CN115065082A - Method, system, equipment and medium for constructing main loop of battery energy storage power station - Google Patents

Method, system, equipment and medium for constructing main loop of battery energy storage power station Download PDF

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Publication number
CN115065082A
CN115065082A CN202210743448.7A CN202210743448A CN115065082A CN 115065082 A CN115065082 A CN 115065082A CN 202210743448 A CN202210743448 A CN 202210743448A CN 115065082 A CN115065082 A CN 115065082A
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energy storage
battery
power station
bridge modules
parallel
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李勇琦
史尤杰
李毓烜
吴越
雷旗开
邹常跃
叶复萌
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CSG Electric Power Research Institute
Peak and Frequency Regulation Power Generation Co of China Southern Power Grid Co Ltd
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CSG Electric Power Research Institute
Peak and Frequency Regulation Power Generation Co of China Southern Power Grid Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/28—Arrangements for balancing of the load in a network by storage of energy
    • H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]

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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 method, a system, equipment and a medium for constructing a main loop of a battery energy storage power station. And determining the total number of the H-bridge modules and the parallel number of the cascaded multi-level energy storage converters according to preset power grid connection parameters and the initial total number of the H-bridge modules, and constructing a main loop of the battery energy storage power station by combining the information of the number of the batteries. According to the invention, the required target battery monomer number, the total number of H-bridge modules and the parallel number of the cascaded multi-level energy storage converters are calculated according to the information such as the capacity requirement of the energy storage power station, the grid connection parameters and the like, so that the technical requirement of the main loop of the battery energy storage power station based on the cascaded multi-level topology is met.

Description

Method, system, equipment and medium for constructing main loop of battery energy storage power station
Technical Field
The invention relates to the technical field of construction of a main loop of a battery energy storage power station, in particular to a method, a system, equipment and a medium for constructing the main loop of the battery energy storage power station.
Background
The battery energy storage system has quick response and flexible adjustment, can be applied to each link of power generation, transmission, distribution and use of the power system, can effectively solve the power balance problem and the system stability risk caused by the grid connection of a large amount of new energy, and becomes important technology and basic equipment for supporting and constructing a novel power system and assisting in realizing a double-carbon target. The capacity grade of a single cascaded multi-level battery energy storage system is about 10MWh, while the capacity of a conventional centralized low-voltage energy storage system based on two levels or three levels is only 1MWh at most. For a battery energy storage power station with the future scale reaching hundreds of megawatts, compared with the conventional centralized low-voltage topology, the cascaded multi-level battery converter is adopted as the topology of the energy storage power converter, so that the parallel connection quantity of the power converters can be greatly reduced, and the problems of resonance and the like caused by parallel connection of multiple machines are effectively avoided.
At present, a common design method of a main loop of a battery energy storage power station is suitable for a conventional low-voltage energy storage system based on two levels or three levels, and due to differences in topological structures of the main loop, the method cannot be directly applied to the battery energy storage power station based on the cascade multilevel topology, but the design method of the main loop of the battery energy storage power station based on the cascade multilevel topology is rarely reported.
Disclosure of Invention
The invention provides a method, a system, equipment and a medium for constructing a main loop of a battery energy storage power station, and solves the technical problem that the method for constructing the main loop of the battery energy storage power station based on cascade multilevel topology is lacked at present.
The invention provides a method for constructing a main loop of a battery energy storage power station, which comprises the following steps:
when energy storage power station capacity demand information is received, performing type selection on a target battery monomer according to the energy storage power station capacity demand information;
determining battery quantity information of the target battery monomer based on the maximum working voltage corresponding to the target battery monomer and the capacity demand information of the energy storage power station;
determining the total number of initial H-bridge modules according to the battery quantity information, the energy storage power station capacity demand information and the battery monomer parameters corresponding to the target battery monomer;
determining the number of H-bridge modules, the total number of H-bridge modules and the parallel number of cascaded multi-level energy storage converters required by a single cascaded multi-level energy storage converter according to preset power grid connection parameters and the initial total number of H-bridge modules;
and constructing a battery energy storage power station main loop based on the cascade multilevel topology by adopting the H-bridge modules with the number corresponding to the total number of the H-bridge modules and the target battery monomers with the number corresponding to the battery number information and combining the parallel number of the cascade multilevel energy storage converters and the number of the H-bridge modules.
Optionally, the energy storage power station capacity demand information includes total capacity of the energy storage power station, power station power, preset power semiconductor device voltage information and battery cell interface number information; the step of determining the battery quantity information of the target battery monomer based on the maximum working voltage corresponding to the target battery monomer and the energy storage power station capacity demand information includes:
calculating the ratio of the total capacity of the energy storage power station to the power station power to obtain the discharge time of the battery energy storage power station;
determining the number of parallel battery branches corresponding to the target battery monomer according to the discharge duration;
and determining the number of the single-circuit series battery monomers corresponding to the target battery monomer according to the preset power semiconductor device voltage information, the maximum working voltage corresponding to the target battery monomer and the battery monomer interface number information.
Optionally, the step of determining the number of parallel battery branches corresponding to the target battery cell according to the discharge duration includes:
matching a corresponding target application scene from a preset scene information table by using the discharge duration as a keyword;
and determining the number of the parallel battery branches corresponding to the target application scene as the number of the parallel battery branches corresponding to the target battery monomer.
Optionally, the preset power semiconductor device voltage information includes a preset power semiconductor device rated voltage and a preset power semiconductor device voltage margin; the step of determining the number of the single-circuit series battery monomers corresponding to the target battery monomer according to the preset power semiconductor device voltage information, the maximum working voltage corresponding to the target battery monomer and the battery monomer interface number information includes:
calculating the ratio of the rated voltage of the preset power semiconductor device, the voltage margin of the preset power semiconductor device and the maximum working voltage corresponding to the target battery monomer to obtain the number of the initial single-circuit series battery monomers;
selecting a minimum multiple value larger than the number of the initial single-circuit series battery monomers from multiple values corresponding to the battery monomer interface number information;
and determining the minimum multiple value as the number of the single-circuit series battery monomers corresponding to the target battery monomer.
Optionally, the cell parameters include cell rated voltage and cell capacity; the step of determining the total number of the initial H-bridge modules according to the battery quantity information, the energy storage power station capacity demand information and the battery monomer parameters corresponding to the target battery monomer comprises the following steps:
calculating the battery quantity information, the rated voltage of the single battery and the capacity of the single battery to obtain the rated module capacity corresponding to the single H-bridge module;
and calculating the ratio of the total capacity of the energy storage power station corresponding to the energy storage power station capacity demand information to the capacity of the rated module, and determining the total number of the initial H-bridge modules.
Optionally, the step of determining the number of H-bridge modules, the total number of H-bridge modules, and the parallel number of cascaded multi-level energy storage converters required by a single cascaded multi-level energy storage converter according to preset grid-connected parameters and the initial total number of H-bridge modules includes:
substituting preset grid-connected parameters into a preset single-phase H-bridge module number calculation formula of a single cascaded multi-level energy storage converter, and determining the number of H-bridge modules required by the single cascaded multi-level energy storage converter;
calculating the ratio of the total number of the initial H-bridge modules to the number of the H-bridge modules to obtain a module ratio;
performing rounding operation on the module ratio to obtain the parallel number of the downward rounding cascade multi-level energy storage converters and the parallel number of the upward rounding cascade multi-level energy storage converters;
calculating the total number of the actual H-bridge modules required by the parallel connection number of the downward rounding cascade multilevel energy storage converters to obtain a corresponding first initial number;
calculating the total number of the actual H-bridge modules required by the parallel connection number of the upward rounding cascade multi-level energy storage converters to obtain a second initial number;
comparing the first initial quantity and the second initial quantity;
if the first initial number is larger than the second initial number, taking the second initial number as the total number of the H-bridge modules, and taking the parallel number of the upward rounding cascade multi-level energy storage converters as the parallel number of the cascade multi-level energy storage converters;
and if the first initial quantity is smaller than the second initial quantity, taking the first initial quantity as the total number of the H-bridge modules, and taking the parallel quantity of the downward-rounded cascaded multi-level energy storage converters as the parallel quantity of the cascaded multi-level energy storage converters.
Optionally, the step of constructing a battery energy storage power station main loop based on a cascade multilevel topology by using the H-bridge modules corresponding to the total number of the H-bridge modules and the target single batteries corresponding to the battery number information and combining the parallel number of the cascade multilevel energy storage converters and the number of the H-bridge modules includes:
constructing a battery branch by adopting target battery monomers corresponding to the number of the single-path series battery monomers;
selecting H bridge modules corresponding to the total number of the H bridge modules;
respectively connecting the battery branches to the direct current side of each H-bridge module according to the number of the parallel battery branches, and combining the number of the H-bridge modules to obtain a single cascaded multi-level energy storage converter;
and connecting all the cascaded multi-level energy storage converters in parallel according to the parallel quantity of the cascaded multi-level energy storage converters, and connecting the cascaded multi-level energy storage converters into a bus corresponding to the battery energy storage power station to obtain a main loop of the battery energy storage power station.
The invention also provides a battery energy storage power station main loop construction system, which comprises:
the target battery monomer selection module is used for selecting the type of a target battery monomer according to the capacity demand information of the energy storage power station when the capacity demand information of the energy storage power station is received;
the battery number information determining module is used for determining the battery number information of the target battery monomer based on the maximum working voltage corresponding to the target battery monomer and the capacity demand information of the energy storage power station;
the initial H-bridge module total number determining module is used for determining the initial H-bridge module total number according to the battery number information, the energy storage power station capacity demand information and the battery monomer parameters corresponding to the target battery monomer;
the H-bridge module quantity information and cascaded multi-level energy storage converter parallel quantity determining module is used for determining the quantity of H-bridge modules, the total quantity of H-bridge modules and the cascaded multi-level energy storage converter parallel quantity required by a single cascaded multi-level energy storage converter according to preset power grid connection parameters and the initial H-bridge module total quantity;
and the battery energy storage power station main loop construction module is used for constructing a battery energy storage power station main loop based on the cascade multilevel topology by adopting the H bridge modules with the number corresponding to the total number of the H bridge modules and the target battery monomers with the number corresponding to the battery number information and combining the parallel number of the cascade multilevel energy storage converters and the number of the H bridge modules.
The invention also provides an electronic device, which comprises a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor executes the steps of implementing the method for constructing the main loop of the battery energy storage power station.
The invention also provides a computer readable storage medium, on which a computer program is stored, which when executed implements any one of the battery energy storage station main loop construction methods described above.
According to the technical scheme, the invention has the following advantages:
according to the method and the device, when the energy storage power station capacity demand information is received, the type of the target battery monomer is selected according to the energy storage power station capacity demand information, and the battery quantity information of the target battery monomer is determined based on the maximum working voltage corresponding to the target battery monomer and the energy storage power station capacity demand information. And determining the total number of the initial H-bridge modules according to the battery quantity information, the energy storage power station capacity demand information and the battery monomer parameters corresponding to the target battery monomer. And determining the number of the H-bridge modules, the total number of the H-bridge modules and the parallel number of the cascaded multi-level energy storage converters required by a single cascaded multi-level energy storage converter according to preset grid connection parameters and the initial total number of the H-bridge modules. And constructing a battery energy storage power station main loop based on the cascade multilevel topology by adopting the H bridge modules with the number corresponding to the total number of the H bridge modules and the target battery monomers with the number corresponding to the battery number information and combining the parallel number of the cascade multilevel energy storage converters and the number of the H bridge modules. The technical problem that a main loop construction method for a battery energy storage power station based on a cascade multilevel topology is lacked at present is solved. According to the invention, the number of target battery monomers, the number of H-bridge modules, the total number of H-bridge modules and the parallel number of cascaded multi-level energy storage converters required by an energy storage power station subsystem are calculated according to the information such as the capacity requirement of the energy storage power station, the grid-connected parameters and the like, so that the technical requirement of constructing a main circuit of the battery energy storage power station based on cascaded multi-level topology is met.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and 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 these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a battery energy storage converter based on a cascade multilevel topology according to an embodiment of the present invention;
fig. 2 is a flowchart illustrating steps of a method for constructing a main circuit of a battery energy storage power station according to an embodiment of the present invention;
fig. 3 is a flowchart illustrating steps of a method for constructing a main circuit of a battery energy storage power station according to a second embodiment of the present invention;
FIG. 4 is a schematic circuit diagram of a battery branch according to a second embodiment of the present invention;
FIG. 5 is a diagram of the main circuit of the battery energy storage power station according to the second embodiment of the present invention;
fig. 6 is a structural block diagram of a main loop construction system of a battery energy storage power station according to a third embodiment of the present invention.
Detailed Description
The embodiment of the invention provides a method, a system, equipment and a medium for constructing a main loop of a battery energy storage power station, which are used for solving the technical problem that the method for constructing the main loop of the battery energy storage power station based on cascade multilevel topology is lacked at present.
As shown in fig. 1, the cascaded multi-level converter topology is composed of a plurality of H-bridge modules, the dc sides of the H-bridge modules have low voltage levels and are independent of each other, the ac sides are connected in series to form an ac multi-level high voltage, and the cascaded multi-level converter topology has good harmonic characteristics, does not need a step-up transformer, and has a modular structureThe method has the advantages of easy redundancy and the like, and is very suitable for being used as a power conversion link of a medium-high voltage and large-capacity battery energy storage system. A plurality of target batteries connected in parallel on the direct current side of the H-bridge module are collectively called as battery units, and the cascaded multi-level battery energy storage system is a three-phase system and comprises a plurality of H-bridge modules (namely, an H-bridge module A) 1 H bridge module A 2 .. N ) The system comprises a plurality of battery units, an A-phase circuit, a B-phase circuit, a C-phase short circuit, a starting loop and a 10kV power grid. The A-phase circuit, the B-phase circuit and the C-phase short circuit are connected in parallel and are respectively connected with the battery unit in parallel, and the A-phase circuit, the B-phase circuit and the C-phase short circuit output end are respectively connected with the inductor L g Connected to output currents i a 、i b And i c And the output end is connected with the starting loop and is connected into a 10kV power grid.
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the embodiments described below 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.
Referring to fig. 2, fig. 2 is a flowchart illustrating a method for constructing a main circuit of a battery energy storage station according to an embodiment of the present invention.
The invention provides a method for constructing a main loop of a battery energy storage power station, which comprises the following steps:
and step 201, when the energy storage power station capacity demand information is received, selecting the type of the target battery monomer according to the energy storage power station capacity demand information.
The energy storage power station capacity demand information comprises total capacity of the energy storage power station, power station power, preset power semiconductor device voltage information and single battery interface quantity information.
In the embodiment of the invention, when the energy storage power station capacity demand information is received, the target battery monomer for constructing the main loop of the battery energy storage power station is subjected to type selection according to the total capacity and the power station power of the energy storage power station in the energy storage power station capacity demand information.
Step 202, determining the battery quantity information of the target battery monomer based on the maximum working voltage corresponding to the target battery monomer and the capacity requirement information of the energy storage power station.
The battery quantity information comprises the quantity of parallel battery branches corresponding to the target battery monomer and the quantity of single serial battery monomers, wherein the quantity of the parallel battery branches refers to the parallel quantity of the battery branches connected with the direct current side of a single H-bridge module; the number of the single-circuit series battery monomers refers to the number of the target battery monomers in series on each battery branch.
In the embodiment of the invention, the ratio of the total capacity of the energy storage power station to the power of the power station is calculated to obtain the discharge time of the battery energy storage power station, and the number of the parallel battery branches corresponding to the target battery monomer is determined according to the discharge time. The method comprises the steps of carrying out ratio on a preset power semiconductor device rated voltage, a preset power semiconductor device voltage margin and a maximum working voltage corresponding to a target battery monomer to obtain the number of the initial single-circuit series battery monomers, selecting a minimum multiple value larger than the number of the initial single-circuit series battery monomers by combining the information of the number of battery monomer interfaces, and determining the minimum multiple value as the number of the single-circuit series battery monomers corresponding to the target battery monomer.
And 203, determining the total number of the initial H-bridge modules according to the battery quantity information, the energy storage power station capacity demand information and the battery monomer parameters corresponding to the target battery monomer.
The battery monomer parameters corresponding to the target battery monomer refer to the rated voltage and the capacity of the battery monomer. The initial total number of the H-bridge modules refers to the ratio of the total capacity of the energy storage power station of the battery energy storage power station to the rated voltage of the battery monomer of the target battery monomer, the capacity of the battery monomer, the number of parallel battery branches and the number of single-circuit series battery monomers.
In the embodiment of the invention, the number of parallel battery branches, the number of single-circuit series battery monomers, the rated voltage of the battery monomers and the capacity of the battery monomers are multiplied to obtain the capacity of a rated module corresponding to a single H-bridge module, the total energy storage capacity of a battery energy storage power station is subjected to ratio to the capacity of the rated module corresponding to the single H-bridge module, and the result of the ratio is determined as the total number of the initial H-bridge modules.
And 204, determining the number of the H-bridge modules, the total number of the H-bridge modules and the parallel number of the cascaded multi-level energy storage converters required by a single cascaded multi-level energy storage converter according to preset grid connection parameters and the initial total number of the H-bridge modules.
The preset power grid-connected parameters comprise a grid-connected line voltage effective value, a power grid voltage maximum fluctuation rate, a power grid voltage maximum unbalance degree, an alternating current filter inductor per unit value, an alternating current filter inductor manufacturing error, an inverter maximum modulation ratio, a maximum amplitude of an H-bridge module direct current capacitor voltage secondary ripple, a minimum working voltage of an H-bridge module direct current side battery unit and module redundancy.
The total number of the H-bridge modules refers to the total number of the H-bridge modules contained in the finally determined energy storage power station. The parallel connection quantity of the cascaded multi-level energy storage converters refers to the parallel connection quantity of the cascaded multi-level energy storage converters in a main loop of the battery energy storage power station.
In the embodiment of the invention, the preset grid-connected parameters are substituted into a preset single-phase H-bridge module quantity calculation formula of a single cascaded multi-level energy storage converter, the quantity of H-bridge modules required by the single cascaded multi-level energy storage converter is determined, the ratio of the initial total number of H-bridge modules to the quantity of H-bridge modules required by the single cascaded multi-level energy storage converter is obtained, the rounding operation is carried out on the module ratio, and the parallel quantity of the cascaded multi-level energy storage converters which are rounded downwards and the parallel quantity of the cascaded multi-level energy storage converters which are rounded upwards are obtained by combining module redundancy. And comparing the actual total number of the H-bridge modules required by the parallel number of the downward rounding cascade multi-level energy storage converters with the actual total number of the H-bridge modules required by the parallel number of the upward rounding cascade multi-level energy storage converters, and determining the total number of the H-bridge modules and the parallel number of the cascade multi-level energy storage converters according to the comparison result.
And step 205, constructing a battery energy storage power station main loop based on the cascade multilevel topology by adopting the H bridge modules with the number corresponding to the total number of the H bridge modules and the target battery monomers with the number corresponding to the battery number information and combining the parallel number of the cascade multilevel energy storage converters and the number of the H bridge modules.
The main circuit of the battery energy storage power station is constructed by connecting a corresponding number of H-bridge modules, target batteries and preset power semiconductor devices according to the capacity demand information of the energy storage power station.
In the embodiment of the invention, the target battery monomers corresponding to the number of the single-path series battery monomers are adopted to construct the battery branches, the H-bridge modules corresponding to the total number of the H-bridge modules are selected, the battery branches are respectively connected to the direct current side of each H-bridge module according to the number of the parallel battery branches, and the single-path H-bridge modules of the single cascade multilevel energy storage converter are combined to obtain the single cascade multilevel energy storage converter. And then, connecting all the cascaded multi-level energy storage converters in parallel according to the parallel number of the single cascaded multi-level energy storage converter, and connecting the cascaded multi-level energy storage converters into a bus corresponding to the battery energy storage power station to obtain a main loop of the battery energy storage power station.
In the embodiment of the invention, when the capacity demand information of the energy storage power station is received, the type of the target single battery is selected according to the capacity demand information of the energy storage power station, and the battery quantity information of the target single battery is determined based on the maximum working voltage corresponding to the target single battery and the capacity demand information of the energy storage power station. And determining the total number of the initial H-bridge modules according to the battery quantity information, the energy storage power station capacity demand information and the battery monomer parameters corresponding to the target battery monomer. And determining the number of H-bridge modules, the total number of H-bridge modules and the parallel number of cascaded multi-level energy storage converters required by a single cascaded multi-level energy storage converter according to preset grid connection parameters and the initial total number of H-bridge modules. The method comprises the steps of constructing a battery energy storage power station main loop based on cascade multilevel topology by adopting H bridge modules with the number corresponding to the total number of the H bridge modules and target battery monomers with the number corresponding to battery number information and combining the parallel number of cascade multilevel energy storage converters and the number of the H bridge modules. The technical problem that a main loop construction method for a battery energy storage power station based on a cascade multilevel topology is lacked at present is solved. According to the invention, the number of target single batteries, the number of H-bridge modules, the total number of H-bridge modules and the parallel number of cascaded multi-level energy storage converters required by an energy storage power station subsystem are calculated according to the information such as the capacity requirement of the energy storage power station, the grid-connected parameters and the like, so that the technical requirement of constructing a main loop of the battery energy storage power station based on cascaded multi-level topology is met.
Referring to fig. 3, fig. 3 is a flowchart illustrating a method for constructing a main circuit of a battery energy storage station according to a second embodiment of the present invention.
And 301, when the energy storage power station capacity demand information is received, selecting the type of the target battery monomer according to the energy storage power station capacity demand information.
In the embodiment of the invention, when the total capacity of the energy storage power station, the power station power, the preset power semiconductor device voltage information and the number information of the battery monomer interfaces are received, the type of the target battery monomer for constructing the main loop of the battery energy storage power station is selected according to the total capacity of the energy storage power station and the power station power.
Step 302, determining the battery quantity information of the target battery monomer based on the maximum working voltage corresponding to the target battery monomer and the capacity demand information of the energy storage power station.
Optionally, step 302 may include the following sub-steps S11-S13:
and S11, calculating the ratio of the total capacity of the energy storage power station to the power of the power station to obtain the discharge duration of the battery energy storage power station.
In the embodiment of the invention, the total capacity of the energy storage power station and the power station power in the capacity demand information of the energy storage power station are subjected to ratio, and the ratio result is determined as the discharge duration of the battery energy storage power station.
And S12, determining the number of parallel battery branches corresponding to the target battery monomer according to the discharge duration.
Further, step S12 may include the following sub-steps S121-S122:
and S121, matching the corresponding target application scene from a preset scene information table by using the discharge duration as a keyword.
The preset scene information table is a table which is made by dividing charging and discharging application scenes corresponding to a plurality of electric fields and corresponding battery branches according to different discharging durations of the battery energy storage power station and by combining the parallel connection number of the common battery branches within 1-4 paths, and common charging and discharging application scenes comprise small current, long-time charging and discharging application scenes, large current, short-time charging and discharging application scenes and the like.
In the embodiment of the invention, the ratio of the total capacity of the energy storage power station to the power of the power station is calculated to obtain the discharge duration. And taking the discharge duration as a keyword, finding a charge and discharge application scene corresponding to the discharge duration from a preset scene information table, and setting the charge and discharge scene as a target application scene.
And S122, determining the number of the parallel battery branches corresponding to the target application scene as the number of the parallel battery branches corresponding to the target battery monomer.
In the embodiment of the invention, when the target application scene is determined, the number of the parallel battery branches corresponding to the target application scene is selected from the preset information table, and the number of the parallel battery branches is determined as the number of the parallel battery branches corresponding to the target battery monomer.
And S13, determining the number of the single-circuit series battery monomers corresponding to the target battery monomer according to the preset voltage information of the power semiconductor device, the maximum working voltage corresponding to the target battery monomer and the number information of the battery monomer interfaces.
Further, the preset power semiconductor device voltage information includes a preset power semiconductor device rated voltage and a preset power semiconductor device voltage margin, and the step S13 may include the following substeps S131-S133:
s131, calculating the ratio of the rated voltage of the preset power semiconductor device, the voltage margin of the preset power semiconductor device and the maximum working voltage corresponding to the target battery monomer to obtain the number of the initial single-circuit series battery monomers.
The preset rated voltage of the power semiconductor device is the rated working voltage of the power semiconductor device to be used. The preset power semiconductor device voltage margin refers to the maximum voltage margin of the power semiconductor device to be used in the design, for example, the voltage margin of a switching device in a general converter is designed to be 1.7-2, and the preset power semiconductor device voltage margin can be 2. The maximum operating voltage corresponding to the target cell means a maximum voltage value that can be achieved in a voltage operating range of the target cell.
In the embodiment of the invention, the maximum working voltage of the target battery monomer in the voltage working range is selected, and the ratio of the rated voltage of the preset power semiconductor device, the voltage margin of the preset power semiconductor device and the maximum working voltage corresponding to the target battery monomer is calculated to obtain the number of the initial single-circuit series battery monomers.
S132, selecting a minimum multiple value larger than the number of the initial single-circuit series battery monomers from multiple values corresponding to the battery monomer interface number information.
The information of the number of the battery cell interfaces refers to a plurality of times of values set according to the information of the number of the battery cell interfaces in a common Battery Management System (BMS), the number of the battery cell interfaces is generally 8 or 16, and a plurality of times of values corresponding to 8 and 16 are generated.
In the embodiment of the invention, the minimum multiple value which is larger than the number of the initial single-circuit series-connected battery monomers and is calculated by the rated voltage of the preset power semiconductor device, the voltage margin of the preset power semiconductor device and the maximum working voltage corresponding to the target battery monomer is selected from multiple values corresponding to the number information of the battery monomer interfaces.
And S133, determining the minimum multiple value as the number of the single-circuit series battery monomers corresponding to the target battery monomer.
In the embodiment of the invention, after the minimum multiple value which is larger than the number of the initial single-circuit series battery monomers is selected from the multiple values corresponding to the battery monomer interface number information, the minimum multiple value is set as the number of the single-circuit series battery monomers corresponding to the target battery.
And step 303, calculating the number information of the batteries, the rated voltage of the single battery and the capacity of the single battery to obtain the rated module capacity corresponding to the single H-bridge module.
In the embodiment of the invention, the battery number information comprises the number of parallel battery branches corresponding to the target battery monomer and the number of single-circuit series battery monomers, and the product of the rated voltage of the battery monomer, the capacity of the battery monomer, the number of the parallel battery branches and the number of the single-circuit series battery monomers is calculated to obtain the rated module capacity corresponding to a single H-bridge module.
And 304, calculating the ratio of the total capacity of the energy storage power station corresponding to the energy storage power station capacity demand information to the rated module capacity, and determining the total number of the initial H-bridge modules.
In the embodiment of the invention, the ratio of the total capacity of the energy storage power station in the power station capacity demand information to the rated module capacity corresponding to a single H-bridge module is calculated to obtain the total number of H-bridge modules at least required by the battery energy storage power station, namely the total number of initial H-bridge modules.
And 305, determining the number of the H-bridge modules, the total number of the H-bridge modules and the parallel number of the cascaded multi-level energy storage converters required by a single cascaded multi-level energy storage converter according to preset grid connection parameters and the initial total number of the H-bridge modules.
Optionally, step 305 may include the following sub-steps S21-S28:
and S21, substituting the preset grid connection parameters into a preset single-phase H-bridge module number calculation formula of the single cascade multilevel energy storage converter, and determining the number of H-bridge modules required by the single cascade multilevel energy storage converter.
The preset calculation formula of the number of single-phase H-bridge modules of a single cascaded multilevel energy storage converter is as follows:
Figure BDA0003718853780000121
wherein, U sl The sub-module is a sub-module, and is characterized in that the sub-module is a grid-connected line voltage effective value, lambda is a grid voltage maximum fluctuation rate, delta is a grid voltage maximum unbalance degree, chi is an alternating current filter inductor per unit value, epsilon is an alternating current filter inductor manufacturing error, M is an inverter maximum modulation ratio, alpha is a sub-module direct current capacitor voltage secondary ripple maximum amplitude value, and U is a sub-module direct current capacitor voltage secondary ripple maximum amplitude value bat_min The lowest working voltage of the direct-current side battery unit of the H-bridge module is shown, and gamma is the module redundancy.
In the embodiment of the invention, the number of single-phase H-bridge modules is obtained by calculation by substituting preset grid-connected parameters into a preset single-phase H-bridge module number calculation formula of a single cascaded multilevel energy storage converter, and since a three-phase system is used in a main loop of a battery energy storage power station, the number of single-phase H-bridge modules is multiplied by three to obtain the required number of H-bridge modules of the single cascaded multilevel energy storage converter, and the number of redundant modules in the number of H-bridge modules is calculated through module redundancy.
And S22, calculating the ratio of the total number of the initial H-bridge modules to the number of the H-bridge modules to obtain a module ratio.
The module ratio is the initial parallel connection quantity corresponding to the energy storage power station cascade multilevel energy storage converter obtained by calculating the ratio of the total number of the initial H bridge modules and the number of the H bridge modules required by a single cascade multilevel energy storage converter.
In the embodiment of the invention, the total capacity of the energy storage power station and the rated module capacity corresponding to a single H-bridge module are calculated to obtain the total number of the initial H-bridge modules, the ratio of the total number of the initial H-bridge modules to the number of the H-bridge modules required by a single cascaded multi-level energy storage converter is carried out, and the initial parallel number corresponding to the cascaded multi-level energy storage converter of the energy storage power station is determined.
And S23, rounding the module ratio to obtain the parallel number of the downward rounding cascade multi-level energy storage converters and the parallel number of the upward rounding cascade multi-level energy storage converters.
In the embodiment of the invention, because the ratio of the total number of the initial H-bridge modules to the number of the H-bridge modules required by a single cascaded multi-level energy storage converter usually has decimal, the module ratio needs to be rounded to obtain the parallel number of the downwards rounded cascaded multi-level energy storage converters and the parallel number of the upwards rounded cascaded multi-level energy storage converters.
And S24, calculating the total number of the actual H-bridge modules required by the parallel number of the downward rounding cascade multilevel energy storage converters to obtain a corresponding first initial number.
The first initial number refers to the actual total number of the H-bridge modules required by all the cascaded multi-level energy storage converters when the parallel number of the cascaded multi-level energy storage converters is rounded down.
In the embodiment of the invention, when the parallel number of the cascaded multi-level energy storage converters is rounded downwards, the number of H-bridge modules required by a single cascaded multi-level energy storage converter is correspondingly adjusted according to the obtained parallel number, so that a corresponding first initial number is obtained.
And S25, calculating the total number of the actual H-bridge modules required by the upper rounding cascade multi-level energy storage converter in parallel connection to obtain a corresponding second initial number.
The second initial number refers to the actual total number of the H-bridge modules required by all the cascaded multi-level energy storage converters when the parallel number is the upper rounded parallel number of the cascaded multi-level energy storage converters.
In the embodiment of the invention, when the parallel number of the cascaded multi-level energy storage converters is rounded upwards, the number of H-bridge modules required by a single cascaded multi-level energy storage converter is correspondingly adjusted according to the obtained parallel number, so that a corresponding second initial number is obtained.
And S26, comparing the first initial quantity with the second initial quantity.
In the embodiment of the invention, as the number of the target battery monomers increases sharply along with the increase of the number of the H-bridge modules, the amount of data to be processed by the energy storage station controller increases in multiples, and therefore, the first initial number and the second initial number need to be compared, and the value of the first initial number and the second initial number is selected to be smaller.
And S27, if the first initial quantity is larger than the second initial quantity, taking the second initial quantity as the total number of the H-bridge modules, and taking the parallel quantity of the upward-rounded cascaded multi-level energy storage converters as the parallel quantity of the cascaded multi-level energy storage converters.
In the embodiment of the invention, the first initial number is compared with the second initial number, when the first initial number is greater than the second initial number, the second initial number is used as the total number of the H-bridge modules, and the parallel number of the upward rounding cascade multi-level energy storage converters is used as the parallel number of the cascade multi-level energy storage converters.
And S28, if the first initial quantity is smaller than the second initial quantity, taking the first initial quantity as the total number of the H-bridge modules, and taking the parallel quantity of the downward-rounded cascaded multi-level energy storage converters as the parallel quantity of the cascaded multi-level energy storage converters.
In the embodiment of the invention, the first initial number is compared with the second initial number, when the first initial number is smaller than the second initial number, the first initial number is used as the total number of the H-bridge modules, and the parallel number of the downward rounded cascaded multi-level energy storage converters is used as the parallel number of the cascaded multi-level energy storage converters.
And step 306, constructing a battery energy storage power station main loop based on the cascade multilevel topology by adopting the H bridge modules with the number corresponding to the total number of the H bridge modules and the target battery monomers with the number corresponding to the battery number information and combining the parallel number of the cascade multilevel energy storage converters and the number of the H bridge modules.
Optionally, step 306 may include the following sub-steps S31-S34:
and S31, constructing battery branches by adopting the target battery monomers corresponding to the number of the single-circuit series battery monomers.
In the embodiment of the invention, the number of the single-circuit series battery monomers is equal to the minimum multiple value which is larger than the initial single-circuit battery number in multiple values corresponding to the battery monomer interface number information, and the target battery monomers corresponding to the number of the single-circuit series battery monomers are selected to construct the battery branch.
And S32, selecting H-bridge modules corresponding to the total number of the H-bridge modules.
In the embodiment of the invention, the total number of the H-bridge modules is determined by the comparison result of the first initial number and the second initial number, and the corresponding H-bridge module is selected according to the total number of the H-bridge modules.
And S33, respectively connecting the battery branches to the direct current side of each H-bridge module according to the number of the parallel battery branches, and combining the number of the H-bridge modules to obtain a single cascaded multilevel energy storage converter.
In the embodiment of the invention, a plurality of battery branches are constructed by the target battery monomer according to the number of the single-circuit series battery monomers, the battery branches are respectively connected to the direct current side of each H-bridge module according to the number of the parallel battery branches, and the H-bridge modules with the number corresponding to the number of the single-phase H-bridge modules of the single cascade multilevel energy storage converter are connected, so that the single cascade multilevel energy storage converter is constructed.
And S34, connecting the cascaded multi-level energy storage converters in parallel according to the number of the parallel branches of the cascaded multi-level energy storage converters, and connecting the cascaded multi-level energy storage converters to the corresponding bus of the battery energy storage power station to obtain a main loop of the battery energy storage power station.
In the embodiment of the invention, the constructed energy storage power station cascaded multi-level energy storage converters are connected in parallel according to the parallel number of the cascaded multi-level energy storage converters and are connected into the corresponding bus of the battery energy storage power station, so that a main loop of the battery energy storage power station is constructed, and parameter calculation such as alternating current filter inductance, direct current filter inductance and direct current capacitance in the main loop of the battery energy storage power station and model selection of a power semiconductor device are further perfected based on the power and capacity of an energy storage power station subsystem.
For example: the selected target battery is a lithium iron phosphate battery with 3.2V/280Ah, a 40MW/300MWh battery energy storage power station is designed, the voltage level of an access bus is 10kV, a cascade multilevel converter is in star connection and is composed of a plurality of H-bridge modules, a main loop of the battery energy storage power station is formed by connecting a plurality of cascade multilevel energy storage converters in parallel, and the specific design process of the main loop of the battery energy storage power station is as follows:
step 1, the charging and discharging time of the battery energy storage power station is 300MWh/40 MW-5H, the battery energy storage power station belongs to a target application scene with small charging and discharging current and long time, and the number of parallel battery branches connected in parallel on the direct current side of the H-bridge module is determined to be 2 by combining a preset scene information table.
And 2, adopting a preset power semiconductor device as an IGBT switch device, selecting the IGBT rated voltage as 1700V, and presetting the voltage margin of the power semiconductor device as 1.7-2 and the IGBT voltage margin as 2. The working range of the target battery cell is 2.8-3.6V, the maximum working voltage of the target battery cell is 3.6V, and the number of the initial single-circuit series battery cells is 1700/2/3.6-236.1. The number of battery cell interfaces in a common Battery Management System (BMS) product is generally 8 or 16, a minimum multiple value greater than the initial single-circuit battery number is selected from multiple values corresponding to 8 or 16 corresponding to the battery cell interface number information to be the single-circuit battery number corresponding to the target battery, that is, the single-circuit battery number is designed to be 240, and since the target battery cell capacity is large, the target battery cells are only connected in series and are not connected in parallel, the specific connection relationship is as shown in fig. 4, 1P240S means that the single-circuit series battery cell number is designed to be 240, the number of parallel battery branches is 2, and 215kWh means that the battery capacity is 240 × 3.2V × 280Ah 215kWh, and the battery branches are connected to the direct current side of the H-bridge module.
And 3, calculating the rated module capacity 280Ah 3.2V 240 corresponding to a single H-bridge module to be 430kWh based on the cell rated voltage 3.2V, the cell capacity 280Ah, the number 2 of the parallel cell branches obtained in the step 1 and the number 240 of the single series cell calculated in the step 2 of the target cell, wherein the total energy storage capacity of the designed battery energy storage power station is 300MWh, so that the total number of H-bridge modules at least required by the battery energy storage power station is 300MWh/0.43kWh to 466, namely the total number of the initial H-bridge modules is 466.
Step 4, presetting grid-connected parameters of lambda being 30%, delta being 2%, epsilon being 3%, chi being 15%, M being 98%, alpha being 10%, gamma being 10%, U bat_min ＝2.8V*240＝672V，U sl And substituting the preset grid-connected parameters into a preset single-phase H-bridge module quantity calculation formula of the single cascaded multilevel energy storage converter, wherein N is 30.9, the number N of single-phase submodules of the redundant single cascaded multilevel energy storage power station subsystem is rounded up to 21, the number of redundant modules is 2, and the number of single-phase H-bridge modules is multiplied by three to obtain the number of H-bridge modules required by the single cascaded multilevel energy storage converter, wherein the number of H-bridge modules is 3.
Step 5, carrying out a ratio of the initial total number 466 of the H-bridge modules obtained by calculation in the step 3 to the number 3 x 21 of the H-bridge modules required by the single cascaded multi-level energy storage converter calculated in the step 4, wherein the result is 7.40, carrying out rounding operation on the module ratio, and obtaining the parallel number of the downwards rounded cascaded multi-level energy storage converters, the parallel number of the upwards rounded cascaded multi-level energy storage converters and the corresponding total number of the H-bridge modules by adjusting the number of the H-bridge modules of the single cascaded multi-level energy storage converter, so as to obtain the following two main loop schemes of the battery energy storage power station:
scheme one (rounding up): 8 cascaded multilevel energy storage converters are connected in parallel, each cascaded multilevel energy storage converter is provided with 3X 21H-bridge modules (2 redundancies), and the capacity of a single H-bridge module is 0.43kWh, so that the actual capacity of the whole station exceeds the rated capacity by 8%;
scheme two (rounding down): 7 cascaded multilevel energy storage converters are connected in parallel, each cascaded multilevel energy storage converter is provided with 3X 23H-bridge modules (4 redundancies), the capacity of a single H-bridge module is 0.43kWh, and the actual capacity of the whole station exceeds the rated capacity by 4%.
The battery over-metering amount difference of the two schemes is small, but as the number of H bridge modules in the cascaded multi-level energy storage converter rises, the number of target battery monomers increases sharply, and the data amount to be processed by the cascaded multi-level energy storage converter controller is increased in multiples. Therefore, the first option is that the whole station is connected in parallel with 8 cascaded multi-level energy storage converters, where the number of single series-connected battery cells is 240, the number of parallel battery branches is 2, and the number of H-bridge modules of a single cascaded multi-level energy storage converter is 3 × 21. According to the first scheme, H-bridge modules with the number corresponding to that of the H-bridge modules are used for constructing cascaded multi-level converters, battery branches are connected to the direct current side of each H-bridge module according to the number of the parallel battery branches, single cascaded multi-level energy storage converters are obtained, the capacity of each single cascaded multi-level energy storage converter is 5MW/27.1MWh, each cascaded multi-level energy storage converter is connected in parallel according to the parallel number of the cascaded multi-level energy storage converters, a bus with the voltage level of 10kV is connected in parallel, and a main loop of the battery energy storage power station is obtained, and the main loop is shown in fig. 5.
And 6, calculating the power and the capacity of a single cascaded multi-level energy storage converter according to the step 5, and calculating that the value of the alternating current filter inductance is 10mH, the value of the direct current capacitance is 4.7mF, the value of the direct current filter inductance is 3mH by combining a preset converter design scheme, and the type of the IGBT can be selected from 1700V/600A.
In the embodiment of the invention, when the total capacity of the energy storage power station, the power station power, the preset power semiconductor device voltage information and the number information of the battery monomer interfaces are received, the type of the target battery monomer for constructing the main loop of the battery energy storage power station is selected according to the total capacity of the energy storage power station and the power station power. And calculating the ratio of the total capacity of the energy storage power station to the power of the power station to obtain the discharge time of the battery energy storage power station, and matching the corresponding target application scene from the preset scene information table by using the discharge time as a key word, so that the number of the parallel battery branches corresponding to the target application scene is determined as the number of the parallel battery branches corresponding to the target battery. Calculating the ratio of the rated voltage of the preset power semiconductor device, the voltage margin of the preset power semiconductor device and the maximum working voltage corresponding to the target battery monomer to obtain the number of the initial single-circuit series battery monomers, selecting the minimum multiple value larger than the number of the initial single-circuit series battery monomers from multiple values corresponding to the interface number information of the battery monomers, and selecting the minimum multiple value larger than the number of the initial single-circuit series battery monomers from multiple values corresponding to the interface number information of the battery monomers.
And calculating the battery quantity information, the rated voltage of the single battery and the capacity of the single battery to obtain the rated module capacity corresponding to the single H-bridge module. And calculating the ratio of the total capacity of the energy storage power station corresponding to the energy storage power station capacity demand information to the rated module capacity, and determining the total number of the initial H-bridge modules. The method comprises the steps of substituting preset grid connection parameters into a preset single-phase H-bridge module calculation formula of a single cascaded multi-level energy storage converter, determining the number of H-bridge modules required by the single cascaded multi-level energy storage converter, calculating the ratio of the initial total number of the H-bridge modules to the number of the H-bridge modules required by the single cascaded multi-level energy storage converter to obtain a module ratio, performing rounding operation on the module ratio to obtain the parallel number of the cascaded multi-level energy storage converter which is rounded downwards and the parallel number of the cascaded multi-level energy storage converter which is rounded upwards, calculating the actual total number of the H-bridge modules required by the cascaded multi-level energy storage converter which is rounded downwards to obtain a corresponding first initial number, calculating the actual total number of the H-bridge modules required by the cascaded multi-level energy storage converter which is rounded upwards to obtain a corresponding second initial number. And comparing the first initial number with the second initial number, and determining the total number of the H-bridge modules and the parallel number of the cascaded multi-level energy storage converters based on the comparison result. The method comprises the steps of establishing battery branches by adopting target battery monomers corresponding to the number of the single-circuit series battery monomers, selecting H-bridge modules corresponding to the total number of the H-bridge modules, respectively connecting the battery branches to the direct current side of each H-bridge module according to the number of the parallel battery branches to obtain a cascade multilevel energy storage converter, connecting each cascade multilevel energy storage converter in parallel according to the parallel circuit number of the cascade multilevel energy storage converter, and connecting the cascade multilevel energy storage converter to a bus corresponding to a battery energy storage power station to obtain a main circuit of the battery energy storage power station. The method and the device realize the calculation of the required target cell number, the H-bridge module number, the total H-bridge module number and the parallel connection number of the cascaded multi-level energy storage converters according to the information such as the capacity requirement of the energy storage power station, the grid connection parameters and the like, and meet the technical requirement of the construction of the main circuit of the battery energy storage power station based on the cascaded multi-level topology.
Referring to fig. 6, fig. 6 is a block diagram of a main loop construction system of a battery energy storage power station according to a third embodiment of the present invention.
The embodiment of the invention provides a main loop construction system of a battery energy storage power station, which comprises:
and the target battery selection module 601 is configured to, when the energy storage power station capacity demand information is received, select a type of the target battery cell according to the energy storage power station capacity demand information.
The battery number information determining module 602 is configured to determine battery number information of the target battery cell based on the maximum working voltage corresponding to the target battery cell and the energy storage power station capacity requirement information.
And an initial H-bridge module total number determining module 603, configured to determine the initial H-bridge module total number according to the battery number information, the energy storage power station capacity requirement information, and the battery cell parameter corresponding to the target battery cell.
The H-bridge module number information and cascaded multi-level energy storage converter parallel number determining module 604 is configured to determine, according to preset grid-connected parameters and the initial total number of H-bridge modules, the total number of H-bridge modules, and the number of cascaded multi-level energy storage converters in parallel, which are required by a single cascaded multi-level energy storage converter.
The battery energy storage power station main loop construction module 605 is configured to construct a battery energy storage power station main loop based on a cascaded multilevel topology by using the H-bridge modules corresponding to the total number of the H-bridge modules and the target battery cells corresponding to the battery number information, and combining the parallel number of the cascaded multilevel energy storage converters and the number of the H-bridge modules.
Optionally, the energy storage power station capacity demand information includes total capacity of the energy storage power station, power station power, preset power semiconductor device voltage information, and battery cell interface quantity information. The battery number information determination module 602 includes:
and the discharging time length calculating module is used for calculating the ratio of the total capacity of the energy storage power station to the power station power to obtain the discharging time length of the battery energy storage power station.
And the parallel battery branch number determining module is used for determining the number of parallel battery branches corresponding to the target battery monomer according to the discharge duration.
Further, the parallel battery branch number determination module may further perform the following steps:
matching a corresponding target application scene from a preset scene information table by using the discharge duration as a keyword;
and determining the number of the parallel battery branches corresponding to the target application scene as the number of the parallel battery branches corresponding to the target battery monomer.
And the single-circuit serial battery monomer quantity determining module is used for determining the quantity of the single-circuit serial battery monomers corresponding to the target battery monomer according to the preset voltage information of the power semiconductor device, the maximum working voltage corresponding to the target battery monomer and the battery monomer interface quantity information.
Further, the preset power semiconductor device voltage information comprises a preset power semiconductor device rated voltage and a preset power semiconductor device voltage margin. The single-circuit series battery cell number determination module may further perform the following steps:
calculating the ratio of the rated voltage of the preset power semiconductor device, the voltage margin of the preset power semiconductor device and the maximum working voltage corresponding to the target battery monomer to obtain the number of the initial single-circuit series battery monomers;
selecting a minimum multiple value larger than the number of the initial single-circuit series battery monomers from multiple values corresponding to the number information of the battery monomer interfaces;
and determining the minimum multiple value as the number of the single-circuit series battery monomers corresponding to the target battery monomer.
Optionally, the cell parameters include cell nominal voltage and cell capacity. The initial H-bridge module total number determination module 603 includes:
and the rated module capacity obtaining module is used for calculating the battery quantity information, the battery monomer rated voltage and the battery monomer capacity to obtain the rated module capacity corresponding to the single H-bridge module.
And the initial H-bridge module total number determining submodule is used for calculating the ratio of the total capacity of the energy storage power station corresponding to the energy storage power station capacity demand information to the rated module capacity, and determining the initial H-bridge module total number.
Optionally, the H-bridge module number information and cascaded multi-level energy storage converter parallel number determining module 604 includes:
and the H-bridge module number determining module is used for substituting preset power grid connection parameters into a preset single-phase H-bridge module number calculation formula of a single cascaded multi-level energy storage converter and determining the number of H-bridge modules required by the single cascaded multi-level energy storage converter.
And the module ratio obtaining module is used for calculating the ratio of the total number of the initial H-bridge modules to the number of the H-bridge modules to obtain a module ratio.
And the module is used for executing rounding operation on the module ratio to obtain the parallel number of the downward rounding cascaded multi-level energy storage converters and the parallel number of the upward rounding cascaded multi-level energy storage converters.
And the first initial number calculating module is used for calculating the total number of the actual H-bridge modules required by the parallel number of the lower integer cascade multilevel energy storage converters to obtain the corresponding first initial number.
And the second initial number calculating module is used for calculating the total number of the actual H-bridge modules required by the parallel number of the upper rounding cascade multilevel energy storage converters to obtain a second initial number.
And the first initial quantity and second initial quantity comparison module is used for comparing the first initial quantity and the second initial quantity.
And the first comparison result module is used for taking the second initial quantity as the total number of the H-bridge modules and taking the upwards rounded parallel quantity of the cascaded multi-level energy storage converters as the parallel quantity of the cascaded multi-level energy storage converters if the first initial quantity is greater than the second initial quantity.
And the second comparison result module is used for taking the first initial number as the total number of the H-bridge modules and taking the parallel number of the downward-rounded cascaded multi-level energy storage converters as the parallel number of the cascaded multi-level energy storage converters if the first initial number is smaller than the second initial number.
Optionally, the battery energy storage plant primary loop construction module 605 includes:
and the battery branch building module is used for building battery branches by adopting target battery monomers corresponding to the number of the battery monomers connected in series in a single way.
And the H-bridge module selecting module is used for selecting the H-bridge modules corresponding to the total number of the H-bridge modules.
And the cascade multilevel energy storage converter obtaining modules are used for connecting the battery branches to the direct current side of each H-bridge module according to the number of the parallel battery branches, and obtaining a single cascade multilevel energy storage converter by combining the number of the H-bridge modules.
And the battery energy storage power station main circuit construction submodule is used for connecting the cascaded multi-level energy storage converters in parallel according to the parallel number of the cascaded multi-level energy storage converters and connecting the cascaded multi-level energy storage converters and the corresponding buses of the battery energy storage power station to obtain the battery energy storage power station main circuit.
An embodiment of the present invention further provides an electronic device, where the electronic device includes: the computer system comprises a memory and a processor, wherein a computer program is stored in the memory; the computer program, when executed by the processor, causes the processor to perform the method of constructing a main circuit of a battery energy storage station as in any of the above embodiments.
The memory may be an electronic memory such as a flash memory, an EEPROM (electrically erasable programmable read only memory), an EPROM, a hard disk, or a ROM. The memory has a memory space for program code for performing any of the method steps of the above-described method. For example, the memory space for the program code may comprise respective program codes for implementing the respective steps in the above method, respectively. The program code can be read from or written to one or more computer program products. These computer program products comprise a program code carrier such as a hard disk, a Compact Disc (CD), a memory card or a floppy disk. The program code may be compressed, for example, in a suitable form. The code, when executed by a computing processing device, causes the computing processing device to perform the steps of the battery power station primary loop construction method described above.
The embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the method for constructing a main loop of a battery energy storage power station according to any one of the above embodiments.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, a division of a unit is merely a logical division, and an actual implementation may have another division, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
Units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit may be implemented in the form of hardware, or may also be implemented in the form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (10)

1. A method for constructing a main loop of a battery energy storage power station is characterized by comprising the following steps:
when energy storage power station capacity demand information is received, performing type selection on a target battery monomer according to the energy storage power station capacity demand information;
determining battery quantity information of the target battery monomer based on the maximum working voltage corresponding to the target battery monomer and the capacity demand information of the energy storage power station;
determining the total number of initial H-bridge modules according to the battery quantity information, the energy storage power station capacity demand information and the battery monomer parameters corresponding to the target battery monomer;
determining the number of H-bridge modules, the total number of H-bridge modules and the parallel number of cascaded multi-level energy storage converters required by a single cascaded multi-level energy storage converter according to preset power grid connection parameters and the initial total number of H-bridge modules;
and constructing a battery energy storage power station main loop based on the cascade multilevel topology by adopting the H-bridge modules with the number corresponding to the total number of the H-bridge modules and the target battery monomers with the number corresponding to the battery number information and combining the parallel number of the cascade multilevel energy storage converters and the number of the H-bridge modules.
2. The method for constructing the main loop of the battery energy storage power station as claimed in claim 1, wherein the energy storage power station capacity demand information includes total capacity of the energy storage power station, power station power, preset power semiconductor device voltage information and battery cell interface number information; the step of determining the battery quantity information of the target battery monomer based on the maximum working voltage corresponding to the target battery monomer and the energy storage power station capacity demand information includes:
calculating the ratio of the total capacity of the energy storage power station to the power station power to obtain the discharge time of the battery energy storage power station;
determining the number of parallel battery branches corresponding to the target battery monomer according to the discharge duration;
and determining the number of the single-circuit series battery monomers corresponding to the target battery monomer according to the preset power semiconductor device voltage information, the maximum working voltage corresponding to the target battery monomer and the battery monomer interface number information.
3. The method for constructing the main loop of the battery energy storage power station as claimed in claim 2, wherein the step of determining the number of the parallel battery branches corresponding to the target battery cell according to the discharge duration comprises:
matching a corresponding target application scene from a preset scene information table by using the discharge duration as a keyword;
and determining the number of the parallel battery branches corresponding to the target application scene as the number of the parallel battery branches corresponding to the target battery monomer.
4. The battery energy storage power station primary loop construction method of claim 2, wherein the preset power semiconductor device voltage information includes a preset power semiconductor device rated voltage and a preset power semiconductor device voltage margin; the step of determining the number of the single-circuit series battery monomers corresponding to the target battery monomer according to the preset power semiconductor device voltage information, the maximum working voltage corresponding to the target battery monomer and the battery monomer interface number information includes:
calculating the ratio of the rated voltage of the preset power semiconductor device, the voltage margin of the preset power semiconductor device and the maximum working voltage corresponding to the target battery monomer to obtain the number of the initial single-circuit series battery monomers;
selecting a minimum multiple value larger than the number of the initial single-circuit series battery monomers from multiple values corresponding to the battery monomer interface number information;
and determining the minimum multiple value as the number of the single-circuit series battery monomers corresponding to the target battery monomer.
5. The method for constructing the main loop of the battery energy storage power station according to claim 1, wherein the battery cell parameters comprise a battery cell rated voltage and a battery cell capacity; the step of determining the total number of the initial H-bridge modules according to the battery quantity information, the energy storage power station capacity demand information and the battery monomer parameters corresponding to the target battery monomer comprises the following steps:
calculating the battery quantity information, the rated voltage of the single battery and the capacity of the single battery to obtain the rated module capacity corresponding to the single H-bridge module;
and calculating the ratio of the total capacity of the energy storage power station corresponding to the energy storage power station capacity demand information to the capacity of the rated module, and determining the total number of the initial H-bridge modules.
6. The method for constructing the main circuit of the battery energy storage power station according to claim 1, wherein the step of determining the number of the H-bridge modules, the total number of the H-bridge modules and the parallel number of the cascaded multi-level energy storage converters required by a single cascaded multi-level energy storage converter according to preset grid-connected parameters and the total number of the initial H-bridge modules comprises the following steps:
substituting preset grid-connected parameters into a preset single-phase H-bridge module number calculation formula of a single cascaded multi-level energy storage converter, and determining the number of H-bridge modules required by the single cascaded multi-level energy storage converter;
calculating the ratio of the total number of the initial H-bridge modules to the number of the H-bridge modules to obtain a module ratio;
performing rounding operation on the module ratio to obtain the parallel number of the downward rounding cascade multi-level energy storage converters and the parallel number of the upward rounding cascade multi-level energy storage converters;
calculating the total number of the actual H-bridge modules required by the parallel connection number of the downward rounding cascade multilevel energy storage converters to obtain a corresponding first initial number;
calculating the total number of the actual H-bridge modules required by the parallel connection number of the upward rounding cascade multi-level energy storage converters to obtain a second initial number;
comparing the first initial quantity and the second initial quantity;
if the first initial number is larger than the second initial number, taking the second initial number as the total number of the H-bridge modules, and taking the parallel number of the upward rounding cascade multi-level energy storage converters as the parallel number of the cascade multi-level energy storage converters;
and if the first initial quantity is smaller than the second initial quantity, taking the first initial quantity as the total number of the H-bridge modules, and taking the parallel quantity of the downward-rounded cascaded multi-level energy storage converters as the parallel quantity of the cascaded multi-level energy storage converters.
7. The method for constructing the main loop of the battery energy storage power station as claimed in claim 2, wherein the step of constructing the main loop of the battery energy storage power station based on the cascaded multilevel topology by combining the number of the cascaded multilevel energy storage converters connected in parallel and the number of the H-bridge modules with the number of the H-bridge modules corresponding to the total number of the H-bridge modules and the number of the target battery cells corresponding to the battery number information comprises:
constructing a battery branch by adopting target battery monomers corresponding to the number of the single-path series battery monomers;
selecting H bridge modules corresponding to the total number of the H bridge modules;
respectively connecting the battery branches to the direct current side of each H-bridge module according to the number of the parallel battery branches, and combining the number of the H-bridge modules to obtain a single cascaded multi-level energy storage converter;
and connecting all the cascaded multi-level energy storage converters in parallel according to the parallel quantity of the cascaded multi-level energy storage converters, and connecting the cascaded multi-level energy storage converters into a bus corresponding to the battery energy storage power station to obtain a main loop of the battery energy storage power station.
8. A battery energy storage power station primary circuit construction system is characterized by comprising:
the target battery monomer selection module is used for selecting the type of a target battery monomer according to the capacity demand information of the energy storage power station when the capacity demand information of the energy storage power station is received;
the battery number information determining module is used for determining the battery number information of the target battery monomer based on the maximum working voltage corresponding to the target battery monomer and the capacity demand information of the energy storage power station;
the initial H-bridge module total number determining module is used for determining the initial H-bridge module total number according to the battery number information, the energy storage power station capacity demand information and the battery monomer parameters corresponding to the target battery monomer;
the H-bridge module quantity information and cascaded multi-level energy storage converter parallel quantity determining module is used for determining the quantity of H-bridge modules, the total quantity of H-bridge modules and the cascaded multi-level energy storage converter parallel quantity required by a single cascaded multi-level energy storage converter according to preset power grid connection parameters and the initial H-bridge module total quantity;
and the battery energy storage power station main loop construction module is used for constructing a battery energy storage power station main loop based on the cascade multilevel topology by adopting the H bridge modules with the number corresponding to the total number of the H bridge modules and the target battery monomers with the number corresponding to the battery number information and combining the parallel number of the cascade multilevel energy storage converters and the number of the H bridge modules.
9. An electronic device, comprising a memory and a processor, wherein the memory stores a computer program, and the computer program, when executed by the processor, causes the processor to perform the steps of the battery energy storage station primary loop construction method according to any one of claims 1 to 7.
10. A computer-readable storage medium, on which a computer program is stored, which, when executed, implements the battery energy storage station primary loop construction method according to any of claims 1-7.
CN202210743448.7A 2022-06-28 2022-06-28 Method, system, equipment and medium for constructing main loop of battery energy storage power station Pending CN115065082A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117239811A (en) * 2023-11-14 2023-12-15 中国华能集团清洁能源技术研究院有限公司 Hybrid energy storage system, super capacitor configuration method and coordination control method
CN117277474A (en) * 2023-08-29 2023-12-22 杭州华塑科技股份有限公司 Battery charging distribution method, device, equipment and storage medium

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117277474A (en) * 2023-08-29 2023-12-22 杭州华塑科技股份有限公司 Battery charging distribution method, device, equipment and storage medium
CN117239811A (en) * 2023-11-14 2023-12-15 中国华能集团清洁能源技术研究院有限公司 Hybrid energy storage system, super capacitor configuration method and coordination control method
CN117239811B (en) * 2023-11-14 2024-01-30 中国华能集团清洁能源技术研究院有限公司 Hybrid energy storage system, super capacitor configuration method and coordination control method

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