CN112491095B - New energy power station and power optimal distribution method thereof - Google Patents

New energy power station and power optimal distribution method thereof Download PDF

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CN112491095B
CN112491095B CN202011309068.XA CN202011309068A CN112491095B CN 112491095 B CN112491095 B CN 112491095B CN 202011309068 A CN202011309068 A CN 202011309068A CN 112491095 B CN112491095 B CN 112491095B
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power
generation unit
new energy
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CN112491095A (en
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高强
江跃
崔炎坤
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Sungrow Renewables Development 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
    • H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
    • 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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers

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  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The application discloses a new energy power station and a power optimization distribution method of the new energy power station, and aims to achieve the purpose that the actual power of the new energy power station in a power limiting state can reach the target power all the time or the actual power can approach the target power to the maximum extent. The method comprises the following steps: when the new energy power station is in the power limiting state, if the actual power P of the new energy power station sum ＜P target Delta, performing power distribution of the new energy power station by adopting an equal margin distribution strategy; if P sum Power target P target + δ, then: executing an equal proportion distribution strategy to obtain the current actual power P of the new energy power station sum ', if | P sum '‑P target If the power distribution value is greater than S, searching the power generation unit with the difference value between the power distribution value and the actual power less than or equal to K, and increasing the control proportion of the power generation unit meeting the requirement until P sum '‑P target And quitting the control when | ≦ S or no power generation unit meeting the requirement exists.

Description

New energy power station and power optimal distribution method thereof
Technical Field
The invention relates to the technical field of new energy power generation, in particular to a new energy power station and a power optimization distribution method of the new energy power station.
Background
In order to implement power scheduling of a new energy power station (e.g., a photovoltaic power station), it is necessary to distribute target power of the new energy power station to each power generation unit (a power generation unit refers to a controllable output unit formed by combining one or more power generation units) according to a certain strategy, and enable each power generation unit to independently perform power tracking.
At present, two most commonly used allocation strategies are an equal margin allocation strategy and an equal proportion allocation strategy. The equal margin distribution strategy requires that the ith power generation unit distributes values according to power
Figure BDA0002789201710000011
Carrying out power tracking, and requiring the ith generating unit to distribute values according to power distribution value by an equal proportion distribution strategy
Figure BDA0002789201710000012
Carrying out power tracking, i =1, 2, \ 8230, n, n is the total number of the power generation units, n is more than or equal to 2, P target Is the target power, P, of the new energy power station si Is the actual power of the ith power generation unit, P Rated_i Rated power of the ith power generation unit。
However, the two allocation strategies have disadvantages, specifically: since the maximum output of the power generation unit cannot be determined under the equal-margin distribution strategy, when the new energy power station is in a power-limited state, the equal-margin distribution strategy can only track the power of the power generation unit downwards but cannot track the power of the power generation unit upwards (the downward tracking refers to tracking in a direction of power reduction, and the upward tracking refers to tracking in a direction of power increase). The equal proportion distribution strategy can lead the generating units with strong generating capacity to be limited to generate electricity and the generating units with weak generating capacity to generate electricity in full proportion, thus leading the actual generating power of the new energy power station to be lower and possibly not reaching the target power P target 。
In conclusion, how to realize power optimal distribution of the new energy power station in the power limiting state enables the actual power of the new energy power station to reach or approach the target power P to the maximum extent target The problem to be solved in the art is urgent.
Disclosure of Invention
In view of this, the present invention provides a new energy power station and a power optimal allocation method for the new energy power station, so as to achieve that the actual power of the new energy power station in the power-limited state can reach the target power all the time or approach the target power to the maximum extent.
A power optimization distribution method for a new energy power station comprises the following steps:
when the new energy power station is in a power limiting state, acquiring target power P of the new energy power station target And the actual power P of the new energy power station sum And P target -δ、P target Comparing the + delta, wherein delta is a preset value not less than zero;
if P sum ＜P target Delta, performing power distribution of the new energy power station by adopting an equal margin distribution strategy;
if P sum ＞P target + δ, then: carrying out power distribution on the new energy power station by adopting an equal proportion distribution strategy; acquiring actual power P of the new energy power station under the equal proportion distribution strategy sum ', determine whether or not | P is satisfied sum '-P target S is not more than S, and S is a preset value not less than zero; if not, checking in the new energy power stationFinding out the power generation unit with the difference between the power distribution value and the actual power less than or equal to K, and increasing the control proportion of the power generation unit meeting the requirement until | P sum '-P target Stopping the execution of the judgment to determine whether | P is satisfied or not when | S ≦ S or there is no power generation unit satisfying the requirement sum '-P target A step of | ≦ S; wherein K is a preset value not less than zero, and the control ratio of the power generation unit is the power distribution value/P of the power generation unit target 。
Optionally, increasing the control ratio of the power generation unit meeting the requirement includes: increase the control ratio of the power generation unit satisfying this requirement
Figure BDA0002789201710000021
P nm The sum of the rated powers, P, of all the power generating units satisfying this requirement totalsum Is the sum of said differences for all power generating units not meeting this requirement.
Optionally, the performing power distribution of the new energy power station by using an equal margin distribution strategy includes:
allocating power to values
Figure BDA0002789201710000022
Sending to the ith power generation unit, and independently tracking power according to the power distribution value received by each power generation unit, P si The actual power of the ith power generation unit; alternatively, the ratio will be controlled
Figure BDA0002789201710000023
Sending the power to the ith power generation unit, and independently tracking the power of each power generation unit according to the control proportion received by each power generation unit, P Rated_i Is the rated power of the ith power generation unit.
Optionally, in any one of the above disclosed new energy power station power optimal distribution methods, the performing new energy power station power distribution by using an equal proportion distribution strategy includes:
allocating power to values
Figure BDA0002789201710000031
The power distribution value is sent to the ith power generation unit, and each power generation unit independently tracks power according to the power distribution value received by the power generation unit; alternatively, the ratio will be controlled
Figure BDA0002789201710000032
Sending the power to the ith power generation unit, and independently tracking the power of each power generation unit according to the control proportion received by each power generation unit, P Rated_i Is the rated power of the ith power generation unit.
Optionally, any one of the disclosed power optimization distribution methods for the new energy power station further includes:
when the new energy power station is in an unlimited power state: if P sum ＜P target Delta, outputting power by the new energy power station in a maximum power tracking mode; if P sum ＞P target And + delta, performing power distribution of the new energy power station by adopting an equal margin distribution strategy.
Optionally, in any of the above-disclosed new energy power station power optimal distribution methods, δ > 0, s > 0, and k > 0.
A new energy power station comprises a plurality of power generation units and a processor; the processor is used for running a program, and when the processor runs the program, the following steps are realized:
when the new energy power station is in a power limiting state, acquiring target power P of the new energy power station target And the actual power P of the new energy power station sum And P target -δ、P target Comparing the + delta, wherein delta is a preset value not less than zero;
if P sum ＜P target Delta, performing power distribution of the new energy power station by adopting an equal margin distribution strategy;
if P sum ＞P target + δ, then: carrying out power distribution on the new energy power station by adopting an equal proportion distribution strategy; acquiring actual power P of the new energy power station under the equal proportion distribution strategy sum ', determine whether | P is satisfied sum '-P target The | is less than or equal to S, and S is a preset value not less than zero; if not, searching power in the new energy power stationThe difference between the distribution value and the actual power is less than or equal to K, and then the control proportion of the power generation unit meeting the requirement is increased until | P sum '-P target Stopping the execution of the judgment to determine whether | P is satisfied or not when | S ≦ S or there is no power generation unit satisfying the requirement sum '-P target A step of | ≦ S; wherein K is a preset value not less than zero, and the control ratio of the power generation unit is the power distribution value/P of the power generation unit target 。
Optionally, increasing the control ratio of the power generation unit meeting the requirement includes: increase the control ratio of the power generation unit satisfying this requirement
Figure BDA0002789201710000033
P nm The sum of the rated powers, P, of all the power generating units satisfying this requirement totalsum Is the sum of said differences for all power generating units not fulfilling this requirement.
Optionally, in the new energy power station, the performing power distribution of the new energy power station by using an equal margin distribution strategy includes:
allocating power to values
Figure BDA0002789201710000041
Sending to the ith power generation unit, and independently tracking power according to the power distribution value received by each power generation unit, P si Actual power of the ith power generation unit; alternatively, the ratio will be controlled
Figure BDA0002789201710000042
Sending the power to the ith power generation unit, and independently tracking the power of each power generation unit according to the control proportion received by each power generation unit, P Rated_i Is the rated power of the ith power generation unit.
Optionally, in any one of the new energy power stations disclosed above, the performing power distribution of the new energy power station by using an equal proportion distribution strategy includes:
allocating power to values
Figure BDA0002789201710000043
The power distribution value is sent to the ith power generation unit, and each power generation unit independently tracks power according to the power distribution value received by the power generation unit; alternatively, the ratio will be controlled
Figure BDA0002789201710000044
Sending the power to the ith power generation unit, and independently tracking the power of each power generation unit according to the control proportion received by each power generation unit, P Rated_i Is the rated power of the ith power generation unit.
Optionally, in any one of the new energy power stations disclosed above, when the processor runs the program, the following steps are further implemented:
when the new energy power station is in an unlimited power state: if P sum ＜P target Delta, outputting power by the new energy power station in a maximum power tracking mode; if P sum ＞P target And + delta, carrying out power distribution on the new energy power station by adopting an equal margin distribution strategy.
Optionally, in any one of the new energy power stations disclosed above, δ > 0, s > 0, and k > 0.
According to the technical scheme, the power optimization distribution of the new energy power station in the power limiting state is realized by adopting two distribution strategies: adopting an equal margin distribution strategy when power needs to be tracked downwards; when the power needs to be tracked upwards, the power generation units with strong power generation capacity are enabled to generate more power on the basis of an equal proportion distribution strategy, so that the power generation amount which is deficient by the power generation units with weak power generation capacity is supplemented. Therefore, the actual power of the new energy power station in the power limiting state can reach the target power all the time or approach the target power to the maximum extent.
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 some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a flowchart of a new energy power station power optimal allocation method disclosed in an embodiment of the present invention;
FIG. 2 is a diagram of power limit/normal state switching of a new energy power station;
fig. 3 is a flowchart of another method for optimizing power distribution of a new energy power station according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a new energy power station disclosed in the embodiment of the present invention.
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.
Referring to fig. 1, an embodiment of the present invention discloses a new energy power station power optimal allocation method, including:
step S01: when the new energy power station is in a power limiting state, acquiring target power P of the new energy power station target 。
Specifically, the new energy power station is divided into an electricity-limited state and an electricity-unlimited state (i.e., a normal state). The power limiting state refers to a state of limiting the output power of the new energy power station under the control of a power limiting instruction issued by a power department or a power limiting signal generated by the new energy power station. The power limiting signal generated by the new energy power station itself is, for example, a power limiting signal generated by the new energy power station for realizing power optimal distribution. The normal state refers to a state in which the new energy plant outputs the maximum power. The power limit state/normal state switching diagram of the new energy power station is shown in fig. 2.
Step S02: will P sum And P target -δ、P target + δ comparison size; if P sum ＜P target δ, go to step S03; if P sum ＞P target + δ, go to step S04; if P target -δ≤P sum ≤P target + δ, the last allocation strategy is maintained, and the control of this round is ended. Wherein, P sum Delta is a preset value which is not less than zero and is the actual power of the new energy power station.
Specifically, under the condition that the new energy power station is in the power limiting state: if P sum ＜P target Then the power generation unit needs to track down the power to make P sum Tends to P target At the moment, the power optimization distribution of the new energy power station can be realized by adopting an equal margin distribution strategy; if P sum ＞P target The power generation unit needs to track power up to let P sum Tends to P target And because the equal-margin distribution strategy does not have the capability of tracking power upwards in the power-limited state of the new energy power station, another distribution strategy needs to be adopted to realize the optimized power distribution of the new energy power station.
The description of the peer-to-peer margin allocation strategy is specifically referred to the following step S03; for a description of the other allocation strategy, see the following steps S04 to S07.
In addition, according to P as mentioned above sum And P target When determining which allocation strategy to employ, taking into account when P sum At P target When the nearby frequency fluctuates, the two allocation strategies are frequently switched, so that the control is unstable, and in order to avoid this, the embodiment of the present invention recommends to adopt a hysteresis comparison method, that is: the hysteresis width is represented by delta 1, delta 1 > 0, at P sum ＜P target When delta 1, switching to an equal margin distribution strategy; at P sum ＞P target + δ 1, switch to another allocation strategy; at P target -δ1≤P sum ≤P target + δ 1, consider P sum And P target No deviation or small and negligible deviation is obtained between the two, and the distribution strategy at the last moment is maintained.
In the step S02, δ =0 or δ 1 indicates that the hysteresis comparison method is adopted when δ = δ 1, and indicates that the hysteresis comparison method is not adopted when δ =0, and both methods belong to the protection scope of the present invention.
Step S03: and (5) performing power distribution of the new energy power station by adopting an equal margin distribution strategy, and then ending the control in the current round.
Specifically, the equal margin allocation policy means: controlling the ith generating unit according to the power distribution value
Figure BDA0002789201710000061
Carrying out power tracking, i =1, 2, 8230, n, n is the total number of the generating units, n is more than or equal to 2 si Is the actual power of the ith power generation unit,
Figure BDA0002789201710000062
wherein the ith power generation unit is controlled according to the power distribution value
Figure BDA0002789201710000063
The power tracking is carried out, and the power distribution value can be obtained by the master control
Figure BDA0002789201710000064
The power distribution value is sent to the ith power generation unit, and each power generation unit independently tracks power according to the power distribution value received by the power generation unit; or the ratio can be controlled
Figure BDA0002789201710000065
Sending the power to the ith power generation unit, and independently tracking the power of each power generation unit according to the control proportion received by each power generation unit, P Rated_i Is the rated power of the ith power generation unit.
Step S04: and (5) performing power distribution of the new energy power station by adopting an equal proportion distribution strategy, and then entering the step S05.
The equal proportion distribution strategy is that: controlling the ith generating unit according to the power distribution value
Figure BDA0002789201710000071
Performing power tracking, P Rated_i Is the rated power of the ith power generation unit,
Figure BDA0002789201710000072
is the sum of the rated power of all the power generating units.
Wherein the ith power generation unit is controlled according to the power distribution value
Figure BDA0002789201710000073
The power tracking is carried out, and the power distribution value can be obtained by the master control
Figure BDA0002789201710000074
The power distribution value is sent to the ith power generation unit, and each power generation unit independently tracks power according to the power distribution value received by the power generation unit; alternatively, the master control will control the ratio
Figure BDA0002789201710000075
And (4) issuing the power to the ith power generation unit, and independently tracking the power by each power generation unit according to the control proportion received by the power generation unit.
Specifically, the equal proportion distribution strategy is to distribute the target power P of the new energy power station target According to the individual generating units
Figure BDA0002789201710000076
The proportion is distributed, so that the generation unit with strong generating capacity is limited to generate electricity, the generation unit with weak generating capacity cannot generate electricity in full proportion, and finally the actual power of the new energy power station is low and probably cannot reach the target power P target Thus, the target power P is not reached target The method needs to be further improved on the basis of an equal proportion distribution strategy, and is referred to from step S05 to step S07.
Step S05: acquiring actual power P of the new energy power station under the equal proportion distribution strategy sum ', determine whether | P is satisfied sum '-P target If the | is less than or equal to S, ending the control in the current round; if not, the process proceeds to step S06. Wherein S is a preset value not less than zero.
Specifically, when P is sum ' and P target Have a large deviation therebetween (i.e., deviation)The value is not less than S), the situation that the power optimized distribution of the new energy power station cannot be realized by adopting an equal proportion distribution strategy at present is shown; when P is present sum ' and P target When the deviation is smaller than S, the deviation is considered to be small and can be ignored, and at the moment, the power optimal distribution of the new energy power station is considered to be achieved by adopting an equal proportion distribution strategy.
Step S06: searching for a power generation unit with a power distribution value-actual power less than or equal to K, and if a power generation unit meeting the requirement is searched, entering the step S07; if no power generation unit meeting the requirement exists, the control of the current round is finished. Wherein, K is a preset value not less than zero.
Step S07: increasing the control proportion of the power generation unit meeting the requirement, wherein the control proportion of the power generation unit is the power distribution value/P of the power generation unit target . Thereafter, the process returns to step S05.
Specifically, in theory, the power generation unit with actual power reaching the power distribution value is a power generation unit with strong power generation capability, and the power generation unit with actual power smaller than the power distribution value is a power generation unit with weak power generation capability; in consideration of error influence, in practical application, the power generation unit with the power distribution value-actual power less than or equal to K is regarded as the power generation unit with strong power generation capacity, and the power generation unit with the power distribution value-actual power greater than K is regarded as the power generation unit with weak power generation capacity. When equal proportion distribution strategy is adopted, | P cannot be realized sum '-P target When | ≦ S, P can be supplemented by increasing the control proportion of the generating unit with strong generating capacity and allowing the generating unit with strong generating capacity to generate more power sum ' and P target The difference between them.
If P is not complemented after the control proportion is increased once sum ' and P target The difference between the two can be increased for several times to supplement P to the maximum sum ' and P target The difference between them. If the power generation unit with strong power generation capacity does not exist in the new energy power station, the situation that no space is continuously supplemented is indicated, and the control of the current round is finished.
Optionally, the embodiment of the present invention will meet this requirement in step S07All the control ratios of the power generation units are increased
Figure BDA0002789201710000081
P totalsum The sum of the differences between the power allocation values of the power generating units not meeting this requirement and the actual power.
As can be seen from the above description, the embodiment of the present invention cooperatively implements power optimized distribution of a new energy power station in a power-limited state by using two distribution strategies: adopting an equal margin distribution strategy when power needs to be tracked downwards; when the power is required to be tracked upwards, the power generation units with strong power generation capacity are enabled to generate more power on the basis of an equal proportion distribution strategy, so that the generated energy which is deficient in the power generation units with weak power generation capacity is supplemented. Therefore, the actual power of the new energy power station in the power limiting state can reach the target power all the time or approach the target power to the maximum extent.
Optionally, any one of the disclosed power optimization distribution methods for a new energy power station further includes:
when the new energy power station is in an unlimited power state: if P sum ＜P target - δ, the new energy plant discharges at maximum power; if P sum ＞P target + delta, adopting an equal margin distribution strategy to carry out power distribution of the new energy power station; if P target -δ≤P sum ≤P target + δ, the allocation policy at the previous time is maintained.
For example, as shown in fig. 3, the corresponding power optimal distribution method for the new energy power station includes:
step S11: obtaining target power P of new energy power station target 。
Step S12: and judging whether the new energy power station is in a power limiting state, if so, entering step S13, and if not, entering step S20.
Step S13: will P sum And P target -δ、P target + δ comparison size; if P sum ＜P target δ, go to step S14; if P sum ＞P target + δ, go to step S15; if P target -δ≤P sum ≤P target + δ, maintaining the allocation policy at the previous time, and endingAnd (5) controlling in the current round. Wherein, P sum Delta is a preset value which is not less than zero and is the actual power of the new energy power station.
Step S14: and (5) performing power distribution of the new energy power station by adopting an equal margin distribution strategy, and then ending the control in the current round.
Step S15: and (5) performing power distribution of the new energy power station by adopting an equal proportion distribution strategy, and then entering the step S16.
Step S16: acquiring actual power P of the new energy power station under the equal proportion distribution strategy sum ', determine whether or not | P is satisfied sum '-P target If the | is less than or equal to S, ending the control in the current round; if not, the process proceeds to step S17. Wherein, S is a preset value not less than zero.
Step S17: searching for a power generation unit with a power distribution value-actual generation power less than or equal to K, and if the power generation unit meeting the requirement is searched, entering the step S18; if no power generation unit meeting the requirement exists, the control of the current round is finished. Wherein K is a preset value not less than zero.
Step S18: increasing the control proportion of the power generation unit meeting the requirement, wherein the control proportion of the power generation unit is the power distribution value/P of the power generation unit target . Thereafter, the process returns to step S16.
Step S19: will P sum And P target -δ、P target + δ comparison size; if P sum ＜P target δ, go to step S20; if P sum ＞P target + δ, go to step S21; if P target -δ≤P sum ≤P target + δ, the present round of control is ended.
Step S20: and discharging the new energy power station according to the maximum power, and then finishing the control.
Step S21: and (5) performing power distribution of the new energy power station by adopting an equal margin distribution strategy, and then ending the current control.
Corresponding to the above method embodiment, the embodiment of the present invention further discloses a new energy power station, which includes a plurality of power generation units and a processor, as shown in fig. 4, the dashed line represents a communication link, and the solid line represents a cable; the processor is used for running a program, and when the processor runs the program, the following steps are realized:
when the new energy power station is in a power limiting state, acquiring target power P of the new energy power station target And the actual power P of the new energy power station sum And P target -δ、P target Comparing the + delta, wherein delta is a preset value not less than zero;
if P sum ＜P target Delta, performing power distribution of the new energy power station by adopting an equal margin distribution strategy;
if P sum ＞P target + δ, then: carrying out power distribution on the new energy power station by adopting an equal proportion distribution strategy; acquiring actual power P of the new energy power station under the equal proportion distribution strategy sum ', determine whether | P is satisfied sum '-P target S is not more than S, and S is a preset value not less than zero; if not, searching the power generation unit with the difference value between the power distribution value and the actual power being less than or equal to K in the new energy power station, and then increasing the control proportion of the power generation unit meeting the requirement until | P |, and finally, increasing the control proportion of the power generation unit meeting the requirement sum '-P target Stopping the execution of the judgment to determine whether | P is satisfied or not when | S ≦ S or there is no power generation unit satisfying the requirement sum '-P target A step of | ≦ S; wherein K is a preset value not less than zero, and the control ratio of the power generation unit is the power distribution value/P of the power generation unit target 。
Optionally, increasing the control ratio of the power generation unit meeting the requirement includes: increase the control ratio of the power generation unit satisfying this requirement
Figure BDA0002789201710000101
P nm Sum of the rated powers, P, of all the power generating units satisfying this requirement totalsum Is the sum of said differences for all power generating units not fulfilling this requirement.
Optionally, in the new energy power station, the performing power distribution of the new energy power station by using the equal margin distribution strategy includes:
allocating power to values
Figure BDA0002789201710000111
Sending to the ith power generation unit, and independently tracking power according to the power distribution value received by each power generation unit, P si The actual power of the ith power generation unit; alternatively, the ratio will be controlled
Figure BDA0002789201710000112
Sending the power to the ith power generation unit, and independently tracking the power of each power generation unit according to the control proportion received by each power generation unit, P Rated_i Is the rated power of the ith power generation unit.
Optionally, in any one of the new energy power stations disclosed above, the performing power distribution of the new energy power station by using an equal proportion distribution strategy includes:
allocating power to values
Figure BDA0002789201710000113
The power distribution value is sent to the ith power generation unit, and each power generation unit independently tracks power according to the power distribution value received by the power generation unit; alternatively, the ratio will be controlled
Figure BDA0002789201710000114
Sending the power to the ith power generation unit, and independently tracking the power of each power generation unit according to the control proportion received by each power generation unit, P Rated_i Is the rated power of the ith power generation unit.
Optionally, in any one of the new energy power stations disclosed above, when the processor runs the program, the following steps are further implemented:
when the new energy power station is in an unlimited power state: if P sum ＜P target Delta, outputting power by the new energy power station in a maximum power tracking mode; if P sum ＞P target And + delta, performing power distribution of the new energy power station by adopting an equal margin distribution strategy.
Optionally, in any one of the new energy power stations disclosed above, δ > 0, s > 0, and k > 0.
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 device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The terms "first," "second," and the like in the description and in the claims, and in the drawings, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. 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" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
For the system embodiment, since it basically corresponds to the method embodiment, the description is relatively simple, and for the relevant points, reference may be made to the partial description of the method embodiment. The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
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 embodiments. Thus, the present embodiments are not intended to be limited to the embodiments shown herein but are to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (12)

1. A power optimization distribution method for a new energy power station is characterized by comprising the following steps:
when the new energy power station is in a power limiting state, acquiring target power P of the new energy power station target And the actual power P of the new energy power station sum And P target -δ、P target Comparing the + delta, wherein delta is a preset value not less than zero;
if P sum ＜P target Delta, performing power distribution of the new energy power station by adopting an equal margin distribution strategy;
if P sum ＞P target + δ, then: new energy using equal proportion distribution strategyDistributing power of a source power station; acquiring actual power P of the new energy power station under the equal proportion distribution strategy sum ', determine whether | P is satisfied sum '-P target S is not more than S, and S is a preset value not less than zero; if not, searching the power generation unit with the difference value between the power distribution value and the actual power less than or equal to K in the new energy power station, and then increasing the control proportion of the power generation unit meeting the requirement until | P sum '-P target Stopping performing the determination whether | P is satisfied or not when | S ≦ or there is no power generation unit satisfying this requirement sum '-P target A step of | ≦ S; wherein K is a preset value not less than zero, and the control ratio of the power generation unit is the power distribution value/P of the power generation unit target 。
2. The optimal power distribution method for the new energy power station as claimed in claim 1, wherein the increasing of the control proportion of the power generation units meeting the requirement comprises: the control ratio of the power generation unit satisfying the requirement is increased
Figure FDA0002789201700000011
P nm The sum of the rated powers, P, of all the power generating units satisfying this requirement totalsum Is the sum of said differences for all power generating units not meeting this requirement.
3. The optimal power distribution method for the new energy power station as claimed in claim 1 or 2, wherein the power distribution for the new energy power station by adopting the equal margin distribution strategy comprises:
allocating power to values
Figure FDA0002789201700000012
Sending the power distribution values to the ith power generation unit, and independently tracking the power of each power generation unit according to the power distribution values received by each power generation unit, P si The actual power of the ith power generation unit; alternatively, the ratio will be controlled
Figure FDA0002789201700000013
Sending the power to the ith power generation unit, and independently tracking the power of each power generation unit according to the control proportion received by each power generation unit, P Rated_i Is the rated power of the ith power generation unit.
4. The optimal power distribution method for the new energy power station as claimed in claim 1 or 2, wherein the power distribution method for the new energy power station by adopting the equal proportion distribution strategy comprises the following steps:
allocating power to values
Figure FDA0002789201700000021
The power distribution value is sent to the ith power generation unit, and each power generation unit independently tracks power according to the power distribution value received by the power generation unit; alternatively, the ratio will be controlled
Figure FDA0002789201700000022
Sending the power to the ith power generation unit, and independently tracking the power of each power generation unit according to the control proportion received by each power generation unit, P Rated_i Is the rated power of the ith power generation unit.
5. The power optimized distribution method for the new energy power station as claimed in claim 1 or 2, characterized by further comprising:
when the new energy power station is in an unlimited power state: if P sum ＜P target Delta, outputting power by the new energy power station in a maximum power tracking mode; if P sum ＞P target And + delta, performing power distribution of the new energy power station by adopting an equal margin distribution strategy.
6. The optimal power distribution method for new energy plants according to claim 1 or 2, characterized in that δ > 0, s > 0, k > 0.
7. A new energy power station is characterized by comprising a plurality of power generation units and a processor; the processor is used for running a program, and when the processor runs the program, the following steps are realized:
when the new energy power station is in a power limiting state, acquiring target power P of the new energy power station target And the actual power P of the new energy power station sum And P target -δ、P target Comparing the + delta, wherein delta is a preset value not less than zero;
if P sum ＜P target Delta, performing power distribution of the new energy power station by adopting an equal margin distribution strategy;
if P sum ＞P target + δ, then: carrying out power distribution on the new energy power station by adopting an equal proportion distribution strategy; acquiring actual power P of the new energy power station under the equal proportion distribution strategy sum ', determine whether | P is satisfied sum '-P target S is not more than S, and S is a preset value not less than zero; if not, searching the power generation unit with the difference value between the power distribution value and the actual power less than or equal to K in the new energy power station, and then increasing the control proportion of the power generation unit meeting the requirement until | P sum '-P target Stopping performing the determination whether | P is satisfied or not when | S ≦ or there is no power generation unit satisfying this requirement sum '-P target A step of | ≦ S; wherein K is a preset value not less than zero, and the control ratio of the power generation unit is the power distribution value/P of the power generation unit target 。
8. The new energy plant of claim 7, characterized in that the increase of the control ratio of the power generating units meeting this requirement comprises: increase the control ratio of the power generation unit satisfying this requirement
Figure FDA0002789201700000031
P nm The sum of the rated powers, P, of all the power generating units satisfying this requirement totalsum Is the sum of said differences for all power generating units not meeting this requirement.
9. The new energy plant of claim 7 or 8, characterized in that the new energy plant power distribution using an equal margin distribution strategy comprises:
allocating power to values
Figure FDA0002789201700000032
Sending to the ith power generation unit, and independently tracking power according to the power distribution value received by each power generation unit, P si The actual power of the ith power generation unit; alternatively, the ratio will be controlled
Figure FDA0002789201700000033
Sending the power to the ith power generation unit, and independently tracking the power of each power generation unit according to the control proportion received by each power generation unit, P Rated_i Is the rated power of the ith power generation unit.
10. The new energy plant of claim 7 or 8, characterized in that the new energy plant power distribution using the equal proportion distribution strategy comprises:
allocating power to values
Figure FDA0002789201700000034
The power distribution value is sent to the ith power generation unit, and each power generation unit independently tracks power according to the power distribution value received by the power generation unit; alternatively, the ratio will be controlled
Figure FDA0002789201700000035
Sending the power to the ith power generation unit, and independently tracking the power of each power generation unit according to the control proportion received by each power generation unit, P Rated_i Is the rated power of the ith power generation unit.
11. The new energy plant of claim 7 or 8, characterized in that the processor, when running the program, further performs the steps of:
when the new energy power station is in an unlimited power state: if P sum ＜P target Delta, outputting power by the new energy power station in a maximum power tracking mode; if P sum ＞P target + delta, miningAnd performing power distribution of the new energy power station by using an equal margin distribution strategy.
12. The new energy plant of claim 7 or 8, characterized in that δ > 0, s > 0, k > 0.
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