CN113193603B - Power distribution method of energy management system and energy management system - Google Patents

Power distribution method of energy management system and energy management system Download PDF

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Publication number
CN113193603B
CN113193603B CN202110601952.9A CN202110601952A CN113193603B CN 113193603 B CN113193603 B CN 113193603B CN 202110601952 A CN202110601952 A CN 202110601952A CN 113193603 B CN113193603 B CN 113193603B
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power
value
energy storage
target
difference value
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CN113193603A (en
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李星
耿后来
徐金城
李阳超
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Sungrow Power Supply Co Ltd
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Sungrow Power Supply Co Ltd
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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
    • 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
    • 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
    • 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
    • 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
    • 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
    • Y02E70/00—Other energy conversion or management systems reducing GHG emissions
    • Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin

Abstract

The invention discloses a power distribution method of an energy management system and the energy management system, which are used for obtaining power parameters of an optical storage grid-connected power generation system at the current moment, calculating the sum of feed network power and total power of energy storage equipment to obtain target total power, and determining target power distributed to each energy storage equipment according to the target total power and power limit values of each energy storage equipment. When power distribution is carried out, the power grid and the energy storage equipment with the functions of providing power and consuming power are taken as controllable objects, the photovoltaic equipment and the load are taken as an uncontrollable object, only the power grid and the energy storage equipment are considered when the power distribution is carried out, and the target power distributed to each energy storage equipment at the next moment is determined based on the sum of the power fed to the power grid at the current moment and the total power of the energy storage equipment, so that the condition of energy flow in a single photovoltaic subsystem is simplified, and reasonable adjustment of energy flow in a grid-connected discovery system of the photovoltaic equipment is realized.

Description

Power distribution method of energy management system and energy management system
Technical Field
The invention relates to the technical field of photo-electricity generation, in particular to a power distribution method of an energy management system and the energy management system.
Background
The optical storage grid-connected power generation system comprises a plurality of optical Chu Zi systems which are connected in parallel, one optical storage subsystem is selected as a host, the rest of the optical storage subsystems are used as slaves, and each optical storage subsystem comprises: photovoltaic devices, energy storage devices (i.e., batteries), and Shan Taiguang store inverters, the photovoltaic devices and energy storage devices being connected via DC/DC converters on the DC bus of the light storage inverter. The Energy Management System (EMS) of the optical storage grid-connected power generation system is integrated in an optical storage subsystem serving as a host, and the energy management system achieves energy flow by acquiring host information, slave information, grid feeding power (namely electric meter power) and the like and issuing power adjustment instructions to the host and the slave through certain logic.
For a single light storage subsystem, a power grid can provide power and consume power, an energy storage device can provide power and consume power, a photovoltaic device can provide power, and a load can consume power, so that energy flows in the single photovoltaic subsystem are various, the light storage grid-connected power generation system comprises a plurality of light Chu Zi systems connected in parallel, the energy flows in the light storage grid-connected power generation system are more complex, unreasonable energy flows easily occur, for example, the photovoltaic device is limited in power when the power cannot be limited, and the energy storage device discharges when the power cannot be discharged.
In summary, how to provide a power distribution method of an energy management system, to reasonably adjust the energy flow in an optical storage grid-connected power generation system, is a technical problem that needs to be solved by those skilled in the art.
Disclosure of Invention
In view of the above, the invention discloses a power distribution method of an energy management system and the energy management system, so as to realize that the energy flow in the optical storage grid-connected power generation system can be reasonably regulated when the management system distributes power.
A method of power distribution for an energy management system, comprising:
acquiring power parameters of the light storage grid-connected power generation system at the current moment, wherein the power parameters at least comprise: the power of the feed network, the power of each energy storage device and the power limit value of each energy storage device;
calculating the sum of the feed network power and the total power of the energy storage equipment to obtain target total power, wherein the total power of the energy storage equipment is the sum of all the energy storage equipment power;
and determining the target power distributed to each energy storage device according to the target total power and the power limit value of each energy storage device.
Optionally, the determining the target power allocated to each energy storage device according to the target total power and each energy storage device power limit value specifically includes:
Obtaining initial power distributed by each energy storage device according to the target total power and the total number of the energy storage devices;
correcting the initial power of each energy storage device according to the power limit value of the energy storage device of each energy storage device to obtain an initial power correction value meeting a preset charge-discharge power condition;
calculating a power difference value of the sum of the target total power and the power correction value of the energy storage device, and recording the power difference value as a first power difference value;
obtaining the total number of target energy storage devices;
and determining the latest target power distributed by each energy storage device based on the first power difference value and the total number of the target energy storage devices.
Optionally, the obtaining the initial power allocated by each energy storage device according to the target total power and the total number of energy storage devices specifically includes:
acquiring the charge states of the energy storage devices;
calculating the average value of the charge states of the energy storage devices;
calculating the initial power allocated by each energy storage device according to the following formula;
P bat_ref [i]＝P res /N+k soc (SOCave-SOCi)；
wherein P is bat_ref [i]For the initial power, i is the number of the optical storage subsystem where each energy storage system is located, P res For the target total power, N is the total number of the energy storage devices, k soc As the SOC equalization coefficient, SOCave is the state-of-charge average value, socave=Σsoci/N, SOCi is the state-of-charge of the energy storage device in the ith optical storage subsystem.
Optionally, the preset charge-discharge power condition is: the initial power correction value is larger than 0 and not larger than the maximum charging power in charging, the initial power correction value is smaller than 0 and not smaller than the maximum discharging power in discharging, and the maximum discharging power is negative.
Optionally, the determining, based on the first power difference value and the total number of the target energy storage devices, the latest target power allocated by each energy storage device specifically includes:
judging whether the total number of the target energy storage devices is 0 and whether the first power difference value is 0;
if the total number of target energy storage devices is not equal to 0 and the first power difference is not equal to 0, determining a power sum of the initial power and a power amplitude value as the latest target power allocated for each of the energy storage devices, the power amplitude value being: and obtaining the quotient of the first power difference value and the total number of the target energy storage devices.
Optionally, the method further comprises: and when the total number of the target energy storage devices is equal to 0 and/or the first power difference value is equal to 0, determining that the operation of power distribution for each energy storage device is finished.
Optionally, the target energy storage devices corresponding to the total number of target energy storage devices are: an energy storage device where the initial power correction value does not reach the maximum charge power, or an energy storage device where the initial power correction value does not reach the maximum discharge power.
Optionally, the method further comprises:
calculating a power difference value between the feed network power and the maximum feed network power limit value, and recording the power difference value as a second power difference value;
and determining the output power limit value distributed to each light storage inverter according to the second power difference value.
Optionally, when the power parameter further includes output power of each light storage inverter, determining an output power limit value allocated to each light storage inverter according to the second power difference value specifically includes:
judging whether the second power difference value is larger than 0;
if so, starting from the optical storage inverter with the maximum output power of the optical storage inverter, and based on the second power difference value, sequentially executing the operation of limiting the output power limit value on all the optical storage inverters until the second power difference value is distributed;
If not, increasing the power amplitude limit value for all the output power limit values of the light storage inverters so as to correct all the output power limit values, wherein the power amplitude limit values are as follows: the absolute value of the second power difference value is the quotient of the total number of the light storage inverters.
Optionally, starting from the optical storage inverter with the maximum output power of the optical storage inverter, based on the second power difference value, sequentially performing an operation of limiting the output power limit value on all the optical storage inverters until the second power difference value is distributed, and specifically includes:
taking the second power difference value as an initial value of a power difference value to be distributed, taking the maximum value of the output power of the light storage inverter as an initial value of an output power value of the light storage inverter to be compared, and judging whether the power difference value to be distributed is larger than the output power value of the light storage inverter to be compared;
if not, determining the difference value of the output power value of the light storage inverter to be compared and the power difference value to be distributed as the output power limit value of the light storage inverter corresponding to the output power value of the light storage inverter to be compared;
if so, determining an output power limit value of the light storage inverter corresponding to the output power value of the light storage inverter to be compared as 0;
Calculating the difference value between the power difference value to be distributed and the output power value of the light storage inverter to be compared, and recording the difference value as a third power difference value;
and taking the third power difference value as the latest power difference value to be distributed, taking the second maximum value of the output power of the light storage inverter as the latest output power value of the light storage inverter to be compared, and then executing the operation of limiting the output power limit value on the light storage inverter corresponding to the latest output power value of the light storage inverter to be compared, and repeating the operation until the power difference value to be distributed is completely distributed.
An energy management system, comprising:
the acquisition unit is used for acquiring power parameters of the optical storage grid-connected power generation system at the current moment, and the power parameters at least comprise: the power of the feed network, the power of each energy storage device and the power limit value of each energy storage device;
the total power calculation unit is used for calculating the sum of the feed network power and the total power of the energy storage equipment to obtain target total power, wherein the total power of the energy storage equipment is the sum of all the energy storage equipment power;
and the power distribution unit is used for determining the target power distributed to each energy storage device according to the target total power and the power limit value of each energy storage device.
Optionally, the power distribution unit specifically includes:
the first power determining subunit is used for obtaining initial power distributed by each energy storage device according to the target total power and the total number of the energy storage devices;
the power correction subunit is used for correcting the initial power of each energy storage device according to the power limit value of the energy storage device of each energy storage device to obtain an initial power correction value meeting the preset charge and discharge power condition;
the power difference calculating subunit is used for calculating the power difference value of the sum of the target total power and the power correction value of the energy storage device and recording the power difference value as a first power difference value;
the equipment quantity acquisition subunit is used for acquiring the total quantity of the target energy storage equipment;
and the latest target power determining subunit is used for determining the latest target power distributed by each energy storage device based on the first power difference value and the total number of the target energy storage devices.
Optionally, the first power determination subunit is specifically configured to:
acquiring the charge states of the energy storage devices;
calculating the average value of the charge states of the energy storage devices;
calculating the initial power allocated by each energy storage device according to the following formula;
P bat_ref [i]＝P res /N+k soc (SOCave-SOCi)；
Wherein P is bat_ref [i]For the initial power, i is the number of the optical storage subsystem where each energy storage system is located, P res For the target total power, N is the total number of the energy storage devices, k soc As the SOC equalization coefficient, SOCave is the state-of-charge average value, socave=Σsoci/N, SOCi is the state-of-charge of the energy storage device in the ith optical storage subsystem.
Optionally, the latest target power determining subunit is specifically configured to:
judging whether the total number of the target energy storage devices is 0 and whether the first power difference value is 0;
if the total number of target energy storage devices is not equal to 0 and the first power difference is not equal to 0, determining a power sum of the initial power and a power amplitude value as the latest target power allocated for each of the energy storage devices, the power amplitude value being: and obtaining the quotient of the first power difference value and the total number of the target energy storage devices.
Optionally, the method further comprises:
the power difference calculating unit is used for calculating the power difference between the feed network power and the maximum feed network power limit value and recording the power difference as a second power difference;
and the power limit value distribution unit is used for determining the output power limit value distributed to each light storage inverter according to the second power difference value.
Optionally, the power limit value distribution unit specifically includes:
a second judging subunit, configured to judge whether the second power difference is greater than 0 when the power parameter further includes output power of each light storage inverter;
a power limit limiting subunit, configured to, when the second determining subunit determines that the second determining subunit is yes, sequentially perform, on the basis of the second power difference, an operation of limiting the output power limit on all the optical storage inverters, from an optical storage inverter that outputs a maximum power value of the optical storage inverter, until the second power difference is distributed;
a power limit correction subunit, configured to increase a power amplitude limit value for all output power limits of the light storage inverters to correct all the output power limits when the second determination subunit determines that the second determination subunit is no, where the power amplitude limit value is: the absolute value of the second power difference value is the quotient of the total number of the light storage inverters.
Optionally, the power limit limiting subunit is specifically configured to:
taking the second power difference value as an initial value of a power difference value to be distributed, taking the maximum value of the output power of the light storage inverter as an initial value of an output power value of the light storage inverter to be compared, and judging whether the power difference value to be distributed is larger than the output power value of the light storage inverter to be compared;
If not, determining the difference value of the output power value of the light storage inverter to be compared and the power difference value to be distributed as the output power limit value of the light storage inverter corresponding to the output power value of the light storage inverter to be compared;
if so, determining an output power limit value of the light storage inverter corresponding to the output power value of the light storage inverter to be compared as 0;
calculating the difference value between the power difference value to be distributed and the output power value of the light storage inverter to be compared, and recording the difference value as a third power difference value;
and taking the third power difference value as the latest power difference value to be distributed, taking the second maximum value of the output power of the light storage inverter as the latest output power value of the light storage inverter to be compared, and then executing the operation of limiting the output power limit value on the light storage inverter corresponding to the latest output power value of the light storage inverter to be compared, and repeating the operation until the power difference value to be distributed is completely distributed.
As can be seen from the above technical solution, the present invention discloses a power distribution method of an energy management system and an energy management system, which acquire a power parameter of an optical storage grid-connected power generation system at a current moment, calculate a sum of a grid-fed power and a total power of energy storage devices to obtain a target total power, and determine a target power distributed to each energy storage device according to the target total power and a power limit value of each energy storage device. When power distribution is carried out, the power grid and the energy storage equipment with the functions of providing power and consuming power are used as controllable objects, the photovoltaic equipment and the load are used as an uncontrollable object, only the power grid and the energy storage equipment are considered when power distribution is carried out, and the target power distributed to each energy storage equipment at the next moment is determined based on the sum of the power fed to the power grid at the current moment and the total power of the energy storage equipment, so that a single photovoltaic subsystem only outputs power according to the maximum capacity or the maximum output power limit value, the condition of energy flow in the single photovoltaic subsystem is simplified, and reasonable adjustment of energy flow in a grid-connected discovery system is realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the disclosed drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method for power distribution in an energy management system according to an embodiment of the present invention;
FIG. 2 is a flowchart of a method for determining a target power to be allocated to each energy storage device according to a target total power and a power limit of each energy storage device according to an embodiment of the present invention;
FIG. 3 is a flow chart of a method of power distribution for another energy management system according to an embodiment of the present invention;
FIG. 4 is a flow chart of a method for determining output power limits assigned to each light storage inverter based on a second power difference in accordance with an embodiment of the present invention;
FIG. 5 is a flowchart of a method for determining output power limits assigned to each light storage inverter based on a second power difference when the second power difference is greater than 0, according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a power distribution system of an energy management system according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a power distribution unit according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of a power distribution system of another energy management system according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The embodiment of the invention discloses a power distribution method of an energy management system and the energy management system, which are used for acquiring power parameters of an optical storage grid-connected power generation system at the current moment, calculating the sum of grid-fed power and total power of energy storage equipment to obtain target total power, and determining target power distributed to each energy storage equipment according to the target total power and the power limit value of each energy storage equipment. When power distribution is carried out, the power grid and the energy storage equipment with the functions of providing power and consuming power are used as controllable objects, the photovoltaic equipment and the load are used as an uncontrollable object, only the power grid and the energy storage equipment are considered when power distribution is carried out, and the target power distributed to each energy storage equipment at the next moment is determined based on the sum of the power fed to the power grid at the current moment and the total power of the energy storage equipment, so that a single photovoltaic subsystem only outputs power according to the maximum capacity or the maximum output power limit value, the condition of energy flow in the single photovoltaic subsystem is simplified, and reasonable adjustment of energy flow in a grid-connected discovery system is realized.
Referring to fig. 1, a flowchart of a power distribution method of an energy management system according to an embodiment of the present invention is disclosed, where the method includes:
step S101, obtaining a power parameter of a light storage grid-connected power generation system at the current moment;
the power parameter in this embodiment is actually a power parameter transferred to the energy management system in the optical storage grid-connected power generation system, where the power parameter at least includes: the power of the feed network, the power of each energy storage device and the power limit value of each energy storage device.
The grid-fed power refers to the power provided and consumed by the grid in the optical storage grid-connected power generation system.
The energy storage device in this embodiment is mainly a photovoltaic cell.
Step S102, calculating the sum of the feed network power and the total power of the energy storage equipment to obtain a target total power;
wherein the total power of the energy storage device is the sum of all the power of the energy storage device.
Suppose that P for feed network power feedin The power of each energy storage device is represented by Pbat [ i ]]I represents the number of the optical storage subsystem where the energy storage device is located, and the total power of the energy storage device is ΣP bat [i]。
Thus, the target total power P res ＝P feedin +ΣP bat [i]。
In addition, in the case of overload, the target total power P res The value of (2) needs to be adjusted accordingly based on the overload condition.
And step S103, determining the target power distributed to each energy storage device according to the target total power and the power limit value of each energy storage device.
Wherein the target power comprises: charge power or discharge power.
In summary, the invention discloses a power distribution method of an energy management system, which is used for obtaining power parameters of an optical storage grid-connected power generation system at the current moment, calculating the sum of the power of a feed network and the total power of energy storage equipment to obtain target total power, and determining the target power distributed to each energy storage equipment according to the target total power and the power limit value of each energy storage equipment. When power distribution is carried out, the power grid and the energy storage equipment with the functions of providing power and consuming power are used as controllable objects, the photovoltaic equipment and the load are used as an uncontrollable object, only the power grid and the energy storage equipment are considered when power distribution is carried out, and the target power distributed to each energy storage equipment at the next moment is determined based on the sum of the power fed to the power grid at the current moment and the total power of the energy storage equipment, so that a single photovoltaic subsystem only outputs power according to the maximum capacity or the maximum output power limit value, the condition of energy flow in the single photovoltaic subsystem is simplified, and reasonable adjustment of energy flow in a grid-connected discovery system is realized.
To further optimize the foregoing embodiments, referring to fig. 2, a flowchart of a method for determining a target power allocated to each energy storage device according to a target total power and a power limit value of each energy storage device according to the embodiment of the present invention is specifically described, that is, step S103 may include:
step S201, obtaining initial power distributed by each energy storage device according to the target total power and the total number of the energy storage devices;
(1) When the SOC (State Of Charge) balance Of the energy storage devices is not considered, the initial power P allocated by each energy storage device bat_ref [i]The expression of (2) is as follows:
P bat_ref [i]＝P res /N；
wherein i represents the number of the optical storage subsystem where the energy storage device is located, P res For a target total power, N is the total number of energy storage devices.
(2) When SOC equalization of the energy storage device is considered, step S201 may specifically include:
A. acquiring the charge states of all the energy storage devices;
B. calculating the average value SOCave=ΣSOCi/N of the charge states of the energy storage devices, wherein SOCi is the charge state of the energy storage device in the ith optical storage subsystem.
C. Calculating the initial power P distributed by each energy storage device according to the following formula bat_ref [i]；
P bat_ref [i]＝P res /N+k soc (SOCave-SOCi)；
Wherein k is soc Is the SOC equalization coefficient.
Therefore, the invention also has a certain SOC balance capability.
Step S202, correcting the initial power of each energy storage device according to the energy storage device power limit value of each energy storage device to obtain an initial power correction value meeting a preset charge-discharge power condition;
Wherein, the preset charge-discharge power conditions are as follows: the initial power correction value is larger than 0 and not larger than the maximum charging power in charging, and is smaller than 0 and not smaller than the maximum discharging power in discharging, and the maximum discharging power is negative.
Because the charge and discharge conditions of each energy storage device are different, after the target total power is evenly distributed to each energy storage device, the initial power distributed by the energy storage device is also required to be corrected according to the power limit value of the energy storage device so as to ensure the normal operation of each energy storage device.
The initial power correction in this embodiment is aimed at: when the energy storage device is charged, 0<P bat_ref_correct [i]≤P lim_c [i]Discharge time-P of energy storage device lim_d [i]≤P bat_ref_correct [i]<0, wherein P lim_c [i]Is the maximum charging power, -P lim_d [i]Is the maximum discharge power and is negative.
In practical applications, to avoid the photovoltaic device of one light storage inverter charging the energy storage device of another light storage inverter, the maximum charging power P of the energy storage device may be defined lim_c [i]≤P pv [i]，P pv [i]Is the real-time power of the photovoltaic device.
Step 203, calculating a power difference value of the sum of the target total power and the power correction value of the energy storage device, and recording the power difference value as a first power difference value;
And the sum of the power correction values of the energy storage devices is the sum of the initial power correction values of all the energy storage devices.
First power difference DeltaP res The expression of (2) is as follows:
ΔP res ＝P res -∑P bat_ref_correct [i]；
wherein P is res For the target total power, Σp bat_ref_correct [i]Is the sum of the power correction values of the energy storage devices.
Step S204, obtaining the total number of the target energy storage devices;
the target energy storage device is: the initial power correction value does not reach the maximum charging power (P res >0), or the initial power correction value does not reach the maximum discharge power (P res <0) energy storage device.
Step S205, determining the latest target power allocated by each energy storage device based on the first power difference and the total number of target energy storage devices.
Step S205 may specifically include:
(1) Judging whether the total number of the target energy storage devices is 0 or not and whether the first power difference value is 0 or not;
(2) If the total number of target energy storage devices is not equal to 0 and the first power difference is not equal to 0, determining a power sum of the initial power and power amplitude values as the latest target power allocated for each of the energy storage devices.
The power amplitude value is: and obtaining the quotient of the first power difference value and the total number of the target energy storage devices.
When the total number of target energy storage devices N1+.0, and the first power difference ΔP res Not equal to 0, indicating that the maximum charge power and maximum discharge power are not achieved by the energy storage device, and at this time, the initial power and power amplitude value ΔP res And determining the latest initial power distributed to each energy storage device at the moment next to the current moment according to the power sum of/N1, and returning to the step S202 to continuously correct the latest initial power again.
(3) And when the total number of the target energy storage devices is equal to 0 and/or the first power difference is equal to 0, determining that the operation of distributing power for each energy storage device is finished.
When DeltaP res =0 and/or n1=0, then it is determined that all energy storage devices have reached a maximum chargeThe electric power and the maximum discharge power, at which time it is determined that the operation of power distribution for the energy storage device is ended.
It should be noted that the invention can also distribute the redundant power among a plurality of light-storage inverters under the condition that the energy of the power-limited-transmission energy-storage device is limited.
Therefore, in order to further optimize the foregoing embodiment, referring to fig. 3, a flowchart of a power distribution method of another energy management system disclosed in the embodiment of the present invention may further include, after step S103, on the basis of the embodiment shown in fig. 1:
Step S104, calculating a power difference value between the feed network power and the maximum feed network power limit value, and recording the power difference value as a second power difference value;
the value of the maximum power limit value of the feed network is determined according to actual needs, and the invention is not limited herein.
Step S105, determining the output power limit value distributed to each light storage inverter according to the second power difference value.
When the second power difference value delta P feedin >When 0, indicating that the feed network power exceeds the maximum feed network power limit value, and reducing the feed network power by limiting the output power of the optical storage inverter; when DeltaP feedin <And 0, indicating that the feed network power does not exceed the maximum feed network power limit value, and recovering the output power limit value of the optical storage inverter.
In summary, the present invention can prevent the grid power from exceeding the maximum grid power limit by adjusting the output power limit of the optical storage inverter based on the power difference between the grid power and the maximum grid power limit.
When the power parameter at the current moment of the optical storage grid-connected power generation system further includes the output power of each optical storage inverter, referring to fig. 4, a method flowchart for determining the output power limit value allocated to each optical storage inverter according to the second power difference value is disclosed in the embodiment of the present invention, and the method includes:
Step S301, judging whether the second power difference is larger than 0, if so, executing step S302, and if not, executing step S303;
step S302, starting from the light storage inverter with the maximum output power of the light storage inverter, and sequentially executing the operation of limiting the output power limit value on all the light storage inverters based on the second power difference value until the second power difference value is distributed;
specifically, referring to the flowchart of the method for determining the output power limit value allocated to each light storage inverter according to the second power difference value when the second power difference value is greater than 0 shown in fig. 5, step S302 may specifically include:
step S401, sorting the current output power of each light storage inverter according to a preset sorting requirement;
wherein each current output power has a corresponding inverter number.
The preset ordering requirement can be in order from big to small or in order from small to big.
Step S402, taking the second power difference value as an initial value of a power difference value to be distributed, taking the maximum value of the output power of the light storage inverter as an initial value of an output power value of the light storage inverter to be compared, judging whether the power difference value to be distributed is larger than the output power value of the light storage inverter to be compared, if not, executing step S403, and if so, executing step S404;
Step S403, determining the difference value between the output power value of the light storage inverter to be compared and the power difference value to be distributed as the output power limit value of the light storage inverter corresponding to the output power value of the light storage inverter to be compared;
step S404, determining an output power limit value of the light storage inverter corresponding to the output power value of the light storage inverter to be compared as 0;
step S405, calculating the difference between the power difference to be distributed and the output power value of the light storage inverter to be compared, and marking the difference as a third power difference;
and step S406, taking the third power difference value as the latest power difference value to be distributed, taking the second maximum value of the output power of the light storage inverter as the latest output power value of the light storage inverter to be compared, returning to step S402, and executing the operation of limiting the output power limit value on the light storage inverter corresponding to the latest output power value of the light storage inverter to be compared, and repeating the steps until the power difference value to be distributed is completely distributed.
The invention stores the output power P of the inverter inv [m]And (3) sequencing from the light storage inverter with the largest output power to execute the operation of limiting the output power limit value of the light storage inverter until the output power limit value of the light storage inverter with the largest output power is 0, if the second power difference value is remained, continuing to execute the operation of limiting the output power limit value of the light storage inverter with the next largest output power, and the like until the third power difference value is distributed. The method is simple and can change the output power limit value of the light storage inverter as little as possible.
For example, assume that the current output power P of each light storage inverter inv [m]Sequencing from big to small to obtain P inv [j[1]]＞P inv [j[2]]…＞P inv [j[k]]…＞P inv [j[M]]，m＝j[k]，j[k]For the inverter number of the corresponding light storage inverter, k is [1, M ]]And (3) representing the current output power positions of the light storage inverters in the sequence, wherein M is the total number of the light storage inverters.
Assume that the current implementation limits the light storage inverter number of the output power limit to m=j [ k ]]The second power difference is delta P feed ；
Determining DeltaP feed ＞P inv [j[k]]If true, then the light storage inverter j [ k ]]Output power limit P of (2) inv_lim [j[k]]＝0，ΔP feed ＝ΔP feed -P inv [j[k]]K=k+1, and when k > M-1, returning to determine Δp again feed ＞P inv [j[k+1]]If this is true, the initial value of k is 1.
When DeltaP feed ＞P inv [j[k]]If not, the light storage inverter j [ k ]]Output power limit P of (2) inv_lim [j[k]]＝P inv [j[k]]-ΔP feed ，n＞k，P inv_lim [j[n]]Is unchanged.
Step S303, adding a power amplitude limit to the output power limits of all the light storage inverters to correct all the output power limits.
The power amplitude limit is: second power difference DeltaP feed The quotient of the absolute value of (2) and the total number of light storage inverters M.
The expression of the output power limit value of each light storage inverter after correction is as follows:
P bat_ref_correct [i]＝P inv_lim [i]+|ΔP feedin |/M；
wherein P is inv_lim [i]To output power limit before correction, |Δp feedin the/M is the power amplitude limit.
Corresponding to the embodiment of the power distribution method, the invention also discloses a power distribution system of the energy management system.
Referring to fig. 6, a schematic structural diagram of a power distribution system of an energy management system according to an embodiment of the present invention is disclosed, the system includes:
the obtaining unit 501 is configured to obtain a power parameter of the optical storage grid-connected power generation system at a current moment, where the power parameter at least includes: the power of the feed network, the power of each energy storage device and the power limit value of each energy storage device;
the grid-fed power refers to the power provided and consumed by the grid in the optical storage grid-connected power generation system.
A total power calculation unit 502, configured to calculate a sum of the feed network power and a total power of the energy storage device to obtain a target total power, where the total power of the energy storage device is the sum of all the energy storage device powers;
a power allocation unit 503, configured to determine the target power allocated to each energy storage device according to the target total power and each energy storage device power limit value, where the target power includes: charge power or discharge power.
In summary, the invention discloses a power distribution system of an energy management system, which is used for acquiring power parameters of an optical storage grid-connected power generation system at the current moment, calculating the sum of the power of a feed network and the total power of energy storage equipment to obtain target total power, and determining the target power distributed to each energy storage equipment according to the target total power and the power limit value of each energy storage equipment. When power distribution is carried out, the power grid and the energy storage equipment with the functions of providing power and consuming power are used as controllable objects, the photovoltaic equipment and the load are used as an uncontrollable object, only the power grid and the energy storage equipment are considered when power distribution is carried out, and the target power distributed to each energy storage equipment at the next moment is determined based on the sum of the power fed to the power grid at the current moment and the total power of the energy storage equipment, so that a single photovoltaic subsystem only outputs power according to the maximum capacity or the maximum output power limit value, the condition of energy flow in the single photovoltaic subsystem is simplified, and reasonable adjustment of energy flow in a grid-connected discovery system is realized.
In order to further optimize the foregoing embodiments, referring to fig. 7, a schematic structural diagram of a power distribution unit according to an embodiment of the present invention is disclosed, where the power distribution unit includes:
a first power determining subunit 601, configured to obtain, according to the target total power and the total number of energy storage devices, an initial power allocated by each energy storage device;
(1) When the SOC (State Of Charge) balance Of the energy storage devices is not considered, the initial power P allocated by each energy storage device bat_ref [i]The expression of (2) is as follows:
P bat_ref [i]＝P res /N；
wherein i represents the number of the optical storage subsystem where the energy storage device is located, P res For a target total power, N is the total number of energy storage devices.
(2) When considering SOC equalization of the energy storage device, the first power determination subunit is specifically configured to:
acquiring the charge states of the energy storage devices;
calculating the average value of the charge states of the energy storage devices;
calculating the initial power allocated by each energy storage device according to the following formula;
P bat_ref [i]＝P res /N+k soc (SOCave-SOCi)；
wherein P is bat_ref [i]Is saidThe initial power i is the number of the optical storage subsystem where each energy storage system is located, P res For the target total power, N is the total number of the energy storage devices, k soc As the SOC equalization coefficient, SOCave is the state-of-charge average value, socave=Σsoci/N, SOCi is the state-of-charge of the energy storage device in the ith optical storage subsystem.
A power correction subunit 602, configured to correct the initial power of each energy storage device according to the energy storage device power limit value of each energy storage device, so as to obtain an initial power correction value that meets a preset charge-discharge power condition;
wherein, the preset charge-discharge power conditions are as follows: the initial power correction value is larger than 0 and not larger than the maximum charging power in charging, and is smaller than 0 and not smaller than the maximum discharging power in discharging, and the maximum discharging power is negative.
Because the charge and discharge conditions of each energy storage device are different, after the target total power is evenly distributed to each energy storage device, the initial power distributed by the energy storage device is also required to be corrected according to the power limit value of the energy storage device so as to ensure the normal operation of each energy storage device.
A power difference calculation subunit 603, configured to calculate a power difference between the target total power and a sum of power correction values of the energy storage device, and record the power difference as a first power difference, where the sum of power correction values of the energy storage device is the sum of all initial power correction values of the energy storage device;
a device number obtaining subunit 604, configured to obtain a total number of target energy storage devices;
The target energy storage device in this embodiment may be: an energy storage device for which the initial power correction value does not reach the maximum charging power, or an energy storage device for which the initial power correction value does not reach the maximum discharging power;
a latest target power determination subunit 605 is configured to determine, based on the first power difference and the total number of target energy storage devices, a latest target power allocated by each of the energy storage devices.
In practical applications, the latest target power determination subunit 605 is specifically configured to:
judging whether the total number of the target energy storage devices is 0 and whether the first power difference value is 0;
if the total number of target energy storage devices is not equal to 0 and the first power difference is not equal to 0, determining a power sum of the initial power and a power amplitude value as the latest target power allocated for each of the energy storage devices, the power amplitude value being: and obtaining the quotient of the first power difference value and the total number of the target energy storage devices.
To further optimize the above embodiments, the latest target power determination subunit 605 may also be configured to:
and when the total number of the target energy storage devices is equal to 0 and/or the first power difference value is equal to 0, determining that the operation of power distribution for each energy storage device is finished.
It should be noted that the invention can also distribute the redundant power among a plurality of light-storage inverters under the condition that the energy of the power-limited-transmission energy-storage device is limited.
Therefore, in order to further optimize the foregoing embodiment, referring to fig. 8, a schematic structural diagram of a power distribution system of another energy management system disclosed in the embodiment of the present invention may further include, based on the embodiment shown in fig. 6:
a power difference calculating unit 504, configured to calculate a power difference between the feed network power and a maximum feed network power limit value, and record the power difference as a second power difference;
a power limit value distribution unit 505, configured to determine an output power limit value distributed to each light storage inverter according to the second power difference value.
When the second power difference value delta P feedin >When 0, indicating that the feed network power exceeds the maximum feed network power limit value, and reducing the feed network power by limiting the output power of the optical storage inverter; when DeltaP feedin <And 0, indicating that the feed network power does not exceed the maximum feed network power limit value, and recovering the output power limit value of the optical storage inverter.
In summary, the present invention can prevent the grid power from exceeding the maximum grid power limit by adjusting the output power limit of the optical storage inverter based on the power difference between the grid power and the maximum grid power limit.
In this embodiment, the power limit value allocation unit 505 specifically may include:
a second judging subunit, configured to judge whether the second power difference is greater than 0 when the power parameter further includes output power of each light storage inverter;
a power limit limiting subunit, configured to, when the second determining subunit determines that the second determining subunit is yes, sequentially perform, on the basis of the second power difference, an operation of limiting the output power limit on all the optical storage inverters, from an optical storage inverter that outputs a maximum power value of the optical storage inverter, until the second power difference is distributed;
a power limit correction subunit, configured to increase a power amplitude limit value for all output power limits of the light storage inverters to correct all the output power limits when the second determination subunit determines that the second determination subunit is no, where the power amplitude limit value is: the absolute value of the second power difference value is the quotient of the total number of the light storage inverters.
To further optimize the above embodiments, the power limit limiting subunit may specifically be configured to:
taking the second power difference value as an initial value of a power difference value to be distributed, taking the maximum value of the output power of the light storage inverter as an initial value of an output power value of the light storage inverter to be compared, and judging whether the power difference value to be distributed is larger than the output power value of the light storage inverter to be compared;
If not, determining the difference value of the output power value of the light storage inverter to be compared and the power difference value to be distributed as the output power limit value of the light storage inverter corresponding to the output power value of the light storage inverter to be compared;
if so, determining an output power limit value of the light storage inverter corresponding to the output power value of the light storage inverter to be compared as 0;
calculating the difference value between the power difference value to be distributed and the output power value of the light storage inverter to be compared, and recording the difference value as a third power difference value;
and taking the third power difference value as the latest power difference value to be distributed, taking the second maximum value of the output power of the light storage inverter as the latest output power value of the light storage inverter to be compared, and then executing the operation of limiting the output power limit value on the light storage inverter corresponding to the latest output power value of the light storage inverter to be compared, and repeating the operation until the power difference value to be distributed is completely distributed.
The specific working principle of each component in the system embodiment is described in the corresponding part of the method embodiment, and is not described herein.
Finally, it is further noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (13)

1. A method of power distribution for an energy management system, comprising:
acquiring power parameters of the light storage grid-connected power generation system at the current moment, wherein the power parameters at least comprise: the power of the feed network, the power of each energy storage device and the power limit value of each energy storage device;
calculating the sum of the feed network power and the total power of the energy storage equipment to obtain target total power, wherein the total power of the energy storage equipment is the sum of all the energy storage equipment power;
Determining the target power distributed to each energy storage device according to the target total power and the power limit value of each energy storage device;
the determining the target power allocated to each energy storage device according to the target total power and each energy storage device power limit value specifically includes:
obtaining initial power distributed by each energy storage device according to the target total power and the total number of the energy storage devices;
correcting the initial power of each energy storage device according to the power limit value of the energy storage device of each energy storage device to obtain an initial power correction value meeting a preset charge-discharge power condition;
calculating a power difference value of the sum of the target total power and the power correction value of the energy storage device, and recording the power difference value as a first power difference value;
obtaining the total number of target energy storage devices;
determining a latest target power allocated by each energy storage device based on the first power difference value and the total number of target energy storage devices;
the determining, based on the first power difference value and the total number of target energy storage devices, the latest target power allocated by each energy storage device specifically includes:
judging whether the total number of the target energy storage devices is 0 and whether the first power difference value is 0;
If the total number of target energy storage devices is not equal to 0 and the first power difference is not equal to 0, determining a power sum of the initial power and a power amplitude value as the latest target power allocated for each of the energy storage devices, the power amplitude value being: and obtaining the quotient of the first power difference value and the total number of the target energy storage devices.
2. The power allocation method according to claim 1, wherein the obtaining the initial power allocated by each energy storage device according to the target total power and the total number of energy storage devices specifically includes:
acquiring the charge states of the energy storage devices;
calculating the average value of the charge states of the energy storage devices;
calculating the initial power allocated by each energy storage device according to the following formula;
P bat_ref [i]＝P res /N+k soc (SOCave-SOCi)；
wherein P is bat_ref [i]For the initial power, i is the number of the optical storage subsystem where each energy storage device is located, P res For the target total power, N is the total number of the energy storage devices, k soc As the SOC equalization coefficient, SOCave is the state-of-charge average value, socave=Σsoci/N, SOCi is the state-of-charge of the energy storage device in the ith optical storage subsystem.
3. The power distribution method according to claim 1, wherein the preset charge-discharge power condition is: the initial power correction value is larger than 0 and not larger than the maximum charging power in charging, and is smaller than 0 and not smaller than the maximum discharging power in discharging, and the maximum discharging power is a negative value.
4. The power distribution method according to claim 1, further comprising: and when the total number of the target energy storage devices is equal to 0 and/or the first power difference value is equal to 0, determining that the operation of power distribution for each energy storage device is finished.
5. The power distribution method according to claim 1, wherein the target energy storage devices corresponding to the total number of target energy storage devices are: an energy storage device where the initial power correction value does not reach the maximum charge power, or an energy storage device where the initial power correction value does not reach the maximum discharge power.
6. The power distribution method according to claim 1, further comprising:
calculating a power difference value between the feed network power and the maximum feed network power limit value, and recording the power difference value as a second power difference value;
and determining the output power limit value distributed to each light storage inverter according to the second power difference value.
7. The power distribution method according to claim 6, wherein when the power parameter further includes output power of each light storage inverter, the determining the output power limit value to be distributed to each light storage inverter according to the second power difference value specifically includes:
Judging whether the second power difference value is larger than 0;
if so, starting from the optical storage inverter with the maximum output power of the optical storage inverter, and based on the second power difference value, sequentially executing the operation of limiting the output power limit value on all the optical storage inverters until the second power difference value is distributed;
if not, increasing the power amplitude limit value for all the output power limit values of the light storage inverters so as to correct all the output power limit values, wherein the power amplitude limit values are as follows: the absolute value of the second power difference value is the quotient of the total number of the light storage inverters.
8. The power distribution method according to claim 7, wherein starting from the optical storage inverter with the maximum output power of the optical storage inverter, based on the second power difference, the operation of limiting the output power limit is sequentially performed on all the optical storage inverters until the second power difference is distributed, and specifically includes:
sequencing the current output power of each light storage inverter according to a preset sequencing requirement, wherein each current output power has a corresponding inverter number;
Taking the second power difference value as an initial value of a power difference value to be distributed, taking the maximum value of the output power of the light storage inverter as an initial value of an output power value of the light storage inverter to be compared, and judging whether the power difference value to be distributed is larger than the output power value of the light storage inverter to be compared;
if not, determining the difference value of the output power value of the light storage inverter to be compared and the power difference value to be distributed as the output power limit value of the light storage inverter corresponding to the output power value of the light storage inverter to be compared;
if so, determining an output power limit value of the light storage inverter corresponding to the output power value of the light storage inverter to be compared as 0;
calculating the difference value between the power difference value to be distributed and the output power value of the light storage inverter to be compared, and recording the difference value as a third power difference value;
and taking the third power difference value as the latest power difference value to be distributed, taking the second maximum value of the output power of the light storage inverter as the latest output power value of the light storage inverter to be compared, and then executing the operation of limiting the output power limit value on the light storage inverter corresponding to the latest output power value of the light storage inverter to be compared, and repeating the operation until the power difference value to be distributed is completely distributed.
9. An energy management system, comprising:
the acquisition unit is used for acquiring power parameters of the optical storage grid-connected power generation system at the current moment, and the power parameters at least comprise: the power of the feed network, the power of each energy storage device and the power limit value of each energy storage device;
the total power calculation unit is used for calculating the sum of the feed network power and the total power of the energy storage equipment to obtain target total power, wherein the total power of the energy storage equipment is the sum of all the energy storage equipment power;
the power distribution unit is used for determining the target power distributed to each energy storage device according to the target total power and the power limit value of each energy storage device;
wherein, the power distribution unit specifically includes:
the first power determining subunit is used for obtaining initial power distributed by each energy storage device according to the target total power and the total number of the energy storage devices;
the power correction subunit is used for correcting the initial power of each energy storage device according to the power limit value of the energy storage device of each energy storage device to obtain an initial power correction value meeting the preset charge and discharge power condition;
the power difference calculating subunit is used for calculating the power difference value of the sum of the target total power and the power correction value of the energy storage device and recording the power difference value as a first power difference value;
The equipment quantity acquisition subunit is used for acquiring the total quantity of the target energy storage equipment;
a latest target power determining subunit, configured to determine, based on the first power difference value and the total number of target energy storage devices, a latest target power allocated by each energy storage device;
the latest target power determination subunit is specifically configured to:
judging whether the total number of the target energy storage devices is 0 and whether the first power difference value is 0;
if the total number of target energy storage devices is not equal to 0 and the first power difference is not equal to 0, determining a power sum of the initial power and a power amplitude value as the latest target power allocated for each of the energy storage devices, the power amplitude value being: and obtaining the quotient of the first power difference value and the total number of the target energy storage devices.
10. The energy management system of claim 9, wherein the first power determination subunit is specifically configured to:
acquiring the charge states of the energy storage devices;
calculating the average value of the charge states of the energy storage devices;
calculating the initial power allocated by each energy storage device according to the following formula;
P bat_ref [i]＝P res /N+k soc (SOCave-SOCi)；
wherein P is bat_ref [i]For the initial power, i is the number of the optical storage subsystem where each energy storage device is located, P res For the target total power, N is the total number of the energy storage devices, k soc As the SOC equalization coefficient, SOCave is the state-of-charge average value, socave=Σsoci/N, SOCi is the state-of-charge of the energy storage device in the ith optical storage subsystem.
11. The energy management system of claim 9, further comprising:
the power difference calculating unit is used for calculating the power difference between the feed network power and the maximum feed network power limit value and recording the power difference as a second power difference;
and the power limit value distribution unit is used for determining the output power limit value distributed to each light storage inverter according to the second power difference value.
12. The energy management system of claim 11, wherein the power limit allocation unit specifically comprises:
a second judging subunit, configured to judge whether the second power difference is greater than 0 when the power parameter further includes output power of each light storage inverter;
a power limit limiting subunit, configured to, when the second determining subunit determines that the second determining subunit is yes, sequentially perform, on the basis of the second power difference, an operation of limiting the output power limit on all the optical storage inverters, from an optical storage inverter that outputs a maximum power value of the optical storage inverter, until the second power difference is distributed;
A power limit correction subunit, configured to increase a power amplitude limit value for all output power limits of the light storage inverters to correct all the output power limits when the second determination subunit determines that the second determination subunit is no, where the power amplitude limit value is: the absolute value of the second power difference value is the quotient of the total number of the light storage inverters.
13. The energy management system of claim 12, wherein the power limit limiting subunit is specifically configured to:
taking the second power difference value as an initial value of a power difference value to be distributed, taking the maximum value of the output power of the light storage inverter as an initial value of an output power value of the light storage inverter to be compared, and judging whether the power difference value to be distributed is larger than the output power value of the light storage inverter to be compared;
if not, determining the difference value of the output power value of the light storage inverter to be compared and the power difference value to be distributed as the output power limit value of the light storage inverter corresponding to the output power value of the light storage inverter to be compared;
if so, determining an output power limit value of the light storage inverter corresponding to the output power value of the light storage inverter to be compared as 0;
Calculating the difference value between the power difference value to be distributed and the output power value of the light storage inverter to be compared, and recording the difference value as a third power difference value;
and taking the third power difference value as the latest power difference value to be distributed, taking the second maximum value of the output power of the light storage inverter as the latest output power value of the light storage inverter to be compared, and then executing the operation of limiting the output power limit value on the light storage inverter corresponding to the latest output power value of the light storage inverter to be compared, and repeating the operation until the power difference value to be distributed is completely distributed.
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