CN112803475A - Parallel operation control system and method for household energy storage inverter - Google Patents
Parallel operation control system and method for household energy storage inverter Download PDFInfo
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- 238000004146 energy storage Methods 0.000 title claims abstract description 174
- 238000000034 method Methods 0.000 title claims abstract description 39
- 230000000694 effects Effects 0.000 abstract description 9
- 238000010248 power generation Methods 0.000 description 16
- 238000010586 diagram Methods 0.000 description 4
- 230000005611 electricity Effects 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00004—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by the power network being locally controlled
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
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- 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
- H02J2310/00—The network for supplying or distributing electric power characterised by its spatial reach or by the load
- H02J2310/10—The network having a local or delimited stationary reach
- H02J2310/12—The local stationary network supplying a household or a building
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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
- Y02B10/10—Photovoltaic [PV]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02B90/20—Smart grids as enabling technology in buildings sector
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/70—Smart grids as climate change mitigation technology in the energy generation sector
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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
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/12—Monitoring or controlling equipment for energy generation units, e.g. distributed energy generation [DER] or load-side generation
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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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- 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
- Y04S20/20—End-user application control systems
- Y04S20/242—Home appliances
Abstract
The embodiment of the invention discloses a parallel operation control system and a parallel operation control method for a household energy storage inverter, wherein the system is connected with a user side load and a commercial power grid, and comprises the following steps: the power supply device comprises a plurality of energy storage inverters connected in parallel and used for selectively supplying power to the user side load according to a power distribution strategy; the first control bus is connected with the power supply device and is used for carrying out current-sharing parallel operation on the plurality of energy storage inverters connected in parallel; and the second control bus is connected with the power supply device and used for generating a control command to control the plurality of energy storage inverters connected in parallel according to the power distribution strategy. According to the parallel operation control system of the household energy storage inverters, which is provided by the embodiment of the invention, the plurality of energy storage inverters are subjected to current sharing and parallel connection through the first control bus and the second control bus, so that the problem that the plurality of energy storage inverters cannot be installed at the same time in the prior art is solved, and the effect of flexibly configuring the required parallel operation number according to the household load conditions of different users is realized.
Description
Technical Field
The embodiment of the invention relates to an energy storage technology, in particular to a parallel operation control system and method for a household energy storage inverter.
Background
With the development of new energy in recent years, photovoltaic systems are more and more introduced into the scenes of household users. Especially in areas with good illumination, photovoltaic power generation brings real benefits to people. However, in daytime, the photovoltaic power can generate power, and when the sun falls on a mountain, the solar energy cannot be used continuously. Meanwhile, with the development of energy storage systems for users, the problem is solved. The household energy storage system can be matched with a photovoltaic system, the battery is charged by the energy storage inverter in the daytime to store redundant solar energy, and the electricity of the battery pack is released by the energy storage inverter at night to be used by the household of the user.
The solar energy storage problem can be solved by the scheme, but because the load capacity of each house is different, the number of the energy storage inverters to be installed is also different according to the load condition.
Disclosure of Invention
The invention provides a parallel operation control system and method for a household energy storage inverter, which aim to realize the effect of flexibly configuring the number of parallel operation units according to the household load conditions of different users.
In a first aspect, an embodiment of the present invention provides a parallel operation control system for a household energy storage inverter, which is connected to a user side load and a utility power grid, and includes:
the power supply device comprises a plurality of energy storage inverters connected in parallel and used for selectively supplying power to user side loads according to a power distribution strategy;
the first control bus is connected with the power supply device and is used for carrying out current-sharing parallel operation on the plurality of energy storage inverters connected in parallel;
and the second control bus is connected with the power supply device and used for generating a control command to control the plurality of energy storage inverters connected in parallel according to the power distribution strategy.
Optionally, the power supply device further includes: photovoltaic device and controlling means.
Optionally, the photovoltaic device is configured to convert solar energy into first electric energy, provide the first electric energy to the control device, and selectively allocate the first electric energy according to the power distribution policy.
Optionally, the control device is configured to detect operating conditions of the photovoltaic device and the plurality of energy storage inverters connected in parallel, and selectively supply power to a user-side load according to the power distribution policy.
Optionally, the power distribution strategy includes an off-grid mode and a grid-connected mode.
In a second aspect, an embodiment of the present invention further provides a parallel operation control method for a user energy storage inverter, where the method includes:
acquiring the number of energy storage inverters needing to be connected in parallel in a power supply device;
designing a first control bus according to the number of the energy storage inverters to perform current sharing and parallel operation on the plurality of energy storage inverters;
and designing a second control bus according to the number of the energy storage inverters to generate a control command to control the plurality of energy storage inverters connected in parallel to work.
Optionally, the method further includes:
and judging the working mode of the power supply device, wherein the working mode comprises an off-grid mode and a grid-connected mode.
Optionally, when the operating mode is an off-grid mode, the method further includes:
acquiring current sharing information of each energy storage inverter and calculating average active current and reactive current;
calculating a current sharing error according to the average active current and the average reactive current;
and controlling and adjusting active errors and reactive errors according to the current sharing errors.
Optionally, when the operating mode is an off-grid mode, the method further includes:
selecting one energy storage inverter of the plurality of energy storage inverters as a host and the other remaining energy storage inverters as slaves according to a preset rule;
calculating the phase difference of each slave machine according to the master machine and the plurality of slave machines;
and controlling the plurality of slave machines to adjust the delay error according to the phase difference of each slave machine.
Optionally, when the working mode is a grid-connected mode, the method further includes:
acquiring grid-connected active power and reactive power of each energy storage inverter;
and performing active target value giving and reactive scheduling giving on each energy storage inverter according to the grid-connected active power and reactive power.
The embodiment of the invention discloses a parallel operation control system and a parallel operation control method for a household energy storage inverter, wherein the system is connected with a user side load and a commercial power grid, and comprises the following steps: the power supply device comprises a plurality of energy storage inverters connected in parallel and used for selectively supplying power to the user side load according to a power distribution strategy; the first control bus is connected with the power supply device and is used for carrying out current-sharing parallel operation on the plurality of energy storage inverters connected in parallel; and the second control bus is connected with the power supply device and used for generating a control command to control the plurality of energy storage inverters connected in parallel according to the power distribution strategy. According to the parallel operation control system of the household energy storage inverters, which is provided by the embodiment of the invention, the plurality of energy storage inverters are subjected to current sharing and parallel connection through the first control bus and the second control bus, so that the problem that the plurality of energy storage inverters cannot be installed at the same time in the prior art is solved, and the effect of flexibly configuring the required parallel operation number according to the household load conditions of different users is realized.
Drawings
Fig. 1 is a schematic diagram of module connection of a parallel operation control system of a household energy storage inverter according to an embodiment of the present invention;
fig. 2 is a schematic diagram of module connection of a parallel operation control system of a household energy storage inverter according to a second embodiment of the present invention;
fig. 3 is a schematic flow chart of a parallel operation control method for a household energy storage inverter according to a third embodiment of the present invention;
fig. 4 is a schematic flow chart of a parallel operation control method for a user energy storage inverter according to a fourth embodiment of the present invention;
fig. 5 is a schematic flow chart of another parallel operation control method for a user using an energy storage inverter according to a fourth embodiment of the present invention;
fig. 6 is a schematic flow chart of another parallel operation control method for a user energy storage inverter according to a fourth embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Before discussing exemplary embodiments in more detail, it should be noted that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although a flowchart may describe the steps as a sequential process, many of the steps can be performed in parallel, concurrently or simultaneously. In addition, the order of the steps may be rearranged. A process may be terminated when its operations are completed, but may have additional steps not included in the figure. A process may correspond to a method, a function, a procedure, a subroutine, a subprogram, etc.
Furthermore, the terms "first," "second," and the like may be used herein to describe various orientations, actions, steps, elements, or the like, but the orientations, actions, steps, or elements are not limited by these terms. These terms are only used to distinguish one direction, action, step or element from another direction, action, step or element. For example, the first audio may be referred to as the second audio, and similarly, the second audio may be referred to as the first audio, without departing from the scope of the present application. The first audio and the second audio are both audio, but they are not the same audio. The terms "first", "second", etc. are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
Example one
Fig. 1 is a schematic diagram of module connection of a parallel operation control system of a household energy storage inverter according to an embodiment of the present invention, where the parallel operation control system of the household energy storage inverter according to the present embodiment is connected to a user side load 4 and a utility grid 5, and the parallel operation control system of the household energy storage inverter according to the embodiment of the present invention includes: a power supply device 1, a first control bus 2 and a second control bus 3.
The power supply device 1 comprises a plurality of energy storage inverters connected in parallel and used for selectively supplying power to the user side load 4 according to the power distribution strategy.
In this embodiment, the power supply device 1 may include various power generation and control devices for providing normal operating power to the user side load 3. Illustratively, the power supply device 1 may include a photovoltaic power generation system, an energy storage battery system, a general control system, and the like, the photovoltaic power generation system refers to a power generation system that directly converts light energy into electric energy without a thermal process, and the main components include a solar battery, a storage battery, a controller, and an inverter, and are characterized by high reliability, long service life, no environmental pollution, independent power generation, and grid-connected operation. The energy storage battery system is a storage battery for storing energy for solar power generation equipment, wind power generation equipment and renewable energy, and can supply power to the user side load 4 through repeated charging and discharging processes. The energy storage battery system comprises a plurality of energy storage inverters connected in parallel, the effect of flexibly configuring the number of the parallel machines required according to the family load conditions of different users is achieved through the plurality of energy storage inverters connected in parallel, in the embodiment, the number of the specific inverters connected in parallel can be adjusted adaptively according to the user requirements, limitation is not required in the embodiment, and at most 15 energy storage inverters can be connected generally. The master control system monitors and allocates a power supply mode, illustratively, when the commercial power grid 5 normally works, the commercial power grid 5 preferentially supplies power to the user side load 4, when the commercial power grid 5 fails, the photovoltaic power generation system and the energy storage battery system supply power to the user side load 4, and under a normal condition, the commercial power grid 5 and the photovoltaic power generation system can charge the energy storage battery to keep the full-power state of the energy storage battery.
In this embodiment, the power distribution strategy includes an off-grid mode and a grid-connected mode, and in the off-grid mode, the utility power grid 5 stops supplying power to the user side load, and at this time, the power supply device 1 supplies power to the user side load 4 by means of a photovoltaic or an energy storage battery, and disconnects the power supply device 1 from the utility power grid 5, thereby avoiding system damage caused by connecting the power supply device under the condition that the utility power grid 5 is not completely disconnected. In the grid-connected mode, the utility power grid 5 normally supplies power to the user side load 4, and simultaneously charges the energy storage battery, so that the energy storage battery is kept in a high-voltage state.
And the first control bus 2 is connected with the power supply device 1 and is used for carrying out current-sharing parallel operation on the plurality of energy storage inverters connected in parallel.
In this embodiment, the first control bus 2 is mainly used to equalize and parallel the energy storage inverters, and when all the energy storage inverters are in a parallel state, the voltages are the same, and at this time, the current generated by each energy storage inverter needs to be adaptively adjusted, so as to ensure that the current of each energy storage inverter remains the same.
And the second control bus 3 is connected with the power supply device 1 and is used for generating a control command to control the plurality of energy storage inverters connected in parallel according to the power distribution strategy.
In this embodiment, the second control bus 3 is mainly used for calculating the power of the power grid, calculating the power of the photovoltaic power generation, and generating a control command to schedule other devices according to the power distribution strategy.
The embodiment of the invention discloses a parallel operation control system of a household energy storage inverter, which is connected with a user side load and a commercial power grid and comprises the following components: the power supply device comprises a plurality of energy storage inverters connected in parallel and used for selectively supplying power to the user side load according to a power distribution strategy; the first control bus is connected with the power supply device and is used for carrying out current-sharing parallel operation on the plurality of energy storage inverters connected in parallel; and the second control bus is connected with the power supply device and used for generating a control command to control the plurality of energy storage inverters connected in parallel according to the power distribution strategy. According to the parallel operation control system of the household energy storage inverters, which is provided by the embodiment of the invention, the plurality of energy storage inverters are subjected to current sharing and parallel connection through the first control bus and the second control bus, so that the problem that the plurality of energy storage inverters cannot be installed at the same time in the prior art is solved, and the effect of flexibly configuring the required parallel operation number according to the household load conditions of different users is realized.
Example two
Fig. 2 is a schematic diagram of module connection of two household energy storage inverter parallel control systems according to an embodiment of the present invention, where a household energy storage inverter parallel control system according to the present embodiment is connected to a user side load 4 and a utility grid 5, and a household energy storage inverter parallel control system according to an embodiment of the present invention includes: a power supply device 1, a first control bus 2 and a second control bus 3.
The power supply device 1 comprises a plurality of energy storage inverters 11 connected in parallel for selectively supplying power to the customer premises loads 4 according to a power distribution strategy. The power supply device further includes: a photovoltaic device 12 and a control device 13.
In the present embodiment, the photovoltaic device 12 is configured to convert solar energy into first electrical energy, provide the first electrical energy to the control device 13, and selectively deploy the first electrical energy according to the power distribution strategy. The photovoltaic device 12 includes a photovoltaic power generation system and an inverter, which are controlled by the control device 13 to supply power, and when supplying power, the photovoltaic power generation system and the inverter supply power to the control device 13.
The control device 13 is configured to detect operating conditions of the photovoltaic device 12 and the plurality of energy storage inverters 11 connected in parallel, and selectively supply power to the customer premises loads 4 according to the power distribution strategy.
In the present embodiment, the control device 13 includes a distribution switch and system control, an electricity meter, and a mutual inductance sensor, and controls the power supply state through a plurality of switches. The distribution switch and the system control are compatible with an alternating current power grid and a generator interface, and the distribution switch and the system control are switched through the relay switch. The user of the ammeter and the mutual inductance sensor detects the generated voltages generated by different devices. The control device 13 controls each energy storage inverter 11 through the second control bus 3, so that it is ensured that the power supply current of each energy storage inverter 11 is the same, and the operation is normal.
And the first control bus 2 is connected with the power supply device 1 and is used for carrying out current-sharing parallel operation on the plurality of energy storage inverters connected in parallel.
And the second control bus 3 is connected with the power supply device 1 and is used for generating a control command to control the plurality of energy storage inverters connected in parallel according to the power distribution strategy.
The embodiment of the invention discloses a parallel operation control system of a household energy storage inverter, which is connected with a user side load and a commercial power grid and comprises the following components: the power supply device comprises a plurality of energy storage inverters connected in parallel and used for selectively supplying power to the user side load according to a power distribution strategy; the first control bus is connected with the power supply device and is used for carrying out current-sharing parallel operation on the plurality of energy storage inverters connected in parallel; and the second control bus is connected with the power supply device and used for generating a control command to control the plurality of energy storage inverters connected in parallel according to the power distribution strategy. According to the parallel operation control system of the household energy storage inverters, which is provided by the embodiment of the invention, the plurality of energy storage inverters are subjected to current sharing and parallel connection through the first control bus and the second control bus, so that the problem that the plurality of energy storage inverters cannot be installed at the same time in the prior art is solved, and the effect of flexibly configuring the required parallel operation number according to the household load conditions of different users is realized.
EXAMPLE III
Fig. 3 is a schematic flow chart of a parallel operation control method for a user energy storage inverter according to a third embodiment of the present invention, where the parallel operation control method for the user energy storage inverter according to the third embodiment of the present invention is suitable for controlling a plurality of energy storage inverters connected in parallel, and includes:
and step 100, acquiring the number of energy storage inverters needing to be connected in parallel in the power supply device.
In this embodiment, the number of the specific parallel inverters can be adaptively adjusted according to the requirement of the user, for example, the number of the energy storage inverters can be selected as small as the number of the electric appliances in a general household is small, and the number of the energy storage inverters can be selected as large as the number of the energy storage inverters in a small-sized factory. In this embodiment, the present invention is not limited thereto, and generally, a maximum of 15 storage inverters may be connected. In this embodiment, the power supply device may include various power generation and control devices for providing normal operating power to the user side load, which illustratively includes a photovoltaic power generation device, an energy storage device, a control device, and the like.
And 110, designing a first control bus according to the number of the energy storage inverters to perform current sharing and parallel operation on the plurality of energy storage inverters.
In this embodiment, the first control bus is designed according to the number of the inverters, and is mainly used for performing current equalization and parallel operation on the energy storage inverters, when all the energy storage inverters are in a parallel state, the voltage is the same, and at this time, the current generated by each energy storage inverter needs to be adaptively adjusted, so that the current of each energy storage inverter is ensured to be the same.
And 120, designing a second control bus according to the number of the energy storage inverters to generate a control command to control the plurality of energy storage inverters connected in parallel to work.
In the embodiment, a second control bus is designed according to the number of the inverters, and the second control bus is mainly used for calculating power of a power grid, calculating photovoltaic power generation power and generating a control command to schedule other equipment according to a power distribution strategy.
The embodiment of the invention discloses a parallel operation control method for a household energy storage inverter, which comprises the following steps: acquiring the number of energy storage inverters needing to be connected in parallel in a power supply device; designing a first control bus according to the number of the energy storage inverters to perform current sharing and parallel operation on the plurality of energy storage inverters; and designing a second control bus according to the number of the energy storage inverters to generate a control command to control the plurality of energy storage inverters connected in parallel to work. According to the parallel operation control system of the household energy storage inverters, which is provided by the embodiment of the invention, the plurality of energy storage inverters are subjected to current sharing and parallel connection through the first control bus and the second control bus, so that the problem that the plurality of energy storage inverters cannot be installed at the same time in the prior art is solved, and the effect of flexibly configuring the required parallel operation number according to the household load conditions of different users is realized.
Example four
Fig. 4 is a schematic flow chart of a parallel operation control method for a user energy storage inverter according to a fourth embodiment of the present invention, where the parallel operation control method for the user energy storage inverter according to the fourth embodiment of the present invention is suitable for controlling a plurality of energy storage inverters connected in parallel, and includes:
and 200, acquiring the number of energy storage inverters needing to be connected in parallel in the power supply device.
And 210, designing a first control bus according to the number of the energy storage inverters to perform current sharing and parallel operation on the plurality of energy storage inverters.
And step 220, designing a second control bus according to the number of the energy storage inverters to generate a control command to control the plurality of energy storage inverters connected in parallel to work.
And 230, judging the working modes of the power supply device, wherein the working modes comprise an off-grid mode and a grid-connected mode.
In this embodiment, the off-grid mode refers to the disconnection of the utility grid from the power supply device, and at this time, the utility grid will be completely disconnected from the user-side load, and the power supply device directly provides electric energy to the user-side load. The grid-connected mode refers to the normal connection between the utility grid and the power supply device, and the voltage consumed by the general user side load is provided by the utility grid.
In this embodiment, as shown in fig. 5, when the operating mode is the off-grid mode, step 230 further includes:
and 231, obtaining current sharing information of each energy storage inverter and calculating average active current and reactive current.
In this embodiment, the topology of the whole device is a SPLIT system, the off-network control loop adopts independent control based on three loops of current-sharing voltage and current, current-sharing information of the device is broadcast to the first control bus, current-sharing information on the current-sharing bus is received by the current device, an average value is calculated and used as a given value, the current-sharing information is compared with current-sharing information of the current device, and the current-sharing information is subjected to PI calculation to obtain current-sharing loop output which is used for adjusting and outputting the current-sharing loop given value and the.
And step 232, calculating a current sharing error according to the average active current and the average reactive current.
In this embodiment, in the off-grid mode, the energy storage inverter operates in the voltage source mode, and the machine loop is composed of a current-sharing loop, a voltage loop and a current loop. The current sharing ring uploads the current sharing information of each inverter to a first control bus, receives the current sharing information of other energy storage inverters, calculates the average active current and reactive current, and calculates the current sharing error according to the active current and reactive current of each inverter.
And 233, adjusting active errors and reactive errors according to the current sharing error control.
In the embodiment, the active error and the reactive error are controlled through the current-sharing error, so that the voltage amplitude and the frequency are adjusted, and the effect of current sharing and parallel connection of all the energy storage inverters is achieved.
And 234, selecting one energy storage inverter of the plurality of energy storage inverters as a master and the other remaining energy storage inverters as slaves according to a preset rule.
In this embodiment, the preset rule is a bus information competition rule, and generally, the energy storage inverters that normally operate and meet the bus information competition rule can all be synchronous hosts.
And 235, calculating the phase difference of each slave according to the master and the plurality of slaves.
In this embodiment, the master sends phase and frequency information through the first control bus, and the slave receives the phase and period information sent by the master for progressive tracking. The master machine tracks the phase and the period of the commercial power, generates a system public phase time edge and a public phase locking period, and sends the system public phase time edge and the public phase locking period to the slave machine through the first control bus, and generates a sending delay Delta _ T1 on the first control bus, after the slave machine receives a synchronous information frame sent by the master machine, a receiving delay Delta _ T2 is generated at the same time, and the sum of the two is the total delay, so that the phase difference between the slave machine and the master machine is obtained: delta _ Phase equals Delta _ T1+ Delta _ T2.
And step 236, controlling the plurality of slave machines to adjust the delay error according to the phase difference of each slave machine.
In this embodiment, the delay error of each slave is adjusted according to the calculated phase difference, so as to ensure that each energy storage inverter maintains the same phase state.
In this embodiment, as shown in fig. 6, when the operating mode is the grid-connected mode, step 230 further includes:
and 237, acquiring grid-connected active power and reactive power of each energy storage inverter.
In this embodiment, all the energy storage inverters receive the grid-connected active power and reactive power information sent by the control device from the second control bus. In a parallel machine state, active inductance current information and reactive inductance current information are accumulated once every 4ms, the active inductance current information and the reactive inductance current information are triggered and sent after accumulation is completed, the active inductance current information and the reactive inductance current information are sent in a 1ms task, sending time of 128us 15-1.92 ms is needed when the energy storage inverter devices are connected in parallel and the second control bus operates at the rate of 1Mbits, then data receiving is achieved in the 1ms task, and the data receiving is updated once every 4ms and used for calculation and control.
And 238, performing active target value giving and reactive scheduling giving on each energy storage inverter according to the grid-connected active power and reactive power.
In this embodiment, all the energy storage inverters receive the grid-connected active power and reactive power information sent by the control device from the second control bus, and the grid-connected active power and reactive power information is used as an active target value giving and a reactive scheduling giving.
The embodiment of the invention discloses a parallel operation control method for a household energy storage inverter, which comprises the following steps: acquiring the number of energy storage inverters needing to be connected in parallel in a power supply device; designing a first control bus according to the number of the energy storage inverters to perform current sharing and parallel operation on the plurality of energy storage inverters; and designing a second control bus according to the number of the energy storage inverters to generate a control command to control the plurality of energy storage inverters connected in parallel to work. According to the parallel operation control system of the household energy storage inverters, which is provided by the embodiment of the invention, the plurality of energy storage inverters are subjected to current sharing and parallel connection through the first control bus and the second control bus, so that the problem that the plurality of energy storage inverters cannot be installed at the same time in the prior art is solved, and the effect of flexibly configuring the required parallel operation number according to the household load conditions of different users is realized.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. The utility model provides a family is with energy storage inverter parallel operation control system, is connected with user side load and commercial power electric wire netting, its characterized in that includes:
the power supply device comprises a plurality of energy storage inverters connected in parallel and used for selectively supplying power to user side loads according to a power distribution strategy;
the first control bus is connected with the power supply device and is used for carrying out current-sharing parallel operation on the plurality of energy storage inverters connected in parallel;
and the second control bus is connected with the power supply device and used for generating a control command to control the plurality of energy storage inverters connected in parallel according to the power distribution strategy.
2. The parallel operation control system for the household energy storage inverter according to claim 1, wherein the power supply device further comprises: photovoltaic device and controlling means.
3. The parallel operation control system for the household energy storage inverter as claimed in claim 2, wherein the photovoltaic device is configured to convert solar energy into first electric energy, provide the first electric energy to the control device, and perform selective deployment according to the power distribution strategy.
4. The parallel operation control system for the household energy storage inverters as claimed in claim 2, wherein the control device is configured to detect the operating conditions of the photovoltaic device and the plurality of parallel energy storage inverters and selectively supply power to the load at the user terminal according to the power distribution strategy.
5. The parallel operation control system for the household energy storage inverters as claimed in claim 1, wherein the power distribution strategy comprises an off-grid mode and a grid-connected mode.
6. A parallel operation control method for a household energy storage inverter is characterized by comprising the following steps:
acquiring the number of energy storage inverters needing to be connected in parallel in a power supply device;
designing a first control bus according to the number of the energy storage inverters to perform current sharing and parallel operation on the plurality of energy storage inverters;
and designing a second control bus according to the number of the energy storage inverters to generate a control command to control the plurality of energy storage inverters connected in parallel to work.
7. The parallel operation control method for the household energy storage inverters according to claim 6, further comprising:
and judging the working mode of the power supply device, wherein the working mode comprises an off-grid mode and a grid-connected mode.
8. The parallel operation control method for the household energy storage inverter according to claim 7, wherein when the operation mode is an off-grid mode, the parallel operation control method further comprises:
acquiring current sharing information of each energy storage inverter and calculating average active current and reactive current;
calculating a current sharing error according to the average active current and the average reactive current;
and controlling and adjusting active errors and reactive errors according to the current sharing errors.
9. The parallel operation control method for the household energy storage inverter according to claim 7, wherein when the operation mode is an off-grid mode, the parallel operation control method further comprises:
selecting one energy storage inverter of the plurality of energy storage inverters as a host and the other remaining energy storage inverters as slaves according to a preset rule;
calculating the phase difference of each slave machine according to the master machine and the plurality of slave machines;
and controlling the plurality of slave machines to adjust the delay error according to the phase difference of each slave machine.
10. The parallel operation control method for the household energy storage inverter according to claim 7, wherein when the working mode is a parallel operation mode, the parallel operation control method further comprises:
acquiring grid-connected active power and reactive power of each energy storage inverter;
and performing active target value giving and reactive scheduling giving on each energy storage inverter according to the grid-connected active power and reactive power.
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