Start-up control system for parallel compressors

Abstract

The present invention provides a startup control system for parallel compressors. The startup control system for parallel compressors includes: an input response module, a compressor parameter input module, a data storage module, a control signal generation module, a compressor control module, an exhaust detection module and a display terminal. The present invention generates a compressor control signal according to the refrigeration capacity input by the user and the parameters corresponding to the single compressor, uniformly adjusts the output frequency of all the single compressors to adjust the refrigeration capacity of the parallel compressors, reduces the number of starts and stops of the single compressor, and prolongs the service life of the parallel compressors.

Description

Technical Field

[0001] The present invention relates to the field of mechanical control, and more particularly to a start-up control system for parallel compressors. Background Art

[0002] Parallel compressors are a type of equipment that connects multiple compressors in parallel to achieve a wide range of cooling capacity control. Since multiple compressors are in parallel, when one compressor fails, it will not affect the use of the entire system. Existing parallel compressors generally control cooling capacity by shutting down or starting individual compressors one by one, but this type of control method will cause a single compressor to start and stop multiple times, affecting the life of the parallel compressor. Summary of the invention

[0003] The present invention provides a start-up control system for parallel compressors, which reduces the number of starts and stops of individual compressors by adjusting the output frequencies of all individual compressors according to the refrigeration capacity;

[0004] In order to realize the above technical solution, the present invention provides a startup control system for parallel compressors, comprising:

[0005] An input response module is used to obtain the cooling capacity input by the user;

[0006] A compressor parameter input module is used to input parameters corresponding to a single compressor, and the parameters corresponding to the compressor include output frequency and its corresponding cooling capacity;

[0007] A data storage module, used to store the cooling capacity input by the user and the parameters corresponding to a single compressor;

[0008] A control signal generating module, used to generate a compressor control signal according to the cooling capacity input by the user and the parameters corresponding to a single compressor;

[0009] A compressor control module, used for controlling a corresponding compressor according to a compressor control signal;

[0010] Exhaust detection module, used to detect whether the compressor is working normally;

[0011] Display terminal, used to display fault information.

[0012] As a preferred aspect, the startup control of the parallel compressors includes the following steps:

[0013] S1: Get the input cooling capacity Q1;

[0014] S2: Obtain the output frequency f(i) of a single compressor in the parallel compressors and its corresponding cooling capacity q(i, j), where i=1, 2, 3...I, I is the number of all output frequency parameters of a single compressor, j=1, 2, 3...J, j is the number of a single compressor, and J is the total number of all single compressors in the parallel compressors;

[0015] S3: Let k = 1, k is used to record the selected output frequency;

[0016] S4: Calculate the theoretical cooling capacity Q2(k), Calculate the first cooling capacity difference δ(k), δ(k)=|Q2(k)-Q1|;

[0017] S5: Determine whether "k≤I" holds. If so, assign k+1 to k and return to S4. If not, go to S6.

[0018] S6: Bubble sort all δ(k) in ascending order, select the first value, record it as δmin, and record the corresponding k value, record it as k_min;

[0019] S7: Determine whether "δmin≤ψ" holds, where ψ is the cooling capacity difference threshold. If "δmin≤ψ" holds, generate a compressor control signal, which includes the unified output frequency f(k_min) of all individual compressors, and enter S13; if "δmin≤ψ" does not hold, enter S8;

[0020] S8: Let m=1, where m is used to record the selected single compressor;

[0021] S9: Calculate the second cooling capacity difference φ(m), φ(m)=|δmin-q(k_min,m)|;

[0022] S10: Determine whether "m≤J" is true. If "m≤J" is true, assign m+1 to m and return to S9; if "m≤J" is not true, enter S11;

[0023] S11: Bubble sort all φ(m) in the order of arrival from the smallest, select the first value, record it as φmin, and record the corresponding m value, record it as m_min;

[0024] S12: Generate a compressor control signal, the compressor control signal includes a unified output frequency f(k_min) of all individual compressors and closes the compressor corresponding to m_min;

[0025] S13: Control the corresponding compressor according to the compressor control signal.

[0026] As a preferred aspect, before the start control of the parallel compressors, it also includes pre-starting the parallel compressors, and the specific steps are as follows:

[0027] T1: Generates compressor control signal with set output frequency f_set;

[0028] T2: Control the output frequency of the corresponding compressor according to the compressor control signal and start the parallel compressor;

[0029] T3: Let x=1, x is used to record the selected single compressor;

[0030] T3: Obtain the exhaust volume p(x) corresponding to a single compressor;

[0031] T4: Determine whether "p(x)≤P" is true, P is the preset value of the exhaust volume. If "p(x)≤P" is true, enter T5; if "p(x)≤P" is not true, enter T6;

[0032] T5: Display on the display terminal: x corresponds to a single compressor failure, and the value of x is stored in the set ζ, and enter T6;

[0033] T6: assign x+1 to x;

[0034] T7: Determine whether "x≤J" is true. If so, return to T3; if not, proceed to T8.

[0035] T8: Let y=1, y is used to traverse the serial numbers of all single compressors;

[0036] T9: traverse the set ζ and match it with y. If the match is successful, shield the parameters of y corresponding to a single compressor; if the match fails, enter T10;

[0037] T10: assign y+1 to y;

[0038] T11: Determine whether "y≤J" is true. If so, return to T9; if not, go to T12.

[0039] T12: Reorder and renumber all unmasked individual compressor parameters.

[0040] As a preferred aspect, it also includes an information archiving module, which is used for information archiving and information uploading of the compressor control signal;

[0041] A cloud server, the cloud server is used to store the compressor control signal according to the result of the information archiving module;

[0042] In steps S7 and S12, when the compressor control signal is generated, the information archiving module archives the cooling capacity, the output frequency of a single compressor in the parallel compressors and its corresponding cooling capacity and the corresponding compressor control signal to form a control document, and uploads it to the cloud server;

[0043] When starting the parallel compressors, the cloud server obtains the cooling capacity inside the data storage module and the corresponding parameters of a single compressor through the built-in interface, and matches them with the control document. If the match is successful, the cloud server directly sends the compressor control signal to the compressor control module; if the match fails, the cloud server does not respond.

[0044] As a preferred aspect, it also includes a power monitoring module for detecting the operating power of the parallel compressors;

[0045] After starting the parallel compressor, the operating power w corresponding to the parallel compressor is obtained through the power monitoring module to determine whether "w≤W" is established, where W is the rated power corresponding to the parallel compressor. If "w≤W" is established, the operating power w corresponding to the parallel compressor is obtained; if "w≤W" is not established, the parallel compressor is controlled to be shut down through the compressor control module.

[0046] As a preferred aspect, the cloud server and the data storage module are connected via a wireless protocol.

[0047] As a preferred aspect, it also includes a history record module, which is used to record the cooling capacity and the corresponding compressor control signal when the parallel compressors remain unchanged, and generate historical record data;

[0048] The data storage module is also used to store historical record data;

[0049] A historical data matching module is used to match the cooling capacity input by the user with the cooling capacity in the historical record data, and send a compressor control signal corresponding to the successfully matched cooling capacity to the compressor control module according to the matching result;

[0050] In steps S7 and S12, a compressor control signal is generated, and a history record module generates history record data according to the cooling capacity and the corresponding compressor control signal;

[0051] When the parameters corresponding to a single compressor corresponding to the parallel compressors have not changed, the historical record data is retained. When the parallel compressors are started, if the cooling capacity matches the cooling capacity in the historical record data, the historical data matching module sends the compressor control signal corresponding to the successfully matched cooling capacity to the compressor control module to control the start of the parallel compressors.

[0052] When the parameters corresponding to a single compressor corresponding to the parallel compressors have not changed, the historical record data in the data storage module is cleared.

[0053] As a preferred aspect, it also includes a fault statistics module, which is used to count the fault information of a single compressor corresponding to the parallel compressors;

[0054] Statistics of fault information of a single compressor corresponding to the parallel compressors specifically include the following steps: each time a set ζ is generated, the set ζ is input into a fault statistics module, the fault statistics module counts the frequency r of occurrence of the corresponding serial number of all single compressors within the set ζ, and determines whether "r≤R" is established, where R is the fault frequency threshold. If "r≤R" is established, no operation is performed; if "r≤R" is established, the display terminal displays that the number of faults of the single compressor corresponding to r is too large, and a reminder is given to replace it.

[0055] The present invention has the following advantages:

[0056] 1. The present invention generates a compressor control signal according to the refrigeration capacity input by the user and the parameters corresponding to the single compressor, uniformly adjusts the output frequency of all the single compressors to adjust the refrigeration capacity of the parallel compressors, reduces the start and stop times of the single compressor, and prolongs the service life of the parallel compressors.

[0057] 2. The present invention pre-starts the parallel compressors, and while detecting the failure of a single compressor, it can also re-adjust the parameters of the single compressor so that the subsequent start of the parallel compressors is not affected, thereby avoiding the failure of a single compressor affecting the start of the parallel compressors.

[0058] 3. The present invention matches the parameters corresponding to the refrigeration capacity and a single compressor with the control document, so that when the refrigeration capacity input and the parameters of a single compressor are consistent, the compressor control signal can be sent directly, saving calculation time and improving the response speed of the system.

[0059] 4. The present invention monitors the operating power of the parallel compressors to avoid danger caused by power overload of the parallel compressors.

[0060] 5. The present invention records historical data. When the parameters of a single compressor remain unchanged, that is, when the parallel compressors are not adjusted, the compressor control signal can be quickly obtained through the cooling capacity input by the user, thereby improving the response speed of the system and the operability of the system.

[0061] 6. The present invention can reduce the probability of failure of parallel compressors by allowing all single compressors to operate at the same output frequency. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] Figure 1It is a structural schematic diagram of the start-up control system of the parallel compressors adopted in the present invention.

[0063] Figure 2 The figure is a flow chart of the startup control of parallel compressors according to the present invention.

[0064] Figure 3 It is a schematic diagram of the process of pre-starting parallel compressors according to the present invention.

[0065] Figure 4 It is a structural diagram of the information archiving module and cloud server of the present invention.

[0066] Figure 5 It is a structural schematic diagram of the power monitoring module of the present invention.

[0067] Figure 6 It is a schematic diagram of the structure of the historical record module and the historical data matching module of the present invention.

[0068] Figure 7 It is a structural schematic diagram of the fault statistics module of the present invention. DETAILED DESCRIPTION

[0069] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0070] Example 1

[0071] Start-up control system for parallel compressors, such as Figure 1 As shown, including:

[0072] The input response module is used to obtain the cooling capacity input by the user. The user can input the cooling capacity required for the corresponding area manually or by data import through the input response module;

[0073] The compressor parameter input module is used to input the parameters corresponding to a single compressor. The parameters corresponding to the compressor include the output frequency and its corresponding cooling capacity. The parameters corresponding to a single compressor are determined by the specifications of the single compressor and the manufacturer. Users can input them manually or by data import;

[0074] A data storage module is used to store the cooling capacity input by the user and the parameters corresponding to a single compressor. The data storage module uses MySQL;

[0075] A control signal generating module, used to generate a compressor control signal according to the cooling capacity input by the user and the parameters corresponding to the single compressor, wherein the compressor control signal controls the cooling capacity of the corresponding single compressor by changing the output frequency corresponding to the compressor;

[0076] A compressor control module, used for controlling a corresponding compressor according to a compressor control signal;

[0077] Exhaust detection module, used to detect whether the compressor is working normally;

[0078] Display terminal, used to display fault information.

[0079] like Figure 2 As shown, the start-up control of the parallel compressors includes the following steps:

[0080] S1: Get the input cooling capacity Q1;

[0081] S2: Obtain the output frequency f(i) of a single compressor in the parallel compressors and its corresponding cooling capacity q(i, j), where i=1, 2, 3...I, I is the number of all output frequency parameters of a single compressor, j=1, 2, 3...J, j is the number of a single compressor, and J is the total number of all single compressors in the parallel compressors;

[0082] S3: Let k = 1, k is used to record the selected output frequency and is also used to traverse all the selectable output frequencies;

[0083] S4: Calculate the theoretical cooling capacity Q2(k), The theoretical cooling capacity Q2(k) refers to the cooling capacity generated by all single compressors operating at the same frequency under the selected output frequency. The first cooling capacity difference δ(k) is calculated. δ(k)=|Q2(k)-Q1|. The first cooling capacity difference δ(k) refers to the difference between the theoretical cooling capacity Q2(k) and the cooling capacity Q1 input by the user.

[0084] By running all individual compressors at the same output frequency, the probability of failure of paralleled compressors can be reduced.

[0085] S5: Determine whether "k≤I" is true. If "k≤I" is true, assign k+1 to k to implement the traversal of the output frequency and return to S4; if "k≤I" is not true, enter S6;

[0086] S6: Bubble sort all δ(k) in ascending order, select the first value, record it as δmin, and record the corresponding k value, record it as k_min;

[0087] S7: Determine whether "δmin≤ψ" holds, where ψ is the cooling capacity difference threshold. If "δmin≤ψ" holds, it means that the difference between the theoretical cooling capacity Q2(k) and the cooling capacity Q1 input by the user is within an acceptable range, and a compressor control signal is generated. The compressor control signal includes a unified output frequency f(k_min) of all individual compressors, and enters S13; if "δmin≤ψ" does not hold, it means that the difference between the theoretical cooling capacity Q2(k) and the cooling capacity Q1 input by the user exceeds the acceptable range, and enters S8;

[0088] S8: Let m=1, where m is used to record the selected single compressor;

[0089] S9: Calculate the second cooling capacity difference φ(m), φ(m)=|δmin-q(k_min, m)|, the second cooling capacity difference φ(m) refers to the difference between the first cooling capacity difference δ(k) and the cooling capacity of a single compressor q(k_min, m)|;

[0090] S10: Determine whether "m≤J" is true. If "m≤J" is true, assign m+1 to m and return to S9; if "m≤J" is not true, enter S11;

[0091] S11: Bubble sort all φ(m) in the order of arrival from the smallest, select the first value, record it as φmin, and record the corresponding m value, record it as m_min. At this time, it means that the single compressor corresponding to m can best offset the first cooling capacity difference δ(k);

[0092] S12: Generate a compressor control signal, the compressor control signal includes a unified output frequency f(k_min) of all individual compressors and closes the compressor corresponding to m_min;

[0093] S13: Control the corresponding compressor according to the compressor control signal.

[0094] The present invention generates a compressor control signal according to the cooling capacity input by the user and the parameters corresponding to the single compressor, uniformly adjusts the output frequencies of all the single compressors to adjust the cooling capacity of the parallel compressors, reduces the start and stop times of the single compressor, and prolongs the service life of the parallel compressors.

[0095] like Figure 3 As shown, before the start control of the parallel compressors, the parallel compressors are also pre-started, and the specific steps are as follows:

[0096] T1: Generate a compressor control signal with a set output frequency f_set, and the set output frequency f_set is manually operated by an operator;

[0097] T2: Control the output frequency of the corresponding compressor according to the compressor control signal and start the parallel compressor;

[0098] T3: Let x=1, x is used to record the selected single compressor;

[0099] T3: Obtain the exhaust volume p(x) corresponding to a single compressor;

[0100] T4: Determine whether "p(x)≤P" is true, P is the preset value of the exhaust volume. If "p(x)≤P" is true, enter T5; if "p(x)≤P" is not true, it means that the corresponding single compressor has a fault, and enter T6;

[0101] T5: Display on the display terminal: x corresponds to a single compressor failure, and store the value of x in the set ζ, and enter T6;

[0102] T6: assign x+1 to x;

[0103] T7: Determine whether "x≤J" is true. If so, return to T3; if not, proceed to T8.

[0104] T8: Let y=1, y is used to traverse the serial numbers of all single compressors;

[0105] T9: traverse the set ζ and match it with y. If the match is successful, shield the parameters of y corresponding to a single compressor; if the match fails, enter T10;

[0106] T10: assign y+1 to y;

[0107] T11: Determine whether "y≤J" is true. If so, return to T9; if not, go to T12.

[0108] T12: Reorder and renumber all unmasked individual compressor parameters.

[0109] The present invention pre-starts the parallel compressors and can re-adjust the parameters of the single compressor while detecting the fault of a single compressor, so that the subsequent start of the parallel compressors is not affected, thereby avoiding the fault of a single compressor affecting the start of the parallel compressors.

[0110] like Figure 4 As shown, it also includes an information archiving module, which is used for information archiving and information uploading of compressor control signals;

[0111] A cloud server, the cloud server is used to store the compressor control signal according to the result of the information archiving module, and the cloud server and the data storage module are connected via a wireless protocol;

[0112] In steps S7 and S12, when the compressor control signal is generated, the information archiving module archives the cooling capacity, the output frequency of a single compressor in the parallel compressors and its corresponding cooling capacity and the corresponding compressor control signal to form a control document, and uploads it to the cloud server;

[0113] When starting the parallel compressors, the cloud server obtains the cooling capacity inside the data storage module and the corresponding parameters of a single compressor through the built-in interface, and matches them with the control document. If the match is successful, the cloud server directly sends the compressor control signal to the compressor control module; if the match fails, the cloud server does not respond.

[0114] The present invention matches the parameters corresponding to the refrigeration capacity and a single compressor with the control document, so that when the refrigeration capacity input and the parameters of a single compressor are consistent, the compressor control signal can be directly sent, saving calculation time and improving the response speed of the system.

[0115] like Figure 5 As shown, it also includes a power monitoring module for detecting the operating power of the parallel compressors;

[0116] After starting the parallel compressor, the operating power w corresponding to the parallel compressor is obtained through the power monitoring module to determine whether "w≤W" is established, where W is the rated power corresponding to the parallel compressor. If "w≤W" is established, the operating power w corresponding to the parallel compressor is obtained; if "w≤W" is not established, the parallel compressor is controlled to be shut down through the compressor control module.

[0117] The present invention monitors the operating power of the parallel compressors to avoid danger caused by power overload of the parallel compressors.

[0118] like Figure 6 As shown, it also includes a history record module, which is used to record the cooling capacity and its corresponding compressor control signal when the parallel compressors remain unchanged, and generate historical record data;

[0119] The data storage module is also used to store historical record data;

[0120] A historical data matching module is used to match the cooling capacity input by the user with the cooling capacity in the historical record data, and send a compressor control signal corresponding to the successfully matched cooling capacity to the compressor control module according to the matching result;

[0121] In steps S7 and S12, a compressor control signal is generated, and a history record module generates history record data according to the cooling capacity and the corresponding compressor control signal;

[0122] When the parameters corresponding to a single compressor corresponding to the parallel compressors have not changed, the historical record data is retained. When the parallel compressors are started, if the cooling capacity matches the cooling capacity in the historical record data, the historical data matching module sends the compressor control signal corresponding to the successfully matched cooling capacity to the compressor control module to control the start of the parallel compressors.

[0123] When the parameters corresponding to a single compressor corresponding to the parallel compressors have not changed, the historical record data in the data storage module is cleared.

[0124] The present invention records historical data. When the parameters of a single compressor remain unchanged, that is, when the parallel compressors are not adjusted, the compressor control signal can be quickly obtained through the cooling capacity input by the user, thereby improving the response speed of the system and the operability of the system.

[0125] like Figure 7 As shown, it also includes a fault statistics module, which is used to count the fault information of a single compressor corresponding to the parallel compressors;

[0126] Statistics of fault information of a single compressor corresponding to the parallel compressors specifically include the following steps: each time a set ζ is generated, the set ζ is input into a fault statistics module, the fault statistics module counts the frequency r of occurrence of the corresponding serial number of all single compressors within the set ζ, and determines whether "r≤R" is established, where R is the fault frequency threshold. If "r≤R" is established, no operation is performed; if "r≤R" is established, the display terminal displays that the number of faults of the single compressor corresponding to r is too large, and a reminder is given to replace it.

[0127] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all such improvements and changes should fall within the scope of protection of the appended claims of the present invention. Parts not described in detail in this specification belong to the prior art known to those skilled in the art.

Claims

1. Start-up control system for parallel compressors, It is characterized in that include: An input response module is used to obtain the cooling capacity input by the user; A compressor parameter input module is used to input parameters corresponding to a single compressor, and the parameters corresponding to the compressor include output frequency and its corresponding cooling capacity; A data storage module, used to store the cooling capacity input by the user and the parameters corresponding to a single compressor; A control signal generating module, used to generate a compressor control signal according to the cooling capacity input by the user and the parameters corresponding to a single compressor; A compressor control module, used for controlling a corresponding compressor according to a compressor control signal; Exhaust detection module, used to detect whether the compressor is working normally; Display terminal, used to display fault information; The start-up control of parallel compressors includes the following steps: S1: Get the input cooling capacity Q1; S2: Obtain the output frequency f(i) of a single compressor in the parallel compressors and its corresponding cooling capacity q(i, j), where i=1, 2, 3...I, I is the number of all output frequency parameters of a single compressor, j=1, 2, 3...J, j is the number of a single compressor, and J is the total number of all single compressors in the parallel compressors; S3: Let k = 1, k is used to record the selected output frequency; S4: Calculate the theoretical cooling capacity Q2(k), Calculate the first cooling capacity difference δ(k), δ(k)=|Q2(k)-Q1|; S5: Determine whether "k≤I" holds. If so, assign k+1 to k and return to S4. If not, go to S6. S6: Bubble sort all δ(k) in ascending order, select the first value, record it as δmin, and record the corresponding k value, record it as k_min; S7: Determine whether "δmin≤ψ" holds, where ψ is the cooling capacity difference threshold. If "δmin≤ψ" holds, generate a compressor control signal, which includes the unified output frequency f(k_min) of all individual compressors, and enter S13; if "δmin≤ψ" does not hold, enter S8; S8: Let m=1, where m is used to record the selected single compressor; S9: Calculate the second cooling capacity difference φ(m), φ(m)=|δmin-q(k_min,m)|; S10: Determine whether "m≤J" holds. If so, assign m+1 to m and return to S9; if not, enter S11. S11: Bubble sort all φ(m) in the order of arrival from the smallest, select the first value, record it as φmin, and record the corresponding m value, record it as m_min; S12: Generate a compressor control signal, the compressor control signal includes a unified output frequency f(k_min) of all individual compressors and closes the compressor corresponding to m_min; S13: Controlling the corresponding compressor according to the compressor control signal; It also includes an information archiving module for information archiving and information uploading of compressor control signals; A cloud server, the cloud server is used to store the compressor control signal according to the result of the information archiving module; In steps S7 and S12, when the compressor control signal is generated, the information archiving module archives the cooling capacity, the output frequency of a single compressor in the parallel compressors and its corresponding cooling capacity and the corresponding compressor control signal to form a control document, and uploads it to the cloud server; When starting the parallel compressor, the cloud server obtains the cooling capacity and the corresponding parameters of a single compressor in the data storage module through the built-in interface, and matches them with the control document. If the match is successful, the cloud server directly sends the compressor control signal to the compressor control module; if the match fails, the cloud server does not respond; Also included is a power monitoring module for detecting the operating power of the parallel compressors; After starting the parallel compressor, the operating power w corresponding to the parallel compressor is obtained through the power monitoring module to determine whether "w≤W" is established, where W is the rated power corresponding to the parallel compressor. If "w≤W" is established, the operating power w corresponding to the parallel compressor is obtained; if "w≤W" is not established, the parallel compressor is controlled to be shut down through the compressor control module.

2. The startup control system of the parallel compressors according to claim 1, It is characterized in that Before starting the parallel compressors, the parallel compressors are also pre-started. The specific steps are as follows: T1: Generates compressor control signal with set output frequency f_set; T2: Control the output frequency of the corresponding compressor according to the compressor control signal and start the parallel compressor; T3: Let x=1, x is used to record the selected single compressor; T3: Obtain the exhaust volume p(x) corresponding to a single compressor; T4: Determine whether "p(x)≤P" is true, P is the preset value of the exhaust volume. If "p(x)≤P" is true, enter T5; if "p(x)≤P" is not true, enter T6; T5: Display on the display terminal: x corresponds to a single compressor failure, and the value of x is stored in the set ζ, and enter T6; T6: assign x+1 to x; T7: Determine whether "x≤J" is true. If so, return to T3; if not, proceed to T8. T8: Let y=1, y is used to traverse the serial numbers of all single compressors; T9: traverse the set ζ and match it with y. If the match is successful, shield the parameters of y corresponding to a single compressor; if the match fails, enter T10; T10: assign y+1 to y; T11: Determine whether "y≤J" is true. If so, return to T9; if not, go to T12. T12: Reorder and renumber all unmasked individual compressor parameters.

3. The startup control system of the parallel compressors according to claim 2, It is characterized in that The cloud server and the data storage module are connected via wireless protocol.

4. The startup control system of the parallel compressors according to claim 3, It is characterized in that It also includes a history record module, which is used to record the cooling capacity and the corresponding compressor control signal when the parallel compressors remain unchanged, and generate historical record data; The data storage module is also used to store historical record data; A historical data matching module is used to match the cooling capacity input by the user with the cooling capacity in the historical record data, and send a compressor control signal corresponding to the successfully matched cooling capacity to the compressor control module according to the matching result; In steps S7 and S12, a compressor control signal is generated, and a history record module generates history record data according to the cooling capacity and the corresponding compressor control signal; When the parameters corresponding to a single compressor corresponding to the parallel compressors have not changed, the historical record data is retained. When the parallel compressors are started, if the cooling capacity matches the cooling capacity in the historical record data, the historical data matching module sends the compressor control signal corresponding to the successfully matched cooling capacity to the compressor control module to control the start of the parallel compressors. When the parameters corresponding to a single compressor corresponding to the parallel compressors have not changed, the historical record data in the data storage module is cleared.

5. The startup control system of parallel compressors according to claim 4, It is characterized in that It also includes a fault statistics module for counting fault information of a single compressor corresponding to the parallel compressors; The specific steps of collecting the fault information of a single compressor corresponding to the parallel compressors include: Each time when the set ζ is generated, the set ζ is input into the fault statistics module. The fault statistics module counts the frequency r of the corresponding number of all the individual compressors in the set ζ, and determines whether "r≤R" is established. R is the fault frequency threshold. If "r≤R" is established, no operation is performed; if "r≤R" is established, the display terminal displays that the number of failures of the individual compressor corresponding to r is too large, and a reminder is given to replace it.

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