CN114977193A - Modular optical storage integrated converter system topology structure and control strategy - Google Patents
Modular optical storage integrated converter system topology structure and control strategy Download PDFInfo
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- 238000011217 control strategy Methods 0.000 title claims abstract description 12
- 230000003287 optical effect Effects 0.000 title description 8
- 238000006243 chemical reaction Methods 0.000 claims abstract description 45
- 238000004146 energy storage Methods 0.000 claims abstract description 22
- 238000011084 recovery Methods 0.000 claims description 30
- 239000003990 capacitor Substances 0.000 claims description 24
- 230000001276 controlling effect Effects 0.000 claims description 18
- 230000001105 regulatory effect Effects 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 2
- 238000010248 power generation Methods 0.000 abstract description 12
- 238000004886 process control Methods 0.000 abstract description 7
- 230000004044 response Effects 0.000 abstract description 5
- 230000000087 stabilizing effect Effects 0.000 abstract description 3
- 238000005457 optimization Methods 0.000 description 4
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
-
- 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
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
- H02S40/30—Electrical components
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- 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
- H02J2300/26—The renewable source being solar energy of photovoltaic origin involving maximum power point tracking control for photovoltaic sources
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a modularized light-storage integrated converter system topological structure and a control strategy, and relates to the technical field of photovoltaic power generation. The photovoltaic energy storage process control system converts direct current at the front stage of the photovoltaic energy storage process control system into alternating current, the two stages of systems are connected together to form an integral system, the photovoltaic side boost converter can work in a maximum power tracking mode and a constant voltage mode, the grid side photovoltaic energy storage converter process control system can work in an off-grid mode and a grid-connected mode, the response speed of the system, the power controllability of grid-connected points and the integral conversion efficiency are improved on the premise of reducing cost, prolonging the service life of a battery system and stabilizing photovoltaic power generation fluctuation, and the comprehensive performance of the photovoltaic energy storage integral system is improved.
Description
Technical Field
The invention relates to the technical field of photovoltaic power generation, in particular to a topological structure and a control strategy of a modular light-storage integrated converter system.
Background
Photovoltaic power generation is favored by many countries and regions as a clean energy source, and the percentage of photovoltaic power generation is also rising year by year from the market point of view. For a photovoltaic power generation system, the output voltage of a photovoltaic module fluctuates in a certain range, and a boost converter is usually required to be added at the photovoltaic side to change the fluctuating voltage output by the photovoltaic module into a stable inverter input voltage, and meanwhile, the maximum power point tracking control of the photovoltaic is realized. From the photovoltaic volatility analysis, because the power generation system needs to provide stable and reliable electric energy for the load, a battery energy storage system and a photovoltaic module can be added to supply power for the load together.
The optical storage topologies adopted at present mainly comprise two topologies, one is shown in fig. 3, the system response is fast, the power controllability of a grid-connected point is high, the whole replacement efficiency is high, and the cost is low; however, the battery needs to frequently stabilize the photovoltaic power generation fluctuation, and has certain influence on the service life of the battery system pair. As shown in fig. 4, the battery system can both stabilize photovoltaic power generation fluctuation and optimize the service life of the battery system, and the comprehensive performance of the light storage integrated system is improved; however, the battery system is a two-stage topology, the response is slow, the overall conversion efficiency of the system is low, and the power controllability fluctuation of a grid-connected point is large. The two optical storage topologies have advantages and disadvantages respectively, and the disadvantages directly influence the optical storage system to exert the optimal performance.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a topological structure and a control strategy of a modularized light-storage integrated converter system, which are used for achieving the purposes of improving the response speed of the system, the power controllability of a grid-connected point and the overall conversion efficiency on the premise of reducing the cost, prolonging the service life of a battery system and stabilizing the fluctuation of photovoltaic power generation, and improving the comprehensive performance of the light-storage integrated system.
In order to solve the technical problems, the invention provides the following technical scheme:
a modularized light-storage integrated converter system topological structure comprises a photovoltaic or energy storage unit, a direct current conversion side and an alternating current conversion side, wherein the photovoltaic or energy storage unit is connected with the direct current conversion side, the direct current conversion side is connected with the alternating current conversion side through a direct current bus, and a capacitor is arranged on the direct current bus.
The direct current conversion side comprises a capacitor, an inductor and two groups of IGBT tubes; the capacitor on the direct current conversion side is connected in series with two ends of the photovoltaic or energy storage unit, the inductor and one group of IGBT tubes are connected in series and then connected in parallel with two ends of the capacitor on the direct current conversion side, and the other group of IGBT tubes on the direct current conversion side is connected in series with the capacitor on the direct current bus.
The alternating current conversion side comprises an inductor, a capacitor, a voltage transformer and two groups of IGBT tubes; the two groups of IGBT tubes are simultaneously connected in series at two ends of a capacitor of the direct current bus, one end of an alternating current conversion side inductor is connected between the two groups of IGBT tubes at the alternating current conversion side, the other end of the alternating current conversion side inductor is connected with a voltage transformer, and the capacitor is connected in series between the inductors at two adjacent groups of alternating current conversion sides.
A control strategy of a modular light-storage integrated converter system comprises the following steps:
s1, judging whether the current system is in a constant power discharge state, if so, entering discharge control judgment, and if not, entering charge state judgment;
s2, judging whether the initial control is constant power discharge control, if so, comparing the discharge power correction value, otherwise, entering charge control judgment;
s3, comparing whether the deviation between the discharge power correction value and the discharge power initial given value reaches a preset deviation, if so, judging the size of the discharge power correction value and the discharge power initial given value, otherwise, entering a charging state judgment;
s4, when the discharge power correction value is larger than the initial given value, regulating and controlling the discharge power correction value to make the discharge power correction value = the discharge power correction value-the active recovery step length meet, and then judging the charging state, otherwise, regulating and controlling the discharge power correction value to make the discharge power correction value = the discharge power correction value + the active recovery step length meet, and then judging the charging state;
s5, judging whether the initial control is constant power charging control, if so, judging the size of a discharge power correction value and an active power recovery step length, and if not, entering a charging state for judgment;
s6, when the discharge power correction value is larger than the active recovery step length, regulating and controlling the discharge power correction value to enable the discharge power correction value to meet the discharge power correction value-active recovery step length and then entering the charging state judgment, otherwise, enabling the constant power charging control and then entering the charging state judgment;
s7, judging whether the current system is in a constant power charging state, if so, entering charging control judgment, and if not, ending the control step;
s8, judging whether the initial control is constant power charging control, if so, comparing the charging power correction value, otherwise, entering discharging control judgment;
s9, comparing whether the deviation between the charging power correction value and the initial set value of the charging power reaches a preset deviation, if so, judging the magnitude of the charging power correction value and the initial set value of the charging power, otherwise, ending the control step;
s10, when the charging power correction value is larger than the initial given value, regulating and controlling the charging power correction value to meet the requirements of charging power correction value = charging power correction value-active recovery step length and then ending the control step, otherwise, regulating and controlling the charging power correction value to meet the requirements of charging power correction value = charging power correction value + active recovery step length and ending the control step;
s11, judging whether the initial control is constant power discharge control, if so, judging the size of a charging power correction value and an active power recovery step length, and if not, ending the control step;
and S12, when the charging power correction value is larger than the active recovery step length, regulating and controlling the charging power correction value to enable the charging power correction value to meet the requirement of charging power correction value-active recovery step length, and ending the control step, otherwise, ending the control step after constant power discharge control is issued.
Preferably, in step S3, the preset deviation of the discharge power correction value compared with the discharge power initial set value is 2 kW.
Preferably, in step S6, the constant power charging control is performed at 3 kW.
Preferably, in step S9, the preset deviation of the charging power correction value compared with the initial set value of the charging power is 2 kW.
Preferably, in step S12, the constant power discharge applied is controlled to be 3 kW.
Compared with the prior art, the invention has the following beneficial effects:
the photovoltaic energy storage converter process control system comprises a photovoltaic energy storage process control system, a photovoltaic side boost converter, a grid side photovoltaic energy storage converter and a grid side photovoltaic energy storage converter, wherein the photovoltaic energy storage process control system comprises a photovoltaic energy storage process control system and a grid side photovoltaic energy storage converter. When the photovoltaic module works in a maximum power tracking mode, the photovoltaic module captures solar energy to the maximum extent, and when the photovoltaic module works in a constant voltage mode, the aim is to maintain the voltage stability of a direct current bus; when the integrated optical storage system works in an off-grid mode, the integrated optical storage system independently supplies power to important loads; when the photovoltaic grid-connected power supply system works in a grid-connected mode, the photovoltaic system feeds energy to a power grid, and the problem that the power supply capacity of a main grid is insufficient is solved. The whole system integrates multiple functions of photovoltaic power generation, energy storage, grid connection and the like, can realize the access of multiple paths of multi-type photovoltaic equipment, improves the response speed of the system, the power controllability of grid connection points and the overall replacement efficiency on the premise of reducing the cost, prolonging the service life of a battery system and stabilizing the fluctuation of the photovoltaic power generation, and improves the comprehensive performance of the light storage integrated system.
Drawings
FIG. 1 is a diagram of the topology of the system of the present invention;
FIG. 2 is a flow chart of the system control of the present invention;
FIG. 3 is a diagram of a current optical storage topology;
fig. 4 is a diagram of a light storage topology structure in which a battery system is a dual-stage topology currently used.
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 obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
As shown in fig. 1-2, the present invention provides a technical solution: a modularized light-storage integrated converter system topological structure comprises a photovoltaic or energy storage unit, a direct current conversion side and an alternating current conversion side, wherein the photovoltaic or energy storage unit is connected with the direct current conversion side, the direct current conversion side is connected with the alternating current conversion side through a direct current bus, and a capacitor is arranged on the direct current bus.
The direct current conversion side comprises a capacitor, an inductor and two groups of IGBT tubes; the capacitor on the direct current conversion side is connected in series with two ends of the photovoltaic or energy storage unit, the inductor and one group of IGBT tubes are connected in series and then connected in parallel with two ends of the capacitor on the direct current conversion side, and the other group of IGBT tubes on the direct current conversion side is connected in series with the capacitor on the direct current bus.
The alternating current conversion side comprises an inductor, a capacitor, a voltage transformer and two groups of IGBT tubes; the two groups of IGBT tubes are simultaneously connected in series at two ends of a capacitor of the direct current bus, one end of an alternating current conversion side inductor is connected between the two groups of IGBT tubes at the alternating current conversion side, the other end of the alternating current conversion side inductor is connected with a voltage transformer, and the capacitor is connected in series between the inductors at two adjacent groups of alternating current conversion sides.
A control strategy of a modular light-storage integrated converter system comprises the following steps:
s1, judging whether the current system is in a constant power discharge state, if so, entering discharge control judgment, and if not, entering charge state judgment;
s2, judging whether the initial control is constant power discharge control, if so, comparing the discharge power correction value, otherwise, entering charge control judgment;
s3, comparing whether the deviation between the discharge power correction value and the discharge power initial given value reaches a preset deviation, if so, judging the size of the discharge power correction value and the discharge power initial given value, otherwise, entering a charging state judgment;
s4, when the discharge power correction value is larger than the initial given value, regulating and controlling the discharge power correction value to make the discharge power correction value = the discharge power correction value-the active recovery step length meet, and then judging the charging state, otherwise, regulating and controlling the discharge power correction value to make the discharge power correction value = the discharge power correction value + the active recovery step length meet, and then judging the charging state;
s5, judging whether the initial control is constant power charging control, if so, judging the size of a discharge power correction value and an active power recovery step length, and if not, entering a charging state for judgment;
s6, when the discharge power correction value is larger than the active recovery step length, regulating and controlling the discharge power correction value to enable the discharge power correction value to meet the discharge power correction value-active recovery step length and then entering the charging state judgment, otherwise, enabling the constant power charging control and then entering the charging state judgment;
s7, judging whether the current system is in a constant power charging state, if so, entering charging control judgment, and if not, ending the control step;
s8, judging whether the initial control is constant power charging control, if so, comparing the charging power correction value, otherwise, entering discharging control judgment;
s9, comparing whether the deviation between the charging power correction value and the initial set value of the charging power reaches a preset deviation, if so, judging the magnitude of the charging power correction value and the initial set value of the charging power, otherwise, ending the control step;
s10, when the charging power correction value is larger than the initial given value, regulating and controlling the charging power correction value to meet the requirements of charging power correction value = charging power correction value-active recovery step length and then ending the control step, otherwise, regulating and controlling the charging power correction value to meet the requirements of charging power correction value = charging power correction value + active recovery step length and ending the control step;
s11, judging whether the initial control is constant power discharge control, if so, judging the size of a charging power correction value and an active power recovery step length, and if not, ending the control step;
and S12, when the charging power correction value is larger than the active recovery step length, regulating and controlling the charging power correction value to enable the charging power correction value to meet the requirement of charging power correction value-active recovery step length, and ending the control step, otherwise, ending the control step after constant power discharge control is issued.
As a technical optimization of the present invention, in step S3, the preset deviation of the discharge power correction value compared with the initial set value of discharge power is 2 kW.
As a technical optimization scheme of the present invention, in step S6, the issued constant power charging control is 3 kW.
As a technical optimization of the present invention, in step S9, the preset deviation of the charging power correction value compared with the initial set value of the charging power is 2 kW.
As a technical optimization scheme of the present invention, in step S12, the constant power discharge delivered is controlled to be 3 kW.
It should be noted that, in this document, terms such as "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.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. The utility model provides a modularization light stores up integrative conversion system topological structure, includes photovoltaic or energy storage unit, direct current conversion side and exchange and change the side, its characterized in that: the photovoltaic or energy storage unit is connected with a direct current conversion side, the direct current conversion side is connected with an alternating current conversion side through a direct current bus, and a capacitor is arranged on the direct current bus;
the direct current conversion side comprises a capacitor, an inductor and two groups of IGBT tubes; the capacitor on the direct current conversion side is connected in series with two ends of the photovoltaic or energy storage unit, the inductor and one group of IGBT tubes are connected in series and then connected in parallel with two ends of the capacitor on the direct current conversion side, and the other group of IGBT tubes on the direct current conversion side is connected in series with the capacitor on the direct current bus;
the alternating current conversion side comprises an inductor, a capacitor, a voltage transformer and two groups of IGBT tubes; the two groups of IGBT tubes are simultaneously connected in series at two ends of a capacitor of a direct current bus, one end of the alternating current conversion side inductor is connected between the two groups of IGBT tubes at the alternating current conversion side, the other end of the alternating current conversion side inductor is connected with a voltage transformer, and the capacitor is connected in series between the inductors at two adjacent groups of alternating current conversion sides;
a control strategy of a modularized light-storage integrated converter system is characterized in that: the method comprises the following steps:
s1, judging whether the current system is in a constant power discharge state, if so, entering discharge control judgment, and if not, entering charge state judgment;
s2, judging whether the initial control is constant power discharge control, if so, comparing the discharge power correction value, otherwise, entering charge control judgment;
s3, comparing whether the deviation between the discharge power correction value and the discharge power initial given value reaches a preset deviation, if so, judging the size of the discharge power correction value and the discharge power initial given value, otherwise, entering a charging state judgment;
s4, when the discharge power correction value is larger than the initial given value, regulating and controlling the discharge power correction value to make the discharge power correction value = the discharge power correction value-the active recovery step length meet, and then judging the charging state, otherwise, regulating and controlling the discharge power correction value to make the discharge power correction value = the discharge power correction value + the active recovery step length meet, and then judging the charging state;
s5, judging whether the initial control is constant power charging control, if so, judging the size of a discharge power correction value and an active power recovery step length, and if not, entering a charging state for judgment;
s6, when the discharge power correction value is larger than the active recovery step length, regulating and controlling the discharge power correction value to enable the discharge power correction value to meet the discharge power correction value-active recovery step length and then entering the charging state judgment, otherwise, enabling the constant power charging control and then entering the charging state judgment;
s7, judging whether the current system is in a constant power charging state, if so, entering charging control judgment, and if not, ending the control step;
s8, judging whether the initial control is constant power charging control, if so, comparing the charging power correction value, otherwise, entering discharging control judgment;
s9, comparing whether the deviation between the charging power correction value and the initial set value of the charging power reaches a preset deviation, if so, judging the magnitude of the charging power correction value and the initial set value of the charging power, otherwise, ending the control step;
s10, when the charging power correction value is larger than the initial given value, regulating and controlling the charging power correction value to meet the requirements of charging power correction value = charging power correction value-active recovery step length and then ending the control step, otherwise, regulating and controlling the charging power correction value to meet the requirements of charging power correction value = charging power correction value + active recovery step length and ending the control step;
s11, judging whether the initial control is constant power discharge control, if so, judging the size of a charging power correction value and an active power recovery step length, and if not, ending the control step;
and S12, when the charging power correction value is larger than the active recovery step length, regulating and controlling the charging power correction value to enable the charging power correction value to meet the requirement of charging power correction value-active recovery step length, and ending the control step, otherwise, ending the control step after constant power discharge control is issued.
2. The topology and control strategy of a modular light-storage integrated converter system according to claim 1, wherein: in step S3, the preset deviation of the discharge power correction value compared with the initial set value of discharge power is 2 kW.
3. The topology and control strategy of a modular light-storage integrated converter system according to claim 1, wherein: in step S6, the constant power charge control issued is 3 kW.
4. The topology and control strategy of a modular light-storage integrated converter system according to claim 1, wherein: in step S9, the preset deviation of the charging power correction value compared with the initial set value of the charging power is 2 kW.
5. The topology and control strategy of a modular light-storage integrated converter system according to claim 1, wherein: in step S12, the constant power discharge control issued is 3 kW.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116581812A (en) * | 2023-04-12 | 2023-08-11 | 长园深瑞能源技术有限公司 | Hybrid light storage inverter, control method and photovoltaic energy storage system |
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| CN116581812A (en) * | 2023-04-12 | 2023-08-11 | 长园深瑞能源技术有限公司 | Hybrid light storage inverter, control method and photovoltaic energy storage system |
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