CN113300394A - Renewable energy power station and control method thereof - Google Patents
Renewable energy power station and control method thereof Download PDFInfo
- Publication number
- CN113300394A CN113300394A CN202110579118.4A CN202110579118A CN113300394A CN 113300394 A CN113300394 A CN 113300394A CN 202110579118 A CN202110579118 A CN 202110579118A CN 113300394 A CN113300394 A CN 113300394A
- Authority
- CN
- China
- Prior art keywords
- power
- renewable energy
- power generation
- limit value
- equal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000010248 power generation Methods 0.000 claims abstract description 141
- 238000006243 chemical reaction Methods 0.000 claims abstract description 65
- 238000004146 energy storage Methods 0.000 claims abstract description 60
- 102100031786 Adiponectin Human genes 0.000 claims description 9
- 101000775469 Homo sapiens Adiponectin Proteins 0.000 claims description 9
- YRKCREAYFQTBPV-UHFFFAOYSA-N acetylacetone Chemical compound CC(=O)CC(C)=O YRKCREAYFQTBPV-UHFFFAOYSA-N 0.000 claims description 7
- HEZMWWAKWCSUCB-PHDIDXHHSA-N (3R,4R)-3,4-dihydroxycyclohexa-1,5-diene-1-carboxylic acid Chemical compound O[C@@H]1C=CC(C(O)=O)=C[C@H]1O HEZMWWAKWCSUCB-PHDIDXHHSA-N 0.000 claims description 6
- 238000013459 approach Methods 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000001186 cumulative effect Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 210000000352 storage cell Anatomy 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
-
- 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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
- H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
-
- 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
- H02J2300/24—The renewable source being solar energy of photovoltaic 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
- H02J2300/28—The renewable source being wind 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention provides a renewable energy power station and a control method thereof, wherein a renewable energy power generation device and an energy storage battery are respectively connected with a common bus through corresponding power conversion devices, and the common bus realizes continuous power output within a preset power fluctuation range through the corresponding power conversion devices. When the sum of the power of all the renewable energy power generation devices is less than or equal to the lower limit value of the preset power fluctuation range, setting a first minimum effective capacity to meet the continuous power output requirement of the power station in the lower limit value state; when the sum of the power of all the renewable energy power generation devices is larger than or equal to the upper limit value of the preset power fluctuation range, setting a second minimum effective capacity to meet the continuous power output requirement of the power station under the state of the upper limit value; furthermore, the effective capacity of the energy storage battery is only required to be larger than or equal to the sum of the two minimum effective capacities, so that the configuration cost of the energy storage battery is minimized under the condition that the energy storage battery meets the corresponding requirements.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to a renewable energy power station and a control method thereof.
Background
In recent years, the proportion of renewable energy sources such as photovoltaic and wind power in the power generation field is greatly increased, but the generated power of the renewable energy sources generally has the problem of large fluctuation (fig. 1a shows the fluctuation of the generated power of photovoltaic, and fig. 1b shows the fluctuation of the generated power of wind power), and along with the increase of the proportion, the high permeability has great influence on the safe and stable operation of a power grid.
Therefore, in the prior art, an energy storage battery is generally integrated with renewable energy power generation to store renewable energy power for a short time, so as to realize peak clipping and valley filling. For example, fig. 2 shows an actual power generation curve of a certain photovoltaic power storage station for 3 days, which realizes 24-hour stable power generation of the photovoltaic power storage station through an energy storage cell arranged on the direct current side of the photovoltaic system, and thoroughly solves the problems of light abandonment and large output power fluctuation.
However, in the photovoltaic power storage station, the photovoltaic capacity is designed by 7 times of the capacity ratio, and the capacity of the energy storage battery is more than 20 times of the ac output capacity per hour, so that the condition of stable output power for 24 hours shown in fig. 2 is ensured, which undoubtedly results in high-cost energy storage configuration.
Disclosure of Invention
In view of this, the present invention provides a renewable energy power station and a control method thereof, which can reduce the fluctuation of power output with lower energy storage cost.
In order to achieve the above purpose, the embodiments of the present invention provide the following technical solutions:
in a first aspect, the present invention provides a renewable energy power station, comprising: at least one renewable energy power generation device, at least one power conversion device and at least one energy storage battery; wherein:
the renewable energy power generation device and the energy storage battery are respectively connected with a common bus through corresponding power conversion devices;
the common bus realizes continuous power output within a preset power fluctuation range through a corresponding power conversion device;
the effective capacity of the energy storage battery is greater than or equal to the sum of the first minimum effective capacity and the second minimum effective capacity; when the sum of all the power of the renewable energy power generation devices is less than or equal to the lower limit value of the preset power fluctuation range, the first minimum effective capacity meets the continuous power output requirement of the renewable energy power station in the state of the lower limit value; and when the sum of all the power of the renewable energy power generation devices is greater than or equal to the upper limit value of the preset power fluctuation range, the second minimum effective capacity meets the continuous power output requirement of the renewable energy power station in the state of the upper limit value.
Optionally, the upper limit value is greater than or equal to the lower limit value.
Optionally, the renewable energy power generation device is: photovoltaic power generation devices or wind power generation devices.
Optionally, if the common bus is a dc bus, then:
the power conversion device of the photovoltaic power generation device is as follows: a DCDC converter, or a DCAC converter and an ACDC converter connected in series;
the power conversion device of the wind power generation device is as follows: the ACDC converter or the ACAC converter and the ACDC converter which are connected in series;
the power conversion device of the energy storage battery is as follows: a DCDC converter.
Optionally, if the common bus is an ac bus, then:
the power conversion device of the photovoltaic power generation device is as follows: a DCAC converter;
the power conversion device of the wind power generation device is as follows: an ACAC converter;
the power conversion device of the energy storage battery is as follows: a DCAC converter.
A second aspect of the present invention further provides a method for controlling a renewable energy power station, where the renewable energy power station is the renewable energy power station described in any of the above paragraphs of the first aspect; the control method of the renewable energy power station comprises the following steps:
determining the total power generation condition of all the renewable energy power generation devices according to the acquired real-time power generation power of each renewable energy power generation device in the renewable energy power station;
determining the residual capacity of an energy storage battery according to the acquired residual electric quantity SOC of the energy storage battery in the renewable energy power station;
and controlling each power conversion device in the renewable energy power station to operate according to the total power generation condition and the residual capacity, and performing peak clipping and valley filling on the residual capacity to enable the output power of the renewable energy power station to be within a preset power fluctuation range.
Optionally, determining the total power generation condition of all the renewable energy power generation devices according to the obtained real-time power generation power of each renewable energy power generation device in the renewable energy power station, includes:
comparing the sum of the real-time power generation power with an upper limit value and a lower limit value of the preset power fluctuation range respectively;
determining the total power generation condition as any one of the following: the sum of the real-time power generation powers is greater than or equal to the upper limit value, the sum of the real-time power generation powers is less than or equal to the lower limit value, and the sum of the real-time power generation powers is between the lower limit value and the upper limit value.
Optionally, determining the remaining capacity of the energy storage battery according to the obtained remaining power SOC of the energy storage battery in the renewable energy power station, includes:
and calculating according to the SOC and the effective capacity of the energy storage battery to obtain the residual capacity.
Optionally, controlling each power conversion device in the renewable energy power station to operate according to the total power generation condition and the residual capacity, and performing peak clipping and valley filling with the residual capacity to make the output power of the renewable energy power station within a preset power fluctuation range, including:
if the total power generation condition is that the sum of the real-time power generation powers is smaller than or equal to the lower limit value and the residual capacity is smaller than or equal to a first minimum effective capacity, controlling each power conversion device to operate and filling the valley with the residual capacity to enable the output power to be equal to the lower limit value;
if the total power generation condition is that the sum of the real-time power generation powers is larger than or equal to the upper limit value, and the residual capacity is larger than or equal to the first minimum effective capacity, the output power is equal to the upper limit value by controlling each power conversion device to operate and peak clipping with the residual capacity;
in other cases, the operation of each power conversion device is controlled so that the output power is equal to or higher than the lower limit value and equal to or lower than the upper limit value, and the SOC is adjusted in a direction in which the remaining capacity approaches the first minimum effective capacity.
Optionally, for another case, controlling each power conversion device to operate so that the output power is greater than or equal to the lower limit value and less than or equal to the upper limit value, and the SOC is adjusted in a direction in which the remaining capacity tends to the first minimum effective capacity includes:
if the total power generation condition is that the sum of the real-time power generation powers is smaller than or equal to the lower limit value and the residual capacity is larger than the first minimum effective capacity, controlling each power conversion device to operate to fill the valley with the residual capacity so that the output power is equal to the upper limit value until the residual capacity is reduced to be equal to the first minimum effective capacity;
if the total power generation condition is that the sum of the real-time power generation powers is larger than the lower limit value and the residual capacity is smaller than the first minimum effective capacity, controlling each power conversion device to operate, and performing peak clipping on the residual capacity to enable the output power to be equal to the sum of the real-time power generation powers until the residual capacity is increased to be equal to the first minimum effective capacity;
and if the total power generation condition is that the sum of the real-time power generation powers is between the upper limit value and the lower limit value, and the residual capacity is larger than the first minimum effective capacity, controlling each power conversion device to operate, filling the valley with the residual capacity, and enabling the output power to be equal to the upper limit value.
Optionally, before determining the total power generation condition of all the renewable energy power generation devices according to the obtained real-time power generation power of each renewable energy power generation device in the renewable energy power station, the method further includes:
and acquiring the real-time power generation power, the SOC and the real-time output power of the renewable energy power station.
Optionally, before obtaining each of the real-time power generation power, the SOC, and the real-time output power of the renewable energy power station, the method further includes:
and pre-charging the energy storage battery to enable the residual capacity to be increased to be equal to the first minimum effective capacity.
The renewable energy power station provided by the invention has the advantages that the renewable energy power generation device and the energy storage battery are respectively connected with the common bus through the corresponding power conversion devices; the common bus realizes continuous power output within a preset power fluctuation range through a corresponding power conversion device. When the sum of the power of all the renewable energy power generation devices is less than or equal to the lower limit value of the preset power fluctuation range, a first minimum effective capacity is set, so that the discharge of the energy storage battery can meet the continuous power output requirement of the renewable energy power station in the lower limit value state; when the sum of the power of all the renewable energy power generation devices is larger than or equal to the upper limit value of the preset power fluctuation range, setting a second minimum effective capacity so that the charging of the energy storage battery can meet the continuous power output requirement of the renewable energy power station in the state of the upper limit value; furthermore, the effective capacity of the energy storage battery is only required to be larger than or equal to the sum of the first minimum effective capacity and the second minimum effective capacity, so that the configuration cost of the energy storage battery is minimized under the condition that the corresponding requirements are met.
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 provided drawings without creative efforts.
FIG. 1a is a schematic diagram of the fluctuation of the generated power of a photovoltaic provided by the prior art;
FIG. 1b is a schematic diagram of power fluctuation of wind power provided by the prior art;
FIG. 2 is a three-day actual power generation curve of a photovoltaic power plant provided by the prior art;
fig. 3 is a schematic structural diagram of a renewable energy power station according to an embodiment of the present invention;
fig. 4 is a flowchart of a control method of a renewable energy power station according to an embodiment of the present invention;
fig. 5 is another flowchart of a control method of a renewable energy power station according to an embodiment of the present invention;
fig. 6 and fig. 7 are schematic diagrams of two power waveforms of the control method of the renewable energy power station provided by the embodiment of the invention under different preset power fluctuation range settings.
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.
In this application, 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 invention provides a renewable energy power station which can reduce the fluctuation of power output with lower energy storage cost.
As shown in fig. 3, the renewable energy power station includes: at least one renewable energy power generation device 10, at least one power conversion device (1, 2, 3, 4 as shown in fig. 3), and at least one energy storage battery 20; wherein:
the renewable energy power generation device 10 and the energy storage battery 20 are respectively connected with the common bus 30 through corresponding power conversion devices; as shown in fig. 3, different renewable energy power generation devices 10 are connected to a common bus 30 through respective matched power conversion devices (1 or 2 as shown in fig. 3), and the energy storage battery 20 is connected to the common bus 30 through the power conversion device 3.
The common bus 30 also realizes power output through the corresponding power conversion device 4, and the common bus connection between the renewable energy power generation device 10 and the energy storage battery 20 enables the energy storage battery 20 to cut peaks and fill valleys through charging and discharging, so that the renewable energy power station realizes continuous power output within a preset power fluctuation range through the power conversion device 4; the lower limit value of the preset power fluctuation range is marked as P1, the upper limit value is marked as P2, and then the preset power fluctuation range is [ P1, P2 ].
In order to reduce the cost of the energy storage configuration, the energy storage battery 20 should be configured with the minimum effective capacity as possible while achieving continuous power output within the above-mentioned preset power fluctuation range [ P1, P2 ]. In practical applications, the specific process for designing the minimum effective capacity of the energy storage battery 20 is as follows:
(1) determining the power fluctuation range of the continuous power output, namely the fluctuation range p 1-p 2 of the rated power output pn, 0 < p1 ≦ p2, such as: p1 ═ 20% pn, p2 ═ pn, p1 ═ 50% pn, p2 ═ pn, or other values, and even p1 ═ p 2.
(2) According to the operation condition and the economy of the renewable energy power generation device 10, determining the over-ratio of the maximum output power Pmax of all the renewable energy power generation devices 10, namely:
Pmax＝λpnpreferably, p isn≥Paverage；
Wherein λ is the super-proportion of all renewable energy power generation devices 10, and λ is greater than 1; paverageThe average generated power for all renewable energy power generation apparatuses 10; pmaxThe maximum value of the real-time generated power P of all the renewable energy power generation devices 10.
(3) According to the sum of the powers of all the renewable energy power generation devices 10, that is, the sum P of the real-time generated powers, it is determined that the time interval T1 when the cumulative power generation amount is equal to or less than the cumulative minimum continuity output (P1), that is, T1, should satisfy:
(4) determining a first minimum effective capacity E1 of the energy storage battery 20:
that is, when the sum P of the real-time generated powers of all the renewable energy power generation devices 10 is less than or equal to the lower limit P1 of the preset power fluctuation range, that is, P is less than or equal to P1, the first minimum effective capacity E1 can satisfy the continuous power output requirement of the renewable energy power station in the lower limit state.
(5) According to the sum P of the real-time generated powers of all the renewable energy power generation devices 10, it is determined that the time interval T2 when the integrated power generation amount is equal to or greater than the integrated maximum continuity output (P2), that is, T2, should satisfy:
(6) determining a second minimum effective capacity E2 of the energy storage battery 20:
that is, when the sum P of the real-time generated powers of all the renewable energy power generation devices 10 is greater than or equal to the upper limit P2 of the preset power fluctuation range, that is, P is greater than or equal to P2, the second minimum effective capacity E2 can satisfy the continuous power output requirement of the renewable energy power station in the upper limit state.
(7) Determining the effective capacity of the energy storage battery: e is more than or equal to E1+ E2. That is, the effective capacity E of the energy storage battery 20 is equal to or greater than the sum of the first minimum effective capacity E1 and the second minimum effective capacity E2.
Therefore, the renewable energy power station provided by the embodiment can not only realize continuous power output within the preset power fluctuation range, but also enable the effective capacity of the energy storage battery 20 to be larger than or equal to the sum of the first minimum effective capacity E1 and the second minimum effective capacity E2 by setting the first minimum effective capacity E1 and the second minimum effective capacity E2, so as to minimize the configuration cost of the energy storage battery 20 under the condition of meeting the corresponding requirements.
It should be noted that, for the renewable energy power station provided in the previous embodiment, the renewable energy power generation device 10 may be the one shown in fig. 3: photovoltaic power generation devices or wind power generation devices.
For each power conversion device selected, if the common bus 30 is a dc bus: the power conversion device 1 of the photovoltaic power generation device is: a DCDC converter, or a DCAC converter and an ACDC converter connected in series; the power conversion device 2 of the wind power generation device is: the ACDC converter or the ACAC converter and the ACDC converter which are connected in series; the power conversion device 3 of the energy storage battery 20 is: a DCDC converter; the power conversion device for realizing continuous power output is as follows: DCAC converter to implement grid connection and/or supply power to load.
If the common bus 30 is an ac bus, then: the power conversion device 1 of the photovoltaic power generation device is a DCAC converter; the power conversion device 2 of the wind power generation device is an ACAC converter; the power conversion device 3 of the energy storage battery 20 is a DCAC converter; the power conversion device that realizes continuous power output is an ACAC converter.
In practical application, each power conversion device is specifically a single-stage conversion device or a two-stage conversion device, and an isolated topology or a non-isolated topology can be adopted according to the application environment, and is not limited herein, so that the reference to the prior art can be made, and the protection scope of the present application is all within the protection scope of the present application.
The rest of the arrangements and the principles thereof are the same as those of the previous embodiment, and are not described in detail here.
Another embodiment of the present invention further provides a method for controlling a renewable energy power station, where the renewable energy power station is the renewable energy power station according to any of the embodiments described above, and the structure and the setting principle of the renewable energy power station are as described in the embodiments described above, and are not described in detail.
Referring to fig. 4, the control method of the renewable energy power station includes:
s101, determining the total power generation condition of all renewable energy power generation devices according to the acquired real-time power generation power of each renewable energy power generation device in the renewable energy power station.
The method specifically comprises the following steps:
(1) and comparing the sum P of all the real-time power generation powers with an upper limit value P2 and a lower limit value P1 of a preset power fluctuation range respectively.
(2) Determining the total power generation condition as any one of the following conditions: the sum P of the real-time generated powers is greater than or equal to an upper limit value P2, the sum P of the real-time generated powers is less than or equal to a lower limit value P1, and the sum of the real-time generated powers is between the lower limit value P1 and the upper limit value P2.
That is, the total power generation condition can represent the sum P of the real-time power generation powers of the current renewable energy devices, and whether the sum P can meet the requirement of a preset power fluctuation range [ P1, P2] specifically includes: p is less than or equal to P1, P1 is less than P < P2, and P is more than or equal to P2.
S102, determining the residual capacity of the energy storage battery according to the obtained residual electric quantity SOC of the energy storage battery in the renewable energy power station.
In practical application, the remaining capacity SOC E can be obtained by calculation, i.e., multiplication, according to the SOC and the effective capacity E of the energy storage battery.
S103, controlling each power conversion device in the renewable energy power station to operate according to the total power generation condition and the residual capacity, and performing peak clipping and valley filling on the residual capacity to enable the output power of the renewable energy power station to be within a preset power fluctuation range.
The method specifically comprises the following three conditions:
(1) and if the total power generation condition is that the sum P of the real-time power generation powers is less than or equal to the lower limit value P1, and the residual capacity SOC E is less than or equal to the first minimum effective capacity E1, controlling the operation of each power conversion device, and filling the valley with the residual capacity SOC E to enable the output power to be equal to the lower limit value P1.
(2) And if the total power generation condition is that the sum P of the real-time power generation powers is greater than or equal to an upper limit value P2, and the residual capacity SOC E is greater than or equal to a first minimum effective capacity E1, controlling each power conversion device to operate, and cutting the peak by the residual capacity SOC E to enable the output power to be equal to the upper limit value P2.
(3) In other cases, the operation of each power conversion device is controlled so that the output power is equal to or higher than lower limit value P1 and equal to or lower than upper limit value P2, and the SOC is adjusted in such a direction that remaining capacity SOC × E approaches first minimum effective capacity E1.
For the case (3), the following is specifically divided:
a. and if the total power generation condition is that the sum P of the real-time power generation powers is less than or equal to the lower limit value P1 and the residual capacity SOC is greater than the first minimum effective capacity E1, controlling the operation of each power conversion device, filling the valley with the residual capacity SOC E, and enabling the output power to be equal to the upper limit value P2 until the residual capacity SOC is reduced to be equal to the first minimum effective capacity E1.
b. And if the total power generation condition is that the sum P of the real-time power generation powers is larger than the lower limit value P1 and the residual capacity SOC E is smaller than the first minimum effective capacity E1, controlling each power conversion device to operate, and cutting the peak by the residual capacity SOC E to enable the output power to be equal to the sum P of the real-time power generation powers until the residual capacity SOC E rises to be equal to the first minimum effective capacity E1.
In this case, in practical use, it is preferable that P satisfy the output power P in priority, and when P is increased to P2, it is sufficient to satisfy E1.
c. And if the total power generation condition is that the sum P of the real-time power generation powers is between an upper limit value P2 and a lower limit value P1, and the residual capacity SOC E is larger than the first minimum effective capacity E1, controlling each power conversion device to operate, and filling the valley with the residual capacity SOC E to ensure that the output power is equal to the upper limit value P2.
In practical applications, the control method may refer to fig. 5, which further includes, before executing step S101:
s201, acquiring each real-time power generation power, SOC and real-time output power of the renewable energy power station.
Before step S201, the method further includes:
s301, pre-charging the energy storage battery to enable the residual capacity to be equal to the first minimum effective capacity.
In summary, a most preferable control method specifically includes:
s1: the remaining capacity in the storage battery is precharged to E1.
S2: and determining the sum P of the real-time power generation power of the renewable energy power generation device, and acquiring the remaining capacity SOC and the real-time output power P of the energy storage battery.
S3: and when P is less than or equal to P1 and SOC is less than or equal to E1, controlling the output power P to be P1.
S4: and when P is more than or equal to P2 and SOC is more than or equal to E1, controlling the output power P to be P2.
S5: otherwise, the output power p is controlled by PID regulation with E1 as the target value, and p1 is not less than p not more than p2, so that the residual capacity of the energy storage battery is maintained near E1.
Taking the renewable energy device as a photovoltaic power generation device as an example, fig. 6 and 7 show power waveforms under two specific settings of a preset power fluctuation range [ P1, P2], respectively, where the case shown in fig. 6 is: p1 ═ 0.2pn ═ 0.4MW, p2 ═ 2MW, Pmax ═ 3.295pn ═ 6.59MW, E ═ 40 MWh; the situation shown in fig. 7 is: p1 ═ p2 ═ pn. The situation under other settings of the preset power fluctuation range [ P1, P2] can be analogized and is not shown one by one.
Compared with the prior art, the control method realizes that the renewable energy power station continuously outputs renewable energy power to the outside for 24 hours on the premise of the minimum capacity of the energy storage battery, and solves the problems of light abandonment and large output power fluctuation.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, the system or system embodiments are substantially similar to the method embodiments and therefore are described in a relatively simple manner, and reference may be made to some of the descriptions of the method embodiments for related points. The above-described system and system embodiments are only illustrative, wherein the units described as separate parts may or may not be physically separate, and the 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.
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.
In the above description of the disclosed embodiments, the features described in the embodiments in this specification may be replaced or combined with each other to enable those skilled in the art to make or use the 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 (12)
1. A renewable energy power station, comprising: at least one renewable energy power generation device, at least one power conversion device and at least one energy storage battery; wherein:
the renewable energy power generation device and the energy storage battery are respectively connected with a common bus through corresponding power conversion devices;
the common bus realizes continuous power output within a preset power fluctuation range through a corresponding power conversion device;
the effective capacity of the energy storage battery is greater than or equal to the sum of the first minimum effective capacity and the second minimum effective capacity; when the sum of all the power of the renewable energy power generation devices is less than or equal to the lower limit value of the preset power fluctuation range, the first minimum effective capacity meets the continuous power output requirement of the renewable energy power station in the state of the lower limit value; and when the sum of all the power of the renewable energy power generation devices is greater than or equal to the upper limit value of the preset power fluctuation range, the second minimum effective capacity meets the continuous power output requirement of the renewable energy power station in the state of the upper limit value.
2. The station of claim 1 wherein the upper limit is greater than or equal to the lower limit.
3. The renewable energy power plant of claim 1, wherein the renewable energy power plant is: photovoltaic power generation devices or wind power generation devices.
4. A plant as claimed in claim 3, characterised in that said common bus is a dc bus, then:
the power conversion device of the photovoltaic power generation device is as follows: a DCDC converter, or a DCAC converter and an ACDC converter connected in series;
the power conversion device of the wind power generation device is as follows: the ACDC converter or the ACAC converter and the ACDC converter which are connected in series;
the power conversion device of the energy storage battery is as follows: a DCDC converter.
5. A plant as claimed in claim 3, characterised in that said common bus is an ac bus, then:
the power conversion device of the photovoltaic power generation device is as follows: a DCAC converter;
the power conversion device of the wind power generation device is as follows: an ACAC converter;
the power conversion device of the energy storage battery is as follows: a DCAC converter.
6. A control method of a renewable energy power station, characterized in that the renewable energy power station is a renewable energy power station according to any one of claims 1-5; the control method of the renewable energy power station comprises the following steps:
determining the total power generation condition of all the renewable energy power generation devices according to the acquired real-time power generation power of each renewable energy power generation device in the renewable energy power station;
determining the residual capacity of an energy storage battery according to the acquired residual electric quantity SOC of the energy storage battery in the renewable energy power station;
and controlling each power conversion device in the renewable energy power station to operate according to the total power generation condition and the residual capacity, and performing peak clipping and valley filling on the residual capacity to enable the output power of the renewable energy power station to be within a preset power fluctuation range.
7. The method for controlling the renewable energy power station according to claim 6, wherein determining the total power generation condition of all the renewable energy power generation devices according to the acquired real-time power generation power of each renewable energy power generation device in the renewable energy power station comprises:
comparing the sum of the real-time power generation power with an upper limit value and a lower limit value of the preset power fluctuation range respectively;
determining the total power generation condition as any one of the following: the sum of the real-time power generation powers is greater than or equal to the upper limit value, the sum of the real-time power generation powers is less than or equal to the lower limit value, and the sum of the real-time power generation powers is between the lower limit value and the upper limit value.
8. The method for controlling the renewable energy power station according to claim 7, wherein determining the remaining capacity of the energy storage battery according to the obtained remaining capacity SOC of the energy storage battery in the renewable energy power station comprises:
and calculating according to the SOC and the effective capacity of the energy storage battery to obtain the residual capacity.
9. The method for controlling a renewable energy power station according to claim 8, wherein the step of controlling each power conversion device in the renewable energy power station to operate according to the total power generation condition and the residual capacity, and the peak clipping and valley filling are performed according to the residual capacity so that the output power of the renewable energy power station is within a preset power fluctuation range comprises the following steps:
if the total power generation condition is that the sum of the real-time power generation powers is smaller than or equal to the lower limit value and the residual capacity is smaller than or equal to a first minimum effective capacity, controlling each power conversion device to operate and filling the valley with the residual capacity to enable the output power to be equal to the lower limit value;
if the total power generation condition is that the sum of the real-time power generation powers is larger than or equal to the upper limit value, and the residual capacity is larger than or equal to the first minimum effective capacity, the output power is equal to the upper limit value by controlling each power conversion device to operate and peak clipping with the residual capacity;
in other cases, the operation of each power conversion device is controlled so that the output power is equal to or higher than the lower limit value and equal to or lower than the upper limit value, and the SOC is adjusted in a direction in which the remaining capacity approaches the first minimum effective capacity.
10. The method of controlling a renewable energy power station according to claim 9, wherein the other cases in which the output power is adjusted in a direction in which the remaining capacity approaches the first minimum effective capacity while the SOC is adjusted in a direction in which the output power is equal to or higher than the lower limit value and equal to or lower than the upper limit value by controlling operation of each power conversion device include:
if the total power generation condition is that the sum of the real-time power generation powers is smaller than or equal to the lower limit value and the residual capacity is larger than the first minimum effective capacity, controlling each power conversion device to operate to fill the valley with the residual capacity so that the output power is equal to the upper limit value until the residual capacity is reduced to be equal to the first minimum effective capacity;
if the total power generation condition is that the sum of the real-time power generation powers is larger than the lower limit value and the residual capacity is smaller than the first minimum effective capacity, controlling each power conversion device to operate, and performing peak clipping on the residual capacity to enable the output power to be equal to the sum of the real-time power generation powers until the residual capacity is increased to be equal to the first minimum effective capacity;
and if the total power generation condition is that the sum of the real-time power generation powers is between the upper limit value and the lower limit value, and the residual capacity is larger than the first minimum effective capacity, controlling each power conversion device to operate, filling the valley with the residual capacity, and enabling the output power to be equal to the upper limit value.
11. The method for controlling a renewable energy power station according to any one of claims 6 to 10, further comprising, before determining the total power generation situation of all the renewable energy power generation devices according to the acquired real-time power generation power of each renewable energy power generation device in the renewable energy power station:
and acquiring the real-time power generation power, the SOC and the real-time output power of the renewable energy power station.
12. The method for controlling a renewable energy power plant according to claim 11, further comprising, before obtaining each of said real-time generated power, said SOC, and said real-time output power of said renewable energy power plant:
and pre-charging the energy storage battery to enable the residual capacity to be increased to be equal to the first minimum effective capacity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110579118.4A CN113300394B (en) | 2021-05-26 | 2021-05-26 | Renewable energy power station and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110579118.4A CN113300394B (en) | 2021-05-26 | 2021-05-26 | Renewable energy power station and control method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113300394A true CN113300394A (en) | 2021-08-24 |
| CN113300394B CN113300394B (en) | 2024-08-02 |
Family
ID=77325214
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110579118.4A Active CN113300394B (en) | 2021-05-26 | 2021-05-26 | Renewable energy power station and control method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113300394B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102355008A (en) * | 2011-09-29 | 2012-02-15 | 沈阳工业大学自控技术研究所 | Control device and method for stabilizing power fluctuation of wind power field |
| CN103580044A (en) * | 2013-10-17 | 2014-02-12 | 华中科技大学 | Capacity allocation method of multi-wind power plant energy storage device for dealing with wind power fluctuation |
| WO2019078419A1 (en) * | 2017-10-18 | 2019-04-25 | 한국전력공사 | Power supply and demand operation scheduling apparatus and method, and computer program |
-
2021
- 2021-05-26 CN CN202110579118.4A patent/CN113300394B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102355008A (en) * | 2011-09-29 | 2012-02-15 | 沈阳工业大学自控技术研究所 | Control device and method for stabilizing power fluctuation of wind power field |
| CN103580044A (en) * | 2013-10-17 | 2014-02-12 | 华中科技大学 | Capacity allocation method of multi-wind power plant energy storage device for dealing with wind power fluctuation |
| WO2019078419A1 (en) * | 2017-10-18 | 2019-04-25 | 한국전력공사 | Power supply and demand operation scheduling apparatus and method, and computer program |
Non-Patent Citations (2)
| Title |
|---|
| 伦振坚;胡轲;郭金川;郭芳;: "微电网中电池储能系统的容量优化配置方法研究", 南方能源建设, no. 1, 30 December 2015 (2015-12-30), pages 5 - 9 * |
| 杨秀;陈洁;朱兰;张美霞;王海波;: "基于经济调度的微网储能优化配置", 电力系统保护与控制, no. 01, 1 January 2013 (2013-01-01), pages 53 - 60 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113300394B (en) | 2024-08-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Kotb et al. | Enriching the stability of solar/wind DC microgrids using battery and superconducting magnetic energy storage based fuzzy logic control | |
| Garcia et al. | Optimal energy management system for stand-alone wind turbine/photovoltaic/hydrogen/battery hybrid system with supervisory control based on fuzzy logic | |
| Liang et al. | Coordination control of hybrid AC/DC microgrid | |
| Tidjani et al. | Optimization of standalone microgrid considering active damping technique and smart power management using fuzzy logic supervisor | |
| CN112803505B (en) | Distributed voltage source converter cooperative control method and alternating current-direct current parallel-serial micro-grid | |
| CN103986190A (en) | Wind and solar storage combining power generation system smooth control method based on power generation power curves | |
| Ahamed et al. | Modelling and simulation of a solar PV and battery based DC microgrid system | |
| JP5541982B2 (en) | DC power distribution system | |
| Kathiresan et al. | Energy management of distributed renewable energy sources for residential DC microgrid applications | |
| Jou et al. | Operation strategy for a lab-scale grid-connected photovoltaic generation system integrated with battery energy storage | |
| Mobarrez et al. | Implementation of distributed power balancing strategy with a layer of supervision in a low-voltage DC microgrid | |
| CN106159980B (en) | Power generation system and energy management method | |
| Doshi et al. | Analysis of a wind-PV battery hybrid renewable energy system for a dc microgrid | |
| Samson et al. | Optimal load sharing strategy in a hybrid power system based on pv/fuel cell/battery/supercapacitor | |
| CN109888845B (en) | AC/DC hybrid micro-grid | |
| Barreto et al. | Single-stage topologies integrating battery charging, high voltage step-up and photovoltaic energy extraction capabilities | |
| Punna et al. | Optimum design and analysis of a dynamic energy management scheme for HESS in renewable power generation applications | |
| Müller et al. | Bidirectional partial power converter interface for energy storage systems to provide peak shaving in grid-tied PV plants | |
| Sinha et al. | Solar PV fed standalone DC microgrid with hybrid energy storage system | |
| Varghese et al. | Energy storage management of hybrid solar/wind standalone system using adaptive neuro‐fuzzy inference system | |
| Chauhan et al. | Controller design and stability analysis of grid connected DC microgrid | |
| Dhara et al. | A Novel Voltage-Zone based power management scheme for PV-Battery based Standalone System | |
| Lashab et al. | A low-computational high-performance model predictive control of single phase battery assisted Quasi Z-source PV inverters | |
| Wu et al. | Solar power generation system with power smoothing function | |
| CN106786803A (en) | Independent operating photovoltaic generating system is for more than a kind of lossless power-balance method for taking |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20220804 Address after: 230000 room 616, Baiyan Industrial Service Center, 188 Mingchuan Road, high tech Zone, Hefei, Anhui Province Applicant after: Sunshine Hydrogen Energy Technology Co.,Ltd. Address before: 230088 No. 1699 Xiyou Road, Hefei High-tech Zone, Anhui Province Applicant before: SUNGROW POWER SUPPLY Co.,Ltd. |
|
| TA01 | Transfer of patent application right | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |