CN117613323A - Cold shutdown control method, device and equipment for electric pile system and storage medium - Google Patents

Cold shutdown control method, device and equipment for electric pile system and storage medium Download PDF

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Publication number
CN117613323A
CN117613323A CN202311721079.2A CN202311721079A CN117613323A CN 117613323 A CN117613323 A CN 117613323A CN 202311721079 A CN202311721079 A CN 202311721079A CN 117613323 A CN117613323 A CN 117613323A
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China
Prior art keywords
cold
shutdown
pile
sequence
shut down
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CN202311721079.2A
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Inventor
宋浩永
黄青丹
李紫勇
王婷延
黄慧红
王勇
莫文雄
刘智勇
韦凯晴
赵崇智
刘静
魏晓东
李东宇
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Guangzhou Power Supply Bureau of Guangdong Power Grid Co Ltd
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Guangzhou Power Supply Bureau of Guangdong Power Grid Co Ltd
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Priority to CN202311721079.2A priority Critical patent/CN117613323A/en
Publication of CN117613323A publication Critical patent/CN117613323A/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
    • H01M8/04298—Processes for controlling fuel cells or fuel cell systems
    • H01M8/04694—Processes for controlling fuel cells or fuel cell systems characterised by variables to be controlled
    • H01M8/04955—Shut-off or shut-down of fuel cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
    • H01M8/04223—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids during start-up or shut-down; Depolarisation or activation, e.g. purging; Means for short-circuiting defective fuel cells
    • H01M8/04228—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids during start-up or shut-down; Depolarisation or activation, e.g. purging; Means for short-circuiting defective fuel cells during shut-down
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
    • H01M8/04298—Processes for controlling fuel cells or fuel cell systems
    • H01M8/043—Processes for controlling fuel cells or fuel cell systems applied during specific periods
    • H01M8/04303—Processes for controlling fuel cells or fuel cell systems applied during specific periods applied during shut-down
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
    • H01M8/04298—Processes for controlling fuel cells or fuel cell systems
    • H01M8/04313—Processes for controlling fuel cells or fuel cell systems characterised by the detection or assessment of variables; characterised by the detection or assessment of failure or abnormal function
    • H01M8/04537—Electric variables
    • H01M8/04544—Voltage
    • H01M8/04559—Voltage of fuel cell stacks

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)

Abstract

The invention discloses a cold shutdown control method, a cold shutdown control device, cold shutdown control equipment and a storage medium of a pile system, wherein the pile system comprises a first number of piles, and the cold shutdown control method comprises the following steps: determining a second number of stacks that need to be cold shut down; obtaining consistency differences of all electric stacks and obtaining a first cold shutdown sequence; determining a third number according to the cold shutdown times of each pile and the corresponding threshold value in a preset time period, and deleting the pile of the third number to obtain a second cold shutdown sequence; determining a fourth number according to the cold start-stop time interval of each pile and the corresponding threshold value in a preset time period, and deleting the pile of the fourth number to obtain a third cold stop sequence; acquiring interval time of two adjacent cold shut-down steps of each pile, and carrying out cold shut-down on a fifth number of piles according to the interval time and a corresponding threshold value; and if the fifth number is smaller than the second number, cooling and stopping the sixth number of electric stacks according to the working time of each electric stack and the corresponding threshold value. The service life of the galvanic pile is longer, and the galvanic pile has flexibility and reliability in actual scenes.

Description

Cold shutdown control method, device and equipment for electric pile system and storage medium
Technical Field
The present invention relates to the technical field of pile systems, and in particular, to a cold shutdown control method, device, equipment and storage medium for pile systems.
Background
In recent years, with the large-scale grid connection of renewable energy sources, the intermittent power generation of the renewable energy sources, the stability and the safety of a fluctuating power grid have great challenges. In the intermittent and frequent fluctuation application scenario of the pile system matched with renewable energy sources, the pile system can meet various regulation strategies of specific horizontal loads by adjusting the running states of each independently controlled pile in the pile system, wherein cold shutdown regulation is an important regulation strategy.
In an actual application scene, in order to adapt to flexible and changeable scene requirements, a pile system needs to bear frequent start-stop operation, dynamic fluctuation and power adaptation. In the prior art, when the state of the electric pile such as cold start, hot start, cold stop and hot standby is switched, only a single electric pile is usually considered to be controlled. A single control strategy often results in a stack system that lacks flexibility and reliability in the context of intermittent operation, or frequent switching of states, and is prone to adverse effects on stack life. For an entire stack system consisting of several independently controlled stacks, there is a lack of effective cold shutdown control strategies in the prior art.
Disclosure of Invention
The invention aims to provide a cold shutdown control method, a cold shutdown control device, cold shutdown control equipment and a cold shutdown control storage medium for a pile system, which are used for solving the technical problem that the cold shutdown control of the pile system formed by a plurality of independently controlled piles is lacked in the related technology.
The aim of the invention can be achieved by the following technical scheme:
in one aspect, a cold shutdown control method of a pile system, the pile system including a first number of piles, each pile being independently controlled, includes:
determining a second number of the electric stacks needing cold shutdown according to a demand response instruction of the power grid, wherein the demand response instruction at least comprises a cold shutdown instruction;
obtaining the corresponding consistency difference of each pile in the first quantity, and obtaining a first cold shutdown sequence of each pile according to each consistency difference; the consistency difference is used for representing the difference between the actual power generation voltage and the rated voltage of the electric pile;
determining a third number of the electric piles which cannot be subjected to cold shutdown according to the cold shutdown times of each electric pile in the first cold shutdown sequence and the preset cold shutdown times constraint in a preset time period, and deleting the electric piles corresponding to the third number from the first cold shutdown sequence to obtain a second cold shutdown sequence;
Determining a fourth number of the electric stacks which cannot be subjected to cold shutdown according to a cold start-stop time interval of each electric stack in the second cold shutdown sequence and a preset cold start-stop time interval threshold value in a preset time period, and deleting the electric stacks corresponding to the fourth number from the second cold shutdown sequence to obtain a third cold shutdown sequence;
acquiring interval time of two adjacent cold stops of each pile in the third cold stop sequence, determining a fifth number of piles capable of cold stop according to the interval time and a preset interval time threshold, and cold stopping the piles corresponding to the fifth number;
if the fifth number is smaller than the second number, working time of each pile in the third cold shutdown sequence is obtained, a sixth number of piles capable of cold shutdown is determined according to the working time and a preset working time threshold, and cold shutdown is carried out on the piles corresponding to the sixth number; and the sum of the fifth quantity and the sixth quantity is smaller than or equal to the second quantity.
Optionally, the obtaining a first cold shutdown sequence of each pile according to each consistency difference includes:
And arranging the stacks in a descending order according to the consistency differences to obtain a corresponding first cold shutdown sequence.
Optionally, the determining, according to the number of cold shutdown times of each pile in the first cold shutdown sequence in the preset time period and the preset constraint of the number of cold shutdown times, the third number of piles that cannot be cold shutdown includes:
acquiring the cold shutdown times corresponding to each pile in the first cold shutdown sequence within a preset time period;
if the cold shutdown times meet the preset cold shutdown times constraint, the corresponding electric pile cannot be subjected to cold shutdown;
and repeating the previous step until the last cold shutdown times to obtain a third number of the electric stacks which cannot be subjected to cold shutdown.
Optionally, the determining, according to the cold start-stop time interval of each stack in the second cold stop sequence within the preset time period and the preset cold start-stop time interval threshold, the fourth number of stacks that cannot be cold stopped includes:
acquiring a cold start-stop time interval corresponding to each pile in the second cold stop sequence within a preset time period;
if the cold start-stop time interval is smaller than a preset cold start-stop time interval threshold, the corresponding electric pile cannot be subjected to cold stop;
And repeating the previous step until the last cold start and stop time interval to obtain a fourth number of the electric stacks which cannot be subjected to cold stop.
Optionally, the determining the fifth number of the stacks capable of cold shut down according to the interval time and a preset interval time threshold includes:
if the interval time is greater than or equal to a preset interval time threshold, the corresponding electric pile can be subjected to cold shutdown;
and repeating the previous step until the last interval time to obtain a fifth number of the electric stacks capable of performing cold shut down.
Optionally, the determining the sixth number of the stacks capable of cold shut down according to the working time and a preset working time threshold includes:
if the working time is greater than a preset working time threshold, the corresponding electric pile can be subjected to cold shutdown;
and repeating the previous step until the last working time, and obtaining a sixth number of the electric stacks capable of performing cold shut down.
Optionally, the operating time of the stack is greater than half the interval time between two adjacent cold stops of the stack.
In a second aspect, a cold shutdown control device of a pile system, the pile system including a first number of piles, each pile being independently controlled, the cold shutdown control device of the pile system including:
The second number determining module is used for determining the second number of the electric pile needing cold shutdown according to a demand response instruction of the power grid, wherein the demand response instruction at least comprises a cold shutdown instruction;
the first sequence determining module is used for obtaining the consistency difference corresponding to each pile in the first quantity and obtaining a first cold shutdown sequence of each pile according to each consistency difference; the consistency difference is used for representing the difference between the actual power generation voltage and the rated voltage of the electric pile;
the second sequence determining module is used for determining a third number of the electric piles which cannot be subjected to cold shutdown according to the cold shutdown times of each electric pile in the first cold shutdown sequence in a preset time period and a preset cold shutdown time constraint, and deleting the electric pile corresponding to the third number from the first cold shutdown sequence to obtain a second cold shutdown sequence;
a third sequence determining module, configured to determine a fourth number of stacks that cannot be cold shut down according to a cold start-stop time interval of each stack in the second cold shut down sequence within a preset time period and a preset cold start-stop time interval threshold, and delete the stacks corresponding to the fourth number from the second cold shut down sequence to obtain a third cold shut down sequence;
A fifth number determining module, configured to obtain an interval time between two adjacent cold shutdown of each pile in the third cold shutdown sequence, determine, according to the interval time and a preset interval time threshold, a fifth number of piles capable of cold shutdown, and cold shutdown the pile corresponding to the fifth number;
a sixth number determining module, configured to obtain a working time of each stack in the third cold shutdown sequence if the fifth number is smaller than the second number, determine, according to the working time and a preset working time threshold, a sixth number of stacks capable of cold shutdown, and cold shutdown the stacks corresponding to the sixth number; and the sum of the fifth quantity and the sixth quantity is smaller than or equal to the second quantity.
In a third aspect, an electronic device includes: a processor and a memory;
wherein the memory stores a computer program, the processor implementing the steps of the method of one aspect when executing the computer program.
In a fourth aspect, a computer readable storage medium has stored thereon a computer program which, when executed by a processor, performs the steps of the method of the first aspect.
Based on the technical scheme, the invention has the beneficial effects that:
according to the embodiment of the invention, the electric pile with large consistency difference is subjected to cold shutdown preferentially, the consistency of an electric pile system is ensured, and meanwhile, the energy consumption of the electric pile system for maintaining the consistency is reduced by constraining the cold shutdown times, the cold start time interval and the duration time of the conventional working state in a certain time and maximally guaranteeing the high consistency of the electric pile running in the conventional working state when a cold shutdown instruction is executed; the frequent start and stop of a single electric pile are avoided, the attenuation of the electric pile with poor consistency with the electric pile system is reduced to the minimum, and the energy consumption for maintaining consistency of the electric pile system is correspondingly reduced after the electric pile system is put into a normal working state again; because most of the electric piles run under the consistent condition, the running reliability of each electric pile in the electric pile system is ensured, the attenuation is effectively inhibited, and the service life of the electric pile is longer. The cold shutdown control method of the electric pile system fills the technical blank of cold shutdown regulation and control of the electric pile system, and enables the electric pile system to have flexibility and reliability in actual application scenes such as intermittent operation, frequent switching of working states and the like.
Drawings
FIG. 1 is a flow chart of a cold shut down control method embodiment of a galvanic pile system according to the invention;
FIG. 2 is a schematic diagram of the operation and cold start-up/shutdown time axes of the SOFC stack in an embodiment of the cold shutdown control method of the stack system of the present invention;
FIG. 3 is a second flow chart of an embodiment of a cold shut down control method of the electric pile system according to the present invention;
fig. 4 is a schematic structural view of an embodiment of a cold shut down control device of the pile system according to the present invention.
Detailed Description
The embodiment of the invention provides a cold shutdown control method, a cold shutdown control device, cold shutdown control equipment and a cold shutdown control storage medium for a pile system, which are used for solving the technical problem that the cold shutdown control of the pile system formed by a plurality of independently controlled piles is lacked in the related technology.
In order that the invention may be readily understood, a more complete description of the invention will be rendered by reference to the appended drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
A Solid Oxide Fuel Cell (SOFC) stack is a cell assembly formed by stacking a plurality of cell units for converting chemical energy into electrical energy. The SOFC stack system comprises the stack itself and the components and control system matched with the stack itself for managing the operation of the stack. The SOFC electric pile and SOFC electric pile system have wide application in the fields of distributed energy sources, fixed power stations, vehicle power systems, airplanes, space detectors and the like.
The normal operating State of the SOFC refers to either dynamic Operation (Dynamic Operation) or Steady State Operation (Steady-State Operation); wherein dynamic operation refers to a process in which the SOFC stack experiences transient conditions or rapid changes in its operating temperature range, such as load changes, fuel flow changes, etc., the stack must respond rapidly to changing operating conditions to maintain stable cell performance; steady state operation refers to a state in which the SOFC stack is continuously operated with the operating temperature and operating conditions maintained stable, and in which the stack is maintained in a stable electrochemical reaction state with the fuel supply and cell temperature maintained at certain levels. This is an ideal situation when the stack is operated for a long period of time.
In an actual application scene, in order to adapt to flexible and changeable scene demands, an SOFC pile system needs to bear frequent start-stop operation, dynamic fluctuation and power adaptation. Thus, in addition to the normal operating conditions, the SOFC stack is involved in different operating conditions such as cold start, hot start, cold shut down and hot standby during start-up and shut down.
Cold start (Cold start) refers to the process of starting a fully shutdown or Cold state SOFC stack from room or Cold state and reaching operating temperature. In cold start, the stack is first warmed up from room or low temperature to operating temperature, which generally takes a long time. After the stack temperature rises to a certain extent, fuel starts to enter the stack and electrochemical reactions start to produce electrical energy. In cold start, the rate of temperature rise needs to be controlled to avoid thermal stress and thermal expansion problems.
Hot start (Hot start) refers to a process of restarting the SOFC stack from a state in which the operating temperature has been reached; in a hot start, the stack is already at operating temperature, so that the electrochemical reaction can begin immediately, producing electrical energy. This is typically faster than a cold start because no warm-up stack is required.
Cold Shutdown (Cold Shutdown), which refers to the process of cooling the SOFC stack from operating temperature to room temperature or a low temperature state and completely shutting down; in a cold shut down, the stack needs to be cooled down, the electrochemical reaction is stopped, the fuel supply is stopped, and this process can be achieved by controlling the gas flow, etc.
Hot Standby (Hot Standby), which is a state in which the SOFC stack is maintained at an operating temperature, but the power output is temporarily stopped so as to be quickly restarted when needed; in hot standby, the stack is maintained at an operating temperature, but the power output is temporarily stopped, typically by closing a stack-to-outside power switch. In this state, the stack remains hot and can be restarted in a short time.
In general, standby of the stack refers to hot standby.
Referring to fig. 1 to 3, the present invention provides an embodiment of a cold shutdown control method of a pile system, the pile system including a first number of piles, each of the piles being independently controlled, the cold shutdown control method of the pile system including:
s100: determining a second number of the electric stacks needing cold shutdown according to a demand response instruction of the power grid, wherein the demand response instruction at least comprises a cold shutdown instruction;
s200: obtaining the corresponding consistency difference of each pile in the first quantity, and obtaining a first cold shutdown sequence of each pile according to each consistency difference; the consistency difference is used for representing the difference between the actual power generation voltage and the rated voltage of the electric pile;
s300: determining a third number of the electric piles which cannot be subjected to cold shutdown according to the cold shutdown times of each electric pile in the first cold shutdown sequence and the preset cold shutdown times constraint in a preset time period, and deleting the electric piles corresponding to the third number from the first cold shutdown sequence to obtain a second cold shutdown sequence;
s400: determining a fourth number of the electric stacks which cannot be subjected to cold shutdown according to a cold start-stop time interval of each electric stack in the second cold shutdown sequence and a preset cold start-stop time interval threshold value in a preset time period, and deleting the electric stacks corresponding to the fourth number from the second cold shutdown sequence to obtain a third cold shutdown sequence;
S500: acquiring interval time of two adjacent cold stops of each pile in the third cold stop sequence, determining a fifth number of piles capable of cold stop according to the interval time and a preset interval time threshold, and cold stopping the piles corresponding to the fifth number;
s600: if the fifth number is smaller than the second number, determining a sixth number of the electric stacks capable of performing cold shutdown according to the working time of each electric stack in the third cold shutdown sequence and a preset working time threshold value, and performing cold shutdown on the electric stacks corresponding to the sixth number; and the sum of the fifth quantity and the sixth quantity is smaller than or equal to the second quantity.
In one embodiment, the stack system may be a SOFC stack system consisting of a plurality (e.g., a first number) of independently controlled SOFC stacks. In the application scene of intermittent type and frequent fluctuation matched with renewable energy sources, the operation state of each independently controlled SOFC electric pile is adjusted, so that the SOFC electric pile system can meet the regulation and control strategies of specific horizontal loads, and the cold shutdown regulation and control of the SOFC electric pile system is one strategy.
It should be noted that, the cold shutdown control in the embodiment of the present invention refers to switching the SOFC stack in the normal working state (including steady-state operation and dynamic operation) to the cold shutdown state.
The cold shutdown control method of the stack system provided by the embodiment of the invention takes the consistency judgment of constant-voltage power generation of the SOFC stack as an example. In practical application, the system can also be a pile system consisting of RSOC reversible piles, or an SOEC pile system consisting of SOEC piles. The system requirement responded by cold shutdown can be a constant voltage power generation requirement or a requirement for reducing the consumption of surplus power to carry out electrolysis, and the quantity of the routine working SOEC in the electrolysis state can be reduced. The invention can be applied to any type of pile system, and can also respond to various types of system demands, the invention does not limit the types of piles and the types of responding system demands, and all types of piles and the types of responding system demands are within the protection scope of the invention.
The inventor of the application finds that the problem of SOFC stack degradation such as sealing failure and the like can be caused by excessive heat cycle times in long-term research, which is not beneficial to long-term safe and reliable operation of the SOFC stack. On the premise of guaranteeing the service life of the SOFC electric pile, the SOFC electric pile system is subjected to cold shutdown regulation and control, and core constraint conditions to be considered are as follows:
(1) It is necessary to ensure consistency between SOFC stacks operating in conventional operating conditions.
When a plurality of SOFC stacks are connected in parallel to generate power, it is theoretically necessary to ensure that the voltages of the SOFC stacks are the same, but due to the inconsistency in the production and manufacturing of the SOFC stacks, the working environment and the like, inconsistent attenuation of the SOFC stacks during operation is likely to occur. For example, in the case of constant-voltage power generation, the power generation voltage of the SOFC stack fluctuates, and in order to maintain the stability of the power generation voltage of the SOFC stack, it is necessary to raise the temperature of the SOFC stack, and more energy is required for raising the temperature, and the smaller the difference in uniformity of the SOFC stacks in the operating state is, the smaller the energy required for maintaining the uniformity is. Therefore, when the SOFC stack system needs to respond to the load change by the SOFC stack cold shut down mode, the SOFC stack with the largest difference in consistency can be brought into cold shut down.
In particular, the uniformity difference is used to represent the difference between the actual power generation voltage and the rated voltage of a stack (e.g., an SOFC stack). The rated voltage of the SOFC stack can be used as a standard value of the generated voltage, the actual generated voltage of each SOFC stack is used as a measurement value of the generated voltage, and the consistency difference can be used for representing the difference between the measurement value of the generated voltage of the SOFC stack and the standard value of the generated voltage. In general, the larger the difference in uniformity of the SOFC stack, the larger the difference between the generated voltage measurement value and the generated voltage standard value of the SOFC stack. If there is a uniformity difference between the plurality of SOFC stacks (i.e., the absolute value of the uniformity difference data of the plurality of SOFC stacks is greater than 0), the ranking may be performed according to the absolute value of the uniformity difference.
(2) Consider the time interval constraint between cold shut down and cold start of a single SOFC stack. Repeated cold shut down and cold start-up can adversely affect the life of the SOFC stack, and the SOFC stack entering the cold shut down cannot immediately be cold started, and a certain time interval is required between cold shut down and cold start-up.
The minimum time constraint delta T between the completion time of stack cold shutdown and the start time of cold start of the SOFC stack can be obtained Start-stop device For example, a schematic diagram of a time axis for actually operating and performing cold start-up and shut-down of a certain SOFC stack is shown in fig. 2.
Wherein: t is t 1 -t 0 Representing the period of time for which the SOFC stack executes a cold shutdown command. That is, the SOFC stack cannot immediately enter a cold shutdown state after receiving a cold shutdown command, and a certain time is required for performing the cold shutdown operation, which is related to the intrinsic characteristics of the SOFC stack and the operating temperature of the SOFC stack before shutdown.
Wherein t is 2 -t 1 And the cold standby time period of the SOFC electric pile is indicated, namely, the time interval between the Q-th receipt of a cold start instruction and the completion of cold stop of the P-th SOFC electric pile. Assume that the cold shut down is required for a length t 1 -t 0 For 8 hours, t 2 -t 1 Can be 8 hours, namely the time spent t from the start of cold stop to the start of cold start 2 -t 0 For a total of 16 hours.
For example, a SOFC stack at 700℃, with a cooling rate of say 5℃/min, cooling to 200℃ for about 2 hours, and then cooling to room temperature, will take longer due to the presence of insulating wool, where 8 hours is one of the expected cases, and in practice the time interval for cold start and stop will have a preferred range. Preferred embodiments may be 2-4 times the "cooling delta temperature/cool down rate" time as the preferred cold start-stop time interval. If the time interval between cold start and stop is too long, the time that the SOFC stack can operate in one year becomes less, and the utilization efficiency of the SOFC stack is reduced.
It should be noted that the cold start-up and shutdown may include two cases, from cold shutdown to cold start-up, or from cold start-up to cold shutdown, of the SOFC stack.
Wherein t is 3 -t 2 Representing the cold start period of the SOFC stack. Similar to the cold shutdown, the SOFC stack also needs a certain time to complete the cold startup operation after receiving the cold startup instruction, and the time is related to the intrinsic characteristics of the SOFC stack and the working temperature requirement after the SOFC cold startup enters the working state.
Wherein t is 4 -t 3 Indicating the operating period of the SOFC stack. And in the period, the SOFC stack is in a normal working state, namely the SOFC stack is in steady-state operation or dynamic operation, and start-stop and standby operation are not executed.
Wherein t is 4 Indicating that the system expects the SOFC stackP+1 times of receiving cold shutdown instruction, ending the normal working state of the SOFC at the moment, executing cold shutdown operation, and t 5 -t 4 Indicating the period of time that the SOFC stack is expected to perform a cold shutdown.
Wherein t is 6 -t 5 Indicating the period of time that the system expects the SOFC stack to be in cold standby. t is t 7 -t 6 Representing the period of time t during which the system expects the SOFC stack to execute the Q+1st cold start command 7 After the time point, the SOFC stack enters a normal working state.
If just one stack of the system receives a cold shutdown command (e.g., t in FIG. 2) 0 Cold shut down command at time point) and after several hours (i.e., t 2 Time point) has a cold start instruction and no other stacks in the middle enter a cold shutdown state, then at t 0 At the time point, it is necessary to judge t 2 -t 1 And DeltaT Start-stop device Is a size relationship of (a). If t 2 -t 1 Less than DeltaT Start-stop device The SOFC stack cannot be put into a cold shut down state but only into a standby state, i.e., the SOFC stack cannot be cold shut down. The standby temperature of the SOFC stack is confirmed by taking the minimum standby energy consumption as a target according to the length of the next operation response time. In this case, the life of the SOFC stack is a primary premise, and the energy consumption required for maintaining the uniformity is a secondary premise.
Likewise, if the SOFC stack is already at t 3 And t 4 Normal operating state between time points, system pair t 3 If the working demand is predicted, judging the time difference t between the completion of the P+1st cold shutdown predicted by the system and the receipt of the cold start command Q+1st according to the system prediction data 6 -t 5 And DeltaT Start-stop device Of the magnitude relation of (1), if t 6 -t 5 Less than DeltaT Start-stop device The SOFC stack cannot enter a cold shutdown but only a standby state.
(3) Consider the operational duration constraints after a single SOFC stack enters an operational state from a cold shutdown. SOFC stacks after entering an operating state from a cold shut down state in a short period of time also cannot enter a cold shut down immediately when the system needs to respond to demand in a cold shut down manner.
Also taking fig. 2 as an example, the duration of the last time a certain SOFC stack was in a normal operation state, i.e. t, can be obtained 4 -t 3 The normal working time is longer than the non-normal working time (i.e. t 4 -t 3 Is greater than t 3 -t 0 ). Otherwise, cold shutdown is performed in a short time after entering the operating state, which also adversely affects the lifetime of the SOFC stack. At this time, the life of the SOFC stack is a primary premise, and the energy consumption required for maintaining the uniformity is a secondary premise.
(4) Considering the shutdown frequency constraint of the SOFC stack in a certain time. In a certain period of time, the cold shutdown times of the SOFC stack have an upper limit, namely the shutdown times of a single SOFC stack cannot be too high, otherwise, the service life of the SOFC stack is adversely affected.
When the difference between the maximum value and the minimum value of the cold shutdown times of the SOFC electric pile in the SOFC electric pile system is greater than or equal to the preset times (such as 3 times), namely one SOFC electric pile has executed 3 cold shutdown instructions according to the cold shutdown method, namely one SOFC electric pile has executed 3 cold shutdown operations and one SOFC electric pile has not executed supercooling shutdown instructions; or one SOFC stack has been subjected to 4 cold stops according to the cold stop method described above, while one SOFC stack has been subjected to only 1 cold stop; then, when there is a cold shutdown instruction next time, the SOFC stack that has performed the maximum number of cold shutdown is no longer judged, and the SOFC stack cannot enter cold shutdown any more.
Although the SOFC stack that has performed the largest number of cold stops performs cold stop to reduce energy consumption by comparing the consistency differences, if a certain SOFC stack is always in charge of cold stop, cold stop and cold start are repeatedly performed on the SOFC stack, the decay of the SOFC stack must be faster, resulting in a larger consistency difference with other SOFC stacks, and more energy is required to maintain the consistency of the SOFC stack with other SOFC stacks during normal operation when the SOFC stack does not reach the replacement standard.
Although the SOFC stacks have consistency differences, the cold shutdown is intended to reduce the consistency differences during operation, the consistency differences during normal operation of the SOFC stacks during cold shutdown are also considered to be not too large, so that the cold start-up and shutdown tasks of the SOFC stack system are carried on each SOFC stack as much as possible, and the cold start-up and shutdown tasks cannot be carried excessively by one working SOFC stack.
In step S100, a second number of stacks requiring cold shut down is determined according to a demand response command of the power grid, the demand response command including at least a cold shut down command.
In one embodiment, the stack system includes a first number of stacks, each stack being independently controlled, e.g., the SOFC stack system includes a first number (N may be used 1 Indicated) SOFC stacks, the status of each stack can be controlled individually. Acquiring a demand response instruction of the electric power system, wherein the demand response instruction at least comprises a cold shutdown instruction of the electric pile system, and the number of electric piles which need to enter a cold shutdown state can be determined according to the cold shutdown instruction, namely, the second number N is determined 2 . The second number may include two cases: n (N) 2 =1; or 2.ltoreq.N 2 ≤N 1 (N 2 ＞1)。
In step S200, obtaining a consistency difference corresponding to each pile in the first number, and obtaining a first cold shutdown sequence of each pile according to each consistency difference; the consistency difference is used to represent the difference between the actual power generation voltage of the stack and the rated voltage.
In one embodiment, the rated voltage of the SOFC stack may be used as a standard value of the generated voltage, the actual generated voltage of each SOFC stack is used as a measured value of the generated voltage, and the consistency difference= |measured value of the generated voltage-standard value of the generated voltage|. The difference between the generated voltage measurement value and the generated voltage standard value of the SOFC stack can be represented by the uniformity difference, and the larger the uniformity difference is, the larger the difference between the generated voltage measurement value and the generated voltage standard value of the SOFC stack is represented.
In one embodiment, deriving a first cold shut down sequence for each stack based on each consistency difference comprises:
and (3) arranging the stacks in descending order according to the consistency differences to obtain a corresponding first cold shutdown sequence.
Specifically, the consistency difference data of each SOFC stack in the operating state in the SOFC stack system is obtained, and it is assumed that all SOFC stacks (co-N 1 And all are in working state to obtain N 1 Corresponding consistency difference data (minimum value can be 0), corresponding to the consistency difference data, N 1 And sequencing the SOFC stacks to obtain a first cold shutdown sequence.
In a preferred embodiment, the SOFC stacks are arranged in descending order according to the absolute value of the consistency difference data, and the serial numbers of the SOFC stacks after the arrangement are respectively defined as 1,2,3 …, i, … and N 1 ，(1≤i≤N 1 I and N 1 All positive integers), the ordered SOFC stacks are input into a reserved cold shutdown sequence of the control system, namely, SOFC stacks obtained by descending the SOFC stacks according to consistency difference data are used as a first cold shutdown sequence.
Since the first number N is shared in the pile system 1 Each pile has corresponding consistency difference data, and if the actual power generation voltage of a pile is equal to the rated voltage, the consistency difference data of the pile is 0; the first cold shutdown sequence obtained by descending order of SOFC stacks according to the consistency difference data also comprises N 1 The number of the electric stacks is 1,2,3 …, i, … and N respectively 1 。
In step S300, according to the number of cold shutdown times and the constraint of the preset number of cold shutdown times of each stack in the first cold shutdown sequence in the preset time period, determining a third number of stacks which cannot be subjected to cold shutdown, and deleting the stacks corresponding to the third number from the first cold shutdown sequence to obtain a second cold shutdown sequence.
In one embodiment, determining the third number of stacks that are not cold shut down based on the number of cold shut down times for each stack in the first cold shut down sequence and the preset cold shut down number constraint for the preset time period includes:
Acquiring the corresponding cold shutdown times of each electric pile in a first cold shutdown sequence within a preset time period;
if the cold shutdown times meet the preset cold shutdown times constraint, the corresponding electric pile cannot be subjected to cold shutdown;
and repeating the previous step until the last cold shutdown times to obtain a third number of electric stacks which cannot be subjected to cold shutdown.
Specifically, for the second number N 2 In the case of 1, only 1 SOFC stack needs to be put into cold shutdown. Sequentially acquiring a certain time period delta T Label (C) Number of cold shut down times K of each SOFC stack in the first cold shut down sequence i The maximum value of the shutdown times of the electric pile in the electric pile system can be recorded as K max The minimum value of the shutdown times of the electric pile in the electric pile system can be recorded as K min If K i -K min Not less than 3, indicating that the shutdown times of the ith pile is K max The SOFC stack can not be cold shut down any more, and the shutdown times are K max Removing a preset shutdown sequence from the SOFC stack, namely, stopping the stack for K times max And deleting the SOFC stack from the first cold shutdown sequence to finally obtain a second cold shutdown sequence.
It should be noted that k can be set when the limit of the cold shut down times in a certain time range is set i -k min And 3 is a constraint condition of the cold shutdown times, and in fact, the numerical value in the constraint can be customized and can be determined according to shutdown times distribution of the pile system. For example, the mathematical distribution of the cold shutdown times of the electric pile in a certain time of the SOFC electric pile system can be obtained, 5% -10% of the data with the largest difference from the average value are removed, and the minimum difference (as an integer) between the removed data can be determined as a new time difference constraint condition, namely k i -k min And (5) not less than the minimum difference value.
In step S400, according to the cold start-stop time interval of each stack in the second cold stop sequence within the preset time period and the preset cold start-stop time interval threshold, determining a fourth number of stacks which cannot be cold stopped, and deleting stacks corresponding to the fourth number from the second cold stop sequence to obtain a third cold stop sequence.
In one embodiment, determining the fourth number of stacks that are not cold shut down based on the cold start-stop time interval for each stack in the second cold shut down sequence for the preset time period and the preset cold start-stop time interval threshold comprises:
acquiring a cold start-stop time interval corresponding to each electric pile in a second cold stop sequence within a preset time period;
if the cold start-stop time interval is smaller than a preset cold start-stop time interval threshold, the corresponding electric pile cannot be subjected to cold stop;
and repeating the previous step until the last cold start-stop time interval to obtain a fourth number of electric stacks which cannot be subjected to cold stop.
Specifically, the cold start-stop time interval of each stack in the second cold stop sequence in the preset time period is sequentially obtained, and the minimum time constraint deltat between the cold stop completion time and the cold start time of the SOFC stacks (such as the stack 1, the stack 2 and the like) corresponding to the number is obtained Start-stop device ，ΔT Start-stop device Is a preset cold start-stop time interval threshold.
In one embodiment, the ith SOFC stack t is obtained by entering the shutdown state after executing the cold shutdown strategy and then executing the cold start strategy in order (i.e., before cold shutdown, after cold start, and referring to the time axis of FIG. 2) 2 -t 1 The value of (1), i.e. cold start-stop time interval t 2 -t 1 ＝ΔT i start-stop (Cold shut down before, cold start after, deltaT) i start-stop Positive), Δt i start-stop Indicating the cold start-stop time interval of the ith stack; if DeltaT i start-stop ＜ΔT Start-stop device And if the cold start-up time interval of the ith electric pile does not meet the constraint of the cold stop time interval, eliminating the ith SOFC electric pile from the second cold stop sequence. After the cycle is completed, a fourth number of stacks that cannot be cold shut down can be obtained. And deleting the electric stacks corresponding to the fourth number from the second cold shutdown sequence to obtain a third cold shutdown sequence (candidate cold shutdown sequence).
In the embodiment of the invention, the shutdown times K are removed from the first cold shutdown sequence i Electric pile which does not meet the constraint of cold shutdown times is obtainedA second cold shut down sequence; removing cold start time interval delta T from second cold shut down sequence i start-stop And after the electric pile which does not meet the constraint of the cold shutdown time interval, obtaining a to-be-selected shutdown sequence to obtain a third cold shutdown sequence.
It should be noted that the process of generating the third cold shut down sequence is the same in the embodiment of the present invention regardless of whether the second number is equal to 1 or greater than 1.
In step S500, the interval time between two adjacent cold stops of each pile in the third cold stop sequence is obtained, the fifth number of piles capable of performing cold stop is determined according to the interval time and a preset interval time threshold, and the piles corresponding to the fifth number are subjected to cold stop.
In one embodiment, determining a fifth number of stacks capable of cold shut down based on the interval time and a preset interval time threshold comprises:
if the interval time is greater than or equal to a preset interval time threshold, the corresponding electric pile can be subjected to cold shutdown;
the previous step is repeated until the last interval time, and a fifth number of stacks capable of cold shut down is obtained.
For the case that only one SOFC stack needs to be subjected to cold shutdown, acquiring a standard time interval value between two adjacent cold shutdown of each stack in a third cold shutdown sequence, namely a standard time interval value delta T between the P+1st cold shutdown and the P cold shutdown Stop and stop T is known to be 4 -t 0 ＝ΔT Stop and stop 。
Specifically, SOFC stack t numbered 1 (i.e. with largest consistency difference) in the selected shutdown sequence is obtained 4 -t 0 The value DeltaT of (1) 1 : if DeltaT 1 ≥ΔT Stop and stop The SOFC stack with the number of 1 enters a cold shutdown state; if DeltaT 1 ＜ΔT Stop and stop If the shutdown command is executed, the time interval between the execution of the shutdown command and the previous execution of the shutdown command is too short, and if the SOFC stack 1 has the largest consistency difference, the consistency difference is continuously expanded, so that the SOFC stack system needs to be consumed when the SOFC stack is in the normal working state againMore energy is used to maintain the uniformity of the SOFC stack system and also detract from the life of the SOFC stack No. 1. Therefore, the No. 1 cell stack cannot enter the cold shutdown at this time, and the SOFC cell stack t numbered 2 in the shutdown sequence to be selected is continuously obtained 4 -t 0 The value DeltaT of (1) 2 If DeltaT 2 ≥ΔT Stop and stop If not, continuously judging whether the No. 3 SOFC stack meets delta T or not 3 ≥ΔT Stop and stop The method comprises the steps of carrying out a first treatment on the surface of the And the like until all the stacks in the shutdown sequence to be selected are judged. When the ith SOFC stack t in the shutdown sequence to be selected 4 -t 0 The value DeltaT of (1) i If DeltaT i ≥ΔT Stop and stop Cold shut down is carried out; if DeltaT i ＜ΔT Stop and stop Then continue to obtain the (i+1) th SOFC stack t 4 -t 0 The value DeltaT of (1) i+1 The method comprises the steps of carrying out a first treatment on the surface of the If DeltaT i+1 ≥ΔT Stop and stop The SOFC stack numbered i+1 enters a cold shut down.
For the case that only one SOFC stack needs to be cold shut down, if N in the shutdown sequence to be selected is reached 2 After all SOFC stacks are judged, delta T is not met i ≥ΔT Stop and stop Under the condition that the fifth quantity is equal to 0, starting from i=1 again, each SOFC stack t in the alternative shutdown sequence is sequentially acquired 4 -t 3 The value DeltaT of (1) I worker (still in order of entering into the shutdown state after executing the cold shutdown strategy and then executing the cold start strategy, i.e. cold shutdown is preceded and cold start is followed, deltaT) I worker Positive), it is known that Δt i -ΔT I worker The value of (2) is t, the duration of the SOFC stack in the non-normal operation state 3 -t 0 If DeltaT I worker ＞ΔT i -ΔT I worker (i.e. t 4 -t 3 ＞t 3 -t 0 ) The conventional working time of the SOFC electric pile is longer than the unconventional working time, and the SOFC electric pile enters a cold stop; if the SOFC stack does not meet delta T I worker ＞ΔT i -ΔT I worker (i.e. the SOFC stack t) 4 -t 3 ≤t 3 -t 0 ) Judging whether the (i+1) th SOFC stack in the shutdown sequence is satisfied in sequence, and cooling the stack satisfying the conditionAnd (5) stopping.
If Δt is satisfied I worker ＞ΔT i -ΔT I worker I.e.At DeltaT I worker The corresponding SOFC stack enters a cold stop, delta T i An interval time (t) between two adjacent cold stops of the stack numbered i 4 -t 0 ) That is to say if the operating time of the stack should be greater than half the time between adjacent cold stops of the stack. It can be understood that the interval time t between two adjacent cold stops of a certain pile 4 -t 0 Can be divided into t 4 -t 3 (normal operating state) and t 3 -t 0 (non-normal operation state) the time for which the stack is in the normal operation state should be longer than the time for which the stack is in the non-normal operation state.
For the case that only one SOFC stack needs to be cold shut down, if N in the shutdown sequence to be selected is reached 1 No stack meets delta T after all the stacks are judged I worker ＞ΔT i -ΔT I worker Conditions (i.e. stacks in all cold shut down sequences to be selected at this time, t) 4 -t 3 ≤t 3 -t 0 The working time is not longer than the non-working time), namely, no SOFC stack can enter a cold shutdown state, and the SOFC stack system does not execute a cold shutdown instruction at this time, and executes a standby instruction instead, so as to meet the system requirements. In a preferred embodiment, the SOFC stack with the largest difference in consistency may be preferentially selected to enter a hot standby state.
The above discussion is how to determine a stack entering a cold shut down for the case where only one stack needs to be cold shut down after the third cold shut down sequence is obtained; the following discusses the case where a plurality of stacks need cold shut down, i.e. a second number N 2 Case > 1:
acquiring number N of SOFC stacks requiring cold shut down related to response requirements 2 If N 2 Not less than 2, method for forming cold shut down sequence to be selected (namely third cold shut down sequence) and N 2 When=1, it is identical and distinguishes the mainThe difference is how to determine the pile entering the cold shutdown in the cold shutdown sequence to be selected, wherein the following steps are adopted:
obtaining SOFC stack t numbered 1 (i.e. with largest consistency difference) in the selected shutdown sequence 4 -t 0 The value DeltaT of (1) 1 : if DeltaT 1 ≥ΔT Stop and stop The SOFC stack with the number of 1 enters a cold shutdown state; obtaining SOFC stack t numbered 2 (i.e. second largest consistency difference) in the shutdown sequence to be selected 4 -t 0 The value DeltaT of (1) 2 : if DeltaT 2 ≥ΔT Stop and stop The SOFC stack with the number of 2 enters a cold shutdown state; if the SOFC stack with the number of 1 or 2 does not meet the condition, judging whether the SOFC stack with the number of i in the shutdown sequence to be selected meets the condition in sequence, namely: if DeltaT i ≥ΔT Stop and stop The stack numbered i enters a cold shutdown, and so on until the number of SOFC stacks entering the cold shutdown is already the second number N 2 That is, the complete selection of all stacks of the SOFC stack system, which need to execute the cold shutdown instruction, can determine N 2 And the electric pile enters a cold stop.
If all SOFC stacks in the to-be-selected shutdown sequence are judged completely, the SOFC stacks are less than N 2 Are in accordance with DeltaT i ≥ΔT Stop and stop Under the condition, starting from i=1 again, sequentially acquiring each SOFC stack t in the alternative shutdown sequence 4 -t 3 The value DeltaT of (1) I worker It can be seen that DeltaT i -ΔT I worker The value of (2) is t, the duration of the SOFC stack in the non-normal operation state 3 -t 0 If DeltaT I worker ＞ΔT i -ΔT I worker (i.e. t 4 -t 3 ＞t 3 -t 0 ) The conventional working time of the SOFC electric pile is longer than the unconventional working time, and the SOFC electric pile enters a cold stop; if the SOFC stack does not meet delta T I worker ＞ΔT i -ΔT I worker (i.e. the SOFC stack t) 4 -t 3 ≤t 3 -t 0 ) And judging whether the (i+1) th SOFC stack in the shutdown sequence is satisfied in sequence, and enabling the SOFC stack meeting the condition to enter a cold shutdown state.
If all SOFC stacks in the shutdown sequence to be selected are allAfter the judgment, all are less than N 2 And enabling the SOFC stacks to enter cold shutdown, and if the quantity of SOFC which enter the cold shutdown under the condition is J, executing a cold shutdown strategy by the J SOFC stacks at the moment, and enabling the N-J SOFC stacks to execute a hot standby strategy to enter a hot standby state so as to respond to the system requirement. Here, the SOFC stack in the hot standby state is preferably the SOFC stack having the largest difference in uniformity.
It will be appreciated that regardless of the second number N 2 =1 or N 2 In the case of > 1, the number of stacks entering a cold shutdown in the final stack system is either equal to N 2 Or is less than N 2 That is, the number of stacks in the stack system that eventually enter a cold shut down is less than or equal to the second number, i.e., the sum of the fifth number and the sixth number is less than or equal to the second number.
According to the cold shutdown control method of the electric pile system, the electric pile with large consistency difference is preferentially shut down, the consistency of the electric pile system is guaranteed, and meanwhile, the energy consumption of the electric pile system for maintaining consistency is reduced by limiting the cold shutdown times, limiting the cold start time interval and limiting the duration of the conventional working state in a certain time, and guaranteeing the high consistency of the electric pile running in the conventional working state to the greatest extent when a cold shutdown instruction is executed; the frequent start and stop of a single electric pile are avoided, the attenuation of the electric pile with poor consistency with the electric pile system is reduced to the minimum, and the energy consumption for maintaining consistency of the electric pile system is correspondingly reduced after the electric pile system is put into a normal working state again; because most of the electric piles run under the consistent condition, the running reliability of each electric pile in the electric pile system is ensured, the attenuation is effectively inhibited, and the service life of the electric pile is longer. The cold shutdown control method of the electric pile system fills the technical blank of cold shutdown regulation and control of the electric pile system, and enables the electric pile system to have flexibility and reliability in actual application scenes such as intermittent operation, frequent switching of working states and the like.
According to the embodiment of the invention, the SOFC electric pile with large consistency difference is subjected to cold shutdown preferentially, the SOFC electric pile system consistency is ensured, the frequent start and stop of a single SOFC electric pile are avoided through the constraint of the shutdown times in a certain time, the constraint of the cold start and stop time interval and the constraint of the duration of the normal working state, and the attenuation of the SOFC electric pile with poor consistency with the SOFC electric pile system is reduced to the minimum, so that the energy consumption for maintaining the consistency of the SOFC electric pile system is correspondingly reduced after the SOFC electric pile system is put into the normal working state again, and the SOFC electric pile has longer service life.
According to the cold shutdown control method of the electric pile system, provided by the embodiment of the invention, through setting the constraint strategy, when a cold shutdown instruction is executed, the high consistency of the existing SOFC electric pile running in a conventional working state is ensured to the greatest extent, and the energy consumption of the SOFC electric pile system for maintaining consistency is reduced; because most SOFC electric piles run under the consistent condition, the running reliability of each electric pile in the SOFC electric pile system is ensured, attenuation is effectively inhibited, and the SOFC electric pile has longer service life. The embodiment of the invention fills the technical blank of cold shutdown regulation and control of the SOFC pile system, so that the SOFC pile system has flexibility and reliability in the intermittent operation scene and the scene of frequent switching of the working state.
Referring to fig. 4, the present invention also provides an embodiment of a cold shut down control apparatus of a pile system including a first number of piles, each of which is independently controlled, the cold shut down control apparatus of the pile system including:
a second number determining module 11, configured to determine a second number of the stacks that need to be cold shut down according to a demand response instruction of the power grid, where the demand response instruction at least includes a cold shut down instruction;
a first sequence determining module 22, configured to obtain a consistency difference corresponding to each pile in the first number, and obtain a first cold shutdown sequence of each pile according to each consistency difference; the consistency difference is used for representing the difference between the actual power generation voltage and the rated voltage of the electric pile;
a second sequence determining module 33, configured to determine a third number of stacks that cannot be cold shut down according to a cold shut down number of each stack in the first cold shut down sequence in a preset time period and a preset cold shut down number constraint, and delete the stacks corresponding to the third number from the first cold shut down sequence to obtain a second cold shut down sequence;
a third sequence determining module 44, configured to determine a fourth number of the electric stacks that cannot be cold shut down according to a cold start-up time interval and a preset cold start-up time interval threshold value of each electric stack in the second cold shut down sequence within a preset time period, and delete the electric stacks corresponding to the fourth number from the second cold shut down sequence to obtain a third cold shut down sequence;
A fifth number determining module 55, configured to obtain an interval time between two adjacent cold shutdown of each stack in the third cold shutdown sequence, determine, according to the interval time and a preset interval time threshold, a fifth number of stacks capable of cold shutdown, and cold shutdown the stack corresponding to the fifth number;
a sixth number determining module 66, configured to determine, if the fifth number is smaller than the second number, a sixth number of stacks capable of performing cold shutdown according to the operating time of each stack in the third cold shutdown sequence and a preset operating time threshold, and cold shutdown the stacks corresponding to the sixth number; and the sum of the fifth quantity and the sixth quantity is smaller than or equal to the second quantity.
According to the cold shutdown control device of the electric pile system, the electric pile with large consistency difference is preferentially shut down, the consistency of the electric pile system is guaranteed, and meanwhile, the energy consumption of the electric pile system for maintaining the consistency is reduced by limiting the cold shutdown times, limiting the cold start time interval and limiting the duration of the conventional working state in a certain time, and guaranteeing the high consistency of the electric pile running in the conventional working state to the greatest extent when a cold shutdown instruction is executed; the frequent start and stop of a single electric pile are avoided, the attenuation of the electric pile with poor consistency with the electric pile system is reduced to the minimum, and the energy consumption for maintaining consistency of the electric pile system is correspondingly reduced after the electric pile system is put into a normal working state again; because most of the electric piles run under the consistent condition, the running reliability of each electric pile in the electric pile system is ensured, the attenuation is effectively inhibited, and the service life of the electric pile is longer. The cold shutdown control method of the electric pile system fills the technical blank of cold shutdown regulation and control of the electric pile system, and enables the electric pile system to have flexibility and reliability in actual application scenes such as intermittent operation, frequent switching of working states and the like.
In addition, the invention also provides electronic equipment, which comprises: a processor and a memory;
wherein the memory stores a computer program which when executed by the processor implements the steps of the method as described.
The invention also provides a computer readable storage medium having stored thereon a computer program which when executed by a processor implements the steps of the method.
It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, which are not repeated herein.
In the 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 apparatus embodiments described above are merely illustrative, e.g., the division of elements is merely a logical functional division, and there may be additional divisions of actual implementation, e.g., multiple elements or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed over a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in essence or a part contributing to the prior art or all or part of the technical solution in the form of a software product stored in a storage medium, including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods of 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, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the 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 scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. A cold shut down control method of a pile system, the pile system comprising a first number of piles, each pile being independently controlled, the cold shut down control method of the pile system comprising:
determining a second number of the electric stacks needing cold shutdown according to a demand response instruction of the power grid, wherein the demand response instruction at least comprises a cold shutdown instruction;
obtaining the corresponding consistency difference of each pile in the first quantity, and obtaining a first cold shutdown sequence of each pile according to each consistency difference; the consistency difference is used for representing the difference between the actual power generation voltage and the rated voltage of the electric pile;
Determining a third number of the electric piles which cannot be subjected to cold shutdown according to the cold shutdown times of each electric pile in the first cold shutdown sequence and the preset cold shutdown times constraint in a preset time period, and deleting the electric piles corresponding to the third number from the first cold shutdown sequence to obtain a second cold shutdown sequence;
determining a fourth number of the electric stacks which cannot be subjected to cold shutdown according to a cold start-stop time interval of each electric stack in the second cold shutdown sequence and a preset cold start-stop time interval threshold value in a preset time period, and deleting the electric stacks corresponding to the fourth number from the second cold shutdown sequence to obtain a third cold shutdown sequence;
acquiring interval time of two adjacent cold stops of each pile in the third cold stop sequence, determining a fifth number of piles capable of cold stop according to the interval time and a preset interval time threshold, and cold stopping the piles corresponding to the fifth number;
if the fifth number is smaller than the second number, determining a sixth number of the electric stacks capable of performing cold shutdown according to the working time of each electric stack in the third cold shutdown sequence and a preset working time threshold value, and performing cold shutdown on the electric stacks corresponding to the sixth number; and the sum of the fifth quantity and the sixth quantity is smaller than or equal to the second quantity.
2. The cold shut down control method of a stack system according to claim 1, wherein said deriving a first cold shut down sequence for each of said stacks based on each of said consistency differences comprises:
and arranging the stacks in a descending order according to the consistency differences to obtain a corresponding first cold shutdown sequence.
3. The method for controlling cold shut down of a stack system according to claim 1, wherein determining the third number of stacks that cannot be cold shut down according to the number of cold shut down times of each stack in the first cold shut down sequence and a preset cold shut down time constraint in a preset time period comprises:
acquiring the cold shutdown times corresponding to each pile in the first cold shutdown sequence within a preset time period;
if the cold shutdown times meet the preset cold shutdown times constraint, the corresponding electric pile cannot be subjected to cold shutdown;
and repeating the previous step until the last cold shutdown times to obtain a third number of the electric stacks which cannot be subjected to cold shutdown.
4. The method for controlling cold shut down of a stack system according to claim 1, wherein determining the fourth number of stacks that cannot be cold shut down according to the cold start-up time interval and the preset cold start-up time interval threshold of each stack in the second cold shut down sequence within the preset time period comprises:
Acquiring a cold start-stop time interval corresponding to each pile in the second cold stop sequence within a preset time period;
if the cold start-stop time interval is smaller than a preset cold start-stop time interval threshold, the corresponding electric pile cannot be subjected to cold stop;
and repeating the previous step until the last cold start and stop time interval to obtain a fourth number of the electric stacks which cannot be subjected to cold stop.
5. The cold shut down control method of a galvanic pile system according to claim 1, wherein the determining the fifth number of galvanic piles capable of cold shut down according to the interval time and a preset interval time threshold value comprises:
if the interval time is greater than or equal to a preset interval time threshold, the corresponding electric pile can be subjected to cold shutdown;
and repeating the previous step until the last interval time to obtain a fifth number of the electric stacks capable of performing cold shut down.
6. The cold shut down control method of a galvanic pile system according to claim 1, wherein the determining the sixth number of galvanic piles capable of cold shut down according to the operating time and a preset operating time threshold value comprises:
If the working time is greater than a preset working time threshold, the corresponding electric pile can be subjected to cold shutdown;
and repeating the previous step until the last working time, and obtaining a sixth number of the electric stacks capable of performing cold shut down.
7. The cold shut down control method of a galvanic pile system according to claim 6, wherein the operating time of the galvanic pile is greater than half of an interval time between adjacent cold shut down of the galvanic pile.
8. A cold shut down control device for a pile system, said pile system comprising a first number of piles, each of said piles being independently controlled, said cold shut down control device comprising:
the second number determining module is used for determining the second number of the electric pile needing cold shutdown according to a demand response instruction of the power grid, wherein the demand response instruction at least comprises a cold shutdown instruction;
the first sequence determining module is used for obtaining the consistency difference corresponding to each pile in the first quantity and obtaining a first cold shutdown sequence of each pile according to each consistency difference; the consistency difference is used for representing the difference between the actual power generation voltage and the rated voltage of the electric pile;
The second sequence determining module is used for determining a third number of the electric piles which cannot be subjected to cold shutdown according to the cold shutdown times of each electric pile in the first cold shutdown sequence in a preset time period and a preset cold shutdown time constraint, and deleting the electric pile corresponding to the third number from the first cold shutdown sequence to obtain a second cold shutdown sequence;
a third sequence determining module, configured to determine a fourth number of stacks that cannot be cold shut down according to a cold start-stop time interval of each stack in the second cold shut down sequence within a preset time period and a preset cold start-stop time interval threshold, and delete the stacks corresponding to the fourth number from the second cold shut down sequence to obtain a third cold shut down sequence;
a fifth number determining module, configured to obtain an interval time between two adjacent cold shutdown of each pile in the third cold shutdown sequence, determine, according to the interval time and a preset interval time threshold, a fifth number of piles capable of cold shutdown, and cold shutdown the pile corresponding to the fifth number;
a sixth number determining module, configured to determine, if the fifth number is smaller than the second number, a sixth number of stacks capable of performing cold shutdown according to a working time of each stack in the third cold shutdown sequence and a preset working time threshold, and cold shutdown the stacks corresponding to the sixth number; and the sum of the fifth quantity and the sixth quantity is smaller than or equal to the second quantity.
9. An electronic device, comprising: a processor and a memory;
wherein the memory stores a computer program, which when executed by the processor implements the steps of the method according to any one of claims 1 to 7.
10. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method of any of claims 1 to 7.
CN202311721079.2A 2023-12-13 2023-12-13 Cold shutdown control method, device and equipment for electric pile system and storage medium Pending CN117613323A (en)

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CN202311721079.2A CN117613323A (en) 2023-12-13 2023-12-13 Cold shutdown control method, device and equipment for electric pile system and storage medium

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CN202311721079.2A CN117613323A (en) 2023-12-13 2023-12-13 Cold shutdown control method, device and equipment for electric pile system and storage medium

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CN117613323A true CN117613323A (en) 2024-02-27

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