CN112234705A - Industrial standby power supply system and control method thereof - Google Patents

Industrial standby power supply system and control method thereof Download PDF

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Publication number
CN112234705A
CN112234705A CN202011099446.6A CN202011099446A CN112234705A CN 112234705 A CN112234705 A CN 112234705A CN 202011099446 A CN202011099446 A CN 202011099446A CN 112234705 A CN112234705 A CN 112234705A
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China
Prior art keywords
power supply
standby power
photovoltaic
energy storage
alternating current
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CN202011099446.6A
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Chinese (zh)
Inventor
高梓健
许�鹏
闫德霖
张健
陈思琪
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Zhuhai Gree Energy Environment Technology Co Ltd
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Zhuhai Gree Energy Environment Technology Co Ltd
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Priority to CN202011099446.6A priority Critical patent/CN112234705A/en
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J9/00Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04Circuit 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
    • H02J9/06Circuit 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
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/34Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
    • H02J7/35Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20The dispersed energy generation being of renewable origin
    • H02J2300/22The renewable source being solar energy
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B10/00Integration of renewable energy sources in buildings
    • Y02B10/70Hybrid systems, e.g. uninterruptible or back-up power supplies integrating renewable energies
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/30Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/50Photovoltaic [PV] energy
    • Y02E10/56Power conversion systems, e.g. maximum power point trackers
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P80/00Climate change mitigation technologies for sector-wide applications
    • Y02P80/10Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P80/00Climate change mitigation technologies for sector-wide applications
    • Y02P80/20Climate change mitigation technologies for sector-wide applications using renewable energy
    • YGENERAL 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
    • Y04INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04SSYSTEMS 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
    • Y04S20/00Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/20End-user application control systems

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The invention relates to an industrial standby power supply system and a control method thereof. According to the technical scheme provided by the invention, on the basis that the energy storage standby power supply is used as the black start power supply, the photovoltaic power generation is added, and due to the matched use of the energy storage standby power supply and the photovoltaic standby power supply, when the power grid is in power failure, the photovoltaic standby power supply can be driven by the fast black start energy of the energy storage standby power supply to transmit electric energy, and meanwhile, the photovoltaic standby power supply can effectively slow down the electric energy consumption of the energy storage standby power supply, so that the photovoltaic system can get rid of island protection, fully utilize new energy, and simultaneously solve the problem of continuity when the single energy storage standby power supply supplies power, so that the stable operation time of the micro-grid is longer, and.

Description

Industrial standby power supply system and control method thereof
Technical Field
The invention relates to the technical field of intelligent control of a power grid, in particular to an industrial standby power supply system and a control method thereof.
Background
At present, industrial systems, particularly manufacturing industries, have high requirements on sustainable power supply of standby power sources due to large power consumption of industrial characteristics.
Almost all standby power supplies used by industrial systems are diesel generators, the power-off response time of the diesel generators is slow, and when a power grid loses power, the diesel generators need to be started for a long time, so that large industrial loss is caused. The capacity of the diesel generator is limited, and the diesel generators equipped in the general industrial manufacturing industry are all small generators, can only drive a small part of primary and secondary loads, and have small help on the sustainability of production; on the other hand, the diesel generator has a large environmental impact because the power source is diesel thermal power, and a new energy source is sought as a standby power source to support the stability and the continuity of large-area power supply of an industrial system.
In recent years, there are examples in which an energy storage system is tried as a backup power supply, but since an electrical load for an industrial system is large, the loss of an energy storage battery increases with the increase of the load; on the other hand, the existing light storage self-power supply technology is usually small in capacity, and a light storage system is integrated in a converter, so that the light storage self-power supply technology is not beneficial to an industrial system with large power consumption load and is large in limitation. At present, a photovoltaic power generation system has island protection, and when a power grid loses power, the photovoltaic power generation system must be forcibly disconnected and cannot supply power for local loads.
In the related art, an energy storage system based on light storage complementary micro-grid self-power supply is described, which effectively solves the disadvantage of micro-grid self-power supply, but the technology uses a photovoltaic system as a standby power supply for black start of the energy storage system to ignore an island effect protection mechanism of the photovoltaic system, so the technology has relative limitation and is not comprehensive.
Disclosure of Invention
In view of this, the present invention provides an industrial standby power system and a control method thereof, so as to solve the problems of slow response speed of a diesel generator, high power consumption of an energy storage system, and islanding of a photovoltaic system in the power grid loss in the prior art.
According to a first aspect of embodiments of the present invention, there is provided an industrial standby power supply system, comprising:
the alternating current output end of the energy storage standby power supply is connected with the line outlet end of the commercial power;
the alternating current output end of the photovoltaic standby power supply is connected with the alternating current output end of the energy storage standby power supply in parallel;
the detection device is used for detecting the illumination intensity of the environment where the photovoltaic standby power supply is located;
and the controller is used for controlling the energy storage standby power supply to serve as a power failure black start power supply when the power grid loses power, and controlling whether the photovoltaic standby power supply serves as a standby power supply or not according to the illumination intensity.
Preferably, after the alternating current output end of the photovoltaic standby power supply is connected in parallel with the alternating current output end of the energy storage standby power supply, the alternating current output end of the photovoltaic standby power supply is uniformly connected to a power supply bus with a corresponding voltage grade.
Preferably, the energy storage backup power supply comprises: the energy storage converter is connected with the energy storage battery; and/or the presence of a gas in the gas,
the photovoltaic standby power supply comprises: the photovoltaic module and the photovoltaic inverter are connected with the photovoltaic module.
According to a second aspect of the embodiments of the present invention, there is provided a control method of an industrial standby power supply system, including:
detecting the illumination intensity of the environment where the photovoltaic standby power supply is located;
when the power grid loses power, the energy storage standby power supply is controlled to be used as a power failure black start power supply, and whether the photovoltaic standby power supply is used as a standby power supply is controlled according to the illumination intensity;
the alternating current output end of the energy storage standby power supply is connected with the line outlet end of the commercial power;
and the alternating current output end of the photovoltaic standby power supply is connected with the alternating current output end of the energy storage standby power supply in parallel.
Preferably, the controlling whether the photovoltaic backup power source is used as a backup power source comprises:
when the power grid loses power and the illumination intensity meets the starting condition of the photovoltaic standby power supply, controlling the energy storage standby power supply to work as a voltage source, and starting the photovoltaic standby power supply to serve as the standby power supply;
when the power grid loses power and the illumination intensity cannot meet the starting condition of the photovoltaic standby power supply, the energy storage standby power supply is controlled to work independently as a voltage source, and the photovoltaic standby power supply is not started.
Preferably, the photovoltaic standby power supply is started as a standby power supply, and specifically:
and detecting whether the output voltage of the energy storage standby power supply meets the starting condition of the photovoltaic standby power supply, if so, starting the photovoltaic standby power supply, otherwise, not starting the photovoltaic standby power supply.
Preferably, the method further comprises:
and when the output voltage of the energy storage standby power supply does not meet the starting condition of the photovoltaic standby power supply, adjusting the output voltage of the energy storage standby power supply until the output voltage of the energy storage standby power supply meets the starting condition of the photovoltaic standby power supply.
Preferably, the starting photovoltaic standby power supply specifically includes:
and starting the photovoltaic standby power supply by adopting an automatic reclosing mode.
Preferably, the method further comprises:
after the photovoltaic standby power supply is started, the photovoltaic standby power supply is controlled to be used as a current source to participate in electric energy transmission, and,
and controlling the current of the power grid to be transmitted only by the photovoltaic standby power supply.
Preferably, the method further comprises:
when the power grid normally supplies power, controlling an energy storage standby power supply to serve as a current source for grid-connected power supply; and/or the presence of a gas in the gas,
and controlling the photovoltaic standby power supply to serve as a current source for grid-connected power supply.
The technical scheme provided by the embodiment of the invention can have the following beneficial effects:
when the power grid loses power, the energy storage standby power supply is controlled to serve as a power failure black starting power supply, and whether the photovoltaic standby power supply serves as the standby power supply is controlled according to the illumination intensity, so that stable power supply of the standby power supply is realized when the power grid loses power. According to the technical scheme provided by the invention, on the basis that the energy storage standby power supply is used as the black start power supply, the photovoltaic power generation is added, and due to the matched use of the energy storage standby power supply and the photovoltaic standby power supply, when the power grid is in power failure, the photovoltaic standby power supply can be driven by the fast black start energy of the energy storage standby power supply to transmit electric energy, and meanwhile, the photovoltaic standby power supply can effectively slow down the electric energy consumption of the energy storage standby power supply, so that the photovoltaic system can get rid of island protection, fully utilize new energy, and simultaneously solve the problem of continuity when the single energy storage standby power supply supplies power, so that the stable operation time of the micro-grid is longer, and.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
FIG. 1 is a schematic diagram of an industrial backup power system shown in accordance with an exemplary embodiment;
FIG. 2 is a flow chart illustrating a method of controlling an industrial backup power system in accordance with an exemplary embodiment;
FIG. 3 is a flow chart illustrating a method of controlling an industrial backup power system according to another exemplary embodiment.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the invention, as detailed in the appended claims.
FIG. 1 is a schematic diagram illustrating an industrial backup power system according to an exemplary embodiment, as shown in FIG. 1, including:
the alternating current output end of the energy storage standby power supply 1 is connected with the line outlet end of the commercial power;
the alternating current output end of the photovoltaic standby power supply 2 is connected with the alternating current output end of the energy storage standby power supply 1 in parallel;
a detection device (not shown in the drawings) for detecting the illumination intensity of the environment in which the photovoltaic backup power supply 2 is located;
and the controller (not shown in the drawing) is used for controlling the energy storage standby power supply 1 to be used as a power failure black start power supply when the power grid loses power, and controlling whether the photovoltaic standby power supply 2 is used as a standby power supply or not according to the illumination intensity.
It can be understood that, the technical scheme that this embodiment provided through when the electric wire netting loses power, control energy storage stand-by power supply as power failure black start power to according to illumination intensity, whether control photovoltaic stand-by power supply is as stand-by power supply, thereby when having realized the electric wire netting loses power, stand-by power supply's steady power supply. The technical scheme that this embodiment provided, on energy storage stand-by power supply is as black start power supply's basis, add photovoltaic power generation, because energy storage stand-by power supply and photovoltaic stand-by power supply's cooperation is used, when the electric wire netting loses the electricity, energy storage stand-by power supply's quick black start energy band moves photovoltaic stand-by power supply and carries the electric energy, photovoltaic stand-by power supply can effectively slow down energy storage stand-by power supply's power consumption simultaneously, supplement each other, make photovoltaic system break away from island protection, make full use of new forms of energy, continuity problem when also solving single energy storage stand-by power supply simultaneously, it is longer to make little electric wire netting steady operation duration, economic benefits is.
Preferably, after the alternating current output end of the photovoltaic standby power supply 2 is connected in parallel with the alternating current output end of the energy storage standby power supply 1, the alternating current output ends are uniformly connected to power supply buses with corresponding voltage levels.
Preferably, the energy storage backup power supply 1 comprises: the energy storage device comprises an energy storage battery 11 and an energy storage current transformer 12 connected with the energy storage battery 11; and/or the presence of a gas in the gas,
the photovoltaic standby power supply 2 includes: a photovoltaic module 21, and a photovoltaic inverter 22 connected to the photovoltaic module 21.
It can be understood that the industrial standby power supply system provided by the embodiment has the advantages of simple structure, convenience in construction, low maintenance and modification cost, good user experience degree and high satisfaction degree.
Fig. 2 is a flowchart illustrating a method of controlling an industrial backup power system according to an exemplary embodiment, as shown in fig. 2, the method including:
step S11, detecting the illumination intensity of the environment where the photovoltaic standby power supply is located;
step S12, when the power grid loses power, the energy storage standby power supply is controlled to be used as a black-start power supply during power failure, and whether the photovoltaic standby power supply is used as a standby power supply is controlled according to the illumination intensity;
the alternating current output end of the energy storage standby power supply is connected with the line outlet end of the commercial power;
and the alternating current output end of the photovoltaic standby power supply is connected with the alternating current output end of the energy storage standby power supply in parallel.
It should be noted that the technical solution provided in this embodiment is applicable to an industrial standby power supply system.
It can be understood that, the technical scheme that this embodiment provided through when the electric wire netting loses power, control energy storage stand-by power supply as power failure black start power to according to illumination intensity, whether control photovoltaic stand-by power supply is as stand-by power supply, thereby when having realized the electric wire netting loses power, stand-by power supply's steady power supply. The technical scheme that this embodiment provided, on energy storage stand-by power supply is as black start power supply's basis, add photovoltaic power generation, because energy storage stand-by power supply and photovoltaic stand-by power supply's cooperation is used, when the electric wire netting loses the electricity, energy storage stand-by power supply's quick black start energy band moves photovoltaic stand-by power supply and carries the electric energy, photovoltaic stand-by power supply can effectively slow down energy storage stand-by power supply's power consumption simultaneously, supplement each other, make photovoltaic system break away from island protection, make full use of new forms of energy, continuity problem when also solving single energy storage stand-by power supply simultaneously, it is longer to make little electric wire netting steady operation duration, economic benefits is.
Preferably, the controlling whether the photovoltaic backup power source is used as a backup power source comprises:
when the power grid loses power and the illumination intensity meets the starting condition of the photovoltaic standby power supply, controlling the energy storage standby power supply to work as a voltage source, and starting the photovoltaic standby power supply to serve as the standby power supply;
when the power grid loses power and the illumination intensity cannot meet the starting condition of the photovoltaic standby power supply, the energy storage standby power supply is controlled to work independently as a voltage source, and the photovoltaic standby power supply is not started.
It can be understood that when the power grid loses power, the micro power grid is in an island state, the photovoltaic system loses power firstly due to the island effect, and at the moment, the energy storage standby power supply is quickly responded and automatically started and works in a voltage source mode. If the illumination intensity meets the starting condition of the photovoltaic standby power supply, the photovoltaic standby power supply can be started to serve as the standby power supply; and if the illumination intensity cannot meet the starting condition of the photovoltaic standby power supply, the photovoltaic standby power supply is not started to serve as the standby power supply, and the energy storage standby power supply is controlled to independently serve as a voltage source to work.
The technical scheme that this embodiment provided to on the basis of energy storage stand-by power supply as black start power, add photovoltaic power generation, make photovoltaic system break away from island protection, make full use of new forms of energy also solves the continuity problem when single energy storage stand-by power supply simultaneously, and user experience degree is good, the satisfaction is high.
Preferably, the photovoltaic standby power supply is started as a standby power supply, and specifically:
and detecting whether the output voltage of the energy storage standby power supply meets the starting condition of the photovoltaic standby power supply, if so, starting the photovoltaic standby power supply, otherwise, not starting the photovoltaic standby power supply.
Preferably, the method further comprises:
and when the output voltage of the energy storage standby power supply does not meet the starting condition of the photovoltaic standby power supply, adjusting the output voltage of the energy storage standby power supply until the output voltage of the energy storage standby power supply meets the starting condition of the photovoltaic standby power supply.
It can be understood that, when the electric wire netting loses power, detection device can automated inspection illuminance to reach whether input current can satisfy photovoltaic stand-by power supply's starting condition, if can not, then photovoltaic stand-by power supply is out of work, and energy storage stand-by power supply supplies power to the load with the voltage source form alone, and when the illumination condition satisfied starting condition, photovoltaic stand-by power supply then put into operation again, and as stand-by power supply together with energy storage stand-by power supply, the reliability and the persistence of improvement system power supply.
Preferably, the starting photovoltaic standby power supply specifically includes:
and starting the photovoltaic standby power supply by adopting an automatic reclosing mode.
It should be noted that the automatic reclosing is widely applied to overhead line power transmission and effective anti-accident measures (cable power transmission and power supply cannot be adopted) on an overhead line power supply line. Namely, when a circuit has a fault and the relay protection causes the breaker to trip, the automatic reclosing device causes the breaker to reclose after a short time interval.
In most cases, line faults (such as lightning stroke, wind damage and the like) are temporary, the insulation performance (insulators and air gaps) of the lines can be recovered after the circuit breakers are tripped, and reclosing can be successful, so that the reliability of power supply of the power system is improved. And in few cases, the automatic reclosing device is in permanent fault, and then is tripped out by relay protection after acting, the reason is found out, and then the power is transmitted again. In general, the faster the reclosing after the line fault trips, the better the effect.
This embodiment adopts the mode of autoeclosing, starts photovoltaic stand-by power supply, simple structure, with low costs, can the express delivery start photovoltaic stand-by power supply, and user experience is good, the satisfaction is high.
Preferably, the method further comprises:
after the photovoltaic standby power supply is started, the photovoltaic standby power supply is controlled to be used as a current source to participate in electric energy transmission, and,
and controlling the current of the power grid to be transmitted only by the photovoltaic standby power supply.
It can be understood that when the energy storage backup power supply is output in the form of a voltage source, current is only transmitted by the photovoltaic backup power supply, thereby reducing the power consumption of the energy storage backup power supply.
Preferably, the method further comprises:
when the power grid normally supplies power, controlling an energy storage standby power supply to serve as a current source for grid-connected power supply; and/or the presence of a gas in the gas,
and controlling the photovoltaic standby power supply to serve as a current source for grid-connected power supply.
It can be understood that when the power grid normally supplies power, the energy storage standby power supply is detected to be in a grid-connected state and automatically serves as a current source for grid-connected power supply, the photovoltaic standby power supply also detects power on of the power grid, normal grid-connected output is achieved, and the photovoltaic standby power supply and the energy storage standby power supply operate independently, so that the stability and the reliability of the power grid are guaranteed.
Fig. 3 is a flowchart illustrating a method of controlling an industrial standby power system according to another exemplary embodiment, as shown in fig. 3, the method including:
step S21, detecting the illumination intensity of the environment where the photovoltaic standby power supply is located;
step S22, when the power grid loses power and the illumination intensity meets the starting condition of the photovoltaic standby power supply, controlling the energy storage standby power supply to work as a voltage source, detecting whether the output voltage of the energy storage standby power supply meets the starting condition of the photovoltaic standby power supply, if so, starting the photovoltaic standby power supply, otherwise, adjusting the output voltage of the energy storage standby power supply until the output voltage of the energy storage standby power supply meets the starting condition of the photovoltaic standby power supply;
step S23, when the power grid loses power and the illumination intensity can not meet the starting condition of the photovoltaic standby power supply, controlling the energy storage standby power supply to work independently as a voltage source without starting the photovoltaic standby power supply;
step S24, after the photovoltaic standby power supply is started, the photovoltaic standby power supply is controlled to be used as a current source to participate in electric energy transmission, and the current of a power grid is controlled to be transmitted only by the photovoltaic standby power supply;
the alternating current output end of the energy storage standby power supply is connected with the line outlet end of the commercial power;
and the alternating current output end of the photovoltaic standby power supply is connected with the alternating current output end of the energy storage standby power supply in parallel.
It should be noted that the technical solution provided in this embodiment is applicable to an industrial standby power supply system.
It can be understood that, the technical scheme that this embodiment provided through when the electric wire netting loses power, control energy storage stand-by power supply as power failure black start power to according to illumination intensity, whether control photovoltaic stand-by power supply is as stand-by power supply, thereby when having realized the electric wire netting loses power, stand-by power supply's steady power supply. The technical scheme that this embodiment provided, on energy storage stand-by power supply is as black start power supply's basis, add photovoltaic power generation, because energy storage stand-by power supply and photovoltaic stand-by power supply's cooperation is used, when the electric wire netting loses the electricity, energy storage stand-by power supply's quick black start energy band moves photovoltaic stand-by power supply and carries the electric energy, photovoltaic stand-by power supply can effectively slow down energy storage stand-by power supply's power consumption simultaneously, supplement each other, make photovoltaic system break away from island protection, make full use of new forms of energy, continuity problem when also solving single energy storage stand-by power supply simultaneously, it is longer to make little electric wire netting steady operation duration, economic benefits is.
It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments.
It should be noted that the terms "first," "second," and the like in the description of the present invention are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Further, in the description of the present invention, the meaning of "a plurality" means at least two unless otherwise specified.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims (10)

1. An industrial backup power system, comprising:
the alternating current output end of the energy storage standby power supply is connected with the line outlet end of the commercial power;
the alternating current output end of the photovoltaic standby power supply is connected with the alternating current output end of the energy storage standby power supply in parallel;
the detection device is used for detecting the illumination intensity of the environment where the photovoltaic standby power supply is located;
and the controller is used for controlling the energy storage standby power supply to serve as a power failure black start power supply when the power grid loses power, and controlling whether the photovoltaic standby power supply serves as a standby power supply or not according to the illumination intensity.
2. The system of claim 1,
and after the alternating current output end of the photovoltaic standby power supply is connected with the alternating current output end of the energy storage standby power supply in parallel, the alternating current output end of the photovoltaic standby power supply is uniformly connected to a power supply bus with a corresponding voltage grade.
3. The system of claim 1,
the energy storage standby power supply comprises: the energy storage converter is connected with the energy storage battery; and/or the presence of a gas in the gas,
the photovoltaic standby power supply comprises: the photovoltaic module and the photovoltaic inverter are connected with the photovoltaic module.
4. A method of controlling an industrial backup power system, comprising:
detecting the illumination intensity of the environment where the photovoltaic standby power supply is located;
when the power grid loses power, the energy storage standby power supply is controlled to be used as a power failure black start power supply, and whether the photovoltaic standby power supply is used as a standby power supply is controlled according to the illumination intensity;
the alternating current output end of the energy storage standby power supply is connected with the line outlet end of the commercial power;
and the alternating current output end of the photovoltaic standby power supply is connected with the alternating current output end of the energy storage standby power supply in parallel.
5. The control method according to claim 4, wherein the controlling whether the photovoltaic backup power source is used as a backup power source comprises:
when the power grid loses power and the illumination intensity meets the starting condition of the photovoltaic standby power supply, controlling the energy storage standby power supply to work as a voltage source, and starting the photovoltaic standby power supply to serve as the standby power supply;
when the power grid loses power and the illumination intensity cannot meet the starting condition of the photovoltaic standby power supply, the energy storage standby power supply is controlled to work independently as a voltage source, and the photovoltaic standby power supply is not started.
6. The control method according to claim 5, wherein the starting photovoltaic backup power supply is used as a backup power supply, and specifically comprises:
and detecting whether the output voltage of the energy storage standby power supply meets the starting condition of the photovoltaic standby power supply, if so, starting the photovoltaic standby power supply, otherwise, not starting the photovoltaic standby power supply.
7. The control method according to claim 6, characterized by further comprising:
and when the output voltage of the energy storage standby power supply does not meet the starting condition of the photovoltaic standby power supply, adjusting the output voltage of the energy storage standby power supply until the output voltage of the energy storage standby power supply meets the starting condition of the photovoltaic standby power supply.
8. The control method according to claim 6, wherein the starting of the photovoltaic backup power supply specifically comprises:
and starting the photovoltaic standby power supply by adopting an automatic reclosing mode.
9. The control method according to claim 6, characterized by further comprising:
after the photovoltaic standby power supply is started, the photovoltaic standby power supply is controlled to be used as a current source to participate in electric energy transmission, and,
and controlling the current of the power grid to be transmitted only by the photovoltaic standby power supply.
10. The control method according to any one of claims 4 to 9, characterized by further comprising:
when the power grid normally supplies power, controlling an energy storage standby power supply to serve as a current source for grid-connected power supply; and/or the presence of a gas in the gas,
and controlling the photovoltaic standby power supply to serve as a current source for grid-connected power supply.
CN202011099446.6A 2020-10-14 2020-10-14 Industrial standby power supply system and control method thereof Pending CN112234705A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11824356B1 (en) * 2022-06-30 2023-11-21 Xi'an Thermal Power Research Institute Co., Ltd. System and method of black start for new power system with energy storage configuration

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11824356B1 (en) * 2022-06-30 2023-11-21 Xi'an Thermal Power Research Institute Co., Ltd. System and method of black start for new power system with energy storage configuration

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