CN113193603A - 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
CN113193603A
CN113193603A CN202110601952.9A CN202110601952A CN113193603A CN 113193603 A CN113193603 A CN 113193603A CN 202110601952 A CN202110601952 A CN 202110601952A CN 113193603 A CN113193603 A CN 113193603A
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power
energy storage
value
difference value
target
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CN113193603B (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

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

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 the power of a feed network and the total power of energy storage equipment to obtain a 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. According to the invention, when power distribution is carried out, the power grid and the energy storage equipment which have the functions of providing power and consuming power are used as controllable objects, the photovoltaic equipment and the load are used as uncontrollable objects, 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 current moment grid feeding power 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 the energy flow in the light storage grid connection discovery system is realized.

Description

Power distribution method of energy management system and energy management system
Technical Field
The invention relates to the technical field of light storage power generation, in particular to a power distribution method of an energy management system and the energy management system.
Background
The grid-connected light storage power generation system comprises a plurality of light storage subsystems connected in parallel, one light storage subsystem is selected as a host, the rest light storage subsystems are used as slaves, and each light storage subsystem comprises: the photovoltaic device, the energy storage device (namely a battery) and a single light storage inverter are connected through a DC/DC converter on a direct current bus of the light storage inverter. An 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 transmits power regulation instructions to the host and the slave through certain logic by acquiring host information, slave information, feed network power (namely electric meter power) and the like to realize energy flow.
For a single photovoltaic subsystem, a power grid can provide power and can consume power, an energy storage device can provide power and can consume power, a photovoltaic device can provide power and a load can consume power, so that energy flows in the single photovoltaic subsystem have various conditions, and the photovoltaic grid-connected power generation system comprises a plurality of photovoltaic subsystems connected in parallel, so that the energy flows in the photovoltaic grid-connected power generation system are more complicated, and the condition that the energy flows unreasonably is easily caused, for example, the photovoltaic device is limited in power when the power cannot be limited, the energy storage device discharges when the power cannot be discharged, and the like.
In summary, how to provide a power distribution method for an energy management system, and reasonably adjusting energy flow in an optical storage grid-connected power generation system becomes a technical problem that needs to be solved urgently by technical personnel in the field.
Disclosure of Invention
In view of this, the invention discloses a power distribution method of an energy management system and the energy management system, so as to enable the energy flow in an optical storage grid-connected power generation system to be reasonably adjusted when the management system performs power distribution.
A method of power allocation for an energy management system, comprising:
obtaining power parameters of the optical storage grid-connected power generation system at the current moment, wherein the power parameters at least comprise: the method comprises the following steps of (1) feeding network power, each energy storage device power and each energy storage device power limit value;
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 equipment is the sum of all the energy storage equipment powers;
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 the power limit of each energy storage device specifically includes:
obtaining the 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 energy storage device power limit value of each energy storage device to obtain an initial power correction value meeting a preset charging and discharging power condition;
calculating a power difference value between the target total power and the sum of the corrected power values of the energy storage equipment, and recording the power difference value as a first power difference value;
acquiring the total amount of target energy storage equipment;
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, according to the target total power and the total number of energy storage devices, the initial power allocated to each energy storage device specifically includes:
acquiring the charge state of each energy storage device;
calculating the average value of the state of charge of each energy storage device;
calculating the initial power distributed by each energy storage device according to the following formula;
Pbat_ref[i]＝Pres/N+ksoc(SOCave-SOCi)；
in the formula, Pbat_ref[i]For the initial power, i is eachNumber of the light storage subsystem in which the energy storage system is located, PresFor the target total power, N is the total number of the energy storage devices, ksocFor the SOC equalization coefficient, SOCave is the average value of the states of charge, SOCave ∑ SOCi/N, and SOCi is the state of charge of the energy storage device in the ith optical storage subsystem.
Optionally, the preset charge and discharge power condition is as follows: the initial power correction value is greater than 0 and not greater than the maximum charging power during charging, the initial power correction value is less than 0 and not less than the maximum discharging power during discharging, and the maximum discharging power is a negative value.
Optionally, the determining the latest target power allocated to each energy storage device based on the first power difference and the total number of the target energy storage devices specifically includes:
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;
determining a power sum of the initial power and power amplitude values as the latest target power allocated to each of the energy storage devices if the total number of target energy storage devices is not equal to 0 and the first power difference value is not equal to 0, the power amplitude values being: and the first power difference value and the total quantity of the target energy storage equipment are obtained by quotient calculation.
Optionally, the method further includes: 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 performing power distribution on each energy storage device is finished.
Optionally, the target energy storage devices corresponding to the total number of the target energy storage devices are: the energy storage device with the initial power correction value not reaching the maximum charging power or the energy storage device with the initial power correction value not reaching the maximum discharging power.
Optionally, the method further includes:
calculating a power difference value between the feeder network power and the maximum feeder network power limit value, and recording 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, the determining, according to the second power difference, an output power limit value allocated to each light storage inverter specifically includes:
judging whether the second power difference value is larger than 0;
if yes, 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 completely distributed;
if not, increasing a power amplitude limit value to the output power limit values of all the light storage inverters so as to correct all the output power limit values, wherein the power amplitude limit value is as follows: a quotient of an absolute value of the second power difference and a total number of the light storage inverters.
Optionally, starting from the light storage inverter with the maximum output power of the light storage inverter, based on the second power difference, sequentially performing an operation of limiting the output power limit on all the light storage inverters until the second power difference is completely allocated, specifically including:
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 optical storage inverter as an initial value of an output power value of the optical storage inverter to be compared, and judging whether the power difference value to be distributed is larger than the output power value of the optical storage inverter to be compared;
if not, determining the difference value between the output power value of the optical storage inverter to be compared and the difference value of the power to be distributed as the output power limit value of the optical storage inverter corresponding to the output power value of the optical storage inverter to be compared;
if yes, determining the 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 optical storage inverter to be compared, and recording as a third power difference value;
and taking the third power difference value as a latest power difference value to be distributed, taking the second largest value of the output power of the optical storage inverter as the latest power value of the optical storage inverter to be compared, and executing the operation of limiting the output power limit value on the optical storage inverter corresponding to the latest power value of the optical 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 acquiring unit is used for acquiring the power parameters of the optical storage grid-connected power generation system at the current moment, and the power parameters at least comprise: the method comprises the following steps of (1) feeding network power, each energy storage device power and each energy storage device power limit value;
the total power calculating unit is used for 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 equipment is the sum of all the energy storage equipment powers;
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 configured to obtain initial power allocated to 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 energy storage device power limit value of each energy storage device to obtain an initial power correction value meeting a preset charging and discharging power condition;
the power difference value calculating operator unit is used for calculating a power difference value of the total target power and the sum of the corrected energy storage equipment power values and recording the power difference value as a first power difference value;
the equipment quantity acquiring 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 allocated to each energy storage device based on the first power difference and the total number of the target energy storage devices.
Optionally, the first power determining subunit is specifically configured to:
acquiring the charge state of each energy storage device;
calculating the average value of the state of charge of each energy storage device;
calculating the initial power distributed by each energy storage device according to the following formula;
Pbat_ref[i]＝Pres/N+ksoc(SOCave-SOCi)；
in the formula, Pbat_ref[i]For the initial power, i is the number of the optical storage subsystem where each energy storage system is located, PresFor the target total power, N is the total number of the energy storage devices, ksocFor the SOC equalization coefficient, SOCave is the average value of the states of charge, SOCave ∑ SOCi/N, and 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 or not and whether the first power difference value is 0 or not;
determining a power sum of the initial power and power amplitude values as the latest target power allocated to each of the energy storage devices if the total number of target energy storage devices is not equal to 0 and the first power difference value is not equal to 0, the power amplitude values being: and the first power difference value and the total quantity of the target energy storage equipment are obtained by quotient calculation.
Optionally, the method further includes:
the power difference value calculating unit is used for 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 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 allocating unit specifically includes:
a second determining subunit, configured to determine 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 power of the light storage inverter is the maximum power, start from the light storage inverter that outputs the maximum power, and sequentially perform, based on the second power difference, an operation of limiting an output power limit on all the light storage inverters until the second power difference is completely allocated;
a power limit correction subunit, configured to, if the second determination subunit determines that the output power limit is negative, add a power amplitude limit to the output power limits of all the light storage inverters to correct all the output power limits, where the power amplitude limit is: a quotient of an absolute value of the second power difference and a 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 optical storage inverter as an initial value of an output power value of the optical storage inverter to be compared, and judging whether the power difference value to be distributed is larger than the output power value of the optical storage inverter to be compared;
if not, determining the difference value between the output power value of the optical storage inverter to be compared and the difference value of the power to be distributed as the output power limit value of the optical storage inverter corresponding to the output power value of the optical storage inverter to be compared;
if yes, determining the 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 optical storage inverter to be compared, and recording as a third power difference value;
and taking the third power difference value as a latest power difference value to be distributed, taking the second largest value of the output power of the optical storage inverter as the latest power value of the optical storage inverter to be compared, and executing the operation of limiting the output power limit value on the optical storage inverter corresponding to the latest power value of the optical storage inverter to be compared, and repeating the operation until the power difference value to be distributed is completely distributed.
According to the technical scheme, 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 the 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 a 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. According to the invention, when power distribution is carried out, the power grid and the energy storage equipment which have the functions of providing power and consuming power are used as controllable objects, the photovoltaic equipment and the load are used as uncontrollable objects, 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 current moment feed network power and the total power of the energy storage equipment, so that a single photovoltaic subsystem only needs to output power according to the self maximum capacity or the maximum output power limit value, thereby simplifying the condition of energy flow in the single photovoltaic subsystem and realizing reasonable adjustment of energy flow in the light storage grid connection discovery system.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the disclosed drawings without creative efforts.
FIG. 1 is a flow chart of a power allocation method of 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 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 another power allocation method for an energy management system according to an embodiment of the present disclosure;
FIG. 4 is a flowchart of a method for determining output power limits assigned to each of the light-storing inverters according to the second power difference, according to an embodiment of the present invention;
fig. 5 is a flowchart of a method for determining an output power limit allocated to each photo-storage inverter according to 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 structural diagram of a power distribution system of an energy management system according to an embodiment of the disclosure;
fig. 7 is a schematic structural diagram of a power distribution unit according to an embodiment of the disclosure;
fig. 8 is a schematic structural diagram of a power distribution system of another energy management system according to an embodiment of the disclosure.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present 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 obtaining power parameters of a light 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 a 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. According to the invention, when power distribution is carried out, the power grid and the energy storage equipment which have the functions of providing power and consuming power are used as controllable objects, the photovoltaic equipment and the load are used as uncontrollable objects, 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 current moment feed network power and the total power of the energy storage equipment, so that a single photovoltaic subsystem only needs to output power according to the self maximum capacity or the maximum output power limit value, thereby simplifying the condition of energy flow in the single photovoltaic subsystem and realizing reasonable adjustment of energy flow in the light storage grid connection discovery system.
Referring to fig. 1, a flowchart of a power allocation method of an energy management system according to an embodiment of the present invention is disclosed, where the method includes:
s101, acquiring a power parameter of the optical storage grid-connected power generation system at the current moment;
the power parameter in this embodiment is actually a power parameter transmitted to an energy management system in the optical storage grid-connected power generation system, and 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.
Grid-fed power refers to the power provided and consumed by the grid in a grid-connected optical storage 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 devices is the sum of all the energy storage device powers.
Suppose that the feed network power is PfeedinRepresenting, for each energy storage device, power Pbat [ i ]]I represents the number of the optical storage subsystem where the energy storage equipment is located, and the total power of the energy storage equipment is sigma Pbat[i]。
Thus, the target total power Pres＝Pfeedin+ΣPbat[i]。
It should be noted that the target total power P in the overload situationresThe value of (a) needs to be adjusted accordingly based on the overload condition.
Step S103, determining target power distributed to each energy storage device according to the target total power and each energy storage device power limit value.
Wherein the target power includes: charging power or discharging power.
In summary, the invention discloses a power distribution method of an energy management system, which includes 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 a 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. According to the invention, when power distribution is carried out, the power grid and the energy storage equipment which have the functions of providing power and consuming power are used as controllable objects, the photovoltaic equipment and the load are used as uncontrollable objects, 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 current moment feed network power and the total power of the energy storage equipment, so that a single photovoltaic subsystem only needs to output power according to the self maximum capacity or the maximum output power limit value, thereby simplifying the condition of energy flow in the single photovoltaic subsystem and realizing reasonable adjustment of energy flow in the light storage grid connection discovery system.
In order to further optimize the above embodiment, 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 of each energy storage device disclosed in the embodiment of the present invention, that is, step S103 may specifically 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) initial power P allocated to each energy storage device when balancing without considering SOC (State Of Charge) Of the energy storage devicesbat_ref[i]The expression of (a) is as follows:
Pbat_ref[i]＝Pres/N；
wherein i represents the number of the optical storage subsystem where the energy storage device is located, PresAnd N is the total amount of energy storage equipment.
(2) When considering SOC equalization of the energy storage device, step S201 may specifically include:
A. acquiring the charge state of each energy storage device;
B. and calculating the state of charge average value SOcave of each energy storage device as Σ SOCi/N, wherein SOCi is the state of charge 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 formulabat_ref[i]；
Pbat_ref[i]＝Pres/N+ksoc(SOCave-SOCi)；
In the formula, ksocIs the SOC equalization coefficient.
Therefore, the invention also has certain SOC balancing 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 charging and discharging power condition;
wherein the preset charge and discharge power conditions are as follows: the initial power correction value is greater than 0 and not greater than the maximum charging power during charging, the initial power correction value is less than 0 and not less than the maximum discharging power during discharging, and the maximum discharging power is a negative value.
Because the charging and discharging 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 to the energy storage devices needs to be corrected according to the power limit value of the energy storage devices, so that the normal work of each energy storage device is ensured.
The target of the initial power correction in this embodiment is: when the energy storage device is charged, 0<Pbat_ref_correct[i]≤Plim_c[i]When the energy storage device is discharged-Plim_d[i]≤Pbat_ref_correct[i]<0, wherein Plim_c[i]For maximum charging power, -Plim_d[i]The maximum discharge power and is negative.
In practical applications, in order to prevent a photovoltaic device of one photovoltaic storage inverter from charging an energy storage device of another photovoltaic storage inverter, the maximum charging power P of the energy storage device may be limitedlim_c[i]≤Ppv[i]，Ppv[i]Is a photovoltaicReal-time power of the device.
Step S203, calculating a power difference value between the target total power and the sum of the corrected energy storage device power values, and recording the power difference value as a first power difference value;
and the sum of the corrected power values of the energy storage devices is the sum of the corrected initial power values of all the energy storage devices.
First power difference Δ PresThe expression of (a) is as follows:
ΔPres＝Pres-∑Pbat_ref_correct[i]；
in the formula, PresFor a target total power, SIG Pbat_ref_correct[i]Is the sum of the corrected energy storage device power values.
Step S204, acquiring the total amount of target energy storage equipment;
the target energy storage device is: the initial power correction value does not reach the maximum charging power (P)res>0), or initial power correction value does not reach the maximum discharge power (P)res<0 time).
And S205, determining the latest target power distributed by each energy storage device based on the first power difference and the total number of the target energy storage devices.
Step S205 may specifically include:
(1) judging whether the total quantity of the target energy storage equipment is 0 or not and whether the first power difference value is 0 or not;
(2) and if the total number of the target energy storage devices is not equal to 0 and the first power difference value is not equal to 0, determining the power sum of the initial power and power amplitude values as the latest target power allocated to each energy storage device.
The power amplitude values are: and the first power difference value and the total quantity of the target energy storage equipment are obtained by quotient calculation.
When the total number of the target energy storage devices N1 is not equal to 0, and the first power difference value delta PresWhen the value is not equal to 0, the maximum charging power and the maximum discharging power which are not all reached by the energy storage device are indicated, and at the moment, the initial power and the power amplitude value delta P are comparedresThe power sum of/N1 is determined to be currentThe next moment of time is the latest initial power allocated to each energy storage device, and the step S202 is returned to continue to 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 value is equal to 0, determining that the operation of performing power distribution on each energy storage device is finished.
When Δ PresIf 0 and/or N1 is 0, it is determined that the maximum charging power and the maximum discharging power have been reached for all energy storage devices, and the operation of allocating power to the energy storage devices is determined to be finished.
It should be noted that the invention can also distribute the excess power among a plurality of light storage inverters under the condition that the energy of the power limiting and energy storage device is limited.
Therefore, to further optimize the above embodiment, referring to fig. 3, a flowchart of a power allocation 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 feeder network power and the maximum feeder network power limit value, and recording as a second power difference value;
the value of the maximum feeder power limit is determined according to actual needs, and the invention is not limited herein.
And 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 is Δ Pfeedin>When the output power of the optical storage inverter is limited, the feeding network power is reduced by indicating that the feeding network power exceeds the maximum feeding network power limit value; when Δ Pfeedin<And when the output power of the optical storage inverter is 0, the power of the feed network does not exceed the maximum feed network power limit value, and the output power limit value of the optical storage inverter needs to be recovered.
In summary, the output power limit of the optical storage inverter is adjusted based on the power difference between the feeder network power and the maximum feeder network power limit, so that the feeder network power can be prevented from exceeding the maximum feeder network power limit.
When the power parameter of the optical storage grid-connected power generation system at the current moment further includes the output power of each optical storage inverter, referring to fig. 4, the method disclosed in the embodiment of the present invention determines the output power limit value allocated to each optical storage inverter according to the second power difference value, and the method includes:
step S301, judging whether the second power difference value is larger than 0, if so, executing step S302, otherwise, executing step S303;
step S302, starting from the light storage inverter with the maximum output power of the light storage inverter, 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 completely 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, that is, step S302 may specifically include:
s401, 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.
The preset ordering requirement may be in a large-to-small order or in a small-to-large order.
Step S402, taking the second power difference value as an initial value of the power difference value to be distributed, taking the maximum value of the output power of the optical storage inverter as an initial value of the output power value of the optical storage inverter to be compared, judging whether the power difference value to be distributed is larger than the output power value of the optical storage inverter to be compared, if not, executing step S403, and if so, executing step S404;
step S403, determining a difference between the output power value of the to-be-compared optical storage inverter and the power difference to be allocated as an output power limit value of the optical storage inverter corresponding to the output power value of the to-be-compared optical storage inverter;
step S404, determining the 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 value between the power difference value to be distributed and the output power value of the optical storage inverter to be compared, and recording the difference value as a third power difference value;
and step S406, taking the third power difference value as a latest power difference value to be distributed, taking the second largest value of the output power of the optical storage inverter as the latest power value of the optical storage inverter to be compared, returning to the step S402, executing the operation of limiting the output power limit value on the optical storage inverter corresponding to the latest power value of the optical storage inverter to be compared, and repeating the operation until the power difference value to be distributed is completely distributed.
The invention converts the output power P of the light storage inverterinv[m]And sequencing according to the sequence from large to small, starting to execute the operation of limiting the output power limit value of the optical storage inverter from the optical storage inverter with the maximum output power until the output power limit value of the optical storage inverter with the maximum output power is 0, if the second power difference value is remained, continuing to execute the operation of limiting the output power limit value on the optical storage inverter with the second largest output power, and so on until the third power difference value is completely distributed. The method is simple, and the output power limit value of the light storage inverter can be changed as little as possible.
For example, assume that the current output power P of each light storage inverter isinv[m]Sequencing according to the sequence from big to small to obtain Pinv[j[1]]＞Pinv[j[2]]…＞Pinv[j[k]]…＞Pinv[j[M]]，m＝j[k]，j[k]For the inverter number corresponding to the light storage inverter, k belongs to [1, M ∈]And M is the total number of the light storage inverters.
Suppose that the current executing optical storage inverter number limiting the output power limit is m ═ j [ k [ ]]The second power difference is Δ Pfeed；
Determination of Δ Pfeed＞Pinv[j[k]]If yes, then the light storage inverter j [ k ]]Output power limit value Pinv_lim[j[k]]＝0，ΔPfeed＝ΔPfeed-Pinv[j[k]]K is k +1, and when k > M-1, the process returns to judge Δ P againfeed＞Pinv[j[k+1]]If true, the initial value of k is 1.
When Δ Pfeed＞Pinv[j[k]]If not, the light storage inverter j [ k ]]Output power limit value Pinv_lim[j[k]]＝Pinv[j[k]]-ΔPfeed，n＞k，Pinv_lim[j[n]]And is not changed.
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 value is as follows: second power difference Δ PfeedThe quotient of the absolute value of (a) and the total number M of light storage inverters.
The expression of the corrected output power limit of each light storage inverter is as follows:
Pbat_ref_correct[i]＝Pinv_lim[i]+|ΔPfeedin|/M；
in the formula, Pinv_lim[i]For output power limit before correction, | Δ PfeedinAnd | M is a power amplitude limit value.
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 disclosed in an embodiment of the present invention 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 method comprises the following steps of (1) feeding network power, each energy storage device power and each energy storage device power limit value;
grid-fed power refers to the power provided and consumed by the grid in a grid-connected optical storage power generation system.
A total power calculating unit 502, configured to calculate a total sum of the feeder network power and a total power of the energy storage devices to obtain a target total power, where the total power of the energy storage devices is a total sum of powers of all the energy storage devices;
a power allocating 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, where the target power includes: charging power or discharging power.
In summary, the invention discloses a power distribution system of an energy management system, which obtains power parameters of a light storage grid-connected power generation system at the current moment, calculates the sum of the power of a feed network and the total power of energy storage equipment to obtain a target total power, and determines 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. According to the invention, when power distribution is carried out, the power grid and the energy storage equipment which have the functions of providing power and consuming power are used as controllable objects, the photovoltaic equipment and the load are used as uncontrollable objects, 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 current moment feed network power and the total power of the energy storage equipment, so that a single photovoltaic subsystem only needs to output power according to the self maximum capacity or the maximum output power limit value, thereby simplifying the condition of energy flow in the single photovoltaic subsystem and realizing reasonable adjustment of energy flow in the light storage grid connection discovery system.
To further optimize the above embodiments, referring to fig. 7, a schematic structural diagram of a power distribution unit disclosed in the embodiments of the present invention is shown, where the power distribution unit includes:
the first power determination subunit 601 is configured to obtain initial power allocated to each energy storage device according to the target total power and the total number of energy storage devices;
(1) initial power P allocated to each energy storage device when balancing without considering SOC (State Of Charge) Of the energy storage devicesbat_ref[i]The expression of (a) is as follows:
Pbat_ref[i]＝Pres/N；
wherein i represents the number of the optical storage subsystem where the energy storage device is located, PresAnd N is the total amount of energy storage equipment.
(2) When considering SOC equalization of the energy storage device, the first power determination subunit is specifically configured to:
acquiring the charge state of each energy storage device;
calculating the average value of the state of charge of each energy storage device;
calculating the initial power distributed by each energy storage device according to the following formula;
Pbat_ref[i]＝Pres/N+ksoc(SOCave-SOCi)；
in the formula, Pbat_ref[i]For the initial power, i is the number of the optical storage subsystem where each energy storage system is located, PresFor the target total power, N is the total number of the energy storage devices, ksocFor the SOC equalization coefficient, SOCave is the average value of the states of charge, SOCave ∑ SOCi/N, and 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 of each energy storage device, so as to obtain an initial power correction value that meets a preset charging and discharging power condition;
wherein the preset charge and discharge power conditions are as follows: the initial power correction value is greater than 0 and not greater than the maximum charging power during charging, the initial power correction value is less than 0 and not less than the maximum discharging power during discharging, and the maximum discharging power is a negative value.
Because the charging and discharging 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 to the energy storage devices needs to be corrected according to the power limit value of the energy storage devices, so that the normal work of each energy storage device is ensured.
A power difference value calculating operator unit 603, configured to calculate a power difference value between the target total power and a sum of power correction values of the energy storage devices, and record the power difference value as a first power difference value, where the sum of the power correction values of the energy storage devices is a sum of the initial power correction values of all the energy storage devices;
the device quantity obtaining subunit 604 is configured to obtain the total quantity of the target energy storage devices;
the target energy storage device in this embodiment may be: the energy storage device with the initial power correction value not reaching the maximum charging power or the energy storage device with the initial power correction value not reaching the maximum discharging power;
a latest target power determining subunit 605, configured to determine, based on the first power difference and the total number of the target energy storage devices, a latest target power allocated to each energy storage device.
In practical applications, the latest target power determining subunit 605 is specifically configured to:
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;
determining a power sum of the initial power and power amplitude values as the latest target power allocated to each of the energy storage devices if the total number of target energy storage devices is not equal to 0 and the first power difference value is not equal to 0, the power amplitude values being: and the first power difference value and the total quantity of the target energy storage equipment are obtained by quotient calculation.
To further optimize the above embodiment, the latest target power determination subunit 605 may also be used 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 performing power distribution on each energy storage device is finished.
It should be noted that the invention can also distribute the excess power among a plurality of light storage inverters under the condition that the energy of the power limiting and energy storage device is limited.
Therefore, in order to further optimize the above 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, on the basis of the embodiment shown in fig. 6:
a power difference calculation unit 504, configured to calculate a power difference between the feeder network power and a maximum feeder network power limit, and record the power difference as a second power difference;
and a power limit value allocation unit 505, configured to determine an output power limit value allocated to each light storage inverter according to the second power difference value.
When the second power difference is Δ Pfeedin>When the output power of the optical storage inverter is limited, the feeding network power is reduced by indicating that the feeding network power exceeds the maximum feeding network power limit value; when Δ Pfeedin<And when the output power of the optical storage inverter is 0, the power of the feed network does not exceed the maximum feed network power limit value, and the output power limit value of the optical storage inverter needs to be recovered.
In summary, the output power limit of the optical storage inverter is adjusted based on the power difference between the feeder network power and the maximum feeder network power limit, so that the feeder network power can be prevented from exceeding the maximum feeder network power limit.
In this embodiment, the power limit allocating unit 505 specifically includes:
a second determining subunit, configured to determine 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 power of the light storage inverter is the maximum power, start from the light storage inverter that outputs the maximum power, and sequentially perform, based on the second power difference, an operation of limiting an output power limit on all the light storage inverters until the second power difference is completely allocated;
a power limit correction subunit, configured to, if the second determination subunit determines that the output power limit is negative, add a power amplitude limit to the output power limits of all the light storage inverters to correct all the output power limits, where the power amplitude limit is: a quotient of an absolute value of the second power difference and a total number of the light storage inverters.
To further optimize the above embodiment, 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 optical storage inverter as an initial value of an output power value of the optical storage inverter to be compared, and judging whether the power difference value to be distributed is larger than the output power value of the optical storage inverter to be compared;
if not, determining the difference value between the output power value of the optical storage inverter to be compared and the difference value of the power to be distributed as the output power limit value of the optical storage inverter corresponding to the output power value of the optical storage inverter to be compared;
if yes, determining the 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 optical storage inverter to be compared, and recording as a third power difference value;
and taking the third power difference value as a latest power difference value to be distributed, taking the second largest value of the output power of the optical storage inverter as the latest power value of the optical storage inverter to be compared, and executing the operation of limiting the output power limit value on the optical storage inverter corresponding to the latest power value of the optical storage inverter to be compared, and repeating the operation until the power difference value to be distributed is completely distributed.
It should be noted that, for the specific working principle of each component in the system embodiment, please refer to the corresponding part of the method embodiment, which is not described herein again.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be 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. Also, 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 an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred 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 (17)

1. A method of power allocation for an energy management system, comprising:
obtaining power parameters of the optical storage grid-connected power generation system at the current moment, wherein the power parameters at least comprise: the method comprises the following steps of (1) feeding network power, each energy storage device power and each energy storage device power limit value;
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 equipment is the sum of all the energy storage equipment powers;
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.
2. The power distribution method according to claim 1, wherein the determining the target power distributed to each energy storage device according to the target total power and each energy storage device power limit value specifically comprises:
obtaining the 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 energy storage device power limit value of each energy storage device to obtain an initial power correction value meeting a preset charging and discharging power condition;
calculating a power difference value between the target total power and the sum of the corrected power values of the energy storage equipment, and recording the power difference value as a first power difference value;
acquiring the total amount of target energy storage equipment;
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.
3. The power allocation method according to claim 2, wherein the obtaining of the initial power allocated to each energy storage device according to the target total power and the total number of energy storage devices specifically comprises:
acquiring the charge state of each energy storage device;
calculating the average value of the state of charge of each energy storage device;
calculating the initial power distributed by each energy storage device according to the following formula;
Pbat_ref[i]＝Pres/N+ksoc(SOCave-SOCi)；
in the formula, Pbat_ref[i]For the initial power, i is the number of the optical storage subsystem where each energy storage system is located, PresFor the target total power, N is the total number of the energy storage devices, ksocFor the SOC equalization coefficient, SOCave is the average value of the states of charge, SOCave ∑ SOCi/N, and SOCi is the state of charge of the energy storage device in the ith optical storage subsystem.
4. The power distribution method according to claim 2, wherein the preset charge-discharge power conditions are: the initial power correction value is greater than 0 and not greater than the maximum charging power during charging, the initial power correction value is less than 0 and not less than the maximum discharging power during discharging, and the maximum discharging power is a negative value.
5. The power allocation method according to claim 2, wherein the determining a latest target power allocated to each energy storage device based on the first power difference and the total number of the target energy storage devices specifically comprises:
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;
determining a power sum of the initial power and power amplitude values as the latest target power allocated to each of the energy storage devices if the total number of target energy storage devices is not equal to 0 and the first power difference value is not equal to 0, the power amplitude values being: and the first power difference value and the total quantity of the target energy storage equipment are obtained by quotient calculation.
6. The power allocation method of claim 5, 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 performing power distribution on each energy storage device is finished.
7. The power distribution method according to claim 2, wherein the total number of the target energy storage devices corresponds to the following target energy storage devices: the energy storage device with the initial power correction value not reaching the maximum charging power or the energy storage device with the initial power correction value not reaching the maximum discharging power.
8. The power allocation method of claim 1, further comprising:
calculating a power difference value between the feeder network power and the maximum feeder network power limit value, and recording 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.
9. The power distribution method according to claim 8, wherein when the power parameter further includes output power of each optical storage inverter, the determining an output power limit value distributed to each optical storage inverter according to the second power difference value specifically includes:
judging whether the second power difference value is larger than 0;
if yes, 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 completely distributed;
if not, increasing a power amplitude limit value to the output power limit values of all the light storage inverters so as to correct all the output power limit values, wherein the power amplitude limit value is as follows: a quotient of an absolute value of the second power difference and a total number of the light storage inverters.
10. The power distribution method according to claim 9, wherein the sequentially performing, starting from the light storage inverter with the maximum light storage inverter output power, 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 comprises:
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 optical storage inverter as an initial value of an output power value of the optical storage inverter to be compared, and judging whether the power difference value to be distributed is larger than the output power value of the optical storage inverter to be compared;
if not, determining the difference value between the output power value of the optical storage inverter to be compared and the difference value of the power to be distributed as the output power limit value of the optical storage inverter corresponding to the output power value of the optical storage inverter to be compared;
if yes, determining the 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 optical storage inverter to be compared, and recording as a third power difference value;
and taking the third power difference value as a latest power difference value to be distributed, taking the second largest value of the output power of the optical storage inverter as the latest power value of the optical storage inverter to be compared, and executing the operation of limiting the output power limit value on the optical storage inverter corresponding to the latest power value of the optical storage inverter to be compared, and repeating the operation until the power difference value to be distributed is completely distributed.
11. An energy management system, comprising:
the acquiring unit is used for acquiring the power parameters of the optical storage grid-connected power generation system at the current moment, and the power parameters at least comprise: the method comprises the following steps of (1) feeding network power, each energy storage device power and each energy storage device power limit value;
the total power calculating unit is used for 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 equipment is the sum of all the energy storage equipment powers;
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.
12. The power distribution system of claim 11, wherein the power distribution unit specifically comprises:
the first power determining subunit is configured to obtain initial power allocated to 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 energy storage device power limit value of each energy storage device to obtain an initial power correction value meeting a preset charging and discharging power condition;
the power difference value calculating operator unit is used for calculating a power difference value of the total target power and the sum of the corrected energy storage equipment power values and recording the power difference value as a first power difference value;
the equipment quantity acquiring 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 allocated to each energy storage device based on the first power difference and the total number of the target energy storage devices.
13. The power distribution system of claim 12, wherein the first power determining subunit is specifically configured to:
acquiring the charge state of each energy storage device;
calculating the average value of the state of charge of each energy storage device;
calculating the initial power distributed by each energy storage device according to the following formula;
Pbat_ref[i]＝Pres/N+ksoc(SOCave-SOCi)；
in the formula, Pbat_ref[i]For the initial power, i is the number of the optical storage subsystem where each energy storage system is located, PresFor the target total power, N is the total number of the energy storage devices, ksocFor the SOC equalization coefficient, SOCave is the average value of the states of charge, SOCave ∑ SOCi/N, and SOCi is the state of charge of the energy storage device in the ith optical storage subsystem.
14. The power distribution system of claim 12, wherein the latest target power determination subunit is specifically configured to:
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;
determining a power sum of the initial power and power amplitude values as the latest target power allocated to each of the energy storage devices if the total number of target energy storage devices is not equal to 0 and the first power difference value is not equal to 0, the power amplitude values being: and the first power difference value and the total quantity of the target energy storage equipment are obtained by quotient calculation.
15. The power distribution system of claim 11, further comprising:
the power difference value calculating unit is used for 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 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.
16. The power distribution system of claim 15, wherein the power limit distribution unit specifically comprises:
a second determining subunit, configured to determine 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 power of the light storage inverter is the maximum power, start from the light storage inverter that outputs the maximum power, and sequentially perform, based on the second power difference, an operation of limiting an output power limit on all the light storage inverters until the second power difference is completely allocated;
a power limit correction subunit, configured to, if the second determination subunit determines that the output power limit is negative, add a power amplitude limit to the output power limits of all the light storage inverters to correct all the output power limits, where the power amplitude limit is: a quotient of an absolute value of the second power difference and a total number of the light storage inverters.
17. The power distribution system of claim 16, 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 optical storage inverter as an initial value of an output power value of the optical storage inverter to be compared, and judging whether the power difference value to be distributed is larger than the output power value of the optical storage inverter to be compared;
if not, determining the difference value between the output power value of the optical storage inverter to be compared and the difference value of the power to be distributed as the output power limit value of the optical storage inverter corresponding to the output power value of the optical storage inverter to be compared;
if yes, determining the 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 optical storage inverter to be compared, and recording as a third power difference value;
and taking the third power difference value as a latest power difference value to be distributed, taking the second largest value of the output power of the optical storage inverter as the latest power value of the optical storage inverter to be compared, and executing the operation of limiting the output power limit value on the optical storage inverter corresponding to the latest power value of the optical storage inverter to be compared, and repeating the operation until the power difference value to be distributed is completely distributed.
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