CN113937750A - Wind-solar-storage complementary distributed energy power generation system and control method thereof - Google Patents
Wind-solar-storage complementary distributed energy power generation system and control method thereof Download PDFInfo
- Publication number
- CN113937750A CN113937750A CN202111223951.1A CN202111223951A CN113937750A CN 113937750 A CN113937750 A CN 113937750A CN 202111223951 A CN202111223951 A CN 202111223951A CN 113937750 A CN113937750 A CN 113937750A
- Authority
- CN
- China
- Prior art keywords
- energy
- battery
- wind
- voltage
- power generation
- 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.)
- Pending
Links
- 238000010248 power generation Methods 0.000 title claims abstract description 51
- 238000000034 method Methods 0.000 title claims abstract description 27
- 230000000295 complement effect Effects 0.000 title claims abstract description 18
- 238000004146 energy storage Methods 0.000 claims abstract description 67
- 239000000446 fuel Substances 0.000 claims abstract description 43
- 230000005611 electricity Effects 0.000 claims abstract description 12
- 239000013598 vector Substances 0.000 claims description 45
- BNOODXBBXFZASF-UHFFFAOYSA-N [Na].[S] Chemical group [Na].[S] BNOODXBBXFZASF-UHFFFAOYSA-N 0.000 claims description 41
- 238000007600 charging Methods 0.000 claims description 31
- 238000007599 discharging Methods 0.000 claims description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 238000010277 constant-current charging Methods 0.000 claims description 10
- 239000012528 membrane Substances 0.000 claims description 9
- 238000010280 constant potential charging Methods 0.000 claims description 6
- 230000014509 gene expression Effects 0.000 claims description 2
- 238000011217 control strategy Methods 0.000 abstract description 8
- 229910052739 hydrogen Inorganic materials 0.000 description 16
- 239000001257 hydrogen Substances 0.000 description 16
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 15
- 208000028659 discharge Diseases 0.000 description 13
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 12
- 229910052760 oxygen Inorganic materials 0.000 description 12
- 239000001301 oxygen Substances 0.000 description 12
- 230000008901 benefit Effects 0.000 description 10
- 230000009471 action Effects 0.000 description 8
- 230000008569 process Effects 0.000 description 8
- 238000005868 electrolysis reaction Methods 0.000 description 7
- 238000007726 management method Methods 0.000 description 7
- 239000003054 catalyst Substances 0.000 description 6
- 230000006872 improvement Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 230000002035 prolonged effect Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 206010033799 Paralysis Diseases 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 238000010281 constant-current constant-voltage charging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- -1 hydrogen ions Chemical class 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 239000002699 waste material Substances 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
- H02J1/00—Circuit arrangements for DC mains or DC distribution networks
- H02J1/10—Parallel operation of DC sources
-
- 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
- H02J1/00—Circuit arrangements for DC mains or DC distribution networks
- H02J1/14—Balancing the load in a network
-
- 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
- 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
-
- 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
- H02J2300/30—The power source being a fuel cell
-
- 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
- H02J2300/40—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation wherein a plurality of decentralised, dispersed or local energy generation technologies are operated simultaneously
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
本发明公开了一种风光储互补的分布式能源发电系统及其控制方法，所述系统包括：风力发电装置，用于利用风能发电，输出交流电；光能发电装置，用于利用光能发电，输出直流电；储能装置，用于当直流母线上电压高于额定电压时，储存电能以吸收多余电量；用于当直流母线上电压低于额定电压时，释放电能以维持直流母线上电压的稳定；其中，储能装置采用蓄电池和燃料电池混合储能方式。本发明在充分利用风能和光能时间和空间上的互补性的同时，加入了储能装置以解决风能和光能输出功率的随机性和间歇性，能够为新能源并网提供可靠、安全的控制策略。
The invention discloses a wind-solar-storage complementary distributed energy power generation system and a control method thereof. The system comprises: a wind power generation device, which is used for generating electricity by using wind energy and outputs alternating current; Output DC power; energy storage device, used to store electric energy to absorb excess power when the voltage on the DC bus is higher than the rated voltage; used to release the electric energy to maintain the stability of the voltage on the DC bus when the voltage on the DC bus is lower than the rated voltage ; Among them, the energy storage device adopts the hybrid energy storage mode of battery and fuel cell. The invention makes full use of the complementarity of wind energy and light energy in time and space, and adds an energy storage device to solve the randomness and intermittency of the output power of wind energy and light energy, and can provide a reliable and safe control strategy for the grid connection of new energy. .
Description
Technical Field
The invention belongs to the technical field of new energy complementary power generation control, and particularly relates to a wind-solar-storage complementary distributed energy power generation system and a control method thereof.
Background
The renewable energy source is greatly different from the traditional generator set, and mainly the power output of the renewable energy source is an uncertain quantity; the wind energy and the sun have the characteristics of randomness and intermittence, and if the wind energy and the sun are directly connected to the power grid, the load of the power grid is unbalanced, even the power system is paralyzed, and the market power supply cannot be continuously provided. With the growing development of renewable energy sources, the impact of renewable energy source grid connection on a power grid is increasing, and the grid connection is very difficult due to the volatility and the difficult predictability of the renewable energy sources. At present, the bottleneck restricting the large-scale application of photovoltaic power generation and wind power generation is the reliability besides the economy.
As is known, solar energy and wind energy have strong complementarity in time, the wind power is small when the sunlight is strong in the daytime, and the wind energy is increased due to large temperature difference at night; the sunshine is strong in summer and the wind is small, the sunshine is weak in winter, the wind energy is increased, and the solar energy and the wind energy have strong complementarity in time. In space, in order to avoid the wake effect between fans, the fans are far away from installation, so that the waste of field resources is caused; in order to solve the problem, a photovoltaic cell panel can be arranged between the fans, on one hand, more electric energy is generated, and on the other hand, the solved land resource is wasted.
In the existing complementary technical scheme, although solar energy and wind energy have complementarity in time and space, the fluctuation of power is stabilized to a certain extent; however, when the wind power generation system is incorporated into a power grid, part of peak power fluctuation still exists, and a novel wind power generation, photovoltaic power generation and energy storage complementary distributed energy generation system and an energy management control strategy thereof are needed.
Disclosure of Invention
The invention aims to provide a wind-solar-storage-complementary distributed energy power generation system and a control method thereof, so as to solve one or more technical problems. On one hand, the invention adds an energy storage device to solve the randomness and intermittency of the output power of wind energy and light energy while fully utilizing the complementarity of the wind energy and the light energy in time and space; on the other hand, the invention provides an energy management method of the energy storage device, which can provide a reliable and safe control strategy for new energy grid connection.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention relates to a wind-solar-storage complementary distributed energy power generation system, which comprises:
the wind power generation device is used for generating power by utilizing wind energy and outputting alternating current;
the AC/DC rectifier is used for rectifying the alternating current output by the wind power generation device into direct current and then transmitting the direct current to the direct current bus;
the light energy power generation device is used for generating power by utilizing light energy and outputting direct current;
the DC/DC converter is used for converting the direct current output by the optical energy generating device into a voltage grade consistent with the voltage of the direct current bus and then transmitting the voltage grade to the direct current bus;
the energy storage device is used for storing electric energy to absorb redundant electric quantity when the voltage on the direct current bus is higher than the rated voltage; when the voltage on the direct current bus is lower than the rated voltage, releasing the electric energy to maintain the stability of the voltage on the direct current bus; the energy storage device adopts a storage battery and fuel cell hybrid energy storage mode.
A further improvement of the invention is that the optical energy generation device comprises a photovoltaic cell array; the wind power generation device comprises a plurality of wind turbines; the photovoltaic cell array is arranged among the plurality of wind turbines.
The invention has the further improvement that the discharging step of the energy storage device adopting a storage battery and fuel cell hybrid energy storage mode specifically comprises the following steps:
(1) selecting a storage battery from the vector group A, finishing the first-stage discharging when the discharging state is a first preset threshold, marking the storage battery finishing the first-stage discharging in the vector group B, and skipping to execute the step (2); wherein the vector group A is obtained based on a battery pre-label before discharging;
(2) judging whether the vector group A is an empty set, if not, skipping to execute the step (1), and if so, skipping to execute the step (3);
(3) selecting a storage battery from the vector group B, finishing the second-stage discharging when the discharging state is a second preset threshold, removing the storage battery finishing the second-stage discharging from the vector group B, and skipping to execute the step (4);
(4) judging whether the vector group B is an empty set, if not, skipping to execute the step (3), and if so, skipping to execute the step (5) or skipping to execute the step (6);
(5) outputting the information that the storage battery finishes discharging;
(6) fuel cell discharge is initiated.
In a further development of the invention, the first predetermined threshold value is 60%; the second preset threshold is 30%.
The further improvement of the invention is that the charging step of the energy storage device adopting a storage battery and fuel cell hybrid energy storage mode specifically comprises the following steps:
the storage battery absorbs the surplus electric quantity and stores the electric energy; after the charging capacity of the storage battery reaches the upper limit, the fuel cell consumes redundant electric energy in a water electrolysis mode;
wherein, the battery absorbs unnecessary electric quantity, and the step of storing electric energy specifically includes: a constant-current charging mode is adopted, and when the charging reaches a preset capacity threshold value, a constant-voltage charging mode is adopted.
A further development of the invention is that the battery is a sodium-sulfur battery; the expressions of the state of charge SOC and the depth of discharge DOD in the charging and discharging of the sodium-sulfur storage battery are respectively as follows:
in the formula, Ebat(t) represents the remaining capacity in the sodium-sulfur battery at time t; ebat,capRepresents the capacity of a sodium-sulfur battery.
In a further improvement of the invention, the fuel cell is a proton exchange membrane fuel cell.
The invention discloses a control method of a wind-solar-storage complementary distributed energy power generation system, which comprises the following steps of:
acquiring the voltage of a direct current bus;
when the voltage of the direct current bus is higher than the rated voltage, the energy storage device stores electric energy to absorb redundant electric quantity;
when the voltage of the direct current bus is lower than the rated voltage, the energy storage device releases electric energy to maintain the stability of the voltage on the direct current bus.
In a further improvement of the present invention, the step of storing the electric energy by the energy storage device to absorb the surplus electric energy specifically comprises:
the storage battery absorbs the surplus electric quantity and stores the electric energy; after the charging capacity of the storage battery reaches the upper limit, the fuel cell consumes redundant electric energy in a water electrolysis mode;
wherein, the battery absorbs unnecessary electric quantity, and the step of storing electric energy specifically includes: a constant-current charging mode is adopted, and when the charging reaches a preset capacity threshold value, a constant-voltage charging mode is adopted.
In a further improvement of the present invention, the step of releasing the electric energy from the energy storage device to maintain the voltage on the dc bus stable specifically comprises:
(1) selecting a storage battery from the vector group A, finishing the first-stage discharging when the discharging state is a first preset threshold, marking the storage battery finishing the first-stage discharging in the vector group B, and skipping to execute the step (2); wherein the vector group A is obtained based on a battery pre-label before discharging;
(2) judging whether the vector group A is an empty set, if not, skipping to execute the step (1), and if so, skipping to execute the step (3);
(3) selecting a storage battery from the vector group B, finishing the second-stage discharging when the discharging state is a second preset threshold, removing the storage battery finishing the second-stage discharging from the vector group B, and skipping to execute the step (4);
(4) judging whether the vector group B is an empty set, if not, skipping to execute the step (3), and if so, skipping to execute the step (5) or skipping to execute the step (6);
(5) outputting the information that the storage battery finishes discharging;
(6) fuel cell discharge is initiated.
Compared with the prior art, the invention has the following beneficial effects:
compared with the traditional distributed energy power generation system, the distributed energy power generation system has the advantages that the complementation of wind energy and light energy in time and space is fully utilized in the form, the energy storage device is arranged, and the energy storage device adopts a storage battery and fuel cell hybrid energy storage mode, so that the randomness and the intermittence of the output power of the wind energy and the light energy can be solved.
In the invention, an energy management control strategy is further provided innovatively, and the classified utilization of storage battery energy storage and fuel cell energy storage can be realized.
The invention further provides a constant-current and constant-voltage charging mode of the storage battery, and the service life of the storage battery can be prolonged.
In the invention, the energy storage device adopts a mixed energy storage mode of a sodium-sulfur storage battery and a fuel cell, and the sodium-sulfur storage battery has the advantages of long cycle life, high energy density, suitability for power type energy storage and energy type energy storage, high charging and discharging efficiency, benefit for power generation load regulation and load translation of renewable energy sources and the like. When the voltage on the direct current bus is higher than the rated voltage, the sodium-sulfur storage battery firstly absorbs the redundant electric quantity and stores the electric energy; when the voltage on the direct current bus is lower than the rated voltage, the energy storage device releases electric energy to maintain the stability of the voltage on the direct current bus.
In the invention, the fuel cell adopts a proton exchange membrane fuel cell, and when the electric quantity on the direct current bus is excessive, hydrogen and oxygen are generated in a water electrolysis mode; when the direct current bus is short of power supply, hydrogen and oxygen enter the fuel cell and release electric energy under the action of the catalyst, so that the short of power supply on the direct current bus is made up.
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 are briefly introduced below; it is obvious that the drawings in the following description are some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
FIG. 1 is a schematic block diagram of a wind-solar-storage hybrid distributed energy generation system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a sodium-sulfur battery charging process according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of the discharge process of a sodium-sulfur battery in an embodiment of the present invention;
fig. 4 is a schematic diagram of the constant voltage-constant current charging characteristics of the sodium-sulfur storage battery in the embodiment of the invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, 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.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention is described in further detail below with reference to the accompanying drawings:
the wind-solar-storage-complementary distributed energy power generation system comprises: wind power generation devices, photovoltaic power generation devices, energy storage devices, direct current buses, direct current loads, alternating current loads, DC/DC converters, AC/DC rectifiers, DC/AC inverters and the like.
The wind power generation device includes: wind turbine, gearbox and generator. The wind power generation mainly comprises the steps that wind energy is absorbed, so that a wind turbine rotates, and the rotating speed is transmitted through a gear box to drive a generator to generate electricity; the wind energy utilization characteristics of a wind turbine are usually simulated by a cluster of wind energy utilization coefficient curves, the wind energy utilization coefficient is related to the blade tip speed ratio (the ratio of the blade tip speed to the wind speed) and the pitch angle, different performance curves of the wind energy utilization coefficient and the blade tip speed are obtained for given different pitch angles, each curve has a maximum value, and the curve shows the performance characteristics of the wind turbine.
When the wind turbine is in actual operation, and the wind speed is smaller than the cut-in wind speed, the active power of the wind turbine is zero; when the wind speed of the wind turbine is greater than the cut-in wind speed and less than the rated wind speed, the output active power is a section of characteristic curve; when the actual wind speed is larger than the rated wind speed and smaller than the cut-out wind speed, the output active power of the wind turbine is the rated power; and when the actual wind speed is greater than the cut-out wind speed, the active power output by the wind turbine is zero.
In the formula: pw-active power output by the wind turbine; pR-wind turbine rated power; v. ofin-wind turbine cut-in wind speed; v. ofrated-wind turbine rated wind speed; v. ofrated-wind turbine cut-out wind speed; k-wind speed index coefficient.
The photovoltaic power generation is based on a PN junction formed by two different semiconductor materials and drift current formed by unbalanced minority carriers in the PN junction. The solar energy is converted into direct current through the photovoltaic cell array, and the generated direct current needs to be subjected to voltage grade conversion through the DC/DC converter, so that the generated voltage is consistent with the voltage of the direct current bus, and the grid connection can be realized.
The energy storage device adopts a mixed energy storage mode of a sodium-sulfur storage battery and a fuel cell, and the sodium-sulfur storage battery has the advantages of long cycle life, high energy density, suitability for power type energy storage and energy type energy storage, high charging and discharging efficiency, benefit for power generation load adjustment and load translation of renewable energy sources and the like. When the voltage on the direct current bus is higher than the rated voltage, the sodium-sulfur storage battery firstly absorbs the redundant electric quantity and stores the electric energy; when the voltage on the direct current bus is lower than the rated voltage, the energy storage device releases electric energy, so that the voltage on the direct current bus is recovered to a steady-state value. The charging and discharging of the battery involve two important parameters, namely the state of charge soc (storage of discharge) and the depth of discharge dod (depth of discharge), which are expressed by the following formulas:
in the formula: ebat(t) -sodium-sulfur storage battery at time tThe remaining capacity of electricity; ebat,cap-represents the capacity of the accumulator. Therefore, SOC is between 0 and 1, and when SOC is 0, it indicates that the battery is completely empty, and SOC is 1, which indicates that the battery is in a full capacity state.
In the embodiment of the invention, the fuel cell adopts a proton exchange membrane fuel cell, and when the electric quantity on the direct current bus is excessive, hydrogen and oxygen are generated in a water electrolysis mode; when the direct current bus is short of power supply, hydrogen and oxygen enter the fuel cell and release electric energy under the action of the catalyst, so that the short of power supply on the direct current bus is made up.
The embodiment of the invention further preferably improves the discharging process of the sodium-sulfur storage battery, and adopts a step-by-step discharging mode for discharging the sodium-sulfur storage battery. Firstly, a vector group is established for the storage batteries before discharging, named as a vector group A, one storage battery is randomly selected from the vector group A, the storage battery is discharged to 60% of the state of charge, namely the SOC is 60%, and the storage battery which is completely discharged is marked in a vector group B. And judging whether the vector group A is an empty set or not, and when the vector group A is the empty set, indicating that all the storage batteries are discharged to 60%. The batteries in vector group B were further discharged, and the batteries in vector group B continued to be sequentially discharged to 30%, indicating that the sodium-sulfur battery was completely discharged when vector group B was empty. The battery that was originally discharged to 60% was further discharged until SOC became 30%. And starting the hydrogen energy storage system to continue discharging, starting the proton exchange membrane fuel cell, generating electric energy under the action of the catalyst by using the hydrogen fuel and the oxygen, supplying power for the direct current bus, and maintaining the stability of the power system.
The embodiment of the invention further preferably provides a sodium-sulfur storage battery constant-voltage and constant-current classified charging mode, and the constant-current charging mode is adopted in the initial charging stage. The constant-current and constant-voltage hybrid charging method has the advantages that a large gassing phenomenon cannot occur in the sodium-sulfur storage battery, and the service life of the storage battery is prolonged beneficially.
The embodiment of the invention further preferably provides an energy storage management control strategy of the wind-solar-energy-storage complementary distributed energy power generation system, fully utilizes the complementation of wind energy and light energy in time and space, effectively stabilizes the fluctuation of power output, and adds energy storage devices, namely a sodium-sulfur storage battery energy storage device and a fuel cell energy storage device, on the basis. When the voltage on the direct current bus is higher than the rated voltage, the sodium-sulfur storage battery firstly absorbs redundant electric quantity to store the electric energy, and when the charging capacity of the storage battery reaches the upper limit, the redundant electric energy is consumed in a water electrolysis mode to generate hydrogen and oxygen; when the voltage on the direct current bus is lower than the rated voltage, the sodium-sulfur storage battery performs secondary discharge to 60% and 30% one by one, and finally the proton exchange membrane fuel cell is discharged to maintain the stability of the voltage on the direct current bus.
In order to match the load and the demand of the power grid, an energy storage device is required to maintain the stability of the power, namely, when the generated energy is excessive, redundant electric energy is stored, and when the generated energy is insufficient, the energy storage device can provide the load demand in time. Compared with the traditional distributed energy power generation system, the technical scheme of the embodiment of the invention makes full use of the complementation of wind energy and light energy in time and space in form, adopts the hybrid energy storage device, aims to solve the randomness and the intermittence of the output power of the wind energy and the light energy, innovatively provides an energy management control strategy, realizes the graded utilization of storage battery energy storage and fuel cell energy storage, provides a constant-current-constant-voltage charging mode of the storage battery, and is beneficial to prolonging the service life of the storage battery.
After the sodium-sulfur storage battery is discharged, the sodium-sulfur storage battery is in a state of waiting for charging, in order to keep the voltage of the direct current bus stable, the proton exchange membrane fuel cell is started, hydrogen fuel and oxygen generated by electrolyzed water are utilized, hydrogen on the anode loses electrons under the action of a catalyst platinum, a reduction reaction occurs, oxygen on the cathode and hydrogen ions generate water, an oxidation reaction occurs, electric energy is generated under the action of a closed loop, the fuel cell can continuously supply power for the direct current bus under the condition of insufficient power supply, and the stability of a power system is maintained.
Referring to fig. 1, the figure is a block diagram of a wind-solar-energy-storage hybrid power generation system, which includes wind power generation, photovoltaic power generation, an energy storage device, a direct current bus, a direct current load, an alternating current load, a DC/DC converter, an AC/DC rectifier, a DC/AC inverter, and the like. The wind power generation comprises a wind turbine, a gear box and a generator, wherein the wind turbine mainly absorbs wind energy through a wind wheel to enable the wind turbine to rotate, and the gear box transmits the rotating speed to drive the generator to generate power; the photovoltaic power generation is that solar energy is converted into direct current through a photovoltaic cell array, and the generated direct current needs to be subjected to voltage grade conversion through a DC/DC converter, so that the generated voltage is consistent with the voltage of a direct current bus; the energy storage device adopts a mixed energy storage mode of a sodium-sulfur storage battery and a fuel cell, and the sodium-sulfur storage battery has the advantages of long cycle life, high energy density, suitability for power type energy storage and energy type energy storage, high charging and discharging efficiency, benefit for power generation load adjustment and load translation of renewable energy sources and the like. When the voltage on the direct current bus is higher than the rated voltage, the sodium-sulfur storage battery firstly absorbs redundant electric quantity to store the electric energy, and when the sodium-sulfur storage battery reaches the upper limit of the capacity, the redundant electric energy is used for electrolyzing water, and the redundant electric energy is consumed to generate hydrogen and oxygen. When the voltage on the direct current bus is lower than the rated voltage, the storage battery discharges, when the capacity lower limit is reached, the fuel cell is started, and the hydrogen and the oxygen generate electric energy under the action of the catalyst to make up for the insufficient power supply on the direct current power grid. The electric energy on the direct current bus is used for direct current load on one hand, and on the other hand, the direct current is converted into alternating current for alternating current load under the action of the inverter DC/AC.
Referring to fig. 2, a charging process of a sodium-sulfur storage battery is shown, in which a single sodium-sulfur storage battery is numbered from 1 to n, and the numbers of the storage batteries form a set of vectors, a battery being charged is recorded as Sta, the battery is short-charged, which will affect the service life of the battery, that is, the SOC is at a small value, when the energy of a power generation unit is excessively loaded, redundant energy Δ P is charged to other batteries, so that some batteries are fully charged (SOC equals to 100%), when the number k of charged storage batteries equals to n, it indicates that all storage batteries are fully charged, and then a hydrogen energy storage unit is started, that is, the redundant electric energy is used for electrolyzing water, so as to implement hydrogen production by electrolysis and consume the redundant electric energy.
Referring to fig. 3, which shows the discharge process of the sodium-sulfur storage battery, the use frequency and the discharge depth of each storage battery are not too large. When the battery pack starts to discharge, one battery is randomly selected from the battery vector group a, discharged to 60% of the state of charge, that is, SOC is 60%, and the battery that has completed discharging is marked in the vector group B. And judging whether the vector group A is an empty set or not, and when the vector group A is the empty set, indicating that all the storage batteries are discharged to 60%. The batteries in vector group B were further discharged, and the batteries in vector group B continued to be sequentially discharged to 30%, indicating that the sodium-sulfur battery was completely discharged when vector group B was empty. And starting the proton exchange membrane fuel cell, generating electric energy under the action of the catalyst by utilizing the hydrogen fuel and the oxygen, supplying power to the direct current bus, and maintaining the stability of the power system.
Referring to fig. 4, which shows the constant voltage-constant current charging characteristic of the sodium-sulfur storage battery, in order to improve the service life of the sodium-sulfur storage battery, the present invention considers that a novel charging mode, i.e., classified charging, is adopted. In the initial charging stage, a constant-current charging mode is adopted, and the method has the advantages that no large current exists in the initial charging stage, and when the battery is charged to a certain capacity, a constant-voltage mode is adopted, so that large voltage cannot appear in the later stage of the storage battery. The constant-current and constant-voltage hybrid charging method has the advantages that a large gassing phenomenon cannot occur in the sodium-sulfur storage battery, and the service life of the storage battery is prolonged beneficially.
In conclusion, the invention provides a wind-solar-energy-storage-complementary distributed energy power generation system and an energy storage management control strategy, which fully utilize the complementation of wind energy and light energy in time and space, effectively stabilize the fluctuation of power output, and add an energy storage device on the basis, wherein the energy storage device comprises a sodium-sulfur storage battery for storing energy and a fuel cell for storing energy. When the voltage on the direct current bus is higher than the rated voltage, the sodium-sulfur storage battery firstly absorbs redundant electric quantity to store the electric energy, and when the charging capacity of the storage battery reaches the upper limit, the redundant electric energy is consumed in a water electrolysis mode to generate hydrogen and oxygen; when the voltage on the direct current bus is lower than the rated voltage, the sodium-sulfur storage battery performs secondary discharge to 60% and 30% one by one, and finally the proton exchange membrane fuel cell is discharged to maintain the stability of the voltage on the direct current bus. Besides, the invention provides a classified charging mode of the storage battery, namely constant-current and constant-voltage charging, so that overlarge current and voltage cannot occur in the whole charging process. The wind-solar-energy-storage-complementary distributed energy power generation system and the energy storage management control strategy are adopted, so that the randomness and the intermittence of the output power of wind energy and light energy are effectively solved.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (10)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111223951.1A CN113937750A (en) | 2021-10-18 | 2021-10-18 | Wind-solar-storage complementary distributed energy power generation system and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111223951.1A CN113937750A (en) | 2021-10-18 | 2021-10-18 | Wind-solar-storage complementary distributed energy power generation system and control method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113937750A true CN113937750A (en) | 2022-01-14 |
Family
ID=79280864
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111223951.1A Pending CN113937750A (en) | 2021-10-18 | 2021-10-18 | Wind-solar-storage complementary distributed energy power generation system and control method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113937750A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114725963A (en) * | 2022-06-10 | 2022-07-08 | 沈阳微控新能源技术有限公司 | Independent energy storage power station system and control method thereof |
| CN116960920A (en) * | 2023-07-05 | 2023-10-27 | 吉林建筑大学 | Wind, light and fuel cell multifunctional complementary hybrid power generation system and method |
| CN117879117A (en) * | 2024-03-11 | 2024-04-12 | 南京欧陆电气股份有限公司 | Storage battery charging control system and control method thereof |
| CN118199183A (en) * | 2024-05-20 | 2024-06-14 | 北京圆声能源科技有限公司 | Virtual power plant operation control system |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140327407A1 (en) * | 2011-10-31 | 2014-11-06 | Renault S.A.S. | Method and system for managing the electric charges of battery cells |
| CN105896573A (en) * | 2016-06-03 | 2016-08-24 | 西南交通大学 | Power control method for composite energy storage system of energy internet |
| CN106170904A (en) * | 2014-03-03 | 2016-11-30 | 罗伯特·博世有限公司 | Mixing storage system |
| CN106787017A (en) * | 2017-03-09 | 2017-05-31 | 北京空间飞行器总体设计部 | A kind of Cross prevention of spacecraft lithium battery and the autonomous control method that restores electricity |
| CN106961150A (en) * | 2016-01-11 | 2017-07-18 | 上海电气集团股份有限公司 | The control method and system of composite energy storage battery |
| CN109144077A (en) * | 2018-11-12 | 2019-01-04 | 长沙源婕科技有限公司 | A kind of sweeping robot |
| CN112803573A (en) * | 2021-01-18 | 2021-05-14 | 天宏阳光新能源股份有限公司 | Wind-solar-hydrogen storage complementary uninterrupted power supply system |
-
2021
- 2021-10-18 CN CN202111223951.1A patent/CN113937750A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140327407A1 (en) * | 2011-10-31 | 2014-11-06 | Renault S.A.S. | Method and system for managing the electric charges of battery cells |
| CN106170904A (en) * | 2014-03-03 | 2016-11-30 | 罗伯特·博世有限公司 | Mixing storage system |
| CN106961150A (en) * | 2016-01-11 | 2017-07-18 | 上海电气集团股份有限公司 | The control method and system of composite energy storage battery |
| CN105896573A (en) * | 2016-06-03 | 2016-08-24 | 西南交通大学 | Power control method for composite energy storage system of energy internet |
| CN106787017A (en) * | 2017-03-09 | 2017-05-31 | 北京空间飞行器总体设计部 | A kind of Cross prevention of spacecraft lithium battery and the autonomous control method that restores electricity |
| CN109144077A (en) * | 2018-11-12 | 2019-01-04 | 长沙源婕科技有限公司 | A kind of sweeping robot |
| CN112803573A (en) * | 2021-01-18 | 2021-05-14 | 天宏阳光新能源股份有限公司 | Wind-solar-hydrogen storage complementary uninterrupted power supply system |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114725963A (en) * | 2022-06-10 | 2022-07-08 | 沈阳微控新能源技术有限公司 | Independent energy storage power station system and control method thereof |
| CN114725963B (en) * | 2022-06-10 | 2022-09-13 | 沈阳微控新能源技术有限公司 | Independent energy storage power station system and control method thereof |
| CN116960920A (en) * | 2023-07-05 | 2023-10-27 | 吉林建筑大学 | Wind, light and fuel cell multifunctional complementary hybrid power generation system and method |
| CN116960920B (en) * | 2023-07-05 | 2024-04-09 | 吉林建筑大学 | Wind, light and fuel cell multifunctional complementary hybrid power generation system and method |
| CN117879117A (en) * | 2024-03-11 | 2024-04-12 | 南京欧陆电气股份有限公司 | Storage battery charging control system and control method thereof |
| CN117879117B (en) * | 2024-03-11 | 2024-05-24 | 南京欧陆电气股份有限公司 | Storage battery charging control system and control method thereof |
| CN118199183A (en) * | 2024-05-20 | 2024-06-14 | 北京圆声能源科技有限公司 | Virtual power plant operation control system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113937750A (en) | Wind-solar-storage complementary distributed energy power generation system and control method thereof | |
| KR102306918B1 (en) | Renewable energy hybrid power generation system, and power generation method therefor | |
| CN107769236B (en) | Wind generating set energy storage and power generation system and energy scheduling method thereof | |
| CN105576803A (en) | Distributed new energy charging pile and hydrogen refueling station | |
| CN107425534A (en) | A kind of micro-capacitance sensor dispatching method based on optimization accumulator cell charging and discharging strategy | |
| CN104538983A (en) | System-control-requirement-oriented energy storage system optimum allocation method | |
| CN208386227U (en) | Wind-light storage is provided multiple forms of energy to complement each other system | |
| CN114024327A (en) | Renewable energy power generation based multi-energy complementation control system and method | |
| CN107508304A (en) | A kind of partition control method of battery energy storage system | |
| CN108629449A (en) | A kind of distribution robust formula Optimization Scheduling for alternating current-direct current mixing microgrid | |
| CN114049004B (en) | Method, system and device for randomly planning capacity of electric hydrogen energy station | |
| CN104242790A (en) | Wind-solar hybrid power generation system | |
| KR20190032999A (en) | Renewable energy hybrid power generation system, and power generation method therefor | |
| CN104167781A (en) | Wind-solar complementary power generation and energy storage control system | |
| CN114614499A (en) | An integrated power supply system for hydrogen production from renewable energy | |
| CN112531749B (en) | An off-grid wind-solar hydrogen thermal storage system and control method based on slow dynamic response | |
| Ali et al. | Energy management of a small-scale wind turbine system combined with battery storage system | |
| CN112003382B (en) | A system and method for producing hydrogen from wind power energy storage based on energy storage device | |
| Ali et al. | Intelligent hybrid energy system and grid integration using microcontrollers | |
| CN115411770B (en) | Energy management method of renewable energy system | |
| Xu et al. | Multi-objective optimization configuration of wind-solar coupling hydrogen production system | |
| CN112583036B (en) | Multi-energy ship distributed energy storage capacity configuration mode | |
| CN115276054A (en) | Coordination control method for gravity energy storage matrix system of new energy plant station | |
| CN203377633U (en) | Wind-solar complementation power generation system controller | |
| CN116960920B (en) | Wind, light and fuel cell multifunctional complementary hybrid power generation system and method |
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 |