CN114977474A - Alternating current energy storage system for avoiding shutdown of air conditioner - Google Patents
Alternating current energy storage system for avoiding shutdown of air conditioner Download PDFInfo
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- CN114977474A CN114977474A CN202210719879.XA CN202210719879A CN114977474A CN 114977474 A CN114977474 A CN 114977474A CN 202210719879 A CN202210719879 A CN 202210719879A CN 114977474 A CN114977474 A CN 114977474A
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- 238000004146 energy storage Methods 0.000 title claims abstract description 58
- 238000004891 communication Methods 0.000 claims abstract description 42
- 230000033228 biological regulation Effects 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 7
- 230000002159 abnormal effect Effects 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 230000005611 electricity Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
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Classifications
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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
- 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
- H02J9/062—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 AC powered loads
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- 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
- F24F11/32—Responding to malfunctions or emergencies
- F24F11/37—Resuming operation, e.g. after power outages; Emergency starting
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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
- H02J3/007—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources
-
- 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
- H02J3/007—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources
- H02J3/0073—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources for providing alternative feeding paths between load and source when the main path fails, e.g. transformers, busbars
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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
- H02J3/02—Circuit arrangements for AC mains or AC distribution networks using a single network for simultaneous distribution of power at different frequencies; using a single network for simultaneous distribution of AC power and of DC power
-
- 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
- H02J9/068—Electronic means for switching from one power supply to another power supply, e.g. to avoid parallel connection
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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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/12—Energy storage units, uninterruptible power supply [UPS] systems or standby or emergency generators, e.g. in the last power distribution stages
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention belongs to the technical field of power distribution systems, and relates to an alternating current energy storage system for avoiding shutdown of an air conditioner. The system adds the air conditioner starting function on the basis of the existing energy storage system, not only utilizes the communication power supply and the storage battery to keep the normal power supply of the direct current load equipment when the air conditioner is started, but also ensures the regulation of the environment temperature and humidity in the communication base station under the condition of power failure of the power grid, keeps the normal work of the communication base station, reduces the power of the equipped energy storage inverter, and reduces the equipment cost.
Description
Technical Field
The invention relates to the technical field of power distribution systems, in particular to an alternating current energy storage system for avoiding shutdown of an air conditioner.
Background
The communication base station generally adopts a remote duty mode, and no one operates on site. However, the communication base station is difficult to avoid the situation of power failure of the power grid due to alternating current, so an energy storage system is often adopted and a battery is equipped as a backup power supply to supply power to direct current load equipment. Before the maintenance worker arrives, the trouble that the power grid can not work continuously caused by power failure can be avoided. Although the prior energy storage system can delay the shutdown problem of the communication base station caused by power failure, another hidden danger is involved, which is the temperature and humidity regulation problem caused by the continuous operation of the electronic equipment in the communication base station.
If the heat productivity in the communication base station is large and high temperature is generated, the normal operation of the equipment can be influenced, and if the internal environment of the communication base station is moist, the corrosion and breakdown of electronic devices can be caused, so that the use reliability of the equipment is influenced. An air conditioner is installed in the communication base station in order to cope with various problems caused by the internal and external environments and the climate. The dc energy storage system can supply dc power in reverse, but the air conditioners used in the communication base stations are generally ac devices that require a relatively large amount of current to start up than to maintain proper operation. When the communication base station is powered off by alternating current, the air conditioner stops working and cannot adjust the ambient temperature and humidity, and the direct-current energy storage system cannot provide a large starting current, so that the air conditioner cannot be restarted even if the electronic equipment of the communication base station is kept working, and finally the electronic equipment is damaged due to temperature and humidity problems.
In the past, the problem of standby power of a base station air conditioner is solved, and a diesel generator or a UPS is arranged in the conventional scheme. However, there are some drawbacks to each of these two approaches:
if the diesel generator is used as alternating current standby power, the diesel generator needs to be provided with a self-starting function. In addition, a device which is interlocked with a normal mains supply input loop is required to be added on the power distribution to ensure that when the mains supply is recovered, the equipment cannot be damaged due to the problem that the phases of the two alternating current sources are inconsistent. Therefore, the structure is more complex and the vulnerable points are more. The diesel generator also needs to be maintained regularly, and the labor cost is high.
If the UPS is used as a standby power supply and has an automatic switching function, the problem of equipment damage caused by inconsistent phases of two alternating current sources can be avoided when the commercial power is recovered. Because the starting current of the base station air conditioners of different manufacturers and different models is different. Particularly, when the auxiliary heating device is started in winter, the starting current requirement is high, so that a UPS with high power needs to be configured. The UPS consumes the electricity in the battery when working in the standby power mode. A more powerful UPS requires more batteries, which also means a larger volume.
Therefore, an energy storage system is improved, and the hidden danger that heating of direct-current load equipment cannot be controlled due to the fact that the air conditioner cannot be started during power failure is solved.
Disclosure of Invention
The invention mainly aims to provide an alternating current energy storage system for avoiding the shutdown of an air conditioner, which not only ensures the continuous work of direct current load equipment during power failure, but also ensures that the air conditioner can be restarted, and avoids the damage of the direct current load equipment due to the temperature and humidity problem caused by heating.
The invention realizes the purpose through the following technical scheme: the utility model provides an avoid alternating current energy storage system that air conditioner shut down, include with electric wire netting bus connection the distribution module, with distribution module exchange the energy storage part of connecting and with distribution module exchange the communication power who connects, communication power passes through the direct current load equipment that two direct current buses connect, distribution module lies in an air conditioner, two are exchanged on the independent branch road of communication power an air conditioner, two be connected with the battery between the direct current bus.
Specifically, the energy storage part including exchange connect in energy storage inverter on the distribution module and connect in the battery management module of the energy storage inverter other end, be equipped with one on the electric wire netting bus and be used for detecting the commercial power unusual in order to switch the two kinds of mode's of energy storage inverter power supply and stand-by electricity smart electric meter.
Further, be equipped with first input switch on the electric wire netting bus, the distribution module with be equipped with second input switch between the energy storage part, the distribution module arrives be equipped with third input switch between the communication power supply, the distribution module with be equipped with fourth input switch between the air conditioner, the distribution module independent control first input switch the second input switch the third input switch with the switching of fourth input switch.
The technical scheme of the invention has the beneficial effects that:
the system adds the air conditioner starting function on the basis of the existing energy storage system, not only utilizes the communication power supply and the storage battery to keep the normal power supply of the direct current load equipment when the air conditioner is started, but also ensures the regulation of the environment temperature and humidity in the communication base station under the condition of power failure of the power grid, keeps the normal work of the communication base station, reduces the power of the equipped energy storage inverter, and reduces the equipment cost.
Drawings
FIG. 1 is a connection diagram of an AC energy storage system for avoiding shutdown of an air conditioner according to an embodiment.
The labels in the figures indicate:
1-a power grid bus, 2-a first input switch, 3-a smart meter, 4-a power distribution module, 5-an energy storage inverter, 6-a battery management module, 7-a second input switch, 8-a third input switch, 9-a communication power supply, 10-a direct current bus, 11-direct current load equipment, 12-a fourth input switch, 13-an air conditioner and 14-a storage battery.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
Example (b):
as shown in fig. 1, the ac energy storage system for avoiding shutdown of an air conditioner according to the present invention includes a power distribution module 4 connected to a power grid bus 1, an energy storage part (including an energy storage inverter 5 and a battery management module 6) ac-connected to the power distribution module 4, and a communication power supply 9 ac-connected to the power distribution module 4, wherein the communication power supply 9 is connected to a dc load device 11 through two dc buses 10, a storage battery 14 is connected between the two dc buses 10, and the power distribution module 4 is further ac-connected to an air conditioner 13. When the input end of the power grid bus 1 is in a power failure condition, the power distribution module 4 cuts off power supply to the communication power supply 9, and the energy storage part increases the alternating current supply to the branch of the air conditioner 13. Since the power is stored in the storage battery 14 during normal operation, even if the communication power supply 9 does not output direct current, the storage battery 14 can still maintain normal power supply to the direct current load device 11 for a certain period of time; after the air conditioner 13 is started, the power demand of the air conditioner 13 is reduced, the power distribution module 4 can be connected with the communication power supply 9 again, and the energy storage part normally transmits power to the communication power supply 9. In the entire process, the power of the dc load device 11 is not stopped, and the air conditioner 13 can be restarted even if it is stopped. The design that the communication power supply 9 branch and the air conditioner 13 branch of the main loop are separated avoids the impact current superposition caused by the frequency reduction starting of the communication power supply 9 when the air conditioner 13 is in frequency reduction starting, and ensures that the system finishes the frequency reduction starting process. Therefore, the system is added with the starting function of the air conditioner 13 on the basis of the existing energy storage system, normal power supply of the direct current load equipment 11 when the air conditioner 13 is started is kept by utilizing the communication power supply 9 and the storage battery 14, and the normal work of the communication base station is kept by adjusting the environment temperature and humidity in the communication base station under the condition of power failure of a power grid.
The key component of the air conditioner 13 is a compressor, and the reason why the starting current of the air conditioner 13 is larger than the working current is that the current of the compressor is larger when the compressor is started than when the compressor is normally operated. The electromagnetic analysis of the asynchronous motor shows that the starting initial equivalent circuit of the three-phase asynchronous motor and the starting current I of each phase of the three-phase induction motor s With total starting torque T s From the equivalent circuit, it is calculated as:
equation 1:
formula 2: T S ＝(3/ω S )×U 1 2 ×R′ 2 /[(R 1 +R′ 2 ) 2 +(X 1 +X′ 2 ) 2 ],
Wherein: t is s For starting torque, ω s For synchronous angular rate, U 1 Is the stator supply voltage, R 1 Is stator resistance, X 1 Stator reactance, R 2 ' equivalent resistance of rotor to stator, X 2 ' is equivalent reactance converted by rotor, phi is magnetic flux per pole of rotating magnetic field, E 1 Electromotive force of stator coil, f 1 For the stator supply frequency, N 1 The number of turns of the stator coil. Rotor resistance R 2 Since equations 1 and 2 are calculated in terms of motor to stator equivalent circuits, the rotor resistance is written as R 2 ’，R 2 ’＝a 2 R 2 And a is the turn ratio of the stator winding to the rotor winding.
Reducing the starting current I according to equation 1 s Has a feasible method of reducing the power supply voltage U 1 And increasing the rotor resistance R 2 Two ways. If the influence of the starting torque is considered again, the reduced power supply voltage U is found from equation 2 1 Although the starting current I can be reduced s But starting torque T s Also reduce, to maintain U 1 2 /ω s If the ratio is constant, the starting torque can be kept constant. Such as a U 1 The starting current is reduced to half of the rated voltage, and the power frequency needs to be changed to 1/4 in order to ensure the starting torque. Through practical tests, the energy storage inverter 5 with the off-grid rated function of 10kW (the maximum output current effective value is 30A) can be started by heating 5 air conditioners 13 (the peak value of the starting current is about 100A under the condition of connecting a power grid through tests), and can be operated by a communication power supply 9 with 1.5kW load after the start is finished. Therefore, the new system can effectively reduce the off-grid mode starting mode, namely the frequency reduction starting mode, of the starting current of the air conditioner 13, and effectively reduce the starting current impact of the air conditioner 13.
According to the principle that when the electromotive force of a motor and the energy storage inverter 5 run off-grid, the alternating current output voltage and the frequency value can be simultaneously controlled, and aiming at the starting problem of the base station air conditioner 13, the energy storage system respectively connects the communication power supply 9 and the air conditioner 13 on two branches on the circuit design, increases specific on-off time sequences in the starting stage, and also increases targeted variable frequency voltage reduction starting in an energy storage inverter 5 off-grid control strategy to reduce the starting current of the air conditioner 13, thereby reducing the power of the equipped energy storage inverter 5 and reducing the equipment cost.
As shown in fig. 1, the energy storage portion includes an energy storage inverter 5 ac-connected to the power distribution module 4 and a battery management module 6 connected to the other end of the energy storage inverter 5, and an intelligent electric meter 3 for detecting an abnormal commercial power to switch two working modes of power supply and standby power supply of the energy storage inverter 5 is disposed on the power grid bus 1. The specific working conditions are as follows:
1) when the mains supply is normal: the direct current load device 11 is also powered by the communication power supply 9; the energy storage inverter 5 automatically judges whether the current base station load exceeds the demand through communicating with the intelligent electric meter 3, and automatically controls the charging and discharging state and power of the battery, so that the demand management function is realized; on the basis, the energy storage system automatically judges the electricity price to be high or low to execute the peak clipping and valley filling mode under the allowable condition.
2) When the commercial power is abnormal: if the intelligent electric meter 3 detects that the commercial power is abnormal, the energy storage inverter 5 can be switched to a standby power mode, and the work of the communication power supply 9 and the air conditioner 13 is guaranteed. According to the control method provided by the invention, after the off-grid is cut off and the voltage reduction and frequency conversion starting condition is triggered, the output voltage is reduced to half of the rated voltage, and then the control is carried out according to the control method.
As shown in fig. 1, a first input switch 2 is arranged on a power grid bus 1, a second input switch 7 is arranged between a power distribution module 4 and an energy storage part, a third input switch 8 is arranged between the power distribution module 4 and a communication power supply 9, a fourth input switch 12 is arranged between the power distribution module 4 and an air conditioner 13, and the power distribution module 4 independently controls the first input switch 2, the second input switch 7, the third input switch 8 and the fourth input switch 12 to be opened and closed. When finding that the commercial power is abnormal, the intelligent electric meter 3 informs the energy storage inverter 5 to switch to the off-grid operation mode, the original control alternating current output current is changed into control alternating current output voltage and frequency, and simultaneously informs the power distribution module 4 to disconnect the first input switch 2 and the third input switch 8 and close the second input switch 7 and the fourth input switch 12. Then the energy storage inverter 5 automatically enters a variable frequency voltage reduction starting state, namely the output voltage is controlled to be U 0 Controlling the inverter output frequency to be f 0 ＝f N U 0 2 /U N 2 (in the formula, U) N Rated output voltage f for energy storage inverter 5 off-grid N At the nominal output frequency) and then slowly reverts to the normal frequency value. In the whole process, the output voltage U of the energy storage inverter 5 is equal to U 0 + kt, wherein U 0 The initial voltage, k is the increasing scaling factor, and t is the adjustment interval. The output frequency of the energy storage inverter 5 is recovered to a rated frequency value and is stabilized for a period of time, the energy storage inverter 5 is ensured to be stabilized in the off-grid output voltage and frequency, the power distribution module 4 closes the third input switch 8 to supply power to the communication power supply 9, and the standby power starting process is completed. When the commercial power is recovered to be normal, the intelligent electric meter 3 informs the energy storage inverter 5 to enter grid-connected operation, the power distribution module 4 controls the first input switch 2 to be closed, and the system is recovered to be in a grid-connected operation state.
What has been described above are merely some embodiments of the present invention. It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the inventive concept thereof, and these changes and modifications can be made without departing from the spirit and scope of the invention.
Claims (3)
1. The utility model provides an avoid exchanging energy storage system that air conditioner shut down, include with the distribution module of electric wire netting bus connection, with distribution module exchanges the energy storage part of connecting and with distribution module exchanges the communication power supply who connects, communication power supply is through the direct current load equipment that two direct current buses are connected, its characterized in that: the power distribution module is characterized in that an air conditioner is connected to the independent branch circuit of the communication power supply in an alternating-current mode, and a storage battery is connected between the two direct-current buses.
2. An ac energy storage system to avoid air conditioner shutdowns as set forth in claim 1, wherein: the energy storage part comprises an energy storage inverter connected to the power distribution module in an alternating-current mode and a battery management module connected to the other end of the energy storage inverter, and an intelligent electric meter used for switching the working mode of the energy storage inverter is arranged on the power grid bus.
3. An ac energy storage system to avoid air conditioner shutdowns as set forth in claim 2, wherein: be equipped with first input switch on the electric wire netting bus, the distribution module with be equipped with second input switch between the energy storage part, the distribution module arrives be equipped with third input switch between the communication power supply, the distribution module with be equipped with fourth input switch between the air conditioner, the distribution module independent control first input switch the second input switch the third input switch with the switching of fourth input switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210719879.XA CN114977474A (en) | 2022-06-23 | 2022-06-23 | Alternating current energy storage system for avoiding shutdown of air conditioner |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210719879.XA CN114977474A (en) | 2022-06-23 | 2022-06-23 | Alternating current energy storage system for avoiding shutdown of air conditioner |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115854447A (en) * | 2022-12-22 | 2023-03-28 | 珠海格力电器股份有限公司 | Control method of photovoltaic air conditioning system |
| CN119340991A (en) * | 2024-11-04 | 2025-01-21 | 广东立德电气有限公司 | Intelligent power distribution method and device for electric meter box, electric meter and electronic equipment |
-
2022
- 2022-06-23 CN CN202210719879.XA patent/CN114977474A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115854447A (en) * | 2022-12-22 | 2023-03-28 | 珠海格力电器股份有限公司 | Control method of photovoltaic air conditioning system |
| CN119340991A (en) * | 2024-11-04 | 2025-01-21 | 广东立德电气有限公司 | Intelligent power distribution method and device for electric meter box, electric meter and electronic equipment |
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