New energy electromechanical equipment energy efficiency monitoring management method and system

Abstract

The invention relates to the technical field of frequency converter control cabinets, and discloses an electromechanical equipment energy efficiency monitoring management method and system for new energy, and the method comprises the following steps: setting the working voltage and working frequency of the output end of a frequency converter control cabinet of a plurality of energy levels, standard gas flows of output ends of a compressor, a condenser and an evaporator in the vehicle-mounted air conditioning equipment corresponding to each energy level and standard gas temperatures of the output ends of the condenser and the evaporator are set; according to the new energy electromechanical equipment energy efficiency monitoring management method and system, the working voltage and the working frequency of the output end of a frequency converter control cabinet, the gas flow of the output ends of a compressor, a condenser and an evaporator in vehicle-mounted air conditioning equipment and the gas temperature of the output ends of the condenser and the evaporator are monitored in real time; the problems of data acquisition devices in the vehicle-mounted air conditioning equipment and the frequency converter control cabinet and running parts in the vehicle-mounted air conditioning equipment can be accurately traced, and control and management of the energy efficiency of the vehicle-mounted air conditioning equipment are facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of frequency converter control cabinets, and in particular to a method and system for monitoring and managing energy efficiency of electromechanical equipment for new energy use. Background Art

[0002] New energy vehicles refer to vehicles that use unconventional automotive fuels as their power source. Existing new energy vehicles mostly use electricity as their power source. The electromechanical equipment in electric vehicles includes the drive system that drives the vehicle and the operating equipment of various auxiliary functions inside the vehicle. The on-board air-conditioning equipment is one of them, and it is also one of the electromechanical equipment with higher energy consumption in electric vehicles. The on-board air-conditioning equipment is used in conjunction with the inverter control cabinet. The inverter control cabinet can be used to reasonably adjust the working frequency of the on-board air-conditioning equipment to reduce the energy consumption of the on-board air-conditioning equipment.

[0003] When the frequency converter control cabinet is used to perform frequency modulation control on the operation of the vehicle air-conditioning equipment, the gas flow rate and the temperature data generated inside the vehicle air-conditioning equipment will be collected as parameter information for the operation of the vehicle air-conditioning equipment. However, the traditional frequency converter control cabinet can only perform intelligent frequency modulation on the vehicle air-conditioning equipment and monitor the working conditions of the main operating components in the vehicle air-conditioning equipment based on the collected data. It is unable to accurately trace the data collection devices in the vehicle air-conditioning equipment and the frequency converter control cabinet and the problems in the operating components of the vehicle air-conditioning equipment, which is not conducive to timely maintenance and processing of problems in the vehicle air-conditioning equipment, and is not conducive to control and management of the energy efficiency of the vehicle air-conditioning equipment. Summary of the invention

[0004] In order to solve the problem that the traditional inverter control cabinet for vehicle air-conditioning equipment cannot accurately trace the data collection devices in the vehicle air-conditioning equipment and the inverter control cabinet and the problems existing in the running parts of the vehicle air-conditioning equipment, which is not conducive to timely maintenance and processing of the problems existing in the vehicle air-conditioning equipment, and is not conducive to controlling and managing the energy efficiency of the vehicle air-conditioning equipment, the present invention is implemented through the following technical solutions: A method for monitoring and managing the energy efficiency of electromechanical equipment for new energy, comprising the following steps:

[0005] S1. Set the operating voltage and operating frequency of the output end of the inverter control cabinet of multiple energy levels, and set the standard gas flow rate of the compressor, condenser and evaporator output ends and the standard gas temperature of the condenser and evaporator output ends in the vehicle air-conditioning equipment corresponding to each energy level;

[0006] S2, real-time monitoring of the operating voltage and operating frequency at the output end of the inverter control cabinet;

[0007] S3, real-time monitoring of the gas flow at the compressor output end, the condenser output end and the evaporator output end of the vehicle air-conditioning equipment, and the gas temperature at the condenser output end and the evaporator output end;

[0008] S4, comparing the real-time monitored gas flow and gas temperature with the standard gas flow and gas temperature of the corresponding energy level, and judging whether the real-time monitored gas flow and gas temperature match the real-time monitored working voltage and working frequency of the corresponding energy level. If they match, the frequency converter control cabinet is continuously used to perform frequency modulation control on the operation of the vehicle air-conditioning equipment. At this time, the operation state of the vehicle air-conditioning equipment is normal. If they do not match, execute S5;

[0009] S5. According to the real-time monitored gas flow and gas temperature, determine the abnormal gas flow or gas temperature at the output end, that is, the gas flow at one or more output ends of the compressor, condenser and evaporator is abnormal, and the gas temperature at one or two output ends of the condenser and evaporator is abnormal, and determine that the abnormal gas flow or gas temperature exceeds the standard or does not meet the standard;

[0010] Gas flow anomaly refers to the fact that the real-time monitored gas flow is different from the standard gas flow of the corresponding energy level, and gas temperature anomaly refers to the fact that the real-time monitored gas temperature is different from the standard gas temperature of the corresponding energy level.

[0011] S6. Detect the current signals of each phase at the output end of the inverter control cabinet and calculate the effective value of each phase current. The calculation of the effective value of each phase current is:

[0012]

[0013]

[0014] Among them, I x ,I y ,I z are the effective values ​​of the three-phase currents x, y and z respectively, ix, iy and iz are the three-phase currents x, y and z at the output end of the inverter respectively, and t and T are both time;

[0015] If the effective value of each phase current is less than the set current of the vehicle air conditioning device of the corresponding energy level, and the abnormal gas flow or gas temperature exceeds the standard, it is determined that there is a problem with the device used to detect the current signal of each phase or the device used to monitor the abnormal gas flow or gas temperature in real time;

[0016] S7. If the effective value of each phase current is greater than the set current of the vehicle air-conditioning equipment of the corresponding energy level, and the abnormal gas flow or gas temperature does not meet the standard, it is determined that there is a problem with the operating components in the vehicle air-conditioning equipment, and the operating components include the compressor, condenser and evaporator.

[0017] Furthermore, S6 also includes:

[0018] If the effective value of each phase current is less than the set current of the vehicle air-conditioning equipment, and the abnormal gas flow or gas temperature does not meet the standard, it means that the working voltage and working frequency at this time are too low, and the frequency converter control cabinet should be used to increase the working voltage and working frequency; if the effective value of each phase current is greater than the set current of the vehicle air-conditioning equipment, and the abnormal gas flow or gas temperature exceeds the standard, it means that the working voltage and working frequency at this time are too high, and the frequency converter control cabinet should be used to lower the working voltage and working frequency.

[0019] Furthermore, the specific method for determining in S6 whether there is a problem with the device for detecting the current signals of each phase includes:

[0020] If the effective value of each phase current is less than the set current of the vehicle air-conditioning equipment of the corresponding energy level, and the gas flow at the compressor output end, the condenser output end and the evaporator output end or the gas temperature at the condenser output end and the evaporator output end exceeds the standard, and all abnormal gas flow rates or gas temperatures can match the operating voltage and operating frequency of other energy levels, this situation indicates that the compressor, condenser and evaporator are operating normally, and the real-time monitoring devices at the corresponding output ends are operating normally, and it is determined that there is a problem with the device used to detect the current signals of each phase.

[0021] Furthermore, the specific method for determining in S6 that there is a problem with the device for real-time monitoring of abnormal gas flow or gas temperature includes:

[0022] Along the gas transmission direction, when abnormal gas flow or gas temperature occurs, if the detection result of the device corresponding to the abnormal gas flow or gas temperature and the next device of the same type do not meet the transmission loss standard of the gas flow or gas temperature, it is determined that there is a problem with the device corresponding to the abnormal gas flow or gas temperature; the gas flow loss standard refers to the loss of flow velocity in each flow stage when the gas flows normally between the compressor, condenser and evaporator, and the gas temperature loss standard is the heat consumption generated during normal flow between the condenser and the evaporator.

[0023] Furthermore, the specific method for determining whether there is a problem with the operating components of the vehicle air conditioning device in S7 includes:

[0024] Along the gas transmission direction, when abnormal gas flow or gas temperature occurs, if the detection result of the device corresponding to the abnormal gas flow or gas temperature and the next device of the same type meet the transmission loss standard of the gas flow or gas temperature, it is determined that there is a problem with the operating component corresponding to the abnormal gas flow or gas temperature.

[0025] Furthermore, the specific method for determining whether there is a problem with the operating components of the vehicle air conditioning device in S7 also includes:

[0026] If the effective value of each phase current is greater than the set current of the vehicle air-conditioning equipment of the corresponding energy level, and the gas flow at the compressor output, condenser output and evaporator output or the gas temperature at the condenser output and evaporator output are not up to standard, and all abnormal gas flow or gas temperature can match the operating voltage and operating frequency of other energy levels, it is determined that there are problems with other operating components in the vehicle air-conditioning equipment except the compressor, condenser and evaporator.

[0027] Other operating parts include filters and fans.

[0028] Furthermore, the method for determining whether the inverter output terminal in the inverter control cabinet operates normally includes:

[0029] Calculate the phase difference of each phase current at the inverter output end, and determine whether the phase difference of the three-phase currents x, y, and z is 120°. If the phase difference of the three-phase current is not 120°, it is determined that the inverter output end in the inverter control cabinet is abnormal. The phase angle of each phase current at the inverter output end is:

[0030]

[0031] in, are the phase angles of the three-phase currents x, y, and z respectively. Therefore, the phase differences of the currents of each phase are:

[0032] k is a constant and f is the frequency.

[0033] A new energy electromechanical equipment energy efficiency monitoring and management system includes a data acquisition system and a data analysis system. The data acquisition system includes:

[0034] Voltage and frequency acquisition module, used to monitor the working voltage and frequency at the output end of the inverter control cabinet in real time;

[0035] Multiple gas flow acquisition modules, which are respectively distributed at the output end of the compressor, the output end of the condenser and the output end of the evaporator in the vehicle air-conditioning equipment, and are respectively used to monitor the gas flow at the output end of the compressor, the output end of the condenser and the output end of the evaporator in real time;

[0036] A plurality of temperature sensors, wherein the plurality of temperature sensors are respectively distributed at the output end of the condenser and the output end of the evaporator in the vehicle air conditioning device, and are used to detect the gas temperature at the output end of the condenser and the output end of the evaporator in real time;

[0037] A parameter setting module, used to set the operating voltage and operating frequency of the output end of the inverter control cabinet of multiple energy levels, and to set the standard gas flow rate of the compressor, condenser and evaporator output ends and the standard gas temperature of the condenser and evaporator output ends in the vehicle air-conditioning equipment corresponding to each energy level;

[0038] The data analysis system uses the data obtained by the voltage, frequency acquisition module, gas flow acquisition module and temperature sensor, and combines it with the data set in the parameter setting module to analyze and determine whether the operation of the operating components, voltage, frequency acquisition module, gas flow acquisition module and parameter setting module inside the vehicle air-conditioning equipment is normal.

[0039] Compared with the prior art, the present invention has the following beneficial effects:

[0040] The energy efficiency monitoring and management method and system of electromechanical equipment for new energy use monitors the working voltage and working frequency of the output end of the inverter control cabinet and the gas flow of the compressor output end, the condenser output end and the evaporator output end in the vehicle air-conditioning equipment, as well as the gas temperature of the condenser output end and the evaporator output end in real time to judge the matching of the gas flow and gas temperature with the working voltage and working frequency of the corresponding energy level monitored in real time, and according to the effective value of each phase current of the output end of the inverter control cabinet and the gas flow or gas temperature at different positions inside the vehicle air-conditioning equipment and the standard setting data, the data acquisition devices in the vehicle air-conditioning equipment and the inverter control cabinet and the problems existing in the running parts in the vehicle air-conditioning equipment can be accurately traced, which is conducive to timely maintenance and processing of problems existing in the vehicle air-conditioning equipment, avoiding the inefficient operation of the vehicle air-conditioning equipment, and facilitating the control and management of the energy efficiency of the vehicle air-conditioning equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 This is a flow chart of the energy efficiency monitoring and management system of the present invention. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions 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 are within the scope of protection of the present invention.

[0043] The embodiments of the energy efficiency monitoring and management method and system of the electromechanical equipment for new energy are as follows:

[0044] A method for monitoring and managing energy efficiency of electromechanical equipment for new energy use, comprising the following steps:

[0045] S1. Set the operating voltage and operating frequency of the output terminal of the inverter control cabinet of multiple energy levels, and set the standard gas flow rate of the compressor, condenser and evaporator output terminals and the standard gas temperature of the condenser and evaporator output terminals in the vehicle air-conditioning equipment corresponding to each energy level.

[0046] S2, monitor the operating voltage and operating frequency at the output end of the inverter control cabinet in real time.

[0047] S3. Real-time monitoring of the gas flow at the compressor output end, the condenser output end and the evaporator output end of the vehicle air-conditioning equipment, as well as the gas temperature at the condenser output end and the evaporator output end.

[0048] S4. Compare the real-time monitored gas flow and gas temperature with the standard gas flow and gas temperature of the corresponding energy level to determine whether the real-time monitored gas flow and gas temperature match the real-time monitored working voltage and working frequency of the corresponding energy level. If they match, continue to use the inverter control cabinet to perform frequency modulation control on the operation of the vehicle air-conditioning equipment. At this time, the operation status of the vehicle air-conditioning equipment is normal. If they do not match, execute S5.

[0049] S5. According to the real-time monitored gas flow and gas temperature, determine the abnormal gas flow or gas temperature at the output end, that is, the gas flow at one or more output ends of the compressor, condenser and evaporator is abnormal, and the gas temperature at one or two output ends of the condenser and evaporator is abnormal, and determine that the abnormal gas flow or gas temperature exceeds the standard or does not meet the standard.

[0050] Gas flow anomaly refers to the fact that the real-time monitored gas flow is different from the standard gas flow of the corresponding energy level, and gas temperature anomaly refers to the fact that the real-time monitored gas temperature is different from the standard gas temperature of the corresponding energy level.

[0051] S6. Detect the current signals of each phase at the output end of the inverter control cabinet and calculate the effective value of each phase current. The calculation of the effective value of each phase current is:

[0052]

[0053]

[0054] Among them, I x ,I y ,I z are the effective values ​​of the three-phase currents x, y and z respectively, ix, iy and iz are the three-phase currents x, y and z at the output end of the inverter respectively, and t and T are both time;

[0055] If the effective value of each phase current is less than the set current of the vehicle air conditioning device of the corresponding energy level, and the abnormal gas flow or gas temperature exceeds the standard, it is determined that there is a problem with the device used to detect the current signal of each phase or the device used to monitor the abnormal gas flow or gas temperature in real time;

[0056] If the effective value of each phase current is less than the set current of the vehicle air-conditioning equipment, and the abnormal gas flow or gas temperature does not meet the standard, it means that the working voltage and working frequency are too low at this time, and the inverter control cabinet should be used to increase the working voltage and working frequency; if the effective value of each phase current is greater than the set current of the vehicle air-conditioning equipment, and the abnormal gas flow or gas temperature exceeds the standard, it means that the working voltage and working frequency are too high at this time, and the inverter control cabinet should be used to lower the working voltage and working frequency;

[0057] If the effective value of each phase current is less than the set current of the vehicle air-conditioning equipment of the corresponding energy level, and the gas flow at the compressor output end, the condenser output end and the evaporator output end or the gas temperature at the condenser output end and the evaporator output end exceeds the standard, and all abnormal gas flow rates or gas temperatures can match the operating voltage and operating frequency of other energy levels, this situation indicates that the compressor, condenser and evaporator are operating normally, and the real-time monitoring devices at the corresponding output ends are operating normally, and it is determined that there is a problem with the device used to detect the current signals of each phase.

[0058] Along the gas transmission direction, when abnormal gas flow or gas temperature occurs, if the detection result of the device corresponding to the abnormal gas flow or gas temperature and the next device of the same type do not meet the transmission loss standard of the gas flow or gas temperature, it is determined that there is a problem with the device corresponding to the abnormal gas flow or gas temperature; the gas flow loss standard refers to the loss of flow velocity in each flow stage when the gas flows normally between the compressor, condenser and evaporator, and the gas temperature loss standard is the heat consumption generated during normal flow between the condenser and the evaporator.

[0059] S7. If the effective value of each phase current is greater than the set current of the vehicle air-conditioning equipment of the corresponding energy level, and the abnormal gas flow or gas temperature does not meet the standard, it is determined that there is a problem with the operating components in the vehicle air-conditioning equipment, and the operating components include the compressor, condenser and evaporator.

[0060] Along the gas transmission direction, when abnormal gas flow or gas temperature occurs, if the detection result of the device corresponding to the abnormal gas flow or gas temperature and the next device of the same type meet the transmission loss standard of the gas flow or gas temperature, it is determined that there is a problem with the operating component corresponding to the abnormal gas flow or gas temperature.

[0061] If the effective value of each phase current is greater than the set current of the vehicle air-conditioning equipment of the corresponding energy level, and the gas flow at the compressor output, condenser output and evaporator output or the gas temperature at the condenser output and evaporator output are not up to standard, and all abnormal gas flow or gas temperature can match the working voltage and working frequency of other energy levels, it is determined that there are problems with other operating components in the vehicle air-conditioning equipment except the compressor, condenser and evaporator; other operating components include filters and fans.

[0062] The methods for determining whether the inverter output terminal in the inverter control cabinet is operating normally include:

[0063] Calculate the phase difference of each phase current at the inverter output end, and determine whether the phase difference of the three-phase currents x, y, and z is 120°. If the phase difference of the three-phase current is not 120°, it is determined that the inverter output end in the inverter control cabinet is abnormal. The phase angle of each phase current at the inverter output end is:

[0064]

[0065]

[0066] in, are the phase angles of the three-phase currents x, y, and z respectively. Therefore, the phase differences of the currents of each phase are:

[0067] k is a constant and f is the frequency.

[0068] See also Figure 1 A new energy electromechanical equipment energy efficiency monitoring and management system includes a data acquisition system and a data analysis system. The data acquisition system includes a voltage and frequency acquisition module, multiple gas flow acquisition modules, multiple temperature sensors, and a parameter setting module.

[0069] The voltage and frequency acquisition module is used to monitor the working voltage and working frequency of the output end of the inverter control cabinet in real time; multiple gas flow acquisition modules are distributed at the output end of the compressor, the output end of the condenser and the output end of the evaporator in the vehicle air-conditioning equipment, and are used to monitor the gas flow at the compressor output end, the condenser output end and the evaporator output end in real time.

[0070] Multiple temperature sensors are respectively distributed at the output ends of the condenser and the output ends of the evaporator in the vehicle air-conditioning equipment, and are used to detect the gas temperature at the output ends of the condenser and the evaporator in real time; the parameter setting module is used to set the operating voltage and operating frequency of the output ends of the inverter control cabinet of multiple energy levels, and set the standard gas flow of the compressor, condenser and evaporator output ends in the vehicle air-conditioning equipment corresponding to each energy level, as well as the standard gas temperature of the condenser and evaporator output ends.

[0071] The data analysis system uses the data obtained by the voltage, frequency acquisition module, gas flow acquisition module and temperature sensor, and combines it with the data set in the parameter setting module to analyze and determine whether the operation of the operating components, voltage, frequency acquisition module, gas flow acquisition module and parameter setting module inside the vehicle air-conditioning equipment is normal.

[0072] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for monitoring and managing energy efficiency of electromechanical equipment for new energy, characterized in that: The following steps are involved: S1. Set the operating voltage and operating frequency of the output end of the inverter control cabinet of multiple energy levels, and set the standard gas flow rate of the compressor, condenser and evaporator output ends and the standard gas temperature of the condenser and evaporator output ends in the vehicle air-conditioning equipment corresponding to each energy level; S2, real-time monitoring of the operating voltage and operating frequency at the output end of the inverter control cabinet; S3, real-time monitoring of the gas flow at the compressor output end, the condenser output end and the evaporator output end of the vehicle air-conditioning equipment, and the gas temperature at the condenser output end and the evaporator output end; S4, determining whether the gas flow rate and gas temperature monitored in real time match the working voltage and working frequency of the corresponding energy level monitored in real time, if they match, continuously using the inverter control cabinet to perform frequency modulation control on the operation of the vehicle air conditioning equipment, if they do not match, executing S5; S5. Determine the abnormal gas flow or gas temperature at the output end according to the gas flow and gas temperature monitored in real time, and determine whether the abnormal gas flow or gas temperature exceeds the standard or does not meet the standard; S6. Detect the current signals of each phase at the output end of the inverter control cabinet and calculate the effective value of each phase current; if the effective value of each phase current is less than the set current of the vehicle air-conditioning device of the corresponding energy level, and the abnormal gas flow or gas temperature exceeds the standard, it is determined that there is a problem with the device for detecting the current signals of each phase or the device for real-time monitoring of the abnormal gas flow or gas temperature; S7. If the effective value of each phase current is greater than the set current of the vehicle air-conditioning device of the corresponding energy level, and the abnormal gas flow or gas temperature does not meet the standard, it is determined that there is a problem with the operating components in the vehicle air-conditioning device.

2. The method for monitoring and managing energy efficiency of electromechanical equipment for new energy use according to claim 1 is characterized in that: The S6 also includes: If the effective value of each phase current is less than the set current of the vehicle air-conditioning equipment, and the abnormal gas flow or gas temperature does not meet the standard, the inverter control cabinet is used to increase the working voltage and working frequency; if the effective value of each phase current is greater than the set current of the vehicle air-conditioning equipment, and the abnormal gas flow or gas temperature exceeds the standard, the inverter control cabinet is used to lower the working voltage and working frequency.

3. The method for monitoring and managing energy efficiency of electromechanical equipment for new energy use according to claim 1 is characterized in that: The specific method for determining in S6 that there is a problem with the device for detecting the current signals of each phase includes: If the effective value of each phase current is less than the set current of the vehicle air-conditioning equipment of the corresponding energy level, and at the same time the gas flow rate at the compressor output end, the condenser output end and the evaporator output end or the gas temperature at the condenser output end and the evaporator output end exceeds the standard, and all the abnormal gas flow rates or gas temperatures can match the operating voltages and operating frequencies of other energy levels, it is determined that there is a problem with the device used to detect the current signals of each phase.

4. The method for monitoring and managing energy efficiency of electromechanical equipment for new energy use according to claim 3 is characterized in that: The specific method for determining in S6 that there is a problem with the device for real-time monitoring of the abnormal gas flow or gas temperature includes: Along the gas transmission direction, when abnormal gas flow or gas temperature occurs, if the detection result of the device corresponding to the abnormal gas flow or gas temperature and the next device of the same type do not meet the transmission loss standard of the gas flow or gas temperature, it is determined that there is a problem with the device corresponding to the abnormal gas flow or gas temperature.

5. The method for monitoring and managing energy efficiency of electromechanical equipment for new energy use according to claim 4 is characterized in that: The specific method of determining whether there is a problem with the operating components of the vehicle air conditioning device in S7 includes: Along the gas transmission direction, when abnormal gas flow or gas temperature occurs, if the detection result of the device corresponding to the abnormal gas flow or gas temperature and the next device of the same type meet the transmission loss standard of the gas flow or gas temperature, it is determined that there is a problem with the operating component corresponding to the abnormal gas flow or gas temperature.

6. The method for monitoring and managing energy efficiency of electromechanical equipment for new energy use according to claim 5 is characterized in that: The specific method for determining whether there is a problem with the operating components of the vehicle air conditioning device in S7 further includes: If the effective value of each phase current is greater than the set current of the vehicle air-conditioning equipment of the corresponding energy level, and at the same time the gas flow rate at the compressor output end, the condenser output end and the evaporator output end or the gas temperature at the condenser output end and the evaporator output end are not up to standard, and all the abnormal gas flow rates or gas temperatures can match the working voltage and working frequency of other energy levels, it is determined that there are problems with other operating components in the vehicle air-conditioning equipment except the compressor, condenser and evaporator.

7. The method for monitoring and managing energy efficiency of electromechanical equipment for new energy use according to claim 6 is characterized in that: The method for determining whether the inverter output terminal in the inverter control cabinet operates normally includes: The phase difference of each phase current at the output end of the inverter is calculated to determine whether the phase difference of the three-phase current is 120°. If the phase difference of the three-phase current is not 120°, it is determined that the operating state of the inverter output end in the inverter control cabinet is abnormal.

8. A new energy electromechanical equipment energy efficiency monitoring and management system, using the new energy electromechanical equipment energy efficiency monitoring and management method according to claim 7, characterized in that: It includes a data acquisition system and a data analysis system, and the data acquisition system includes: Voltage and frequency acquisition module, used to monitor the working voltage and frequency at the output end of the inverter control cabinet in real time; A plurality of gas flow collection modules, wherein the plurality of gas flow collection modules are respectively distributed at the output end of the compressor, the output end of the condenser and the output end of the evaporator in the vehicle air-conditioning device, and are respectively used to monitor the gas flow at the output end of the compressor, the output end of the condenser and the output end of the evaporator in real time; A plurality of temperature sensors, wherein the plurality of temperature sensors are respectively distributed at the output end of the condenser and the output end of the evaporator in the vehicle air conditioning device, and are used to detect the gas temperature at the output end of the condenser and the output end of the evaporator in real time; A parameter setting module, used to set the operating voltage and operating frequency of the output end of the inverter control cabinet of multiple energy levels, and to set the standard gas flow rate of the compressor, condenser and evaporator output ends and the standard gas temperature of the condenser and evaporator output ends in the vehicle air-conditioning equipment corresponding to each energy level; The data analysis system uses the data obtained by the voltage, frequency acquisition module, gas flow acquisition module and temperature sensor, and combines it with the data set in the parameter setting module to analyze and determine whether the operation of the operating components, voltage, frequency acquisition module, gas flow acquisition module and parameter setting module inside the vehicle air-conditioning equipment is normal.

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