common direct-current bus and a control method thereof.
Background
The light storage air conditioning system is an air conditioning application system for collecting and absorbing new energy on site, is widely applied, and is more energy-saving and environment-friendly compared with an air conditioning system powered by commercial power. There are some disadvantages that result in limited use of the air conditioning system.
For example, when the light storage air conditioning system is applied to the conditions of evening and morning, the light storage air conditioning system has the following characteristics: the photovoltaic power generation system is in a stop state when the sunlight is insufficient in the evening and the morning. At this time, the air conditioning system is in a cooling peak period, and the energy storage system is generally in a charging state during the morning and evening because the electricity charges are relatively cheap. The electric energy required by system refrigeration and energy storage needs to be taken from a power grid, and the electric energy consumption is quite large.
For example, when the air conditioning system needs ac off-grid operation, for example, when an ac grid fault or a converter connected to the ac grid fails, for example, when an overvoltage fault occurs in the dc bus voltage, the entire air conditioning system loses the control of the dc bus and cannot operate normally.
Therefore, how to design a technical scheme capable of ensuring the stable operation of the air conditioning system under the condition of energy conservation and environmental protection is an urgent technical problem to be solved in the industry.
Disclosure of Invention
The invention provides a wind-solar-storage integrated air conditioning system based on a common direct-current bus and a control method thereof, aiming at solving the technical problem that the energy-saving and environment-friendly light-storage air conditioning system in the prior art cannot normally operate.
The technical scheme adopted by the invention is as follows:
the invention provides a wind-solar-energy storage integrated air conditioning system based on a common Direct Current bus, which comprises a Direct Current bus, an alternating Current power grid, a solar photovoltaic cell panel and a wind driven generator which are electrically connected with the Direct Current bus and used for providing electric energy for the Direct Current bus, and an air conditioning system which is electrically connected with the Direct Current bus, and further comprises a DC (Direct Current) control selector which is used for collecting the electric information of the Direct Current bus, the alternating Current power grid, the solar photovoltaic cell panel and the wind driven generator and configuring the alternating Current power grid, the solar photovoltaic cell panel and the wind driven generator according to the electric information so as to realize that the voltage provided by the Direct Current bus is in the voltage range required by the air conditioning system.
In an embodiment, the DC control selector detects whether the ac power grid is normal, and if so, selects the ac power grid to access the DC bus; if not, selecting the wind driven generator or the solar photovoltaic cell panel to be connected to the direct current bus.
In one embodiment, after the ac power grid is connected to the dc bus, whether the dc bus is normal is detected, and if yes, the solar photovoltaic cell panel, the wind power generator, and the air conditioning system are connected to the bus; or after the wind driven generator or the solar photovoltaic cell panel is connected into the direct current bus, detecting whether the direct current bus is normal, and if so, connecting the solar photovoltaic cell panel or the wind driven generator and the air conditioning system into the bus.
In one embodiment, the device further comprises an unloading system electrically connected to the direct current bus; and detecting whether the direct current bus is normal or not, and if the voltage of the direct current bus is overhigh, connecting the unloading system into the direct current bus to maintain the voltage of the direct current bus to be in a normal range.
In one embodiment, the method further comprises: and if the voltage of the direct current bus is too high, the DC control selector acquires the electrical information of the alternating current power grid, the solar photovoltaic cell panel and the wind driven generator, judges the equipment where the fault is located and cuts off the equipment where the fault is located.
In one embodiment, the DC control selector is further configured to preferentially select one of the solar photovoltaic panel and the wind turbine to be connected to the DC bus at different time periods.
In one embodiment, the energy storage device further comprises an energy storage battery electrically connected to the dc bus, and configured to exchange electrical energy with the dc bus.
In one embodiment, the system further comprises a backup load port electrically connected to the dc bus for electrically connecting a dc load.
The invention also provides a control method of the wind-solar-storage integrated air conditioning system based on the common direct current bus, which comprises the following steps: step S1, collecting the electrical information of the direct current bus, the alternating current power grid, the solar photovoltaic cell panel and the wind driven generator; and S2, configuring the alternating current power grid, the solar photovoltaic cell panel and the wind driven generator according to the electrical information so as to enable the voltage provided by the direct current bus to be within the voltage range required by the air conditioning system.
In one embodiment, the step S2 includes: step S21: detecting whether the alternating current power grid is normal or not, and if so, selecting the alternating current power grid to be connected to the direct current bus; if not, selecting the wind driven generator or the solar photovoltaic cell panel to be connected to the direct current bus; step S22: detecting whether the direct current bus is normal or not, and if so, connecting the solar photovoltaic cell panel, the wind driven generator and the air conditioning system to the direct current bus; or the solar photovoltaic cell panel or the wind driven generator and the air conditioning system are connected to the direct current bus; and if the voltage of the direct current bus is overhigh, the unloading system is connected into the direct current bus to maintain the voltage of the direct current bus to be in a normal range, the equipment where the fault is located is judged, and the equipment where the fault is located is cut off.
Compared with the prior art, the invention has the following advantages:
the direct current bus is connected with an alternating current power grid, a solar photovoltaic cell panel and a wind driven generator, electric information of the direct current bus, the alternating current power grid, the solar photovoltaic cell panel and the wind driven generator is collected through a DC control selector, and the alternating current power grid, the solar photovoltaic cell panel and the wind driven generator are configured according to the electric information, so that the voltage provided by the direct current bus is in a voltage range required by an air conditioning system, light energy and wind energy are comprehensively utilized, the dependence of the air conditioning system on the alternating current power grid is reduced, and the system is more stable and reliable in operation.
Under the condition that an alternating current power grid fails, one of the wind driven generator and the solar photovoltaic panel is preferentially selected to be connected with the direct current bus, and the direct current bus is slowly charged from 0V by utilizing the characteristic that the voltage of the controllable direct current bus of the third converter slowly rises, so that the impact on the direct current bus and the load of the direct current bus is avoided, and the running stability of the system is further improved.
By detecting the voltage of the direct current bus, when the voltage of the direct current bus is too high, the unloading system is used for releasing the pressure of the direct current bus and cutting off equipment where faults are located, the voltage of the direct current bus is maintained in a normal range, and the stability of system operation is further improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
FIG. 1 is a schematic diagram of a wind-solar-energy storage integrated air conditioning system based on a common DC bus according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a wind-solar-energy storage integrated air conditioning system based on a common DC bus according to another embodiment of the invention;
FIG. 3 is a schematic diagram of a control method of a wind-solar-energy storage integrated air conditioning system based on a common DC bus when an AC power grid is normal according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a control method of the wind-solar-energy storage integrated air conditioning system based on the common dc bus in the case of ac power grid failure in an embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The principles and construction of the present invention will be described in detail below with reference to the drawings and examples.
Referring to fig. 1, the invention provides a wind-solar-energy storage integrated air conditioning system based on a common direct current bus, which comprises a direct current bus, an alternating current power grid, a solar photovoltaic cell panel and a wind driven generator, wherein the alternating current power grid, the solar photovoltaic cell panel and the wind driven generator are electrically connected to the direct current bus and used for providing electric energy for the direct current bus, the air conditioning system is electrically connected to the direct current bus, the wind-solar-energy storage integrated air conditioning system further comprises a DC control selector and a controller, the DC control selector is used for collecting electric information of the direct current bus, the alternating current power grid, the solar photovoltaic cell panel and the wind driven generator and configuring the alternating current power grid, the solar photovoltaic cell panel and. The invention comprehensively utilizes the conversion of light energy and wind energy into electric energy to be supplied to the direct current bus, the air conditioning system and other loads, reduces the dependence of the air conditioning system and other loads on the alternating current power grid, and ensures that the system runs more stably and reliably.
The following is a detailed description of each part of the wind-solar-energy storage integrated air conditioning system based on the common dc bus.
In one embodiment, the wind, photovoltaic and energy storage integrated air conditioning system based on the common direct current bus comprises the direct current bus, and an alternating current power grid, a solar photovoltaic cell panel, a wind driven generator, an energy storage battery, an unloading system, an air conditioning system and a standby load port which are electrically connected to the direct current bus. The solar photovoltaic cell panel and the wind driven generator are used for providing electric energy for the direct current bus, and the alternating current power grid and the energy storage battery are used for providing electric energy for the direct current bus or obtaining electric energy from the direct current bus. The air conditioning system, the unloading system and the standby load port are used for consuming electric energy.
The alternating current power grid is electrically connected to the first converter and then electrically connected to the first switch K1 and the direct current bus, and is used for converting the alternating current voltage of the alternating current power grid into direct current voltage and transmitting the direct current voltage to the direct current bus. The first converter is a bidirectional AC/DC converter, and bidirectional circulation of energy between the direct current bus and the alternating current power grid is realized. When the voltage of the direct current bus is higher than the voltage of the alternating current power grid, the electric energy of the direct current bus is transmitted to the alternating current power grid. This is typically done when the solar photovoltaic panel and/or wind generator is generating more power than is needed by the air conditioning system and other loads, and the more power is fed back to the ac grid. When the voltage of the alternating current power grid is higher than that of the direct current bus, the electric energy of the alternating current power grid is transmitted to the direct current bus so as to provide the electric energy for an air conditioning system or other loads. The situation is usually used for the situation that the power generation of the solar photovoltaic cell panel and/or the wind driven generator cannot meet the power requirement of an air conditioning system and other loads, and an alternating current power grid is needed to supplement the power for the direct current bus.
The solar photovoltaic cell panel is used for converting light energy into electric energy, and is electrically connected with the second switch K2 and the direct current bus after being electrically connected with the second converter, so that the electric energy is transmitted to the direct current bus. The second converter is a unidirectional DC/DC converter.
The wind driven generator is used for converting wind energy into electric energy, and is electrically connected with the third switch K3 and the direct current bus after being electrically connected with the third converter, so that the electric energy is transmitted to the direct current bus. The third converter is a unidirectional AC/DC converter.
The energy storage battery is electrically connected to the direct current bus by being electrically connected to a fourth switch K4 after being electrically connected to a fourth converter, and the fourth converter is a bidirectional DC/DC converter. The energy storage battery is used for exchanging electric energy with the direct current bus for standby. When the solar photovoltaic cell panel and/or the wind driven generator generate insufficient power or the alternating current power grid fails, the energy storage battery is started to supply power to the direct current bus. When the electric quantity in the energy storage battery is used up, when the solar photovoltaic cell panel and/or the wind driven generator generate sufficient power or the alternating current power grid normally operates, the energy storage battery is charged by the direct current bus, and the energy storage battery is fully charged for standby.
The air conditioning system is electrically connected to the direct current bus through a fifth switch K5 electrically connected to the fifth converter, and the fifth converter is a unidirectional AC/DC converter and is used for converting the direct current voltage of the direct current bus into the alternating current voltage required by the air conditioning system.
The unloading system is electrically connected with the direct current bus through an electric connection sixth switch K6 and is used for timely unloading to stabilize the voltage of the direct current bus when the direct current bus has an overvoltage fault.
And a spare load port for electrically connecting a direct current load is also electrically connected to the direct current bus. The spare load port is electrically connected to the direct current bus through the seventh switch K7 for standby application of the external direct current load.
The first to seventh switches K1 to K7 are controlled by a DC control selector.
The DC control selector comprises a voltage collector and/or a current collector, and is respectively and electrically connected with the direct current bus, the first converter, the second converter, the third converter and the fourth converter so as to collect the voltage and/or the current of the direct current bus, the first converter, the second converter, the third converter and the fourth converter. The device is used for judging whether the voltage and/or the current of the direct current bus, the alternating current power grid, the solar photovoltaic cell panel and the wind driven generator are/is within a normal range and judging whether the voltage and/or the current and/or the electric quantity of the energy storage battery are/is within a preset range.
Referring to fig. 3-4, specifically, the DC control selector detects whether the ac power grid is normal, and if so, selects the ac power grid to access the DC bus. If not, selecting the wind driven generator and/or the solar photovoltaic cell panel to be connected to the direct current bus. Under the condition that an alternating current power grid fails, one of the wind driven generator and the solar photovoltaic panel is preferentially selected to be connected with the direct current bus, and the direct current bus is slowly charged from 0V by utilizing the characteristic that the voltage of the controllable direct current bus of the third converter slowly rises, so that the impact on the direct current bus and the load of the direct current bus is avoided, and the running stability of the system is further improved. It should be noted that, whether the ac power grid is normal or not may be detected by comparing the voltage and/or current information of the ac power grid with a preset voltage and/or current or comparing the voltage and/or current information with voltages and/or currents required by the air conditioning system and other loads. And if the voltage and/or the current of the alternating current power grid are within the preset voltage and/or current range, judging that the alternating current power grid works normally. And if the voltage and/or the current of the alternating current power grid are not within the preset voltage and/or current range, judging that the alternating current power grid has a fault. In other embodiments, it may be determined whether the ac power grid is working properly by detecting the frequency, amplitude, and phase of the voltage and/or current of the ac power grid.
And after the AC power grid is connected with the DC bus, detecting whether the DC bus is normal, and if so, connecting the solar photovoltaic cell panel, the wind driven generator and the air conditioning system into the bus. Or after the wind driven generator is connected with the direct current bus, detecting whether the direct current bus is normal, and if so, connecting the solar photovoltaic cell panel and the air conditioning system into the bus. It should be noted that, whether the detection of the dc bus is normal or not may be compared with a preset voltage and/or current or with voltages and/or currents required by the air conditioning system and other loads according to the voltage and/or current information of the dc bus. And if the voltage and/or the current of the direct current bus are within the preset voltage and/or current range or within the voltage and/or current range required by the air conditioning system and other loads, judging that the direct current bus works normally. And if the voltage and/or the current of the direct current bus are not in the preset voltage and/or current range or the voltage and/or the current required by the air conditioning system and other loads, judging that the direct current bus has a fault.
After the alternating current power grid is connected with the direct current bus or the wind driven generator is connected with the direct current bus, the voltage of the direct current bus is detected, and if the voltage of the direct current bus is too high, the unloading system is connected with the direct current bus to unload the direct current bus so as to maintain the voltage of the direct current bus to be within a normal range. Meanwhile, the DC control selector judges the equipment where the fault is located according to the voltages and/or currents of the alternating current power grid, the first converter, the solar photovoltaic cell panel, the second converter, the wind driven generator, the third converter, the energy storage battery and the fourth converter, and cuts off the equipment where the fault is located. It should be noted that, similarly to the above method for detecting whether the ac power grid and the dc bus are normal, the method for determining the device in which the fault is located also detects the voltage and/or current information of the corresponding device and compares the detected voltage and/or current information with the preset voltage and/or current information or compares the detected voltage and/or current information with the voltage and/or current information required by the air conditioning system and other loads. And if the voltage and/or the current of the corresponding equipment are within the preset voltage and/or current range, judging that the equipment works normally. And if the voltage and/or the current of the corresponding equipment are not within the preset voltage and/or current range, judging that the equipment has a fault. In other embodiments, it can be determined whether the device is working properly by detecting the frequency, amplitude, and phase of the voltage and/or current of the corresponding device. By detecting the voltage of the direct current bus, when the voltage of the direct current bus is too high, the unloading system is used for releasing the pressure of the direct current bus and cutting off equipment where faults are located, the voltage of the direct current bus is maintained in a normal range, and the stability of system operation is further improved.
In a preferred embodiment, the DC control selector determines whether the ac power grid, the solar photovoltaic cell panel, and the wind power generator are faulty or not according to voltages and/or currents and/or electric quantities of the ac power grid and the first converter, the solar photovoltaic cell panel and the second converter, the wind power generator and the third converter, and the energy storage battery and the fourth converter, and if the ac power grid, the solar photovoltaic cell panel, and the wind power generator are faulty, the DC control selector is connected to the energy storage battery and the DC bus for supplying power. And if the voltage and/or the current and/or the electric quantity of the energy storage battery are/is lower than the preset value, controlling the direct current bus to charge the energy storage battery.
In a preferred embodiment, the DC control selector is also used for preferentially selecting one of the solar photovoltaic panel and the wind driven generator to be connected to the direct current bus in different time periods. Specifically, the solar photovoltaic cell panel is selected to be connected to the direct current bus in the daytime, and the wind driven generator is selected to be connected to the direct current bus in the morning and at night.
Referring to fig. 2, in another preferred embodiment, the wind-solar-energy-storage integrated air conditioning system based on the common DC bus further includes a wind-solar complementary controller communicatively connected to the DC selection controller, the wind-solar complementary controller is further electrically connected to the second converter and the third converter respectively, and is configured to receive voltage and/or current information of the second converter and the third converter, and coordinate the solar photovoltaic cell panel and the wind power generator to cooperate with each other to access the DC bus according to the voltage and/or current information of the second converter and the third converter.
In a further alternative embodiment, a wind sensor and a light sensor are also provided, electrically connected to the DC selection controller. The wind sensor is used for detecting the wind strength in the environment and transmitting the wind strength information in the environment to the DC control selector. The light sensor is used for detecting the illumination intensity in the environment and transmitting the illumination intensity information in the environment to the DC control selector. The DC control selector compares the illumination intensity in the environment with the preset illumination intensity, and when the illumination intensity in the environment is greater than the preset illumination intensity, the solar photovoltaic panel is preferably started to supply power to the direct-current bus. The DC control selector compares the wind intensity in the environment with a preset wind intensity, and preferably starts the wind driven generator to provide electric energy for the direct current bus when the wind intensity in the environment is greater than the preset wind intensity. When the illumination intensity in the environment is greater than the preset illumination intensity and the wind power intensity is greater than the preset wind power intensity, the solar photovoltaic cell panel and the wind driven generator are selected to provide electric energy for the direct-current bus. Whether the electric quantity of the energy storage battery is insufficient is detected, and if the electric quantity of the energy storage battery is insufficient, the direct current bus is controlled to charge the energy storage battery. And if the electric quantity of the energy storage battery is sufficient, controlling the direct current bus to feed back redundant electric energy to the alternating current power grid. And when the illumination intensity in the environment is not greater than the preset illumination intensity and the wind power intensity is not greater than the preset wind power intensity, detecting whether the electric quantity of the energy storage battery is sufficient. And if the electric quantity of the energy storage battery is sufficient, controlling the energy storage battery to supply power to the direct current bus. And if the electric quantity of the energy storage battery is insufficient, controlling an alternating current power grid to supply power to the direct current bus. This embodiment is through setting up wind sensor and light sensor, according to wind-force intensity and illumination intensity rational configuration solar photovoltaic cell panel, aerogenerator, energy storage battery, alternating current network's access state to be applicable to under the different weather environment, the system can normal operating, has further promoted the stability of system operation.
Referring to fig. 3-4, the present invention further provides a control method applied to the wind, photovoltaic and energy storage integrated air conditioning system based on the common dc bus, including: step S1, collecting the electrical information of the direct current bus, the alternating current power grid, the solar photovoltaic cell panel and the wind driven generator; and step S2, configuring the alternating current power grid, the solar photovoltaic cell panel and the wind driven generator according to the electrical information so as to enable the voltage provided by the direct current bus to be within the voltage range required by the air conditioning system. It should be noted that the electrical information includes voltage and/or current information.
In a preferred embodiment, step S2 includes:
step S21: detecting whether the alternating current power grid is normal, if so, selecting the alternating current power grid to be connected to a direct current bus (figure 3); if not, the wind driven generator or the solar photovoltaic cell panel is selected to be connected to the direct current bus (figure 4).
It should be noted that, whether the ac power grid is normal or not may be detected by comparing the voltage and/or current information of the ac power grid with a preset voltage and/or current or comparing the voltage and/or current information with voltages and/or currents required by the air conditioning system and other loads. And if the voltage and/or the current of the alternating current power grid are within the preset voltage and/or current range, judging that the alternating current power grid works normally. And if the voltage and/or the current of the alternating current power grid are not within the preset voltage and/or current range, judging that the alternating current power grid has a fault. In other embodiments, it may be determined whether the ac power grid is working properly by detecting the frequency, amplitude, and phase of the voltage and/or current of the ac power grid.
Step S22: detecting whether the direct current bus is normal, if so, connecting the solar photovoltaic cell panel, the wind driven generator and the air conditioning system into the bus or connecting the solar photovoltaic cell panel and the air conditioning system into the direct current bus; and if the voltage of the direct current bus is overhigh, the unloading system is connected into the direct current bus to maintain the voltage of the direct current bus to be in a normal range, the equipment where the fault is located is judged, and the equipment where the fault is located is cut off.
It should be noted that, whether the detection of the dc bus is normal or not may be compared with a preset voltage and/or current or with voltages and/or currents required by the air conditioning system and other loads according to the voltage and/or current information of the dc bus. And if the voltage and/or the current of the direct current bus are within the preset voltage and/or current range or within the voltage and/or current range required by the air conditioning system and other loads, judging that the direct current bus works normally. And if the voltage and/or the current of the direct current bus are not in the preset voltage and/or current range or the voltage and/or the current required by the air conditioning system and other loads, judging that the direct current bus has a fault. Similarly, the method for determining the device in which the fault is located by detecting the voltage and/or current information of the corresponding device and comparing the detected voltage and/or current information with the preset voltage and/or current information or comparing the detected voltage and/or current information with the voltage and/or current information required by the air conditioning system and other loads is also used for detecting whether the alternating current power grid and the direct current bus are normal or not. And if the voltage and/or the current of the corresponding equipment are within the preset voltage and/or current range, judging that the equipment works normally. And if the voltage and/or the current of the corresponding equipment are not within the preset voltage and/or current range, judging that the equipment has a fault. In other embodiments, it can be determined whether the device is working properly by detecting the frequency, amplitude, and phase of the voltage and/or current of the corresponding device.
Compared with the prior art, the invention has the following advantages:
the direct current bus is connected with an alternating current power grid, a solar photovoltaic cell panel and a wind driven generator, the DC control selector is used for collecting the electrical information of the direct current bus, the alternating current power grid, the solar photovoltaic cell panel and the wind driven generator, and the alternating current power grid, the solar photovoltaic cell panel and the wind driven generator are configured according to the electrical information, so that the voltage provided by the direct current bus is in a voltage range required by an air conditioning system, the light energy and the wind energy are comprehensively utilized, the dependence of the air conditioning system on the alternating current power grid is reduced, and the system is more stable and reliable in operation.
Under the condition that an alternating current power grid fails, one of the wind driven generator and the solar photovoltaic panel is preferentially selected to be connected with the direct current bus, and the direct current bus is slowly charged from 0V by utilizing the characteristic that the voltage of the controllable direct current bus of the third converter slowly rises, so that the impact on the direct current bus and the load of the direct current bus is avoided, and the running stability of the system is further improved.
By detecting the voltage of the direct current bus, when the voltage of the direct current bus is too high, the unloading system is used for releasing the pressure of the direct current bus and cutting off equipment where faults are located, the voltage of the direct current bus is maintained in a normal range, and the stability of system operation is further improved.
Through setting up wind sensor and light sensor, according to wind-force intensity and illumination intensity rational configuration solar photovoltaic cell panel, aerogenerator, energy storage battery, alternating current network's access state to be applicable to under the different weather environment, the system can normal operating, has further promoted the stability of system operation.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A wind-solar-storage integrated air conditioning system based on a common direct current bus comprises a direct current bus, an alternating current power grid, a solar photovoltaic cell panel and a wind driven generator which are electrically connected to the direct current bus and used for providing electric energy for the direct current bus, and an air conditioning system which is electrically connected to the direct current bus.
2. The wind-solar-energy-storage integrated air conditioning system based on the common direct current bus as claimed in claim 1, wherein the DC control selector detects whether the alternating current power grid is normal, and if so, selects the alternating current power grid to be connected to the direct current bus; if not, selecting the wind driven generator or the solar photovoltaic cell panel to be connected to the direct current bus.
3. The wind-solar-energy-storage integrated air conditioning system based on the common direct-current bus of claim 2, wherein after the alternating-current power grid is connected to the direct-current bus, whether the direct-current bus is normal or not is detected, and if yes, the solar photovoltaic cell panel, the wind driven generator and the air conditioning system are connected to the bus;
or after the wind driven generator or the solar photovoltaic cell panel is connected into the direct current bus, detecting whether the direct current bus is normal, and if so, connecting the solar photovoltaic cell panel or the wind driven generator and the air conditioning system into the bus.
4. The wind-solar-energy-storage integrated air conditioning system based on the common direct current bus as claimed in claim 3, characterized by further comprising an unloading system electrically connected to the direct current bus; and detecting whether the direct current bus is normal or not, and if the voltage of the direct current bus is overhigh, connecting the unloading system into the direct current bus to maintain the voltage of the direct current bus to be in a normal range.
5. The wind-solar-storage integrated air conditioning system based on the common direct current bus as claimed in claim 4, further comprising: and if the voltage of the direct current bus is too high, the DC control selector acquires the electrical information of the alternating current power grid, the solar photovoltaic cell panel and the wind driven generator, judges the equipment where the fault is located and cuts off the equipment where the fault is located.
6. The wind, photovoltaic and energy storage integrated air conditioning system based on the common direct current bus as claimed in claim 1, wherein the DC control selector is further used for preferentially selecting one of the solar photovoltaic cell panel and the wind driven generator to be connected to the direct current bus in different time periods.
7. The wind, photovoltaic and energy storage integrated air conditioning system based on the common direct current bus as claimed in claim 1, further comprising an energy storage battery electrically connected to the direct current bus for exchanging electric energy with the direct current bus.
8. The co-dc bus-based wind, photovoltaic and energy storage integrated air conditioning system according to claim 1, further comprising a backup load port electrically connected to the dc bus for electrically connecting a dc load.
9. The control method of the wind-solar-energy-storage integrated air conditioning system based on the common direct current bus as claimed in any one of claims 1 to 8 is characterized by comprising the following steps:
step S1, collecting the electrical information of the direct current bus, the alternating current power grid, the solar photovoltaic cell panel and the wind driven generator;
and S2, configuring the alternating current power grid, the solar photovoltaic cell panel and the wind driven generator according to the electrical information so as to enable the voltage provided by the direct current bus to be within the voltage range required by the air conditioning system.
10. The control method according to claim 9, wherein the step S2 includes:
step S21: detecting whether the alternating current power grid is normal or not, and if so, selecting the alternating current power grid to be connected to the direct current bus; if not, selecting the wind driven generator or the solar photovoltaic cell panel to be connected to the direct current bus;
step S22: detecting whether the direct current bus is normal or not, and if so, connecting the solar photovoltaic cell panel, the wind driven generator and the air conditioning system into the bus; or the solar photovoltaic cell panel or the wind driven generator and the air conditioning system are connected to the direct current bus; and if the voltage of the direct current bus is overhigh, the unloading system is connected into the direct current bus to maintain the voltage of the direct current bus to be in a normal range, the equipment where the fault is located is judged, and the equipment where the fault is located is cut off.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010821118.6A CN111864725A (en) | 2020-08-14 | 2020-08-14 | Wind-solar-storage integrated air conditioning system based on common direct current bus and control method thereof |
| PCT/CN2021/098567 WO2022033142A1 (en) | 2020-08-14 | 2021-06-07 | Air-conditioning system and control method therefor, and control selector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010821118.6A CN111864725A (en) | 2020-08-14 | 2020-08-14 | Wind-solar-storage integrated air conditioning system based on common direct current bus and control method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111864725A true CN111864725A (en) | 2020-10-30 |
Family
ID=72969037
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010821118.6A Pending CN111864725A (en) | 2020-08-14 | 2020-08-14 | Wind-solar-storage integrated air conditioning system based on common direct current bus and control method thereof |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN111864725A (en) |
| WO (1) | WO2022033142A1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022033142A1 (en) * | 2020-08-14 | 2022-02-17 | 珠海格力电器股份有限公司 | Air-conditioning system and control method therefor, and control selector |
| CN114234309A (en) * | 2021-11-30 | 2022-03-25 | 青岛海尔空调器有限总公司 | New energy air conditioner and control method thereof, electronic equipment and storage medium |
| WO2022105263A1 (en) * | 2020-11-20 | 2022-05-27 | 珠海格力电器股份有限公司 | Photovoltaic system and control method therefor, and air conditioning system |
| CN114576796A (en) * | 2022-02-21 | 2022-06-03 | 青岛海尔空调电子有限公司 | Method and device for controlling air conditioning system, air conditioning system and storage medium |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114623509A (en) * | 2022-03-15 | 2022-06-14 | 青岛海信日立空调系统有限公司 | Photovoltaic new trend dehumidification all-in-one |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105140951A (en) * | 2015-07-12 | 2015-12-09 | 深圳市行健自动化股份有限公司 | Electric energy collecting and micro-grid coordinated operation system and method of multiple kinds of new energy |
| CN205231729U (en) * | 2015-12-24 | 2016-05-11 | 珠海格力电器股份有限公司 | Little electric network composition of direct current |
| CN105826952A (en) * | 2016-05-20 | 2016-08-03 | 上海电气分布式能源科技有限公司 | Power supply access device and protection method thereof |
| CN106786489A (en) * | 2017-01-18 | 2017-05-31 | 珠海格力电器股份有限公司 | DC micro power grid system and its control method |
| CN107040034A (en) * | 2016-02-03 | 2017-08-11 | 珠海格力电器股份有限公司 | A kind of photovoltaic energy storage air-conditioning device and control method |
| WO2017142905A1 (en) * | 2016-02-15 | 2017-08-24 | Pitt-Ohio Express LLC | Combination wind/solar dc power system |
| CN208028583U (en) * | 2018-03-29 | 2018-10-30 | 沈阳工程学院 | The user oriented multi-modal complex energy feed system of direct current heating system |
| CN211151538U (en) * | 2019-12-11 | 2020-07-31 | 江苏多益能源科技有限公司 | Multi-source power supply device applied to common alternating current-direct current bus |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104734178B (en) * | 2013-12-24 | 2017-05-10 | 珠海格力电器股份有限公司 | Solar air-conditioning system and control method thereof |
| CN107171362A (en) * | 2017-06-23 | 2017-09-15 | 深圳市盛路物联通讯技术有限公司 | A kind of intelligent power supply method and device |
| CN111864725A (en) * | 2020-08-14 | 2020-10-30 | 珠海格力电器股份有限公司 | Wind-solar-storage integrated air conditioning system based on common direct current bus and control method thereof |
-
2020
- 2020-08-14 CN CN202010821118.6A patent/CN111864725A/en active Pending
-
2021
- 2021-06-07 WO PCT/CN2021/098567 patent/WO2022033142A1/en active Application Filing
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105140951A (en) * | 2015-07-12 | 2015-12-09 | 深圳市行健自动化股份有限公司 | Electric energy collecting and micro-grid coordinated operation system and method of multiple kinds of new energy |
| CN205231729U (en) * | 2015-12-24 | 2016-05-11 | 珠海格力电器股份有限公司 | Little electric network composition of direct current |
| CN107040034A (en) * | 2016-02-03 | 2017-08-11 | 珠海格力电器股份有限公司 | A kind of photovoltaic energy storage air-conditioning device and control method |
| WO2017142905A1 (en) * | 2016-02-15 | 2017-08-24 | Pitt-Ohio Express LLC | Combination wind/solar dc power system |
| CN105826952A (en) * | 2016-05-20 | 2016-08-03 | 上海电气分布式能源科技有限公司 | Power supply access device and protection method thereof |
| CN106786489A (en) * | 2017-01-18 | 2017-05-31 | 珠海格力电器股份有限公司 | DC micro power grid system and its control method |
| CN208028583U (en) * | 2018-03-29 | 2018-10-30 | 沈阳工程学院 | The user oriented multi-modal complex energy feed system of direct current heating system |
| CN211151538U (en) * | 2019-12-11 | 2020-07-31 | 江苏多益能源科技有限公司 | Multi-source power supply device applied to common alternating current-direct current bus |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022033142A1 (en) * | 2020-08-14 | 2022-02-17 | 珠海格力电器股份有限公司 | Air-conditioning system and control method therefor, and control selector |
| WO2022105263A1 (en) * | 2020-11-20 | 2022-05-27 | 珠海格力电器股份有限公司 | Photovoltaic system and control method therefor, and air conditioning system |
| CN114234309A (en) * | 2021-11-30 | 2022-03-25 | 青岛海尔空调器有限总公司 | New energy air conditioner and control method thereof, electronic equipment and storage medium |
| CN114576796A (en) * | 2022-02-21 | 2022-06-03 | 青岛海尔空调电子有限公司 | Method and device for controlling air conditioning system, air conditioning system and storage medium |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2022033142A1 (en) | 2022-02-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111864725A (en) | Wind-solar-storage integrated air conditioning system based on common direct current bus and control method thereof | |
| CN103441566B (en) | The collaborative electric power system of a kind of civil power, photovoltaic cell and energy-storage battery and method | |
| CN103733465B (en) | Charging device | |
| US8946933B2 (en) | Power management apparatus and method of operating the same | |
| CN103023127B (en) | Solar air conditioner and power supply method thereof | |
| KR101997535B1 (en) | Mamless-type islanded microgrid system and control method thereof | |
| JP4641507B2 (en) | Power supply system | |
| CN201786566U (en) | Off-grid perpendicular shaft wind-driven generator control system with continuous power supply | |
| KR102299604B1 (en) | An energy storage system | |
| CN104320048A (en) | Photovoltaic power generation system with energy storage function and coordinated power supply method of photovoltaic power generation system | |
| CN111953016B (en) | Mobile multi-energy micro-grid control method and system | |
| CN105978008B (en) | A kind of redox flow battery energy storage system and its working method with wind field black starting-up function | |
| CN102185329A (en) | Super-capacitor-based DC voltage sag suppression device and suppression method thereof | |
| CN104617605A (en) | Microgrid control system and method | |
| CN113328512A (en) | Power supply system | |
| CN201629692U (en) | Domestic energy-saving power supply system for solar, tap water hydraulic, wind hybrid concentrated power supply | |
| CN112467794A (en) | Photovoltaic air conditioner power supply system and power supply method thereof | |
| KR102222560B1 (en) | An energy storage system | |
| CN211377693U (en) | Power transmission line hybrid power supply based on solar energy and induction energy obtaining | |
| CN102522814A (en) | Wind-solar hybrid distribution type generating set | |
| CN204668970U (en) | Microgrid control system | |
| CN201674268U (en) | Combined power supply system for warehouse ventilation equipment and mains supply | |
| CN114977304A (en) | Wind, light, diesel and energy storage integrated power supply system and method | |
| CN106356977B (en) | A kind of guard method of solar energy protection storage battery under-voltage circuit | |
| CN219833775U (en) | Power supply system with smoke alarm device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20201030 |