CN113824148A - Power generation system and control method thereof - Google Patents
Power generation system and control method thereof Download PDFInfo
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- CN113824148A CN113824148A CN202111215488.6A CN202111215488A CN113824148A CN 113824148 A CN113824148 A CN 113824148A CN 202111215488 A CN202111215488 A CN 202111215488A CN 113824148 A CN113824148 A CN 113824148A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B13/00—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates
- F03B13/06—Stations or aggregates of water-storage type, e.g. comprising a turbine and a pump
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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
- H02J15/00—Systems for storing electric energy
- H02J15/003—Systems for storing electric energy in the form of hydraulic energy
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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
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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
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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
- H02J2300/28—The renewable source being wind energy
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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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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- 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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/16—Mechanical energy storage, e.g. flywheels or pressurised fluids
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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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Abstract
The invention provides a power generation system and a control method thereof, which are applied to the technical field of power generation, and the system comprises a new energy power generation system, a pumped-storage system and a bidirectional electric energy conversion system, wherein the new energy power generation system is connected with the pumped-storage system, the pumped-storage system is connected with an alternating current power grid through the bidirectional electric energy conversion system, the pumped-storage system stores electric energy output by the new energy power generation system into water potential energy and converts the water potential energy into electric energy, the bidirectional electric energy conversion system further converts the electric energy output by the pumped-storage system into electric energy meeting grid-connection requirements, and finally, the new energy power generation system outputs the electric energy to be connected into a grid. The new energy power generation system is connected with the pumped storage system, the electric energy of the new energy power generation system is gathered by the pumped storage system, and the concentrated output of the electric energy is realized, so that the consumption level of the new energy power generation system is improved, the influence of the fluctuation and the intermittence of the new energy power generation system on an alternating current power grid is counteracted, and the operation stability of the alternating current power grid is further improved.
Description
Technical Field
The invention relates to the technical field of power generation, in particular to a power generation system and a control method thereof.
Background
In recent years, with the development of photovoltaic power generation and wind power generation technologies, new energy power generation systems represented by photovoltaic power stations and wind power stations play an increasingly important role in industrial production and daily life, and become an indispensable component for realizing clean energy.
However, limited by the power generation principles of photovoltaic power generation and wind power generation, new energy power generation systems such as photovoltaic power stations and wind power stations have unstable power output, and as the proportion of the new energy power generation amount in the whole power supply of the power grid is higher and higher, the influence of the volatility and intermittence of the new energy power generation system on the whole scheduling and safe operation of the power grid is continuously increased.
Therefore, how to reduce the influence of the volatility and the intermittency of the new energy power generation system on the alternating current power grid and improve the operation stability of the alternating current power grid becomes one of the technical problems to be solved urgently by the person in the field.
Disclosure of Invention
The invention provides a power generation system and a control method thereof, wherein a new energy power generation system is connected with a pumped storage system, and the electric energy of the new energy power generation system is gathered by using the pumped storage system to realize the concentrated output of the electric energy, so that the consumption level of the new energy power generation system is improved, the influence of the fluctuation and the intermittence of the new energy power generation system on an alternating current power grid is counteracted, and the operation stability of the alternating current power grid is further improved.
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
in a first aspect, the present invention provides a power generation system comprising: a new energy power generation system, a pumped storage system and a bidirectional electric energy conversion system, wherein,
the new energy power generation system comprises a plurality of new energy power stations which are dispersedly arranged;
each new energy power station is respectively connected with the pumped storage system;
the pumped storage system stores the total electric energy output by the new energy power generation system into water potential energy and converts the water potential energy into electric energy;
the bidirectional electric energy conversion system is connected between the pumped storage system and an alternating current power grid;
the bidirectional electric energy conversion system converts the electric energy output by the pumped storage system into electric energy meeting grid-connected requirements.
Optionally, the type of the new energy power station includes at least one of a photovoltaic power generation type and a wind power generation type.
Optionally, the pumped-hydro energy storage system includes: an energy storage and power generation system and at least one motor drive system, wherein,
the input end of the motor driving system is connected with at least one new energy power station;
the output end of the motor driving system is connected with the energy storage power generation system;
and the motor driving system is used for converting the electric energy output by the new energy power station into the electric energy meeting the operation requirement of the energy storage power generation system.
Optionally, the motor driving system includes at least one type, and the motor driving system of any type is adapted to the electric energy output by the new energy power station connected to the motor driving system.
Optionally, the type of the motor drive system is at least one of an ac-dc-ac type drive system and a dc-ac type drive system.
Optionally, in the case that the pumped-storage system outputs ac power, the bidirectional electric energy conversion system includes at least one ac-dc conversion system and at least one dc-ac conversion system, wherein,
the alternating current end of the alternating current-direct current conversion system is connected with the pumped storage system, and the alternating current electric energy output by the pumped storage system is converted into direct current electric energy meeting preset conditions;
the direct current end of the direct current-alternating current conversion system is connected with the direct current end of the alternating current-direct current conversion system, and the alternating current end of the direct current-alternating current conversion system is connected with an alternating current power grid;
the direct current-alternating current conversion system converts the direct current electric energy meeting the preset conditions into alternating current electric energy meeting grid connection requirements;
in the case that the pumped-hydro energy storage system outputs direct current, the bidirectional electrical energy conversion system comprises at least one direct current-to-alternating current conversion system, wherein,
the direct current end of the direct current-alternating current conversion system is connected with the pumped storage system, and the alternating current end of the direct current-alternating current conversion system is connected with an alternating current power grid;
and the direct current-alternating current conversion system converts the direct current electric energy output by the pumped storage system into alternating current electric energy meeting grid connection requirements.
Optionally, in a case where the bidirectional electric energy conversion system includes a plurality of dc-ac conversion systems, the plurality of dc-ac conversion systems corresponds to at least one voltage class.
Optionally, the dc-ac conversion system includes: a DC/AC module and a grid-tie transformer, wherein,
the direct current end of the DC/AC module is used as the direct current end of the direct current-alternating current conversion system;
the alternating current end of the DC/AC module is connected with the primary side connecting end of the grid-connected transformer;
and the secondary side connecting end of the grid-connected transformer is used as an alternating current end of the direct current-alternating current conversion system.
Optionally, the AC-DC conversion system includes an AC/DC module;
in the case where the bidirectional electric energy conversion system includes a plurality of the ac-dc conversion systems, the ac connection terminals of the respective ac-dc conversion systems are connected in parallel.
Optionally, the ac terminals of the dc-ac conversion systems corresponding to the same voltage class are connected in parallel.
Optionally, the energy storage and power generation system comprises an energy storage system and a potential energy power generation system, wherein,
the energy storage system stores the electric energy output by the new energy power generation system into water potential energy;
the potential energy power generation system converts water potential energy into electric energy.
Optionally, the energy storage system comprises a water inlet pump and a multi-stage buffer pool, wherein,
the driving end of the water inlet pump is connected with the motor driving system;
the water inlet pump stores the water with low potential energy in the multistage buffer pool as the water with high potential energy by utilizing the electric energy output by the new energy power generation system;
the potential energy power generation system comprises a power generation device, wherein,
the power generation device converts water potential energy into electric energy in the process of releasing water in the multi-stage buffer pool.
Optionally, the multistage buffer pool includes a plurality of water storage pools, and potential energy corresponding to each of the water storage pools is different.
In a second aspect, the present invention provides a control method for a power generation system, which is applied to the power generation system according to any one of the first aspect of the present invention, the method including:
acquiring an electric energy scheduling instruction;
responding to the electric energy scheduling instruction, and acquiring electric quantity parameters of a new energy power generation system and a pumped storage system in the power generation system;
and controlling the electric energy interaction of the new energy power generation system and an alternating current power grid according to the electric quantity parameter of the new energy power generation system and the electric quantity parameter of the pumped storage system.
Optionally, the electric quantity parameter of the new energy power generation system includes predicted electric energy generation;
the process of obtaining the electric quantity parameter of the new energy power generation system comprises the following steps:
acquiring an electric quantity deviation adjustment coefficient, and a predicted generated energy and an electric quantity correction coefficient of each new energy power station in the new energy power generation system;
calculating the predicted power generation amount of the new energy power generation system according to the following formula:
wherein, WyRepresenting a predicted power generation amount of the new energy power generation system;
Airepresenting the electric quantity correction coefficient of the ith new energy power station, wherein i belongs to [1, N ∈ [ ]]N is the total number of the new energy power station;
Wirepresenting the predicted power generation amount of the ith new energy power station;
k represents the electric quantity deviation adjustment coefficient.
Optionally, the electric quantity parameter of the new energy power generation system includes predicted electric energy generation;
the electric quantity parameters of the pumped storage system comprise rated storage electric quantity and stored electric quantity;
according to the electric quantity parameter of the new energy power generation system and the electric quantity parameter of the pumped storage system, controlling the electric energy interaction of the new energy power generation system and an alternating current power grid, and the method comprises the following steps:
calculating the difference value between the rated energy storage electric quantity and the predicted power generation amount and the stored electric quantity to obtain peak shaving electric quantity;
and controlling the new energy power generation system and the alternating current power grid to carry out bidirectional peak shaving according to the peak shaving electric quantity.
Optionally, the controlling the electric energy interaction between the new energy power generation system and the ac power grid according to the electric quantity parameter of the new energy power generation system and the electric quantity parameter of the pumped storage system further includes:
calculating the sum of the predicted generated energy and the stored electric energy to obtain the electric energy which can be output;
and controlling the new energy power generation system to perform electric energy interaction with an alternating current power grid according to the output electric quantity.
Optionally, the obtaining of the electric energy scheduling instruction includes:
and acquiring an electric energy scheduling instruction of at least one of the power grid scheduling energy controller, the automatic generation control system AGC and the automatic voltage control system AVC.
The power generation system provided by the invention comprises a new energy power generation system, a pumped storage system and a bidirectional electric energy conversion system, wherein the new energy power generation system is connected with the pumped storage system, the pumped storage system is connected with an alternating current power grid through the bidirectional electric energy conversion system, the pumped storage system stores electric energy output by the new energy power generation system into water potential energy and converts the water potential energy into electric energy, the bidirectional electric energy conversion system further converts the electric energy output by the pumped storage system into electric energy meeting grid-connected requirements, and finally, the electric energy output by the new energy power generation system is connected into a grid. According to the power generation system provided by the invention, the new energy power generation system is connected with the pumped storage system, and the electric energy of the new energy power generation system is converged by using the pumped storage system to realize the concentrated output of the electric energy, so that the consumption level of the new energy power generation system is improved, the influence of the fluctuation and the intermittence of the new energy power generation system on an alternating current power grid is counteracted, and the operation stability of the alternating current power grid is further improved.
Furthermore, because the capacity of the pumped storage system is often far greater than the electric quantity that can be supplied by the new energy system, the fluctuation of the output electric energy of the new energy system can not influence the pumped storage system, therefore, the networking requirement of the new energy power generation system can be reduced, and the comprehensive utilization rate of the new energy power generation system can be further improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a block diagram of a power generation system according to an embodiment of the present invention;
FIG. 2 is a block diagram of another power generation system provided by an embodiment of the present invention;
FIG. 3 is a block diagram of a power generation system according to another embodiment of the present invention;
fig. 4-7 are block diagrams of structures of a bidirectional power conversion system provided by an embodiment of the invention;
fig. 8 is a flowchart of a control method of a power generation system according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, 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 application.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a power generation system according to an embodiment of the present invention, where the power generation system according to the embodiment of the present invention includes: a new energy power generation system, a pumped storage system and a bidirectional electric energy conversion system, wherein,
as shown in fig. 1, the new energy power generation system provided by the embodiment of the present invention includes a plurality of new energy power stations (n is shown in the figure, and n is greater than or equal to 2) which are dispersedly disposed, and each new energy power station is respectively connected to a pumped storage system. Optionally, the type of the new energy power station may be at least one of a photovoltaic power generation type and a wind power generation type, that is, the new energy power generation system may only include a photovoltaic power station, may also only include a wind power station, and may also include both a photovoltaic power station and a wind power station. Of course, the new energy power generation system may also include other types of new energy power stations, which are not listed here, and also fall within the protection scope of the present invention without departing from the scope of the core idea of the present invention.
Based on the actual construction conditions of the photovoltaic power station and the wind power station, the two types of new energy power stations need to fully utilize natural conditions to output electric energy, which inevitably causes that the power generation capacity and the construction position of the photovoltaic power station and the wind power station are greatly restricted by the natural conditions, not only is the output electric energy capacity of a single power station limited, but also the new energy power stations are far away from each other in geographical positions, so that large-scale comprehensive application is difficult to realize.
Based on the above, in practical application, the new energy power generation system outputs electric energy to the pumped storage system, the pumped storage system uses the total electric energy (i.e. the sum of the electric energy output by each new energy power station) output by the new energy power generation system to do work, and stores water at a low water level to a high water level, so that the electric energy is converted into water potential energy, the small-capacity electric energy output by each dispersed new energy power station in the new energy power generation system is gathered and stored, and further, when power generation is needed, the pumped storage system uses the potential energy of the water to generate power, and converts the water potential energy into electric energy to be output.
Optionally, the pumped-storage energy storage system includes an energy storage power generation system and at least one motor drive system, an input end of any one of the motor drive systems is connected to at least one new energy power station, and an output end of each motor drive system is connected to the energy storage power generation system. In practical application, the motor driving system comprises at least one type, and the motor driving system of any type is adaptive to the electric energy output by the new energy power station connected with the motor driving system, so that the electric energy output by the new energy power station connected with the motor driving system is converted into the electric energy meeting the operation requirement of the energy storage power generation system. The specific structure of the motor driving system and the connection relationship between the motor driving system and the new energy power station will be developed in the following, and will not be detailed here.
The energy storage power generation system specifically comprises an energy storage system and a potential energy power generation system, wherein the energy storage system comprises a water inlet pump and a multi-stage buffer pool, a driving end of the water inlet pump is connected with a motor driving system and can run under the driving of the motor driving system, and water with low potential energy in the multi-stage buffer pool is stored into water with high potential energy by utilizing electric energy output by the new energy power generation system, so that the electric energy output by the new energy power generation system is stored into water potential energy. Optionally, the multi-stage buffer pool includes a plurality of water storage pools, and potential energy corresponding to each water storage pool is different. It can be understood that, in practical applications, the building heights of the water storage tanks are different, and when water is stored in the corresponding water storage tanks, the corresponding potential energy is stored, so that the potential energy corresponding to the water storage tanks mentioned in this embodiment actually refers to the potential energy of the water stored in the water storage tanks. The potential energy power generation system mainly comprises a power generation device, and specifically, the power generation device generates power by utilizing the potential energy of water in the process of releasing water in the multistage buffer pool, so that the potential energy of the water is converted into electric energy.
Furthermore, one end of the bidirectional electric energy conversion system is connected with the potential energy power generation system of the pumped storage system, and the other end of the bidirectional electric energy conversion system is connected with the alternating current power grid, namely the bidirectional electric energy conversion system is connected between the pumped storage system and the alternating current power grid, and the electric energy output by the pumped storage system is converted into the electric energy meeting grid-connection requirements through the bidirectional electric energy conversion system, so that the electric energy is output to the alternating current power grid.
It can be thought that, combining the new energy power generation technology and the pumped storage technology in the prior art, the installed capacity of the pumped storage system is far larger than that of the new energy power generation system, and the requirement of the pumped storage process on the output electric energy of the new energy power generation system is very low, so long as the water pump can be driven to convey the water with low water level to high water level, the conversion of the electric energy to the water potential energy can be realized, and the gradual convergence of the small-capacity electric energy of the new energy power generation system can be realized, therefore, through the power generation system provided by the invention, the new energy power generation system is connected with the pumped storage system, the pumped storage system is utilized to converge the small-capacity electric energy of each new energy power station dispersedly arranged in the new energy power generation system, the centralized output of the electric energy is realized, thereby the consumption level of the new energy power generation system is improved, and the influence of the volatility and the intermittence of the new energy power generation system on the alternating current power grid is counteracted, and further improve the operation stability of the alternating current power grid.
Furthermore, because the capacity of the pumped storage system is often far greater than the electric quantity that can be supplied by the new energy system, the fluctuation of the output electric energy of the new energy system can not influence the pumped storage system, therefore, the networking requirement of the new energy power generation system can be reduced, and the comprehensive utilization rate of the new energy power generation system can be further improved.
Furthermore, compared with an electric energy storage mode realized by using an energy storage battery in the prior art, the pumped storage system is used for storing electric energy, the system has lower cost and higher safety under the same capacity scale, and the scheduling process of the whole power supply network can be simplified.
As mentioned above, the pumped-storage system includes at least one motor-driven system, and for any motor-driven system, its input end is connected to at least one new energy power station, and its output end is connected to a water-intake pump in the pumped-storage system. The electric energy output by the new energy power station can be converted into the electric energy meeting the working requirement of the water inlet pump through the motor driving system, and then the water inlet pump is driven to work.
Referring to fig. 2 and 3, on the basis of the embodiment shown in fig. 1, the embodiment shown in fig. 2 and 3 further provides an alternative connection mode between the motor drive system and the new energy power generation system in the case that the pumped-storage system is provided with different numbers of motor drive systems.
In the embodiment shown in fig. 2, a motor driving system is arranged in the pumped storage system, the output end of each new energy power station is connected with the input end of the motor driving system, and the output end of the motor driving system is connected with the energy storage power generation system.
In the embodiment shown in fig. 3, two motor drive systems are included, namely motor drive system 1 and motor drive system 2. As an optional connection mode, the output end of each photovoltaic power station is connected with the input end of the motor driving system 1, the output end of each wind power station is connected with the input end of the motor driving system 2, and the output ends of the motor driving system 1 and the motor driving system 2 are connected with the energy storage and power generation system respectively.
Alternatively, for any of the above embodiments, the actual type of motor drive system may be selected from at least one of an ac-dc-ac type drive system and a dc-ac type drive system. As for the specific selection of which type of driving system, the specific setting of the new energy power station and the pumped storage system is mainly determined, the input end of the motor driving system needs to adopt a corresponding alternating current or direct current input circuit along with the output of the new energy power station, and the output end of the motor driving system needs to be selected according to the type of a water inlet pump in the pumped storage system and needs to be matched with the power utilization type of the water inlet pump.
The following describes specific optional implementations of the bidirectional power conversion system provided by the present invention:
in the bidirectional electric energy conversion system provided by the embodiment of the invention, under the condition that the pumped storage system outputs alternating current, the bidirectional electric energy conversion system comprises at least one alternating current-direct current conversion system and at least one direct current-alternating current conversion system, wherein,
the alternating current end of the alternating current-direct current conversion system is connected with the pumped storage system, and converts the alternating current electric energy output by the pumped storage system into direct current electric energy meeting preset conditions.
The direct current end of the direct current-alternating current conversion system is connected with the direct current end of the alternating current-direct current conversion system, the alternating current end of the direct current-alternating current conversion system is connected with an alternating current power grid, namely the direct current-alternating current conversion system is connected between the alternating current power grid and the alternating current power grid, the direct current-alternating current conversion system converts direct current electric energy meeting preset conditions into alternating current electric energy meeting grid-connection requirements, and finally grid-connection operation of the power generation system provided by the embodiment of the invention is achieved.
Further, in the case that the pumped-storage system outputs dc power, the bidirectional power conversion system comprises at least one dc-ac conversion system, wherein,
the direct current end of the direct current-alternating current conversion system is connected with the pumped storage system, the alternating current end of the direct current-alternating current conversion system is connected with an alternating current power grid, and the direct current-alternating current conversion system converts direct current electric energy output by the pumped storage system into alternating current electric energy meeting grid connection requirements.
Alternatively, for a specific implementation manner, the AC-DC conversion system may be an AC/DC module, and the DC-AC conversion module may include a DC/AC module and a grid-connected transformer, wherein a DC end of the DC/AC module is used as a DC end of the DC-AC conversion system and is connected to a DC end of the AC/DC module, an AC end of the DC/AC module is connected to a primary side connection end of the grid-connected transformer, and a secondary side connection end of the grid-connected transformer is used as an AC end of the DC-AC conversion system and is connected to an AC power grid.
It should be noted that other implementations that can achieve the above-mentioned power conversion requirement are optional, and the implementations also fall within the protection scope of the present invention without departing from the scope of the core idea of the present invention.
Based on the above, it can be seen that, according to the difference of the specific setting number of the ac-dc conversion system and the dc-ac conversion system, various combination modes can be implemented between the ac-dc conversion system and the dc-ac conversion system, so as to obtain a bidirectional electric energy conversion system capable of adapting to different electric energy conversion requirements.
Optionally, referring to fig. 4, the bidirectional electric energy conversion system provided by the embodiment shown in fig. 4 includes an ac-dc conversion system and a dc-ac conversion system, and in the case of reasonably selecting the capacities of the ac-dc conversion system and the dc-ac conversion system, the embodiment provides a large-capacity grid-connected power supply, and can provide sufficient electric energy support for an ac power grid.
Optionally, referring to fig. 5, the bidirectional power conversion system provided in the embodiment shown in fig. 5 includes an ac-dc conversion system and three dc-ac conversion systems, and the dc terminals of the dc-ac conversion systems are respectively connected to the dc terminals of the ac-dc conversion system.
In the case where the bidirectional electric energy conversion system includes a plurality of dc-ac conversion systems, the plurality of dc-ac conversion systems correspond to at least one voltage class. Taking the embodiment shown in fig. 5 as an example, two of the three dc-ac conversion systems correspond to one voltage class, and the other one corresponds to another voltage class, or the three dc-ac conversion systems correspond to one voltage class respectively, or the three dc-ac conversion systems correspond to the same voltage class. By selecting the direct current-alternating current conversion systems with different voltage grades, power output with different voltage grades can be realized, and further application scenes with different voltage requirements can be met.
Further, the embodiment shown in fig. 4 and the embodiment shown in fig. 5 can be combined to obtain the bidirectional power conversion system shown in fig. 6. As shown in fig. 6, the bidirectional electric energy conversion system includes two ac-dc conversion systems, and ac terminals of the two ac-dc conversion systems are connected in parallel and then connected to an ac terminal of the power generation device of the pumped storage system. As for the collocation manner and specific selection of the ac-dc conversion system and the dc-ac conversion system, the foregoing can be referred to, and details are not repeated herein.
Optionally, in practical application, the pumped storage system may include more than one power generation device, in this case, the bidirectional power conversion system may also flexibly select a configuration relationship among the ac-dc conversion system, the dc-ac-dc conversion system, and the power generation devices according to the specific number of the power generation devices, in this embodiment, the embodiment shown in fig. 7 is only one optional implementation manner, and in this embodiment, the pumped storage system includes two power generation devices, where the conversion system connected to the power generation device 1 adopts the implementation manner of the embodiment shown in fig. 4, and the conversion system connected to the power generation device 2 adopts the implementation manner provided by the embodiment shown in fig. 5. Of course, in practical applications, other specific configurations may be combined, which are not listed here, and the present invention also falls within the protection scope of the present invention without departing from the scope of the core idea of the present invention.
Optionally, the power generation system provided in any of the above embodiments may further include a system controller, where the system controller is respectively connected to the new energy power generation system, the pumped-hydro energy storage system, and the bidirectional electric energy conversion system, and is used to control working processes of the new energy power generation system, the pumped-hydro energy storage system, and the bidirectional electric energy conversion system.
Further, the present invention also provides a control method of a power generation system, which is used for controlling the operation process of the power generation system provided in any of the above embodiments, and when the power generation system is provided with a system controller, the control method can be applied to the system controller, and of course, can also be applied to other controllers independent of the power generation system.
Optionally, referring to fig. 8, fig. 8 is a flowchart of a power generation system control method provided in an embodiment of the present invention, where the flowchart of the power generation system control method provided in this embodiment may include:
and S100, acquiring an electric energy scheduling instruction.
According to the existing power grid power dispatching technology, a power dispatching instruction can be from at least one of a power grid dispatching energy controller, an automatic power generation control system AGC and an automatic voltage control system AVC, and in practical application, the power dispatching instruction mainly depends on a specific framework of an alternating current power grid connected to a power generation system. As for the specific obtaining manner of the electric energy scheduling instruction, for example, obtaining through network communication or obtaining through carrier communication is optional, and the present invention is not limited thereto.
And S110, responding to the electric energy scheduling instruction, and acquiring electric quantity parameters of a new energy power generation system and a pumped storage system in the power generation system.
In the embodiment of the invention, the electric quantity parameters of the new energy power generation system mainly comprise an electric quantity deviation adjustment coefficient and a predicted electric quantity and an electric quantity correction coefficient of each new energy power station in the new energy power generation system, and the electric quantity parameters of the pumped storage system mainly comprise rated stored electric quantity and stored electric quantity. It is understood that, in practical applications, the rated stored energy capacity should be equal to or greater than the sum of the predicted power generation capacity and the stored energy capacity.
When the predicted power generation amount of the new energy power generation system is obtained, the power deviation adjustment coefficient, the predicted power generation amount of each new energy power station in the new energy power generation system and the power correction coefficient can be obtained firstly, and then the predicted power generation amount of the new energy power generation system is calculated according to the following formula:
wherein, WyRepresenting a predicted power generation amount of the new energy power generation system;
Airepresenting the electric quantity correction coefficient of the ith new energy power station, wherein i belongs to [1, N ∈ [ ]]N is the total number of the new energy power stations, the coefficient is mainly set by considering the historical prediction deviation of the new energy power generation system, and the specific value of the coefficient is not limited;
Wiindicating the predicted power generation amount of the ith new energy power stationThe acquisition of the measured power generation amount can be realized based on the prior art, and the specific acquisition process of the predicted power generation amount is not limited;
and K represents an electric quantity deviation adjusting coefficient which is mainly used for online rolling correction of the predicted power and the actual total power of the new energy power station.
Both the nominal stored energy quantity and the stored energy quantity of the retraction energy storage system are available on the basis of the prior art and are not expanded here.
And S120, controlling the electric energy interaction of the new energy power generation system and the alternating current power grid according to the electric quantity parameter of the new energy power generation system and the electric quantity parameter of the pumped storage system.
There are many alternative specific implementations of S120 under different control requirements.
Optionally, a difference between the rated energy storage capacity and the predicted power generation capacity and the stored capacity can be calculated to obtain peak shaving capacity, and then the new energy power generation system and the alternating current power grid are controlled to carry out bidirectional peak shaving according to the peak shaving capacity.
Optionally, the sum of the predicted power generation amount and the stored power amount can be calculated to obtain the output power amount, and then the new energy power generation system is controlled to perform electric energy interaction with the alternating current power grid according to the output power amount.
Furthermore, real-time scheduling of the reactive power Q can be participated according to the grid-connected active power P and the system apparent power of the energy conversion system in real time, wherein constraint relation is satisfied
SnThe rated apparent power of the energy conversion system device.
In summary, the power generation system control method provided in the embodiment of the present invention can control the working processes of the new energy power generation system, the pumped-storage system and the bidirectional power conversion system in the power generation system based on the power generation system provided in the foregoing embodiment, so that the pumped-storage system aggregates the electric energy of the new energy power generation system, aggregates the small-capacity electric energy into the large-capacity water potential energy, and according to the electric energy scheduling instruction, outputs the electric energy to the ac power grid, aggregates the electric energy of the new energy power generation system by using the pumped-storage system, and realizes centralized output of the electric energy, thereby improving the consumption level of the new energy power generation system, offsetting the influence of the volatility and the intermittence of the new energy power generation system on the ac power grid, and further improving the operation stability of the ac power grid.
Furthermore, because the capacity of the pumped storage system is often far greater than the electric quantity that can be supplied by the new energy system, the fluctuation of the output electric energy of the new energy system can not influence the pumped storage system, therefore, the networking requirement of the new energy power generation system can be reduced, and the comprehensive utilization rate of the new energy power generation system can be further improved.
The embodiments of the invention are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments can be referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner. Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make numerous possible variations and modifications to the present teachings, or modify equivalent embodiments to equivalent variations, without departing from the scope of the present teachings, using the methods and techniques disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are still within the scope of the protection of the technical solution of the present invention, unless the contents of the technical solution of the present invention are departed.
Claims (18)
1. A power generation system, comprising: a new energy power generation system, a pumped storage system and a bidirectional electric energy conversion system, wherein,
the new energy power generation system comprises a plurality of new energy power stations which are dispersedly arranged;
each new energy power station is respectively connected with the pumped storage system;
the pumped storage system stores the total electric energy output by the new energy power generation system into water potential energy and converts the water potential energy into electric energy;
the bidirectional electric energy conversion system is connected between the pumped storage system and an alternating current power grid;
the bidirectional electric energy conversion system converts the electric energy output by the pumped storage system into electric energy meeting grid-connected requirements.
2. The power generation system of claim 1, wherein the type of new energy power plant comprises at least one of a photovoltaic power generation type and a wind power generation type.
3. The power generation system of claim 2, wherein the pumped-hydro energy storage system comprises: an energy storage and power generation system and at least one motor drive system, wherein,
the input end of the motor driving system is connected with at least one new energy power station;
the output end of the motor driving system is connected with the energy storage power generation system;
and the motor driving system is used for converting the electric energy output by the new energy power station into the electric energy meeting the operation requirement of the energy storage power generation system.
4. The power generation system of claim 3, wherein the motor drive system comprises at least one type, and any type of motor drive system is adapted to the electric energy output by the new energy power station to which it is connected.
5. The power generation system of claim 4, wherein the motor drive system is of a type that is at least one of an AC-DC-AC type drive system and a DC-AC type drive system.
6. The power generation system of claim 1, wherein the bi-directional power conversion system comprises at least one AC-to-DC conversion system and at least one DC-to-AC conversion system, wherein, in the event the pumped-storage system outputs AC power,
the alternating current end of the alternating current-direct current conversion system is connected with the pumped storage system, and the alternating current electric energy output by the pumped storage system is converted into direct current electric energy meeting preset conditions;
the direct current end of the direct current-alternating current conversion system is connected with the direct current end of the alternating current-direct current conversion system, and the alternating current end of the direct current-alternating current conversion system is connected with an alternating current power grid;
the direct current-alternating current conversion system converts the direct current electric energy meeting the preset conditions into alternating current electric energy meeting grid connection requirements;
in the case that the pumped-hydro energy storage system outputs direct current, the bidirectional electrical energy conversion system comprises at least one direct current-to-alternating current conversion system, wherein,
the direct current end of the direct current-alternating current conversion system is connected with the pumped storage system, and the alternating current end of the direct current-alternating current conversion system is connected with an alternating current power grid;
and the direct current-alternating current conversion system converts the direct current electric energy output by the pumped storage system into alternating current electric energy meeting grid connection requirements.
7. The power generation system of claim 6, wherein, where the bidirectional power conversion system comprises a plurality of the DC to AC conversion systems, the plurality of DC to AC conversion systems corresponds to at least one voltage level.
8. The power generation system of claim 6, wherein the dc-ac conversion system comprises: a DC/AC module and a grid-tie transformer, wherein,
the direct current end of the DC/AC module is used as the direct current end of the direct current-alternating current conversion system;
the alternating current end of the DC/AC module is connected with the primary side connecting end of the grid-connected transformer;
and the secondary side connecting end of the grid-connected transformer is used as an alternating current end of the direct current-alternating current conversion system.
9. The power generation system of claim 6, wherein the AC-DC conversion system comprises an AC/DC module;
in the case where the bidirectional electric energy conversion system includes a plurality of the ac-dc conversion systems, the ac connection terminals of the respective ac-dc conversion systems are connected in parallel.
10. The power generation system of claim 7, wherein the ac terminals of the dc-ac conversion systems corresponding to the same voltage level are connected in parallel.
11. The power generation system of claim 3, wherein the energy storage and generation system comprises an energy storage system and a potential energy generation system, wherein,
the energy storage system stores the electric energy output by the new energy power generation system into water potential energy;
the potential energy power generation system converts water potential energy into electric energy.
12. The power generation system of claim 11, wherein the energy storage system comprises a feed water pump and a multi-stage buffer reservoir, wherein,
the driving end of the water inlet pump is connected with the motor driving system;
the water inlet pump stores the water with low potential energy in the multistage buffer pool as the water with high potential energy by utilizing the electric energy output by the new energy power generation system;
the potential energy power generation system comprises a power generation device, wherein,
the power generation device converts water potential energy into electric energy in the process of releasing water in the multi-stage buffer pool.
13. The power generation system of claim 12, wherein the multi-stage buffer pool comprises a plurality of storage pools, and wherein the storage pools have different potential energies.
14. A control method of a power generation system, applied to the power generation system according to any one of claims 1 to 13, the method comprising:
acquiring an electric energy scheduling instruction;
responding to the electric energy scheduling instruction, and acquiring electric quantity parameters of a new energy power generation system and a pumped storage system in the power generation system;
and controlling the electric energy interaction of the new energy power generation system and an alternating current power grid according to the electric quantity parameter of the new energy power generation system and the electric quantity parameter of the pumped storage system.
15. The control method of an electric power generation system according to claim 14, wherein the parameter of the amount of electric power of the new energy electric power generation system includes a predicted amount of electric power generation;
the process of obtaining the electric quantity parameter of the new energy power generation system comprises the following steps:
acquiring an electric quantity deviation adjustment coefficient, and a predicted generated energy and an electric quantity correction coefficient of each new energy power station in the new energy power generation system;
calculating the predicted power generation amount of the new energy power generation system according to the following formula:
wherein, WyRepresenting a predicted power generation amount of the new energy power generation system;
Airepresenting the electric quantity correction coefficient of the ith new energy power station, wherein i belongs to [1, N ∈ [ ]]N is the total number of the new energy power station;
Wirepresenting the predicted power generation amount of the ith new energy power station;
k represents the electric quantity deviation adjustment coefficient.
16. The control method of an electric power generation system according to claim 14, wherein the parameter of the amount of electric power of the new energy electric power generation system includes a predicted amount of electric power generation;
the electric quantity parameters of the pumped storage system comprise rated storage electric quantity and stored electric quantity;
according to the electric quantity parameter of the new energy power generation system and the electric quantity parameter of the pumped storage system, controlling the electric energy interaction of the new energy power generation system and an alternating current power grid, and the method comprises the following steps:
calculating the difference value between the rated energy storage electric quantity and the predicted power generation amount and the stored electric quantity to obtain peak shaving electric quantity;
and controlling the new energy power generation system and the alternating current power grid to carry out bidirectional peak shaving according to the peak shaving electric quantity.
17. The method for controlling the power generation system according to claim 16, wherein the step of controlling the electric energy interaction between the new energy power generation system and the ac power grid according to the electric quantity parameter of the new energy power generation system and the electric quantity parameter of the pumped-hydro energy storage system further comprises the steps of:
calculating the sum of the predicted generated energy and the stored electric energy to obtain the electric energy which can be output;
and controlling the new energy power generation system to perform electric energy interaction with an alternating current power grid according to the output electric quantity.
18. The control method of a power generation system according to claim 14, wherein the obtaining of the power scheduling instruction includes:
and acquiring an electric energy scheduling instruction of at least one of the power grid scheduling energy controller, the automatic generation control system AGC and the automatic voltage control system AVC.
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