A fuel cell air compressor protection method, system, computer equipment and storage medium

Abstract

The present invention relates to the field of fuel cell technology, and discloses a fuel cell air compressor protection method, system, computer equipment, and storage medium, comprising the following steps: obtaining operating parameters of the air compressor; calculating the corrected inlet flow and actual pressure ratio of the air compressor; setting a surge line, a surge protection line, and a blockage line of the air compressor; the surge line, the surge protection line, and the blockage line divide the working state of the air compressor into a surge state, a surge protection state, a normal state, and a blockage state; and judging the working state of the air compressor based on the corrected inlet flow and the actual pressure ratio. The area where the air compressor is located can be determined based on the calculated corrected inlet flow and the actual pressure ratio. If the air compressor is in the surge protection zone, the corrected inlet flow of the air compressor can be adjusted in advance so that the corrected inlet flow of the air compressor is away from the surge line, thus preventing the air compressor from entering a surge state, thereby providing an early warning, avoiding damage to the air compressor, and increasing the service life of the air compressor.

Description

Technical field

[0001] The present invention relates to the technical field of fuel cells, and in particular to a fuel cell air compressor protection method, system, computer equipment and storage medium. [Background Technology]

[0002] The air compressor is known as the "lungs" of the fuel cell system, providing the air required for the fuel cell to operate. As the air compressor's operating time increases, changes in the air compressor inlet flow and pressure ratio will cause changes in the air compressor's operating state. The air compressor may change from a normal operating state to a surge state or a blocked state, causing damage to the air compressor and malfunctioning.

[0003] Currently, the commonly used air compressor diagnosis and protection method mainly determines the status of the air compressor by monitoring the fluctuation of the rear-end pressure of the air compressor, that is, the data anomalies caused by surge or blockage. However, when the rear-end pressure fluctuates abnormally, the air compressor surge or blockage has been triggered for a period of time, causing a certain degree of damage to the air compressor body. The existing methods lack the ability to predict surge or blockage in advance. [Summary of the invention]

[0004] The present invention aims to solve the above problems and provides a fuel cell air compressor protection method, system, computer equipment and storage medium to solve the problem that the existing air compressor cannot predict the surge state in advance, resulting in the air compressor being easily damaged.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] A fuel cell air compressor protection method includes the following steps:

[0007] Get the operating parameters of the air compressor;

[0008] Calculate the corrected inlet flow and actual pressure ratio of the air compressor;

[0009] Set the surge line, surge protection line and blocking line of the air compressor;

[0010] The working state of the air compressor is divided into surge state, surge protection state, normal state and blocked state by the surge line, surge protection line and blocking line;

[0011] Determine the working status of the air compressor based on the corrected inlet flow and actual pressure ratio;

[0012] If the air compressor is in surge protection state, adjust the corrected inlet flow of the air compressor to return the air compressor to normal state.

[0013] Preferably, determining whether the air compressor is in a surge state includes the following steps:

[0014] Obtain surge flow and surge standard pressure ratio according to the surge line, wherein the surge flow includes a minimum surge flow and a maximum surge flow;

[0015] When the corrected inlet flow rate is less than the minimum surge flow rate, the air compressor is in a surge state;

[0016] When the corrected inlet flow rate is greater than the minimum surge flow rate and less than the maximum surge flow rate, and the actual pressure ratio is greater than the standard surge pressure ratio, the air compressor is in a surge state.

[0017] Preferably, determining whether the air compressor is in a blocked state includes the following steps:

[0018] Obtain the blocking flow and blocking standard pressure ratio according to the blocking line, wherein the blocking flow includes the blocking minimum flow and the blocking maximum flow;

[0019] When the corrected inlet flow rate is greater than the maximum blocking flow rate, the air compressor is in a blocking state;

[0020] When the corrected inlet flow rate is less than the maximum blocking flow rate and greater than the minimum blocking flow rate, and the actual pressure ratio is less than the blocking standard pressure ratio, the air compressor is in a blocking state.

[0021] Preferably, determining whether the air compressor is in a surge protection state includes the following steps:

[0022] Obtaining a surge protection flow rate and a surge protection pressure ratio according to the surge protection line, wherein the surge protection pressure ratio has a value range consistent with the surge standard pressure ratio;

[0023] When the actual pressure ratio, the surge protection pressure ratio and the surge standard pressure ratio are consistent, and the corrected inlet flow rate is greater than the surge flow rate and less than the surge protection flow rate, the air compressor is in a surge protection state.

[0024] Preferably, determining the effectiveness of the working state of the air compressor includes the following steps:

[0025] Calculate the corrected speed of the air compressor and obtain the standard minimum speed and standard maximum speed of the air compressor;

[0026] When the corrected speed is between the standard minimum speed and the standard maximum speed, and the air compressor maintains the current working state for more than 5 working cycles, it is determined that the current working state of the air compressor is valid;

[0027] Among them, the working cycle is 0.1s-0.5s.

[0028] Preferably, when the air compressor is in surge protection state, the following control steps are included:

[0029] A first correction strategy is set, where the first correction strategy includes:

[0030] Increase the opening of the back pressure valve, reduce the rear end flow resistance of the air compressor, increase the corrected inlet flow, and / or;

[0031] Increase the opening of the proportional valve and the actual speed of the air compressor to increase the corrected inlet flow;

[0032] Among them, the change range of the back pressure valve opening, the proportional valve opening and the corrected speed of the air compressor is △ɑ1;

[0033] The air compressor repeatedly runs the first correction strategy until the air compressor returns to a normal state from the surge protection state.

[0034] Preferably, when the air compressor is in a surge state, the following control steps are included:

[0035] Setting a second correction strategy, wherein the second correction strategy increases the opening of the back pressure valve, the opening of the proportional valve, and the corrected speed of the air compressor based on the first correction strategy;

[0036] Among them, the change range of the back pressure valve opening, the proportional valve opening and the actual speed of the air compressor is △ɑ2, and △ɑ2>△ɑ1;

[0037] Set the surge correction times, and the air compressor will run the second correction strategy. If the air compressor does not return to normal within the surge correction times, the air compressor will perform an emergency shutdown.

[0038] Preferably, when the air compressor is in a blocked state, the following control steps are included:

[0039] A third correction strategy is set, wherein the third correction strategy includes:

[0040] Reduce the opening of the back pressure valve, increase the rear end flow resistance of the air compressor, reduce the corrected inlet flow, and / or;

[0041] Reduce the opening of the proportional valve and the actual speed of the air compressor to reduce the corrected inlet flow;

[0042] Among them, the change range of the back pressure valve opening, the proportional valve opening and the corrected speed of the air compressor is △ɑ3, and △ɑ3>△ɑ2;

[0043] Set the number of blockage correction times, and the air compressor will run the third correction strategy. If the air compressor does not return to normal status within the blockage correction number, the air compressor will perform emergency shutdown.

[0044] A fuel cell system air compressor protection system, applied to the protection method, comprises:

[0045] a collection and calculation module for collecting operating parameters of the air compressor, the operating parameters including actual inlet flow rate, inlet air temperature, inlet pressure, actual speed, and outlet pressure, and calculating the corrected inlet flow rate, actual pressure ratio, and corrected speed of the air compressor based on the collected operating parameters, thereby determining the working state of the air compressor;

[0046] The validation module is used to detect the validity of the working state of the air compressor;

[0047] Correction module, used to provide correction strategies for air compressors in surge transition state, surge protection state and blocked state;

[0048] The control module selects an appropriate correction strategy based on the data obtained by the acquisition and calculation module and imports it into the air compressor to enable the air compressor to return to normal state.

[0049] A computer device comprising:

[0050] memory and processor;

[0051] The memory is used to store at least one program;

[0052] When the program is executed by a processor, the processor implements the above control method.

[0053] A storage medium includes a computer program, and when the computer program is executed by a processor, the control method is implemented.

[0054] The contribution of the present invention is that the area where the air compressor is located can be determined based on the calculated corrected inlet flow and actual pressure ratio. If the air compressor is in the surge protection zone, the corrected inlet flow of the air compressor can be adjusted in advance so that the corrected inlet flow of the air compressor is away from the surge line, avoiding the air compressor from entering the surge state, playing the role of early warning, avoiding damage to the air compressor, and increasing the service life of the air compressor.

Brief Description of the Drawings

[0055] Figure 1 1. It is a schematic diagram of the steps of the air compressor protection method of the present invention;

[0056] Figure 2 This is a schematic diagram of the relationship between the surge line, surge protection line, and blocking line of the air compressor of the present invention;

[0057] Figure 3 This is a schematic diagram of the control flow when the air compressor of the present invention is in a surge protection state;

[0058] Figure 4 This is a schematic diagram of the control flow when the air compressor of the present invention is in a surge state;

[0059] Figure 5This is a schematic diagram of the control flow when the air compressor of the present invention is in a blocked state

[0060] Figure 6 It is a schematic diagram of the relationship between the surge line, surge protection line, blocking protection line and blocking line of the present invention;

[0061] Figure 7 This is a schematic diagram of the control flow when the air compressor of the present invention is in a blocking protection state;

[0062] Figure 8 It is a schematic diagram of a flow chart for judging the effectiveness of the working state of the air compressor of the present invention;

[0063] Figure 9 is a schematic diagram of the air compressor protection system of the present invention;

[0064] Figure 10 It is a schematic diagram of the computer device of the present invention. [Specific implementation method]

[0065] To facilitate understanding of this application, a more comprehensive description of this application will be provided below with reference to the accompanying drawings. The drawings illustrate embodiments of this application. However, this application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to make the disclosure of this application more thorough and comprehensive.

[0066] It is understood that the terms "first," "second," and the like used herein may be used to describe various elements herein, but these elements are not limited by these terms. These terms are used only to distinguish a first element from another element. It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to the other element or connected to the other element through an intermediate element. In addition, the "connection" in the following embodiments should be understood as "electrical connection," "communication connection," etc., if there is transmission of electrical signals or data between the connected objects.

[0067] As used herein, the singular forms "a," "a person," and "the" may also include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include," "comprising," "having," etc. specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

[0068] Example 1

[0069] like Figure 1 As shown, a fuel cell air compressor protection method includes the following steps:

[0070] Get the operating parameters of the air compressor;

[0071] Calculate the corrected inlet flow and actual pressure ratio of the air compressor through operating parameters;

[0072] Set the surge line, surge protection line and blocking line of the air compressor;

[0073] The working state of the air compressor is divided into surge state, surge protection state, normal state and blocked state by the surge line, surge protection line and blocking line;

[0074] Determine the working status of the air compressor based on the corrected inlet flow and actual pressure ratio;

[0075] If the air compressor is in surge protection state, adjust the corrected inlet flow of the air compressor to return the air compressor to normal state.

[0076] In this embodiment, the air compressor operating parameters include the actual inlet flow rate, inlet air temperature, actual speed (used to calculate the corrected speed), inlet pressure, and outlet pressure of the air compressor. The corrected inlet flow rate and actual pressure ratio of the air compressor are calculated based on the above operating parameters. The specific calculation formula is as follows:

[0077]

[0078]

[0079] Where MFcC is the corrected inlet flow rate of the air compressor, TTCI is the inlet air temperature of the air compressor, PTCI is the inlet pressure of the air compressor, PTRC is the actual pressure ratio of the air compressor, and PTCO is the outlet pressure of the air compressor.

[0080] Further explanation, such as Figure 2 As shown, the surge line and the blocking line of the air compressor can be obtained from the performance diagram of the air compressor, wherein the surge line is the critical line for the air compressor to enter the surge state, and the blocking line is the critical line for the air compressor to enter the blocking state. In this embodiment, a surge protection line is set between the surge line and the blocking line. The surge protection line plays an early warning role, and the surge state of the air compressor can be predicted in advance, and the air compressor can be adjusted in advance to avoid the air compressor from entering the surge state and avoid damage to the air compressor.

[0081] Specifically, the surge line, surge protection line and blocking line divide the working state of the air compressor into surge state, surge protection state, normal state and blocking state, among which the area on the left side of the surge line is the surge zone (the working state of the air compressor when it falls into the surge zone is the surge state), the area between the surge line and the surge protection line is the surge protection zone (corresponding to the surge protection state of the air compressor), the area between the surge protection line and the blocking line is the normal working zone (corresponding to the normal state of the air compressor), and the area to the right of the blocking line is the blocking zone (corresponding to the blocking state of the air compressor). The area where the air compressor is located can be determined based on the calculated corrected inlet flow and actual pressure ratio. If the air compressor is in the surge protection zone, the corrected inlet flow of the air compressor can be adjusted in advance to keep the corrected inlet flow of the air compressor away from the surge line, thereby preventing the air compressor from entering the surge state, playing the role of early warning, and avoiding damage to the air compressor.

[0082] Further description of this embodiment, such as Figure 2 As shown, judging whether the air compressor is in surge state includes the following steps:

[0083] Obtain surge flow and surge standard pressure ratio according to the surge line, wherein the surge flow includes a minimum surge flow and a maximum surge flow;

[0084] When the corrected inlet flow rate is less than the minimum surge flow rate, the air compressor is in a surge state;

[0085] When the corrected inlet flow rate is greater than the minimum surge flow rate and less than the maximum surge flow rate, and the actual pressure ratio is greater than the standard surge pressure ratio, the air compressor is in a surge state.

[0086] Specifically, the surge line is composed of the surge flow and the surge standard pressure ratio. The surge line is the critical line for judging whether the air compressor is in a surge state. When the corrected inlet flow is less than the minimum surge flow, no matter what the actual pressure ratio of the air compressor is at this time, the intersection of the corrected inlet flow and the actual pressure ratio of the air compressor must fall into the surge zone. At this time, the air compressor is in a surge state. When the corrected inlet flow is between the minimum surge flow and the maximum surge flow, and the actual pressure ratio corresponding to the corrected inlet flow is greater than the surge standard pressure ratio corresponding to the surge flow (the same value as the corrected inlet flow), the intersection of the corrected inlet flow and the actual pressure ratio of the air compressor must be located above the surge line, that is, it falls into the surge zone. At this time, the air compressor is in a surge state.

[0087] Further description of this embodiment, such as Figure 2 As shown, determining whether the air compressor is in a blocked state includes the following steps:

[0088] Obtain the blocking flow and blocking standard pressure ratio according to the blocking line, wherein the blocking flow includes the blocking minimum flow and the blocking maximum flow;

[0089] When the corrected inlet flow rate is greater than the maximum blocking flow rate, the air compressor is in a blocking state;

[0090] When the corrected inlet flow rate is less than the maximum blocking flow rate and greater than the minimum blocking flow rate, and the actual pressure ratio is less than the blocking standard pressure ratio, the air compressor is in a blocking state.

[0091] Specifically, the blocking line is composed of the blocking flow and the blocking standard pressure ratio. The blocking line is the critical line for judging whether the air compressor is in a blocking state. When the corrected inlet flow is greater than the maximum blocking flow, no matter what the actual pressure ratio of the air compressor is at this time, the intersection of the corrected inlet flow and the actual pressure ratio of the air compressor must fall into the blocking area. At this time, the air compressor is in a blocking state. When the corrected inlet flow is less than the maximum blocking flow and greater than the minimum blocking flow, and the actual pressure ratio corresponding to the corrected inlet flow is less than the blocking standard pressure ratio corresponding to the blocking flow (the same value as the corrected inlet flow), the intersection of the corrected inlet flow of the air compressor and the actual pressure ratio must fall below the blocking line, that is, fall into the blocking area, and the air compressor is in a blocking state.

[0092] Further description of this embodiment, such as Figure 2 As shown, judging whether the air compressor is in surge protection state includes the following steps:

[0093] Obtaining a surge protection flow rate and a surge protection pressure ratio according to the surge protection line, wherein the surge protection pressure ratio has a value range consistent with the surge standard pressure ratio;

[0094] When the actual pressure ratio, the surge protection pressure ratio and the surge standard pressure ratio are consistent, and the corrected inlet flow rate is greater than the surge flow rate and less than the surge protection flow rate, the air compressor is in a surge protection state.

[0095] Specifically, the surge protection line plays a warning role. The setting of the surge protection line can effectively remind the staff of the current working status of the air compressor, and adjust the air compressor in time to avoid the air compressor entering the surge state or the blocked state before making adjustments. At this time, the air compressor has suffered certain damage. Furthermore, the surge protection line is set between the surge line and the blocked line. The surge protection pressure ratio of the surge protection line is consistent with the surge standard pressure ratio value range of the surge line. Under the same pressure ratio, the difference between the surge protection flow of the surge protection line and the surge flow of the surge line is between 1g / s-2g / s. When the corrected inlet flow corresponding to the actual pressure ratio is between the surge protection flow corresponding to the surge protection pressure ratio (the same value as the actual pressure ratio) and the surge flow corresponding to the surge pressure ratio (the same value as the actual pressure ratio), the intersection of the corrected inlet flow of the air compressor and the actual pressure ratio will inevitably fall into the surge protection zone, and the air compressor is in the surge protection state at this time.

[0096] Further description of this embodiment, such as Figure 3As shown in the figure, when the air compressor is in surge protection state, the control steps include the following:

[0097] A first correction strategy is set, where the first correction strategy includes:

[0098] Increase the opening of the back pressure valve, reduce the rear end flow resistance of the air compressor, increase the corrected inlet flow, and / or;

[0099] Increase the opening of the proportional valve and the actual speed of the air compressor to increase the corrected inlet flow;

[0100] Among them, the change range of the back pressure valve opening, the proportional valve opening and the actual speed of the air compressor is △ɑ1;

[0101] The air compressor repeatedly runs the first correction strategy until the air compressor returns to a normal state from the surge protection state.

[0102] Specifically, the first correction strategy is for an air compressor in a surge protection state. By increasing the opening of the back pressure valve, the flow resistance at the rear end of the air compressor can be reduced, thereby increasing the actual inlet flow of the air compressor (the first adjustment method). Since the actual inlet flow is directly proportional to the corrected inlet flow, the increase in the actual inlet flow will lead to an increase in the corrected inlet flow, and the intersection of the corrected inlet flow and the actual pressure ratio moves to the right. Since the air compressor is not in a surge state at this time, the air compressor is not damaged. The air compressor can repeatedly run the first correction strategy until the intersection of the corrected inlet flow and the actual pressure ratio falls into the working area, and the air compressor returns to normal from the surge protection state.

[0103] In addition, the corrected inlet flow rate can be increased by increasing the opening of the proportional valve and increasing the actual speed of the air compressor (the second adjustment method). Specifically, the proportional valve is located at the front end of the air compressor. Increasing the opening of the proportional valve can increase the amount of air at the cathode of the fuel cell stack. At the same time, the actual speed of the air compressor is increased (the actual speed is proportional to the actual speed), thereby increasing the actual inlet flow rate of the air compressor, thereby increasing the corrected inlet flow rate. Correspondingly, the intersection of the corrected inlet flow rate of the air compressor and the actual pressure ratio moves to the right and falls into the working area, and the air compressor returns to normal from the surge protection state.

[0104] According to the specific situation of the air compressor, the first adjustment method or the second adjustment method can be selected respectively, or the first adjustment method and the second adjustment method can be used in combination.

[0105] Further description of this embodiment, such as Figure 4 As shown in the figure, when the air compressor is in surge state, the control steps include the following:

[0106] Setting a second correction strategy, wherein the second correction strategy increases the opening of the back pressure valve, the opening of the proportional valve, and the actual speed of the air compressor based on the first correction strategy;

[0107] Among them, the change range of the back pressure valve opening, the proportional valve opening and the actual speed of the air compressor is △ɑ2, and △ɑ2>△ɑ1;

[0108] Set the surge correction times, and the air compressor will run the second correction strategy. If the air compressor does not return to normal within the surge correction times, the air compressor will perform an emergency shutdown.

[0109] Specifically, compared with the first correction strategy, the second correction strategy increases the opening of the back pressure valve, the opening of the proportional valve and the actual speed of the air compressor. Since the intersection of the corrected inlet flow and the actual pressure ratio is on the left side of the surge line when the air compressor is in a surge state, the distance between the intersection and the working area is relatively far. Therefore, the increase amplitude △ɑ2 of the second correction strategy is greater than the amplitude △ɑ1 of the first correction strategy. In this embodiment, △ɑ2=2△ɑ1. Further explanation: since the air compressor is in a surge state (high loss state), in order to avoid excessive loss to the air compressor due to being in a surge state for a long time, the second correction strategy limits the number of surge corrections, that is, the air compressor runs the second correction strategy within the specified number of surge corrections. In this embodiment, the number of corrections is 2-4 times. If the air compressor returns to normal within the surge correction number, the air compressor continues to work. If the air compressor does not return to normal within the surge correction number, the air compressor needs to be shut down urgently to avoid further damage to the air compressor.

[0110] Further description of this embodiment, such as Figure 5 As shown in the figure, when the air compressor is in a blocked state, the control steps include the following:

[0111] A third correction strategy is set, wherein the third correction strategy includes:

[0112] Reduce the opening of the back pressure valve, increase the rear end flow resistance of the air compressor, reduce the corrected inlet flow, and / or;

[0113] Reduce the opening of the proportional valve and the actual speed of the air compressor to reduce the corrected inlet flow;

[0114] Among them, the change range of the back pressure valve opening, the proportional valve opening and the actual speed of the air compressor is △ɑ3, and △ɑ3>△ɑ2;

[0115] Set the number of blockage correction times, and the air compressor will run the third correction strategy. If the air compressor does not return to normal status within the blockage correction number, the air compressor will perform emergency shutdown.

[0116] Specifically, the third correction strategy is aimed at the air compressor in a blocked state. The third correction strategy reduces the opening of the back-pressure valve and increases the rear-end flow resistance of the air compressor, thereby reducing the corrected inlet flow rate, thereby causing the intersection of the corrected inlet flow rate and the actual pressure ratio to shift to the left, making it easier for the intersection to enter the working area, thereby returning the air compressor to normal state.

[0117] Alternatively, the corrected inlet flow rate can be reduced by decreasing the back-pressure valve opening and increasing the flow resistance at the rear end of the compressor. This shifts the intersection of the corrected inlet flow rate and the actual pressure ratio to the left, allowing the compressor to return to normal. Depending on the specific circumstances of the compressor, the two approaches in the third correction strategy can be selected individually or combined.

[0118] Further explanation, since the degree of damage to the air compressor when it is in a blocked state is much greater than the degree of damage to the air compressor when it is in a surge state, the number of blocking corrections in the third correction strategy is 1-2 times, so the change amplitude △ɑ3 of the back pressure valve opening, the proportional valve opening and the actual speed of the air compressor is greater than △ɑ2. In this embodiment, △ɑ3≥2△ɑ2, ensuring that one correction can return the air compressor from the blocked state to the normal state. If the air compressor does not return to the normal state within the number of blocking corrections, the air compressor will be shut down in an emergency.

[0119] Example 2

[0120] like Figure 6 As shown, a blocking protection line is further provided in this embodiment, and the blocking protection line is provided between the surge protection line and the blocking line. The setting of the blocking protection line adds a blocking protection state to the working state of the air compressor on the basis of Example 1. The area between the blocking protection line and the blocking line is the blocking protection zone. When the air compressor is in the blocking protection zone, the corrected inlet flow of the air compressor can be adjusted in advance so that the corrected inlet flow of the air compressor is away from the blocking line to avoid the air compressor from entering the blocking state. The setting of the blocking protection line plays a good warning role, avoiding the air compressor from entering the blocking state and causing large losses.

[0121] To further illustrate this embodiment, determining whether the air compressor is in the blocking protection state includes the following steps:

[0122] Obtaining a blocking protection flow rate and a blocking protection pressure ratio according to the blocking protection line, wherein the blocking protection pressure ratio has the same value range as the blocking standard pressure ratio;

[0123] When the actual pressure ratio, the blocking protection pressure ratio and the blocking standard pressure ratio are consistent, and the corrected inlet flow rate is less than the blocking flow rate and greater than the blocking protection flow rate, the air compressor is in a blocking protection state.

[0124] Specifically, the blocking protection pressure ratio of the blocking protection line is consistent with the value range of the blocking standard pressure ratio of the blocking line. Under the same pressure ratio, the difference between the blocking protection flow of the blocking protection line and the blocking flow of the blocking line is between 2g / s-3g / s (since the damage caused to the air compressor by the blocking state far exceeds the damage caused to the air compressor by the surge state, it is necessary to have a larger difference between the blocking protection line and the blocking line to facilitate early warning of the working status of the air compressor, so that the air compressor has more time to adjust when it is in the blocking protection state, avoiding the air compressor from entering the blocking state). When the corrected inlet flow corresponding to the actual pressure ratio is between the blocking protection flow corresponding to the blocking protection pressure ratio (the same value as the actual pressure ratio) and the blocking flow corresponding to the blocking pressure ratio (the same value as the actual pressure ratio), the intersection of the corrected inlet flow of the air compressor and the actual pressure ratio must fall into the blocking protection zone, and the air compressor is in the blocking protection state at this time.

[0125] Further explanation, such as Figure 7 As shown in the figure, when the air compressor is in the blocking protection state, the control steps include the following:

[0126] A fourth correction strategy is set, wherein the fourth correction strategy includes:

[0127] Reduce the opening of the back pressure valve, increase the rear end flow resistance of the air compressor, reduce the corrected inlet flow, and / or;

[0128] Reduce the opening of the proportional valve and the actual speed of the air compressor to reduce the corrected inlet flow;

[0129] Among them, the change range of the back pressure valve opening, the proportional valve opening and the actual speed of the air compressor is △ɑ4, and △ɑ4<△ɑ3;

[0130] The air compressor repeatedly runs the fourth correction strategy until the air compressor returns to a normal state from the blocking protection state.

[0131] Specifically, the control method of the fourth correction strategy is consistent with that of the third correction strategy. The difference is that the change amplitude of the back pressure valve opening, the proportional valve opening and the actual speed of the air compressor is reduced. At the same time, the fourth correction strategy does not need to limit the number of corrections. The air compressor can repeatedly run the fourth correction strategy until the air compressor returns to normal from the blocking protection state. Further explanation: the reason why the change amplitude of the back pressure valve, the proportional valve and the actual speed is reduced in the fourth correction strategy is because the air compressor has not yet entered the blocking state. If the adjustment amplitude is too large, the air compressor may enter the surge protection state or the surge state, resulting in the failure of the control of the fourth correction strategy, which increases the complexity of subsequent control. Therefore, the change amplitude △ɑ4 is smaller than the change amplitude △ɑ3, which gives the air compressor more correction opportunities and can be adjusted repeatedly until the air compressor returns to normal from the blocking protection state.

[0132] Example 3

[0133] In order to ensure that there is no error in the judgment of the working state of the air compressor (to improve the judgment accuracy), this embodiment also provides an air compressor working state validity judgment step, specifically as follows: Figure 8 As shown:

[0134] Calculate the corrected speed of the air compressor and obtain the standard minimum speed and standard maximum speed of the air compressor;

[0135] When the corrected speed is between the standard minimum speed and the standard maximum speed, and the air compressor maintains the current working state for more than 5 working cycles, it is determined that the current working state of the air compressor is valid;

[0136] Among them, the working cycle is 0.1s-0.5s.

[0137] Specifically, the calculation formula for the corrected speed of the air compressor is as follows:

[0138]

[0139] Among them, NcC is the corrected speed, NC is the actual speed;

[0140] The judgment of the effectiveness of the air compressor working status can better confirm the working status of the air compressor, avoid misjudgment, and facilitate the subsequent matching of different correction strategies for different air compressor working states, ensuring that the air compressor can return to normal status in a short time.

[0141] Example 4

[0142] In this embodiment, an air compressor protection system of a fuel cell system is disclosed, which is applied in the above embodiments, such as Figure 9 As shown, the system of this embodiment includes:

[0143] a collection and calculation module for collecting operating parameters of the air compressor, the operating parameters including actual inlet flow rate, inlet air temperature, inlet pressure, actual speed, and outlet pressure, and calculating the corrected inlet flow rate, actual pressure ratio, and corrected speed of the air compressor based on the collected operating parameters, thereby determining the working state of the air compressor;

[0144] The validation module is used to detect the validity of the working state of the air compressor;

[0145] Correction module, used to provide correction strategies for air compressors in surge transition state, surge protection state and blocked state;

[0146] The control module selects an appropriate correction strategy based on the data obtained by the acquisition and calculation module and imports it into the air compressor to enable the air compressor to return to normal state.

[0147] Through the cooperation between the collection and calculation module, the verification module, the correction module and the control module, the air compressor can be quickly adjusted under different working conditions, avoiding the air compressor from entering a surge state or a blocked state, reducing the loss of the air compressor and increasing the service life of the air compressor.

[0148] Each module in the above-mentioned control system (acquisition and calculation module, verification module, correction module and control module) can be embedded in or independent of the processor of the computer device in the form of hardware, or can be stored in the memory of the computer device in the form of software, so that the processor can call and execute the corresponding operations of each of the above modules.

[0149] like Figure 10 As shown, this embodiment also relates to a computer device, comprising: a memory and a processor; the memory is used to store at least one program; when the program is executed by the processor, the processor implements the control method in the above embodiment. Specifically, the computer device internally includes a bus and a processor, a memory, and a network interface respectively connected to the bus. Among them, the processor is used to provide computing and control capabilities; the memory includes a storage medium (storing an operating system, a computer program, and a database) and an internal memory (providing an environment for the operation of the operating system and the computer program); the network interface is used to connect and communicate with an external terminal.

[0150] This embodiment further provides a storage medium including a computer program, which implements the control method in the above embodiment when executed by a processor.

[0151] Although the present invention is disclosed through the above embodiments, the protection scope of the present invention is not limited thereto. Without departing from the concept of the present invention, any deformation or replacement of the above components shall fall within the scope of the claims of the present invention.

Claims

1. A fuel cell air compressor protection method, characterized in that: The steps include: Obtaining operating parameters of the air compressor, wherein the operating parameters include actual inlet flow, inlet air temperature, inlet pressure, actual speed, and outlet pressure; Calculate the corrected inlet flow and actual pressure ratio of the air compressor; A surge line, a surge protection line, a blocking protection line, and a blocking line are set for the air compressor. The surge protection pressure ratio of the surge protection line is consistent with the surge standard pressure ratio value range of the surge line. Under the same pressure ratio, the difference between the surge protection flow of the surge protection line and the surge flow of the surge line is between 1g / s and 2g / s. The blocking protection pressure ratio of the blocking protection line is consistent with the blocking standard pressure ratio value range of the blocking line. Under the same pressure ratio, the difference between the blocking protection flow of the blocking protection line and the blocking flow of the blocking line is between 2g / s and 3g / s. The working state of the air compressor is divided into surge state, surge protection state, normal state, blockage protection state and blockage state by the surge line, surge protection line, blocking protection line and blocking line; Determine the working status of the air compressor based on the corrected inlet flow and actual pressure ratio; If the air compressor is in surge protection state, the control steps include the following: A first correction strategy is set, where the first correction strategy includes: Increasing the opening of the back-pressure valve to reduce the flow resistance at the rear end of the air compressor and increase the corrected inlet flow rate, and / or increasing the opening of the proportional valve and increasing the actual speed of the air compressor to increase the corrected inlet flow rate, wherein the proportional valve is located at the front end of the air compressor; wherein the variation range of the back-pressure valve opening, the proportional valve opening, and the corrected speed of the air compressor is △ɑ1; The air compressor repeatedly runs the first correction strategy until the air compressor returns to normal state from the surge protection state; If the air compressor is in surge state, the control steps include the following: Setting a second correction strategy, wherein the second correction strategy increases the opening of the back pressure valve, the opening of the proportional valve, and the corrected speed of the air compressor based on the first correction strategy; wherein the change range of the opening of the back pressure valve, the opening of the proportional valve, and the actual speed of the air compressor is △ɑ2, and △ɑ2>△ɑ1; Set the surge correction times, and the air compressor will run the second correction strategy. If the air compressor does not return to normal within the surge correction times, the air compressor will perform an emergency shutdown. If the air compressor is in a blocked state, the control steps include the following: A third correction strategy is set, wherein the third correction strategy includes: Reduce the opening of the back pressure valve, increase the rear end flow resistance of the air compressor, reduce the corrected inlet flow, and / or; Reduce the opening of the proportional valve and the actual speed of the air compressor to reduce the corrected inlet flow rate; the change range of the back pressure valve opening, the proportional valve opening and the corrected speed of the air compressor is △ɑ3, And △ɑ3>△ɑ2; Set the number of blockage correction times, and the air compressor will run the third correction strategy. If the air compressor does not return to normal within the blockage correction number, the air compressor will perform emergency shutdown. If the air compressor is in the blocking protection state, the control steps include the following: A fourth correction strategy is set, wherein the fourth correction strategy includes: Reduce the opening of the back pressure valve, increase the rear end flow resistance of the air compressor, reduce the corrected inlet flow, and / or reduce the opening of the proportional valve and reduce the actual speed of the air compressor to reduce the corrected inlet flow; Among them, the change range of the back pressure valve opening, the proportional valve opening and the actual speed of the air compressor is △ɑ4, and △ɑ4<△ɑ3; The air compressor repeatedly runs the fourth correction strategy until the air compressor returns to a normal state from the blocking protection state.

2. A fuel cell air compressor protection method according to claim 1, characterized in that: Determining whether the air compressor is in surge state includes the following steps: Obtain surge flow and surge standard pressure ratio according to the surge line, wherein the surge flow includes a minimum surge flow and a maximum surge flow; When the corrected inlet flow rate is less than the minimum surge flow rate, the air compressor is in a surge state; When the corrected inlet flow rate is greater than the minimum surge flow rate and less than the maximum surge flow rate, and the actual pressure ratio is greater than the standard surge pressure ratio, the air compressor is in a surge state.

3. A fuel cell air compressor protection method according to claim 2, characterized in that: Determining whether the air compressor is in a blocked state includes the following steps: Obtaining the blocking flow and blocking standard pressure ratio according to the blocking line, wherein the blocking flow includes the blocking minimum flow and the blocking maximum flow; When the corrected inlet flow rate is greater than the maximum blocking flow rate, the air compressor is in a blocking state; When the corrected inlet flow rate is less than the maximum blocking flow rate and greater than the minimum blocking flow rate, and the actual pressure ratio is less than the blocking standard pressure ratio, the air compressor is in a blocking state.

4. A fuel cell air compressor protection method according to claim 3, characterized in that: Determining whether the air compressor is in surge protection state includes the following steps: Obtaining a surge protection flow rate and a surge protection pressure ratio according to the surge protection line, wherein the surge protection pressure ratio has a value range consistent with the surge standard pressure ratio; When the actual pressure ratio, the surge protection pressure ratio and the surge standard pressure ratio are consistent, and the corrected inlet flow rate is greater than the surge flow rate and less than the surge protection flow rate, the air compressor is in a surge protection state.

5. A fuel cell air compressor protection method according to claim 4, characterized in that: Judging the effectiveness of the working status of the air compressor includes the following steps: Calculate the corrected speed of the air compressor and obtain the standard minimum speed and standard maximum speed of the air compressor; When the corrected speed is between the standard minimum speed and the standard maximum speed, and the air compressor maintains the current working state for more than 5 working cycles, it is determined that the current working state of the air compressor is valid; Among them, the working cycle is 0.1s-0.5s.

6. A fuel cell air compressor protection system, applied to the protection method according to any one of claims 1 to 5, characterized in that: include: a collection and calculation module for collecting operating parameters of the air compressor, the operating parameters including actual inlet flow rate, inlet air temperature, inlet pressure, actual speed, and outlet pressure, and calculating the corrected inlet flow rate, actual pressure ratio, and corrected speed of the air compressor based on the collected operating parameters, thereby determining the working state of the air compressor; The validation module is used to detect the validity of the working state of the air compressor; A correction module is used to provide correction strategies for the air compressor in surge state, surge protection state, blocking protection state and blocking state; The control module selects an appropriate correction strategy based on the data obtained by the acquisition and calculation module and imports it into the air compressor to enable the air compressor to return to normal state.

7. A computer device, characterized in that: include: memory and processor; The memory is used to store at least one program; When the program is executed by a processor, the processor implements the fuel cell air compressor protection method according to any one of claims 1 to 5.

8. A storage medium comprising a computer program, characterized in that: When the computer program is executed by a processor, the fuel cell air compressor protection method according to any one of claims 1 to 5 is implemented.

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