CN114784341A - Method, device and equipment for determining closed loop response time length of air flow of hydrogen combustion battery - Google Patents
Method, device and equipment for determining closed loop response time length of air flow of hydrogen combustion battery Download PDFInfo
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Abstract
The invention provides a method, a device and equipment for determining the closed-loop response time length of air flow of a hydrogen fuel cell, wherein the method comprises the following steps: the initial inflection point and the end inflection point of the target stack inlet flow of the air at the power-up stage of the hydrogen fuel cell can be accurately determined by utilizing an inflection point detection function to perform data analysis, so that the initial response time (sampling time corresponding to the initial flow) of the actual stack inlet flow of the air for power step load-drawing and the end response time (sampling time corresponding to the end flow) of the actual stack inlet flow of the air for power step load-drawing can be accurately determined, and the air flow closed-loop response time of the hydrogen fuel cell can be accurately determined; and then the work of the type selection, the electric pile parameter matching, the optimization of the control algorithm and the like of the hydrogen fuel cell auxiliary system can be guided according to the closed-loop response time length, so that the performance of the hydrogen fuel cell can be effectively improved.
Description
Technical Field
The invention belongs to the technical field of hydrogen fuel cells, and particularly relates to a method, a device and equipment for determining closed-loop response time of air flow of a hydrogen fuel cell.
Background
In the process of operating a hydrogen fuel cell (which may be referred to as a hydrogen fuel cell for short), the pem hydrogen fuel cell has high requirements on reaction temperature, pressure, humidity and rotation speed, such as: pressure regulation of a hydrogen spraying valve of the hydrogen treatment system and rotation speed control of a hydrogen circulating pump; controlling the air flow of the air treatment system, controlling the rotating speed of the air compressor and controlling the opening of the back pressure valve; and the temperature control of galvanic pile cooling, the rotating speed control of a fan, the temperature control of intercooler cooling, the rotating speed control of a water pump and the like in the thermal management system.
The parameters such as temperature, pressure, opening degree, rotating speed and flow are key elements for controlling the hydrogen fuel cell, the parameters directly influence the efficiency and stability of the electrical performance output by the fuel cell, and the faster the control response of the parameters is, the earlier the parameters reach a stable state, and the better the improvement of various performance indexes of the hydrogen fuel cell is.
Therefore, for closed-loop control of air flow, the closed-loop response time of the air circuit flow of the hydrogen fuel system is an important index for evaluating the performance of the hydrogen fuel cell system. However, in the related art, no effective method is available at present for accurately determining the closed-loop response time of the air loop flow, so that the effective improvement of the performance index of the hydrogen fuel cell is influenced.
Disclosure of Invention
Aiming at the problems in the prior art, the embodiment of the invention provides a method, a device and equipment for determining the closed-loop response time of the air flow of a hydrogen fuel cell, which are used for solving the technical problem that the closed-loop response time of the air flow of a hydrogen fuel system cannot be determined in the prior art, so that the performance index of the hydrogen fuel cell is effectively improved.
In a first aspect of the invention, a method of determining a hydrogen fuel cell airflow closed loop response duration is provided, the method comprising:
determining a starting inflection point and an ending inflection point corresponding to the target stack inlet flow of the hydrogen fuel cell in the power-up stage of the hydrogen fuel cell system by using an inflection point detection function;
when the current power step load pulling is carried out on the power of the hydrogen fuel cell system, acquiring the air target stack entering flow corresponding to the ending inflection point;
determining the initial flow and the final flow of the actual air entering the reactor based on the target air entering the reactor flow corresponding to the end inflection point and the amplitude of the current power step pulling load;
and determining the closed loop response time of the air flow of the hydrogen combustion battery according to the sampling time corresponding to the initial flow and the sampling time corresponding to the final flow.
In the foregoing solution, the determining, by using an inflection point detection function, a starting inflection point and an ending inflection point of a target stack inlet flow of hydrogen fuel cell at a power-up stage of a hydrogen fuel cell system includes:
acquiring historical air flow data corresponding to historical power step load of the power of the hydrogen fuel cell system; the amplitude of the historical power step load is consistent with that of the current power step load;
based on a preset inflection point algorithm parameter combination, performing data analysis on the historical air flow data by using an inflection point detection function to obtain all inflection points of the air target stack entering flow;
extracting a starting inflection point and an ending inflection point corresponding to the air target stack inlet flow in a power-up stage of the hydrogen fuel cell system from all inflection points;
wherein the inflection point algorithm parameter combination comprises: a combination of a curve type of an air target in-stack flow response curve and an initial trend of the air target in-stack flow response curve.
In the above scheme, the obtaining of the target stack inlet flow rate of the air corresponding to the end inflection point includes:
determining a corresponding first target sampling time based on the end inflection point;
determining the air target stacking flow corresponding to the first target sampling moment from the acquired parameter data; the parameter data comprises the corresponding relation between the stack entering flow of the air target and the sampling time.
In the above scheme, the determining the initial flow rate and the final flow rate of the actual stack entering flow rate of the air based on the target stack entering flow rate of the air corresponding to the end inflection point and the amplitude of the current power step pulling load includes:
determining the maximum amplitude and the minimum amplitude of the current power step load;
determining the initial flow of the actual air entering flow according to the minimum amplitude and the target air entering flow corresponding to the ending inflection point; the initial flow is the product of the minimum amplitude and the air target stacking flow corresponding to the ending inflection point;
determining the final flow of the actual air entering flow according to the maximum amplitude and the target air entering flow corresponding to the end inflection point; the termination flow rate is the product of the maximum amplitude and the air target stack inlet flow rate corresponding to the termination inflection point.
In the above scheme, the determining the closed loop response time length of the air flow of the hydrogen fuel cell according to the sampling time corresponding to the initial flow and the sampling time corresponding to the final flow includes:
determining a first sampling time corresponding to the initial flow and a second sampling time corresponding to the termination flow from the acquired parameter data; the parameter data comprises the corresponding relation between the actual stack entering flow rate of the air and the sampling time;
and determining the closed loop response time length of the air flow of the hydrogen combustion battery based on the first sampling moment and the second sampling moment.
In the above scheme, before determining the first sampling time corresponding to the initial flow and the second sampling time corresponding to the end flow from the acquired parameter data, the method further includes:
if the fact that the abnormal air actual stack entering flow data exist in the acquired parameter data is determined, acquiring a second target sampling moment corresponding to the abnormal air actual stack entering flow data;
acquiring the actual pile entering flow data of the last air corresponding to the last sampling time at the second target sampling time;
and replacing the abnormal actual air stack inlet flow data by using the previous actual air stack inlet flow data.
In the above solution, determining the closed loop response time length of the airflow of the hydrogen fuel cell based on the first sampling time and the second sampling time includes:
and obtaining a time difference value between the second sampling moment and the first sampling moment, wherein the time difference value is the closed loop response time length of the air flow of the hydrogen fuel cell.
In a second aspect of the invention, an apparatus for determining a hydrogen fuel cell air flow closed loop response duration is provided, the apparatus comprising:
the first determining unit is used for determining a starting inflection point and an ending inflection point corresponding to the target stack inlet flow of the hydrogen fuel cell in the power-up stage of the hydrogen fuel cell system by using an inflection point detection function;
the acquiring unit is used for acquiring the air target stack entering flow corresponding to the ending inflection point when the current power step load pulling is carried out on the power of the hydrogen fuel cell system;
the second determining unit is used for determining the initial flow and the final flow of the actual air stacking flow based on the target air stacking flow corresponding to the end inflection point and the amplitude of the current power step pulling load;
and the third determining unit is used for determining the closed loop response time of the air flow of the hydrogen fuel cell according to the sampling time corresponding to the initial flow and the sampling time corresponding to the final flow.
In a third aspect of the invention, a computer-readable storage medium is provided, on which a computer program is stored which, when executed by a processor, performs the method of any one of the first aspects.
In a fourth aspect of the invention, there is provided a computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the method of any one of the first aspect when executing the program.
The invention provides a method, a device and equipment for determining closed loop response time of air flow of a hydrogen-combustion battery, wherein the method comprises the following steps: determining a starting inflection point and an ending inflection point corresponding to the target stack inlet flow of the hydrogen fuel cell in the power-up stage of the hydrogen fuel cell system by using an inflection point detection function; when the current power step load pulling is carried out on the power of the hydrogen fuel cell system, acquiring the air target stack entering flow corresponding to the ending inflection point; determining the initial flow and the final flow of the actual air entering the reactor based on the target air entering the reactor corresponding to the end inflection point and the amplitude of the current power step pulling load; determining the closed loop response time of the air flow of the hydrogen combustion battery according to the sampling time corresponding to the initial flow and the sampling time corresponding to the termination flow; therefore, the initial inflection point and the end inflection point of the target stack inlet flow of the air at the power-up stage of the hydrogen fuel cell can be accurately determined by utilizing the inflection point detection function to perform data analysis, so that the initial response time (sampling time corresponding to the initial flow) of the actual stack inlet flow of the air for power step load-pulling and the end response time (sampling time corresponding to the end flow) of the actual stack inlet flow of the air for power step load-pulling can be accurately determined, and the closed-loop response time of the air flow of the hydrogen fuel cell can be accurately determined; and then the work of type selection, electric pile parameter matching, control algorithm optimization and the like of the hydrogen fuel cell auxiliary system can be guided according to the closed-loop response time length, so that the performance of the hydrogen fuel cell can be effectively improved.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings.
In the drawings:
FIG. 1 is a schematic flow chart illustrating a method for determining a closed loop response time period of air flow of a hydrogen fuel cell according to an embodiment of the invention;
fig. 2 is a schematic diagram of power conditions when a hydrogen fuel cell system is subjected to power step load according to an embodiment of the present invention;
fig. 3 is a schematic diagram illustrating a response curve of an air target stack inlet flow rate when the hydrogen fuel cell system according to the embodiment of the present invention is performing a power step load;
fig. 4 to fig. 7 are schematic diagrams of inflection points corresponding to the determination of the target stack inlet flow rate of the hydrogen fuel cell air when the hydrogen fuel cell system is in power step load;
FIG. 8 is a schematic diagram of a ringing curve provided in accordance with an embodiment of the present invention;
FIG. 9 is a schematic diagram of a monotonically rising curve according to an embodiment of the present invention;
FIG. 10 is a schematic diagram of a configuration of an apparatus for determining a hydrogen fuel cell airflow closed loop response time period according to an embodiment of the present invention;
FIG. 11 is a schematic structural diagram of a computer device according to an embodiment of the present invention;
fig. 12 is a schematic structural diagram of a computer-readable storage medium according to an embodiment of the present invention.
Detailed Description
In order to better understand the technical solutions of the embodiments of the present specification, the technical solutions of the embodiments of the present specification are described in detail below with reference to the accompanying drawings and specific embodiments, and it should be understood that the specific features of the embodiments and examples of the present specification are detailed descriptions of the technical solutions of the embodiments of the present specification, and are not limitations of the technical solutions of the embodiments and examples of the present specification, and the technical features of the embodiments and examples of the present specification may be combined with each other without conflict.
In order to better understand the technical scheme of the present application, the concept of the hydrogen fuel cell air flow closed-loop response time period is introduced first. The closed-loop response time of the air flow of the hydrogen fuel cell is also called as the air flow control (closed-loop) response time of an air loop of the hydrogen fuel cell system, and refers to the time taken for the actual stack inlet flow of air to reach 90% of the target inlet flow of air from 10% of the target inlet flow of air when the target inlet flow of air is changed in a step mode. The shorter the response time, the better the performance of the hydrogen fuel cell system, and therefore the response time must be accurately determined.
The difficulty in determining the response time is that the target stack inlet flow rate of the air and the actual stack inlet flow rate of the air collected from the CAN bus are real-time variable quantities in the normal work of the hydrogen fuel cell system. From numerous real-time changing data, it is difficult to determine which time is the starting time and the ending time of the pile entering flow step of the air target; the present embodiment therefore provides a method for determining a closed loop response time for hydrogen fuel cell airflow based on the above problems, as shown in fig. 1, the method includes the steps of:
s110, determining a starting inflection point and an ending inflection point of the air target stack inlet flow of the hydrogen fuel cell corresponding to the power rising stage of the hydrogen fuel cell system by using an inflection point detection function;
in order to accurately determine the starting time and the ending time of the step of the target stack inlet flow rate of the air, the present embodiment determines the starting inflection point and the ending inflection point of the target stack inlet flow rate of the hydrogen fuel cell at the power-up stage of the hydrogen fuel cell system by using the inflection point detection function.
The inflection point detection function of the embodiment is a knelocator function of a kneed database of python, and the core is that each inflection point of the air target stack inlet flow in the power step load pulling stage is determined by utilizing a big data algorithm principle, so that the precision is high.
Then, in one embodiment, determining a starting inflection point and an ending inflection point of the hydrogen fuel cell air target stack inlet flow rate in the power-up stage of the hydrogen fuel cell system by using an inflection point detection function includes:
acquiring historical air flow data corresponding to the historical power step load pulling of the power of the hydrogen fuel cell system; the amplitude of the historical power step load is consistent with that of the current power step load;
based on a preset inflection point algorithm parameter combination, performing data analysis on historical air flow data by using an inflection point detection function to obtain all inflection points of the stack entering flow of an air target;
extracting a starting inflection point and an ending inflection point corresponding to the stack inlet flow of the air target in a power-up stage of the hydrogen fuel cell system from all inflection points;
the inflection point algorithm parameter combination comprises the following steps: the combination of the curve type of the air target inlet flow response curve and the initial trend of the air target inlet flow response curve.
Specifically, to ensure the accuracy of the knee point, the magnitude of the historical power step pull load is consistent with the magnitude of the current power step pull load when historical air flow data is obtained. Such as: the amplitude of the historical power step load and the amplitude of the current power step load can both be 10% -90% of the rated power.
Here, the historical air flow data includes: historical air target stack inlet flow data and historical air actual stack inlet flow data. When historical power step load pulling is carried out, historical air flow data are collected in real time through message signals of a CAN bus, and the collection period CAN be ms, such as 10 ms. Of course, the collected data may include other data such as state machine state, vehicle power demand, and hydrogen fuel cell output power. In addition, the method can also comprise the following steps: the method is used for judging the fault parameter data when the data acquisition is abnormal and other parameter data convenient for auxiliary data analysis, and can be specifically and automatically defined according to the characteristics of the hydrogen-fuel system without limitation.
It is noted that, when collecting data, it is necessary to ensure that data of the transient to steady state process in which the power of the hydrogen fuel cell is pulled from 8kW to 72kW can be collected completely, and it is also necessary to collect data corresponding to a period of time before the power pulling load starts and a period of time after the power pulling load is completed (for example, collecting 100s before the power pulling load starts and 100s after the power pulling load is 72 kW).
The entire data collection time period may be determined by the characteristics of the hydrogen combustion system, for example, the collection time period in the embodiment may be 1000 s.
The step change of the target stack inlet air flow is set as the step of the air flow of the power-up stage of the hydrogen-fuel system; the power-up stage of the hydrogen combustion system refers to the stage that the power of the hydrogen combustion system is pulled from 10% of rated power to 90% of rated power. For example, when the rated power of the hydrogen combustion system is 80kW, the power-up stage is a stage from 8kW to 72kW of load.
When the power of the hydrogen fuel cell system is subjected to power step load, the following steps are realized:
firstly, the hydrogen fuel cell system is started to be in an idle state for 100 s; then, carrying the power to 8kW, and keeping the power for more than 100 s; then, carrying the power from 8kW to 72kW, and keeping the power for more than 30 s; finally, the power is ramped down to 8kW for a further period of time. The time period for keeping 8kW can be set according to actual conditions, and is not limited herein. The resulting hydrogen fuel cell system operating conditions may be as shown in fig. 2.
When the power is stepped and loaded, the target stack inlet flow rate of the air has a corresponding response curve, which can be shown in fig. 3. In the embodiment, an inflection point detection function is utilized to determine the inflection point on the response curve of the air target stack inlet flow rate.
Here, the inflection point detect function is knelocator (x, y, curve, direction, online); wherein, the first and the second end of the pipe are connected with each other,
x is a horizontal axis data sequence corresponding to the data to be detected, such as sampling time;
y is a data sequence to be detected, and a corresponding value under the condition of x, such as the pile entering flow of an air target;
curve: str type, which is a curve type, includes two types: the covex represents that the curve is convex, and the covave represents that the curve is concave;
direction: and str, representing curve initial trend marking parameters, including two types: increasing indicates that the initial trend is an increasing pattern, and decreasing indicates a decreasing pattern;
online: the bol type, which is an identification pattern; the method comprises two steps: true represents an online identification mode, and each local inflection point is identified from right to left along the x axis in the online identification mode;
the inflection point algorithm combination of the present embodiment mainly includes the following four combinations:
when curve + direction is 'creating': representing a concave curve with an initial trend of increasing pattern;
when curve + direction is 'dividing': representing a concave curve with an initial trend in decreasing mode;
when curve ═ convergence '+ direction ═ creation': representing a curve that is convex and an initial trend that is an increasing pattern;
when curve ═ covex '+ direction ═ dividing': representing a curve that is convex and an initial trend that is a decreasing pattern;
that is, the inflection point algorithm parameter combination includes: the air target flow response curve is concave and the initial trend is an increasing mode,
Determining each inflection point time of the stack entering flow rate of the air target through four combined parameters of kneeLocator (), and referring to fig. 4 to 7, obtaining the four inflection point times and the corresponding stack entering flow rate of the air target.
In fig. 4 to 7, an inflection point S1 is a corresponding inflection point before the target stack air flow rate is stepped up in the power-up stage, an inflection point S2 is a corresponding inflection point after the target stack air flow rate is stepped up in the power-up stage, an inflection point S3 is a corresponding inflection point at the time when the target stack air flow rate is at the end of the steady state after the stack air flow rate is at the end of the steady state in the power-up stage, and an inflection point S3 is a corresponding inflection point at the end of the target stack air flow rate in the power-down stage.
After all inflection points are determined, the initial inflection point and the end inflection point, corresponding to the power-up stage of the hydrogen fuel cell system, of the target stack inlet flow of the air can be extracted from all the inflection points; that is, the initial inflection point is the inflection point of S1 and the ending inflection point is the inflection point of S2 in this embodiment.
S111, when the current power step load is carried out on the power of the hydrogen fuel cell system, acquiring the air target pile entering flow corresponding to the ending inflection point;
and after the initial inflection point and the ending inflection point of the air target stack inlet flow rate corresponding to the power boosting stage of the hydrogen fuel cell system are determined, performing current power step load-pulling on the power of the hydrogen fuel cell system to determine the closed-loop response time of the air flow rate of the hydrogen fuel cell.
The step mainly needs to obtain the air target stacking flow corresponding to the ending inflection point.
Specifically, when the current power step load is carried out, parameter data needs to be acquired simultaneously. As with the historical power step pull load, the parameter data may include: sampling time, actual air entering flow and target air entering flow; of course, the parameter data may also be determined according to actual needs, for example, the parameter data may further include: state machine state, vehicle power demand, hydrogen fuel cell output power, and the like. In addition, the parameter data may further include: the method is used for judging the fault when the data acquisition is abnormal and other parameter data convenient for auxiliary data analysis, and can be specifically defined according to the characteristics of the hydrogen-fuel system without limitation.
Similarly, when data is collected, it is required to ensure that data of a transient state to steady state process in which the power of the hydrogen fuel cell is pulled from 8kW to 72kW can be completely collected, and data corresponding to a period of time before the power pulling load starts and a period of time after the power pulling load is completed (for example, collecting 100s before the power pulling load starts and 100s after the power pulling load reaches 72 kW) is also required to be collected; the whole data acquisition time is also 1000 s.
And after the air target stacking flow is collected, acquiring the air target stacking flow corresponding to the ending inflection point, and determining the corresponding initial flow and the ending flow of the actual stacking flow of the air when the current power step load is carried according to the air target stacking flow corresponding to the ending inflection point.
It is noted that, when the current power step load is carried out, the type of the response curve of the actual stack inlet flow rate of the air from the transient state to the stable process can be a decaying oscillation type, and can also be a monotone rising type. Wherein, the decaying oscillation type curve can be shown as fig. 8, and the monotone rising type curve can be shown as fig. 9.
There is a time length of the closed loop response of the air flow rate in either the damping oscillation type curve or the monotone rising type curve, so there are a start inflection point S1 and an end inflection point S2 corresponding to the target stack flow rate of air in the power-up phase of the hydrogen fuel cell system in fig. 8 and 9.
In one embodiment, acquiring the target stack inlet flow rate of the air corresponding to the end inflection point comprises the following steps:
determining a corresponding first target sampling time based on the end inflection point;
and determining the stack entering flow of the air target corresponding to the first target sampling moment from the acquired parameter data, wherein the parameter data comprises the corresponding relation between the stack entering flow of the air target and the sampling moment.
Thus, the target stack inlet flow rate of the air corresponding to the ending inflection point S2 is determined. The target stack inlet flow rate of air f corresponding to the end inflection point S2 in fig. 8 and 9trg。
S112, determining the initial flow and the final flow of the actual air entering the pile based on the target air entering pile flow corresponding to the end inflection point and the amplitude of the current power step pulling load;
after the target air in-pile flow corresponding to the ending inflection point is determined, the initial flow and the final flow of the actual air in-pile flow can be determined based on the target air in-pile flow corresponding to the ending inflection point and the amplitude of the current power step load.
In one embodiment, the determining of the initial flow rate and the final flow rate of the actual stacking flow rate of the air based on the target stacking flow rate of the air corresponding to the end inflection point and the amplitude of the current power step pulling load comprises:
determining the maximum amplitude and the minimum amplitude of the current power step load;
determining the initial flow of the actual air entering into the pile according to the minimum amplitude and the target air entering into the pile corresponding to the ending inflection point; the initial flow is the product of the minimum amplitude and the air target stacking flow corresponding to the ending inflection point;
determining the end flow of the actual air entering flow according to the maximum amplitude and the air target entering flow corresponding to the end inflection point; the final flow rate is the product of the maximum amplitude and the target stack-entering flow rate of the air corresponding to the final inflection point.
That is, when the power of the hydrogen combustion system is pulled from 10% of the rated power to 90% of the rated power, the minimum amplitude of the current power step pulling load is 10%, and the maximum amplitude is 90%; the initial flow f of the actual stack inlet flow of air can be determined based on the following formula (1)QBased on the following formula (2) Determining the end flow f of the actual flow of air into the pileR：
fQ＝ftrg×10％ (1)
fR＝ftrg×90％ (2)
Thus, the initial flow and the final flow of the actual stack entering flow of the air when the current power step load is carried out are determined.
And S113, determining the closed loop response time of the air flow of the hydrogen fuel cell according to the sampling time corresponding to the initial flow and the sampling time corresponding to the final flow.
After the initial flow and the final flow of the actual stack inlet flow of the air are determined, the closed-loop response time of the air flow of the hydrogen fuel cell can be determined according to the sampling time corresponding to the initial flow and the sampling time corresponding to the final flow, and the closed-loop response time comprises the following steps:
determining a first sampling moment corresponding to the initial flow and a second sampling moment corresponding to the final flow from the acquired parameter data; the parameter data comprises the corresponding relation between the actual stack inlet flow of the air and the sampling time;
and determining the closed loop response time length of the air flow of the hydrogen combustion battery based on the first sampling time and the second sampling time.
As can be seen from fig. 5 and 6, the first sampling instant is tQThe second sampling time is tR。
In one embodiment, determining the hydrogen fuel cell air flow closed loop response time period based on the first sample time and the second sample time comprises:
and obtaining a time difference value between the second sampling moment and the first sampling moment, wherein the time difference value is the closed loop response time length of the air flow of the hydrogen combustion battery.
That is, the hydrogen fuel cell airflow closed loop response time period t may be determined according to equation (3):
t＝tR-tQ (3)
in the formula (3), tQIs the first sampling time, tRIs the second sampling instant.
It should be noted that, in the collecting process, abnormal data may occur in the actual stack flow data of the air, for example, missing values, abnormal values, inconsistent values, repeated data, special symbols, and the like may exist. Therefore, it is further required to determine whether the actual reactor entering flow data is abnormal, and if the actual reactor entering flow data is abnormal, the method further includes:
if the fact that the abnormal air actual pile entering flow data exist in the acquired parameter data is determined, a second target sampling moment corresponding to the abnormal air actual pile entering flow data is obtained;
acquiring the actual pile entering flow data of the last air corresponding to the last sampling time at the second target sampling time;
and replacing the abnormal actual stack air inlet flow data corresponding to the second target sampling moment by using the previous actual stack air inlet flow data.
In one embodiment, determining whether there is an anomaly in the actual reactor inlet flow data is accomplished as follows:
summarizing statistics of parameter data can be checked through df.describle () and df.info () functions, and missing value fields and the number of actual heap entering flow data are obtained;
the maximum value and the minimum value of the actual heap entry flow data can be returned through the functions df.max () and df.min (); and drawing a normal distribution diagram of the actual reactor inlet flow data through a SEABORN drawing tool of Python to obtain an abnormal point of the actual reactor inlet flow data.
In the embodiment, the continuity of the closed-loop control of the air circuit flow is considered, and the missing value of the actual stack inlet flow data of the extremely individual air can be filled by the air flow value at the previous moment; if the air flow value rises abnormally and is obviously higher than other values at the moment when the air loop flow just steps to the high point, the abnormal value can be replaced by adopting the air actual progress flow data at the previous moment.
Therefore, effective and high-quality actual air stacking flow data can be obtained, and a data basis is provided for improving the precision of the closed-loop response time.
In the embodiment, real and effective air flow data are collected, and finally, under the working condition that the hydrogen fuel cell system is under the power from 8kW to 72kW, a KneeLocator module function of a kneed database is utilized to set KneeLocator () call of four possible combination parameters, and the start-stop time (inflection point) of the step generated by the air target reactor inlet flow is accurately obtained, so that the start response time (sampling time corresponding to the start flow) of the actual reactor inlet flow of the air aiming at the power step pulling load and the end response time (sampling time corresponding to the end flow) of the actual reactor inlet flow of the air aiming at the power step pulling load are accurately determined on the basis, and the closed-loop response time of the air flow of the hydrogen fuel cell can be accurately determined; and further, the type selection of the hydrogen fuel cell auxiliary system, the electric pile parameter matching, the optimization of the FCCU controller control algorithm and the like can be guided according to the closed-loop response time length, so that the performance of the hydrogen fuel cell is effectively improved.
Based on the same inventive concept, the present embodiment further provides an apparatus for determining a closed loop response time period of air flow of a hydrogen fuel cell, as shown in fig. 10, the apparatus comprising:
the first determining unit 101 is configured to determine, by using an inflection point detection function, a starting inflection point and an ending inflection point corresponding to a target stack inlet flow of the hydrogen fuel cell in a power-up stage of the hydrogen fuel cell system;
an obtaining unit 102, configured to obtain a target stack entering flow rate of air corresponding to the end inflection point when the current power step pulling load is performed on the power of the hydrogen fuel cell system;
a second determining unit 103, configured to determine an initial flow and a final flow of the actual stack entering flow of air based on the target stack entering flow of air corresponding to the end inflection point and the amplitude of the current power step pulling load;
and a third determining unit 104, configured to determine a closed loop response duration of the air flow of the hydrogen fuel cell according to the sampling time corresponding to the initial flow and the sampling time corresponding to the end flow.
The specific functions of the above units can be referred to the corresponding descriptions in the above method embodiments, and are not described herein again. Since the apparatus described in the embodiment of the present invention is an apparatus used for implementing the method in the embodiment of the present invention, a person skilled in the art can understand the specific structure and the deformation of the apparatus based on the method described in the embodiment of the present invention, and thus the detailed description is omitted here. All devices used in the method of the embodiment of the present invention belong to the protection scope of the present invention.
The present embodiment provides a computer device 1100, as shown in fig. 11, including a memory 1110, a processor 1120, and a computer program 1111 stored on the memory 1110 and operable on the processor 1120, wherein the processor 1120, when executing the computer program 1111, implements the following steps:
determining a starting inflection point and an ending inflection point corresponding to the target stack inlet flow of the hydrogen fuel cell in the power-up stage of the hydrogen fuel cell system by using an inflection point detection function;
when the current power step load pulling is carried out on the power of the hydrogen fuel cell system, acquiring the air target stack entering flow corresponding to the ending inflection point;
determining the initial flow and the final flow of the actual air entering the reactor based on the target air entering the reactor flow corresponding to the end inflection point and the amplitude of the current power step pulling load;
and determining the closed loop response time of the air flow of the hydrogen combustion battery according to the sampling time corresponding to the initial flow and the sampling time corresponding to the final flow.
In particular implementations, any of the preceding embodiments may be implemented when processor 1120 executes computer program 1111.
Since the computer device described in the present embodiment is used to implement the method for determining the closed-loop response time of the hydrogen fuel cell air flow rate according to the embodiment of the present application, a person skilled in the art can understand the specific implementation of the computer device of the present embodiment and its various modifications based on the methods described in the previous embodiments of the present application, and therefore, a detailed description of how the server implements the method in the embodiment of the present application is not provided herein. The equipment used by those skilled in the art to implement the method in the embodiments of the present application is all within the protection scope of the present application.
Based on the same inventive concept, the present embodiment provides a computer-readable storage medium 1200 as shown in fig. 12, on which a computer program 1211 is stored, the computer program 1211 implementing the steps when executed by a processor:
determining a starting inflection point and an ending inflection point corresponding to the target stack inlet flow of the hydrogen fuel cell in the power-up stage of the hydrogen fuel cell system by using an inflection point detection function;
when the current power step load-pulling is carried out on the power of the hydrogen fuel cell system, acquiring the air target pile entering flow rate corresponding to the ending inflection point;
determining the initial flow and the final flow of the actual air entering the reactor based on the target air entering the reactor corresponding to the end inflection point and the amplitude of the current power step pulling load;
and determining the closed loop response time of the air flow of the hydrogen combustion battery according to the sampling time corresponding to the initial flow and the sampling time corresponding to the final flow.
In particular embodiments, the computer program 1211 may implement any of the embodiments described above when executed by a processor.
The method, the device and the equipment for determining the closed loop response time of the air flow of the hydrogen-gas battery provided by the embodiment of the invention have the beneficial effects that at least:
the invention provides a method, a device and equipment for determining closed loop response time of air flow of a hydrogen-combustion battery, wherein the method comprises the following steps: determining a starting inflection point and an ending inflection point corresponding to the target stack inlet flow of the hydrogen fuel cell in the power-up stage of the hydrogen fuel cell system by using an inflection point detection function; when the current power step load pulling is carried out on the power of the hydrogen fuel cell system, acquiring the air target stack entering flow corresponding to the ending inflection point; determining the initial flow and the final flow of the actual air entering the reactor based on the target air entering the reactor flow corresponding to the end inflection point and the amplitude of the current power step pulling load; determining the closed loop response time of the air flow of the hydrogen fuel cell according to the sampling time corresponding to the initial flow and the sampling time corresponding to the final flow; therefore, the initial inflection point and the end inflection point of the target stack inlet flow of the air at the power-up stage of the hydrogen fuel cell can be accurately determined by utilizing the inflection point detection function to perform data analysis, so that the initial response time (sampling time corresponding to the initial flow) of the actual stack inlet flow of the air for power step load-pulling and the end response time (sampling time corresponding to the end flow) of the actual stack inlet flow of the air for power step load-pulling can be accurately determined, and the closed-loop response time of the air flow of the hydrogen fuel cell can be accurately determined; and then the work of the type selection, the electric pile parameter matching, the optimization of the control algorithm and the like of the hydrogen fuel cell auxiliary system can be guided according to the closed-loop response time length, so that the performance of the hydrogen fuel cell can be effectively improved.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, and any modifications, equivalents, improvements, etc. that are within the spirit and principle of the present invention should be included in the present invention.
Claims (10)
1. A method of determining a hydrogen fuel cell airflow closed loop response period, the method comprising:
determining a starting inflection point and an ending inflection point corresponding to the target stack inlet flow of the hydrogen fuel cell in the power-up stage of the hydrogen fuel cell system by using an inflection point detection function;
when the current power step load-pulling is carried out on the power of the hydrogen fuel cell system, acquiring the air target pile entering flow rate corresponding to the ending inflection point;
determining the initial flow and the final flow of the actual air entering the reactor based on the target air entering the reactor flow corresponding to the end inflection point and the amplitude of the current power step pulling load;
and determining the closed loop response time of the air flow of the hydrogen combustion battery according to the sampling time corresponding to the initial flow and the sampling time corresponding to the final flow.
2. The method of claim 1, wherein determining a start inflection point and an end inflection point of a hydrogen fuel cell air target stack inlet flow rate in a hydrogen fuel cell system power-up phase using an inflection point detect function comprises:
acquiring historical air flow data corresponding to historical power step load of the power of the hydrogen fuel cell system; the amplitude of the historical power step load is consistent with that of the current power step load;
based on a preset inflection point algorithm parameter combination, performing data analysis on the historical air flow data by using an inflection point detection function to obtain all inflection points of the stack entering flow of the air target;
extracting a starting inflection point and an ending inflection point corresponding to the air target stack inlet flow in a power-up stage of the hydrogen fuel cell system from all inflection points;
wherein the inflection point algorithm parameter combination comprises: the combination of the curve type of the air target inlet flow response curve and the initial trend of the air target inlet flow response curve.
3. The method of claim 1, wherein the obtaining of the target stack inlet air flow corresponding to the end inflection point comprises:
determining a corresponding first target sampling time based on the end inflection point;
determining the air target pile entering flow rate corresponding to the first target sampling moment from the acquired parameter data; the parameter data comprises the corresponding relation between the stack entering flow of the air target and the sampling time.
4. The method of claim 1, wherein the determining the start flow rate and the end flow rate of the actual stack inlet flow rate of air based on the target stack inlet flow rate of air corresponding to the end inflection point and the magnitude of the current secondary power step load comprises:
determining the maximum amplitude and the minimum amplitude of the current power step load;
determining the initial flow of the actual air entering flow according to the minimum amplitude and the target air entering flow corresponding to the ending inflection point; the initial flow is the product of the minimum amplitude and the air target stack inlet flow corresponding to the end inflection point;
determining the final flow of the actual air entering flow according to the maximum amplitude and the target air entering flow corresponding to the final inflection point; the termination flow rate is the product of the maximum amplitude and the air target stack inlet flow rate corresponding to the termination inflection point.
5. The method of claim 1, wherein determining the closed loop response time duration for the hydrogen fuel cell airflow based on the sampling time corresponding to the start flow and the sampling time corresponding to the end flow comprises:
determining a first sampling time corresponding to the initial flow and a second sampling time corresponding to the termination flow from the acquired parameter data; the parameter data comprises the corresponding relation between the actual stack entering flow rate of the air and the sampling time;
and determining the closed loop response time length of the air flow of the hydrogen combustion battery based on the first sampling time and the second sampling time.
6. The method of claim 5, wherein the determining the first sampling time corresponding to the start flow rate and the second sampling time corresponding to the end flow rate from the collected parameter data is preceded by:
if the fact that the abnormal air actual stacking flow data exists in the acquired parameter data is determined, acquiring a second target sampling moment corresponding to the abnormal air actual stacking flow data;
acquiring the actual pile entering flow data of the last air corresponding to the last sampling time at the second target sampling time;
and replacing the abnormal actual air stack inlet flow data by using the previous actual air stack inlet flow data.
7. The method of claim 5, wherein determining a hydrogen fuel cell airflow closed loop response duration based on the first sample time and the second sample time comprises:
and obtaining a time difference value between the second sampling moment and the first sampling moment, wherein the time difference value is the closed loop response time length of the air flow of the hydrogen combustion battery.
8. An apparatus for determining a duration of a closed loop response to hydrogen fuel cell airflow, the apparatus comprising:
the first determining unit is used for determining a starting inflection point and an ending inflection point corresponding to the target stack inlet flow of the hydrogen fuel cell in the power-up stage of the hydrogen fuel cell system by using an inflection point detection function;
the acquisition unit is used for acquiring the air target stack entering flow corresponding to the ending inflection point when the current power step load is carried out on the power of the hydrogen fuel cell system;
the second determining unit is used for determining the initial flow and the final flow of the actual stack entering flow of the air based on the target stack entering flow of the air corresponding to the end inflection point and the amplitude of the current power step pulling load;
and the third determining unit is used for determining the closed loop response time of the air flow of the hydrogen fuel cell according to the sampling time corresponding to the initial flow and the sampling time corresponding to the final flow.
9. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the method of any one of claims 1 to 7.
10. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the method of any of claims 1 to 7 when executing the program.
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