CN116418024A - Off-grid energy management method for photovoltaic inversion energy storage system - Google Patents
Off-grid energy management method for photovoltaic inversion energy storage system Download PDFInfo
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- CN116418024A CN116418024A CN202310320961.XA CN202310320961A CN116418024A CN 116418024 A CN116418024 A CN 116418024A CN 202310320961 A CN202310320961 A CN 202310320961A CN 116418024 A CN116418024 A CN 116418024A
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- 238000004146 energy storage Methods 0.000 title claims abstract description 59
- 238000007726 management method Methods 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 claims abstract description 14
- 238000007599 discharging Methods 0.000 claims abstract description 9
- 230000005611 electricity Effects 0.000 claims description 3
- 238000012840 feeding operation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000010336 energy treatment 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
- H02J3/28—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
- H02J3/381—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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
- H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
Abstract
The invention provides an off-grid energy management method for a photovoltaic inversion energy storage system, which can realize the maximum utilization of photovoltaic energy under the off-grid condition and can enable a load to run rapidly; the method comprises the following steps: s1.1, the energy storage inverter is in an off-grid mode, and when the consumed energy of the load is larger than the photovoltaic energy generated by the photovoltaic PV, the load enters a battery discharging state; s1.2, after the battery charge quantity is discharged to the set minimum charge quantity, closing MPPT control, stopping power output of the energy storage inverter, and charging the battery by the photovoltaic PV; and S1.3, when the battery is charged to the set minimum charge capacity of +3%, starting MPPT control, outputting rated load power by the energy storage inverter, if the consumed load energy is smaller than the photovoltaic energy generated by the photovoltaic PV, charging the battery by redundant energy in the photovoltaic PV, and if the consumed load energy is still larger than the photovoltaic energy generated by the photovoltaic PV, repeating the step S1.1.
Description
Technical Field
The invention relates to the application field of energy management of an energy storage inverter, in particular to a method for processing the emptying time of a battery under the off-grid condition of the energy storage inverter, and particularly relates to an off-grid energy management method for a photovoltaic inverter energy storage system.
Background
The traditional photovoltaic inversion energy storage system does not have an intelligent energy management function, particularly energy treatment when a battery is empty under the off-grid condition, and the existing treatment method is to empty the battery and stop the machine; or the discharging minimum charge amount soc is set, and when the battery is discharged to the set minimum charge amount soc, the machine reports a fault and stops; in other treatment methods, the whole system is stopped, and the whole system enters a photovoltaic to charge a battery after stopping, so that the photovoltaic cannot charge the battery uninterruptedly, and the photovoltaic energy is utilized to the maximum extent; that is, for off-grid conditions, no specific treatment is done for the battery emptying logic, not only is energy wasted, photovoltaic energy is not maximally utilized, but also when the system needs to be re-run, the photovoltaic needs to be re-entered to charge the battery uninterruptedly, and the battery is charged to a large capacity to operate the load, so that the load cannot operate for a long time.
Disclosure of Invention
In order to solve the problems, the invention provides an off-grid energy management method for a photovoltaic inverter energy storage system, which can realize the maximum utilization of photovoltaic energy under the off-grid condition and can enable a load to run rapidly.
The technical scheme is as follows: an off-grid energy management method for a photovoltaic inverter energy storage system, the off-grid energy management method being applied to the photovoltaic inverter energy storage system, the photovoltaic inverter energy storage system comprising a photovoltaic PV, a battery, a load and an energy storage inverter, characterized in that: the method comprises the following steps:
s1.1, the energy storage inverter is in an off-grid mode, and when the consumed energy of the load is larger than the photovoltaic energy generated by the photovoltaic PV, the load enters a battery discharging state;
s1.2, after the battery charge quantity is discharged to the set minimum charge quantity, closing MPPT control, stopping power output of the energy storage inverter, and charging the battery by the photovoltaic PV;
and S1.3, when the battery is charged to the set minimum charge capacity of +3%, starting MPPT control, outputting rated load power by the energy storage inverter, if the consumed load energy is smaller than the photovoltaic energy generated by the photovoltaic PV, charging the battery by redundant energy in the photovoltaic PV, and if the consumed load energy is still larger than the photovoltaic energy generated by the photovoltaic PV, repeating the step S1.1.
Further, when the energy storage inverter is off-grid, the method comprises the following logic steps of over-discharge operation of the battery:
s2.1, starting the photovoltaic inversion energy storage system;
s2.2, the energy storage inverter enters an off-grid;
s2.3, judging whether the battery charge is not more than the minimum charge allowed during off-grid, if so, prohibiting off-grid inversion operation, and performing step S2.4; if not, carrying out the step S2.6;
s2.4, charging the battery by the photovoltaic PV, and continuously charging the battery to the set minimum charge quantity of the battery of +3%;
s2.5, after waiting for more than 90S, adding 1 to the current off-grid failure count;
s2.6, judging whether the current off-grid failure count is not less than 3 times, if yes, charging the battery by the photovoltaic PV, and performing a step S2.7; if not, repeating the step S2.2;
s2.7, judging whether the minimum charge quantity of the battery is larger than the off-grid reconnection charge quantity, if so, clearing off-grid failure count, and allowing off-grid inversion operation; if not, prohibiting off-grid inversion operation;
further, in the step S2.2, after the energy storage inverter enters the off-grid, the method further includes the following steps:
judging whether the battery charge is larger than the minimum battery charge which is allowed when the battery is off-grid or not and a preset hysteresis value, if so, allowing off-grid inversion operation; if not, carrying out the step S2.6;
further, in the step S2.7, after the off-grid inversion operation is prohibited, the method further includes the following steps:
s3.1, judging whether a power grid is on line, and if so, entering a grid-connected state; if not, carrying out the step S3.2;
s3.2, judging whether off-grid inversion operation is allowed or not;
if so, the energy storage inverter enters a off-grid state, the photovoltaic PV generates electricity, if the consumed energy of the load is larger than the photovoltaic energy generated by the photovoltaic PV, the energy storage inverter enters a battery discharging state and discharges to the minimum allowable charge quantity of the battery set by a user, otherwise, the redundant energy in the photovoltaic PV charges the battery;
if not, carrying out the step S3.3;
s3.3, judging whether the photovoltaic PV is on line, if so, generating power by the photovoltaic PV, and charging the battery to the maximum charge capacity of the battery set by a user by the photovoltaic PV; if not, the photovoltaic inversion energy storage system is stopped.
The invention has the beneficial effects that under the off-grid condition, the battery can be discharged to the maximum extent, the power output of the energy storage inverter is stopped when the battery is discharged to the set lower limit of the battery discharge, and meanwhile, the photovoltaic PV is converted into the battery charge until the battery is charged to a certain value, and the energy storage inverter outputs the rated power of the load, thereby realizing the rapid load feeding operation.
Drawings
FIG. 1 is a block diagram of the structure of the present invention;
FIG. 2 is an off-grid energy management flow chart in the present invention;
fig. 3 is a flowchart of off-grid operation in the present invention.
Detailed Description
As shown in fig. 1 to 3, the off-grid energy management method for a photovoltaic inversion energy storage system of the present invention includes a photovoltaic PV, a battery, a load and an energy storage inverter, and the management method can enable the photovoltaic inversion energy storage system to perform off-grid energy conversion, and includes the following steps:
s1.1, an energy storage inverter is in an off-grid mode, and when the consumed energy of a load is larger than the photovoltaic energy generated by the photovoltaic PV, the energy storage inverter enters a battery discharging state;
s1.2, after the charged quantity of the battery is discharged to the set minimum soc, closing MPPT control, stopping power output of the energy storage inverter, and charging the battery by the photovoltaic PV;
and S1.3, when the battery is charged to the set minimum soc+3%, starting MPPT control, outputting rated power of a load by the energy storage inverter, charging the battery by redundant energy in the photovoltaic PV if the consumed energy of the load is smaller than the photovoltaic energy generated by the photovoltaic PV, charging the battery to the set maximum soc of the battery by a user, ending charging the battery by the photovoltaic PV when the battery is charged to the set maximum soc, limiting power by the photovoltaic PV, only supplying power to the load, and repeating the step S1.1 if the consumed energy of the load is still larger than the photovoltaic energy generated by the photovoltaic PV.
When the energy storage inverter is off-grid, the method comprises the following logic steps of over-discharging operation of the battery:
s2.1, starting a photovoltaic inversion energy storage system;
s2.2, the energy storage inverter enters an off-grid;
s2.3, judging whether the battery charge is not more than the minimum charge allowed during off-grid, if so, prohibiting off-grid inversion operation, and performing step S2.4; if not, carrying out the step S2.6;
s2.4, charging the battery by using the photovoltaic PV, and continuously charging the battery to the set minimum charge capacity of +3%;
s2.5, after waiting for more than 90S, adding 1 to the current off-grid failure count;
s2.6, judging whether the current off-grid failure count is not less than 3 times, if yes, charging the battery by the photovoltaic PV, and performing a step S2.7; if not, repeating the step S2.2;
s2.7, judging whether the minimum charge quantity of the battery is larger than the off-grid reconnection charge quantity, if so, clearing off-grid failure count, and allowing off-grid inversion operation, namely, operating step S1.1; if not, the off-grid inversion operation is forbidden.
In step S2.2, after the energy storage inverter enters the off-grid, the method further comprises the following steps:
judging whether the battery charge is larger than the minimum charge of the battery which is allowed when the battery is off-grid or not and a preset hysteresis value, if so, allowing off-grid inversion operation; if not, go to step S2.6.
In step S2.7, after the off-grid inversion operation is prohibited, the method further includes the following steps:
s3.1, judging whether a power grid is on line, and if so, entering a grid-connected state; if not, carrying out the step S3.2;
s3.2, judging whether off-grid inversion operation is allowed or not;
if so, the energy storage inverter enters an off-grid state, the photovoltaic PV generates electricity, if the energy consumption of the load is larger than the photovoltaic energy generated by the photovoltaic PV, the energy storage inverter enters a battery discharging state and discharges to the minimum charge allowed by the battery set by a user, otherwise, the surplus energy in the photovoltaic PV charges the battery, the battery is charged to the maximum battery charge set by the user, and when the maximum battery charge is charged, the photovoltaic PV is ended to charge the battery, the photovoltaic PV limits the power, and only the load is supplied with power;
if not, carrying out the step S3.3;
s3.3, judging whether the photovoltaic PV is on line, if so, generating power by the photovoltaic PV, charging the battery to the maximum battery charge set by a user by the photovoltaic PV, and ending charging the battery by the photovoltaic PV when the battery is charged to the maximum battery charge, wherein the photovoltaic PV limits power and only supplies power to a load; if not, the photovoltaic inversion energy storage system is stopped and does not operate.
By the energy management method, the battery is discharged to the maximum extent under the off-grid condition, and the battery is charged to a certain electric quantity when the load is larger or the photovoltaic PV is weaker, namely, if the load consumes more energy than the photovoltaic energy generated by the photovoltaic PV, the battery is charged to the load, and the battery is discharged until the lower limit of the battery discharge set by a user is reached, and the battery is not discharged deeply at the moment and is required to be charged to a certain electric quantity, and if the situation is continued for a plurality of times; if the load consumes less energy than the photovoltaic energy generated by the photovoltaic PV, the photovoltaic PV is charged with the redundant energy; the photovoltaic inversion energy storage system is not required to be stopped, only the energy storage inverter does not output power, meanwhile, the photovoltaic PV is converted into the battery to be charged, and when the battery is charged to a certain value, the energy storage inverter outputs rated load power, so that the rapid load feeding operation is realized.
In this patent, the minimum soc is the minimum charge amount, and the maximum soc is the maximum charge amount.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (4)
1. An off-grid energy management method for a photovoltaic inverted energy storage system comprising a photovoltaic PV, a battery, a load, and an energy storage inverter, characterized by: the method comprises the following steps:
s1.1, the energy storage inverter is in an off-grid mode, and when the consumed energy of the load is larger than the photovoltaic energy generated by the photovoltaic PV, the load enters a battery discharging state;
s1.2, after the battery charge quantity is discharged to the set minimum charge quantity, closing MPPT control, stopping power output of the energy storage inverter, and charging the battery by the photovoltaic PV;
and S1.3, when the battery is charged to the set minimum charge capacity of +3%, starting MPPT control, outputting rated load power by the energy storage inverter, if the consumed load energy is smaller than the photovoltaic energy generated by the photovoltaic PV, charging the battery by redundant energy in the photovoltaic PV, and if the consumed load energy is still larger than the photovoltaic energy generated by the photovoltaic PV, repeating the step S1.1.
2. An off-grid energy management method for a photovoltaic inverter energy storage system as defined in claim 1, wherein: when the energy storage inverter is off-grid, the battery over-discharge operation logic comprises the following steps:
s2.1, starting the photovoltaic inversion energy storage system;
s2.2, the energy storage inverter enters an off-grid;
s2.3, judging whether the battery charge is not more than the minimum charge allowed during off-grid, if so, prohibiting off-grid inversion operation, and performing step S2.4; if not, carrying out the step S2.6;
s2.4, charging the battery by the photovoltaic PV, and continuously charging the battery to the set minimum charge quantity of the battery of +3%;
s2.5, after waiting for more than 90S, adding 1 to the current off-grid failure count;
s2.6, judging whether the current off-grid failure count is not less than 3 times, if yes, charging the battery by the photovoltaic PV, and performing a step S2.7; if not, repeating the step S2.2;
s2.7, judging whether the minimum charge quantity of the battery is larger than the off-grid reconnection charge quantity, if so, clearing off-grid failure count, and allowing off-grid inversion operation; if not, the off-grid inversion operation is forbidden.
3. An off-grid energy management method for a photovoltaic inverter energy storage system as defined in claim 2, wherein: in the step S2.2, after the energy storage inverter enters the off-grid, the method further includes the following steps:
judging whether the battery charge is larger than the minimum battery charge which is allowed when the battery is off-grid or not and a preset hysteresis value, if so, allowing off-grid inversion operation; if not, go to step S2.6.
4. An off-grid energy management method for a photovoltaic inverter energy storage system as defined in claim 2, wherein: in the step S2.7, after the off-grid inversion operation is prohibited, the method further includes the following steps:
s3.1, judging whether a power grid is on line, and if so, entering a grid-connected state; if not, carrying out the step S3.2;
s3.2, judging whether off-grid inversion operation is allowed or not;
if so, the energy storage inverter enters a off-grid state, the photovoltaic PV generates electricity, if the consumed energy of the load is larger than the photovoltaic energy generated by the photovoltaic PV, the energy storage inverter enters a battery discharging state and discharges to the minimum allowable charge quantity of the battery set by a user, otherwise, the redundant energy in the photovoltaic PV charges the battery;
if not, carrying out the step S3.3;
s3.3, judging whether the photovoltaic PV is on line, if so, generating power by the photovoltaic PV, and charging the battery to the maximum charge capacity of the battery set by a user by the photovoltaic PV; if not, the photovoltaic inversion energy storage system is stopped.
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