Operation monitoring method and system for frequency converter

Abstract

The invention belongs to the technical field of frequency converter supervision, and particularly relates to an operation monitoring method and system for a frequency converter, and the system comprises a server, a power fault detection module, a cooling operation monitoring module, a filter screen analysis module and a remote monitoring early warning module. According to the invention, the power fault detection module monitors the power of the frequency converter and identifies the power fault of the frequency converter, the power risk of the frequency converter can be gradually and comprehensively analyzed and early warned in time, and the cooling operation monitoring module reasonably analyzes the operation performance of the cooling fan in the frequency converter and accurately feeds back the operation performance. And when a cooling operation qualified signal is generated, a filter screen analysis module is used for carrying out inspection emergency analysis on a filter screen at an air inlet in the frequency converter, so that background management personnel can take corresponding treatment measures in time, safe and stable operation of the frequency converter is ensured, the management difficulty of the frequency converter is remarkably reduced, and the intelligent level is high.

Description

Technical Field

[0001] The present invention relates to the technical field of frequency converter supervision, and in particular to an operation monitoring method and system for a frequency converter. Background Art

[0002] The frequency converter is an electric energy control device that uses frequency conversion technology and microelectronics technology to convert AC power with fixed voltage and frequency into AC power with variable voltage and frequency. Its working principle mainly includes four parts: rectification, filtering, inversion and control. As an important power regulation equipment, the frequency converter plays an important role in industrial production, mechanical equipment, transportation and other fields.

[0003] At present, it is difficult to fully analyze and accurately feedback the power failure of the inverter during the operation of the inverter, and it is difficult to accurately analyze the operating status of the cooling fan in the inverter and reasonably evaluate the urgency of checking the air inlet filter when judging that the cooling fan is operating normally. This is not conducive to ensuring the safe and stable operation of the inverter, increasing the difficulty of inverter operation supervision, and the level of intelligence is low;

[0004] In view of the above technical defects, a solution is now proposed. Summary of the invention

[0005] The object of the present invention is to provide a method and system for monitoring the operation of a frequency converter, which solves the problem that the prior art is difficult to comprehensively analyze and accurately feedback the power failure of the frequency converter, and is difficult to accurately analyze the operating status of the cooling fan in the frequency converter and reasonably evaluate the urgency of checking the air inlet filter when judging that the cooling fan is operating normally, which is not conducive to ensuring the safe and stable operation of the frequency converter.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] An operation monitoring system for a frequency converter, comprising a server, a power fault detection module, a cooling operation monitoring module, a filter analysis module and a remote monitoring and early warning module;

[0008] During the operation of the inverter, the power fault detection module monitors the power of the inverter, identifies the power fault of the inverter, and sends the power fault information of the inverter to the remote monitoring and early warning module via the server. The remote monitoring and early warning module displays the power fault information and issues corresponding early warnings.

[0009] The cooling operation monitoring module obtains the cooling fan for heat dissipation in the inverter, monitors and analyzes the operating status of the cooling fan, generates a cooling operation qualified signal or a cooling operation abnormal signal through analysis, and sends the cooling operation abnormal signal to the remote monitoring and early warning module via the server, and sends the cooling operation qualified signal to the filter analysis module;

[0010] When the filter analysis module receives the cooling operation qualified signal, it will check the filter at the air inlet of the inverter for urgency analysis, generate a filter warning signal or a filter normal signal through analysis, and send the filter warning signal to the remote monitoring and warning module via the server; the remote monitoring and warning module will issue a corresponding warning when it receives the cooling operation abnormality signal or the filter warning signal.

[0011] Furthermore, the specific analysis process of the power fault detection module is as follows:

[0012] The load current of the frequency converter is collected, and the load current is compared with a preset suitable load current range. If the load current is not within the preset suitable load current range, it is determined that there is a power fault in the frequency converter;

[0013] If the load current is within the preset appropriate load current range, the input voltage, input current, output voltage and output frequency of the inverter are collected, and the input voltage, input current, output voltage and output frequency are compared with the corresponding preset data requirements one by one. If the input voltage, input current, output voltage or output frequency does not meet the corresponding data requirements, it is determined that there is a power failure in the inverter.

[0014] Furthermore, if the input voltage, input current, output voltage and output frequency all meet the corresponding data requirements, the variance of all input voltages per unit time is calculated to obtain the input voltage stability error value, and similarly, the input current stability error value, output voltage stability error value and frequency stability error value are obtained;

[0015] The input pressure stability value, the input current stability value, the output pressure stability value and the frequency stability value are numerically compared with the preset input pressure stability threshold, the preset input current stability threshold, the preset output pressure stability threshold and the preset frequency stability threshold. If the input pressure stability value, the input current stability value, the output pressure stability value or the frequency stability value exceeds the corresponding preset threshold, it is judged that there is a power fault in the inverter; if the input pressure stability value, the input current stability value, the output pressure stability value and the frequency stability value do not exceed the corresponding preset threshold, it is judged that there is no power fault in the inverter.

[0016] Furthermore, the specific analysis process of the cooling operation monitoring module is as follows:

[0017] The actual speed of the cooling fan in the inverter is collected, and the deviation value of the actual speed compared with the set standard speed is marked as the fan speed detection value; the vibration data and noise data generated when the cooling fan is running are collected, and the ratio of the vibration data to the actual speed is marked as the fan vibration detection value, and the ratio of the noise data to the actual speed is marked as the fan noise detection value;

[0018] The cooling operation monitoring value is obtained by numerically calculating the fan rotation detection value, the fan vibration detection value and the fan noise detection value, and the cooling operation monitoring value is numerically compared with the preset cooling operation monitoring threshold value. If the cooling operation monitoring value exceeds the preset cooling operation monitoring threshold value, it is determined that the cooling fan is in a poor operation state;

[0019] The total duration of the cooling fan in a poor operating state within a unit time is obtained and marked as the total cooling operation abnormality time value, and the number of occurrences of the cooling fan in a poor operating state exceeding the preset single duration threshold is marked as a high duration frequency, and all cooling operation monitoring values ​​of the cooling fan in a unit time are averaged to obtain the cooling operation value;

[0020] The cooling operation evaluation value is obtained by numerically calculating the total time value of the cooling operation abnormality, the high continuous frequency and the cooling operation condition value, and the cooling operation evaluation value is numerically compared with the preset cooling operation evaluation threshold. If the cooling operation evaluation value exceeds the preset cooling operation evaluation threshold, a cooling operation abnormality signal is generated; if the cooling operation evaluation value does not exceed the preset cooling operation evaluation threshold, a cooling operation qualified signal is generated.

[0021] Furthermore, the filter analysis module performs an urgency analysis on the filter at the air inlet of the inverter. The specific analysis process is as follows:

[0022] The air inlet speed at the air inlet of the inverter is collected, and the ratio of the air inlet speed to the actual speed of the cooling fan is calculated to obtain the air inlet speed value, and the air inlet speed value is compared with the preset air inlet speed value range. If the air inlet speed value is not within the preset air inlet speed value range, the air inlet judgment symbol JP-1 is assigned;

[0023] The number of times the air intake judgment symbol JP-1 is allocated per unit time is obtained and marked as the air intake abnormality detection value, and the average of all air intake speed values ​​per unit time is calculated to obtain the air intake speed detection value, and the deviation value of the air intake speed detection value compared to the median value of the preset air intake speed value range is marked as the air intake speed table value;

[0024] The inlet air abnormality detection value and the inlet air speed meter value are numerically compared with the preset inlet air abnormality detection threshold and the preset inlet air speed meter threshold respectively. If the inlet air abnormality detection value or the inlet air speed meter value exceeds the corresponding preset threshold, a filter warning signal is generated; if neither the inlet air abnormality detection value nor the inlet air speed meter value exceeds the corresponding preset threshold, a filter re-inspection analysis is performed.

[0025] Further, the specific analysis process of the filter re-inspection analysis is as follows:

[0026] The interval duration between the current moment and the last moment when the filter was inspected and cleaned is obtained and marked as the inspection interval duration, as well as the outer ring impact value of the filter within the inspection interval duration. The filter re-inspection evaluation value is obtained by numerically calculating the inspection interval duration and the outer ring impact value. The filter re-inspection evaluation value is numerically compared with the preset filter re-inspection evaluation threshold. If the filter re-inspection evaluation value exceeds the preset filter re-inspection evaluation threshold, a filter warning signal is generated; if the filter re-inspection evaluation value exceeds the preset filter re-inspection evaluation threshold, a filter normal signal is generated.

[0027] Furthermore, the filter analysis module is communicatively connected to the filter impact tracing module, and the filter impact tracing module performs real-time detection and analysis on the external environment of the filter to determine whether the external environment of the filter is in a highly polluted state, and obtains the outer ring impact value of the filter through analysis, and sends the outer ring impact value of the filter to the filter analysis module.

[0028] Further, the analysis and judgment method of high pollution state is as follows:

[0029] The dust concentration data of the external environment of the filter is collected and marked as the dust detection value, and the dust detection value is numerically compared with the preset dust detection threshold. If the dust detection value exceeds the preset dust detection threshold, it is judged that the external environment of the filter is in a highly polluted state.

[0030] Furthermore, the analysis and acquisition method of the outer ring influence value is as follows:

[0031] The total time that the external environment of the filter is in a high pollution state within the inspection interval is collected and marked as the high pollution condition value, and the dust inspection condition value is obtained by averaging all dust detection values ​​within the inspection interval. The high pollution condition value and the dust inspection condition value are numerically calculated to obtain the outer ring impact value.

[0032] Furthermore, the present invention also proposes a method for monitoring the operation of a frequency converter, comprising the following steps:

[0033] Step 1: The power fault detection module monitors the power of the inverter, identifies the power fault of the inverter, and sends the power fault information of the inverter to the remote monitoring and early warning module;

[0034] Step 2: The cooling operation monitoring module monitors and analyzes the cooling fan for heat dissipation in the inverter, generates a cooling operation qualified signal or a cooling operation abnormal signal through analysis, and sends the cooling operation abnormal signal to the remote monitoring and early warning module;

[0035] Step 3: After generating the cooling operation qualified signal, the filter analysis module checks the filter at the air inlet of the inverter for urgency analysis, generates a filter warning signal or a filter normal signal through analysis, and sends the filter warning signal to the remote monitoring warning module;

[0036] Step 4: When the remote monitoring and early warning module receives power failure information, cooling operation abnormality signal or filter early warning signal, it issues a corresponding early warning.

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] 1. In the present invention, the power failure detection module is used to monitor the power of the inverter and identify the power failure of the inverter, so that the power risk of the inverter can be gradually and comprehensively analyzed and timely warned, which is conducive to ensuring the safe and stable operation of the inverter. The cooling operation monitoring module is used to reasonably analyze the operating performance of the cooling fan in the inverter and accurately feedback, so as to timely remind the background management personnel to check and repair the cooling fan, ensure the subsequent heat dissipation and cooling performance, and ensure the safe and stable operation of the inverter;

[0039] 2. In the present invention, the cooling operation qualified signal is sent to the filter analysis module through the cooling operation monitoring module. When the filter analysis module receives the cooling operation qualified signal, it will check the filter at the air inlet of the inverter for urgency analysis, and when the filter warning signal is generated, it will remind the background management personnel to check and clean the filter in the inverter in time to ensure the subsequent filtering effect and air intake smoothness, further ensure the safe and stable operation of the inverter and significantly reduce the management difficulty of the inverter, with a high level of intelligence. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to facilitate understanding by those skilled in the art, the present invention is further described below in conjunction with the accompanying drawings;

[0041] Figure 1 This is a system block diagram of Embodiment 1 of the present invention;

[0042] Figure 2 This is a flow chart of the method of Embodiment 2 of the present invention. DETAILED DESCRIPTION

[0043] 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.

[0044] Embodiment 1: Figure 1As shown, the present invention proposes an operation monitoring system for a frequency converter, comprising a server, a power fault detection module, a cooling operation monitoring module, a filter analysis module and a remote monitoring and early warning module;

[0045] During the operation of the inverter, the power fault detection module monitors the power of the inverter, identifies the power fault of the inverter, and sends the power fault information of the inverter to the remote monitoring and early warning module through the server. The remote monitoring and early warning module displays the power fault information and issues corresponding early warnings. It can gradually and comprehensively analyze the power risk of the inverter and issue early warnings in time, so as to facilitate the background management personnel to quickly take corresponding treatment measures to ensure the safe and stable operation of the inverter. The specific analysis process of the power fault detection module is as follows:

[0046] The load current of the inverter is collected (the magnitude of the load current directly reflects the load condition of the inverter, and too large or too small current is likely to cause damage to the inverter), and the load current is compared with the preset suitable load current range. If the load current is not within the preset suitable load current range, it is determined that there is a power fault in the inverter;

[0047] If the load current is within the preset appropriate load current range, the input voltage, input current, output voltage and output frequency of the inverter are collected, and the input voltage, input current, output voltage and output frequency are compared with the corresponding preset data requirements one by one. If the input voltage, input current, output voltage or output frequency does not meet the corresponding data requirements, it is determined that there is a power failure in the inverter.

[0048] Furthermore, if the input voltage, input current, output voltage and output frequency all meet the corresponding data requirements, the variance of all input voltages per unit time is calculated to obtain the input voltage stability value. The larger the value of the input voltage stability value is, the more unstable the input voltage of the inverter is per unit time. Similarly, the input current stability value, output voltage stability value and frequency stability value are obtained.

[0049] The input pressure stability value, the input current stability value, the output pressure stability value and the frequency stability value are numerically compared with the preset input pressure stability threshold, the preset input current stability threshold, the preset output pressure stability threshold and the preset frequency stability threshold. If the input pressure stability value, the input current stability value, the output pressure stability value or the frequency stability value exceeds the corresponding preset threshold, it is judged that there is a power fault in the inverter; if the input pressure stability value, the input current stability value, the output pressure stability value and the frequency stability value do not exceed the corresponding preset threshold, it is judged that there is no power fault in the inverter.

[0050] The cooling operation monitoring module obtains the cooling fan for heat dissipation in the inverter, monitors and analyzes the operating status of the cooling fan, generates a cooling operation qualified signal or a cooling operation abnormal signal through analysis, and sends the cooling operation abnormal signal to the remote monitoring and early warning module via the server;

[0051] The remote monitoring and early warning module issues a corresponding early warning when it receives a cooling operation abnormality signal. It can reasonably analyze and accurately feedback the operating performance of the cooling fan in the inverter, and promptly remind the back-end management personnel to inspect and repair the cooling fan to ensure the subsequent heat dissipation and cooling performance, and further ensure the safe and stable operation of the inverter. The specific analysis process of the cooling operation monitoring module is as follows:

[0052] The actual speed of the cooling fan in the inverter is collected, and the deviation value of the actual speed compared with the set standard speed is marked as the fan speed detection value. The vibration data (i.e., the data value of the vibration amplitude) and the noise data (i.e., the data value of the noise decibel value) generated when the cooling fan is running are collected, and the ratio of the vibration data to the actual speed is marked as the fan vibration detection value, and the ratio of the noise data to the actual speed is marked as the fan noise detection value;

[0053] The fan rotation detection value WF, the fan vibration detection value WN and the fan noise detection value WR are numerically calculated by the formula WY=(np1*WF+np2*WN+np3*WR) / 3 to obtain the cooling operation monitoring value WY; wherein np1, np2, and np3 are preset proportional coefficients whose values ​​are greater than zero, and the larger the value of the cooling operation monitoring value WY is, the more abnormal the real-time operation status of the cooling fan is;

[0054] The cooling operation monitoring value WY is numerically compared with the preset cooling operation monitoring threshold. If the cooling operation monitoring value WY exceeds the preset cooling operation monitoring threshold, it indicates that the real-time operation status of the cooling fan is abnormal, and the cooling fan is judged to be in a poor operation state.

[0055] The total duration of the cooling fan in a poor operating state per unit time is obtained and marked as the total cooling operation abnormality time value, and the single duration of the cooling fan in a poor operating state is collected, and the number of occurrences of the single duration of the cooling fan in a poor operating state exceeding the preset single duration threshold is marked as a high continuous frequency, and all cooling operation monitoring values ​​of the cooling fan in a unit time are averaged to obtain the cooling operation value;

[0056] The cooling operation evaluation value XP is obtained by numerically calculating the cooling operation abnormality total time value XS, the high continuous frequency XM and the cooling operation condition value XW through the formula XP=ru2*XM+(ru1*XS+ru3*XW) / ru2; wherein ru1, ru2 and ru3 are preset proportional coefficients with values ​​greater than zero, and the larger the value of the cooling operation evaluation value XP is, the more abnormal the operation condition of the cooling fan is in general;

[0057] The cooling operation evaluation value XP is numerically compared with the preset cooling operation evaluation threshold. If the cooling operation evaluation value XP exceeds the preset cooling operation evaluation threshold, it indicates that the operating condition of the cooling fan is generally abnormal and the probability of a fault is high, and a cooling operation abnormal signal is generated; if the cooling operation evaluation value XP does not exceed the preset cooling operation evaluation threshold, it indicates that the operating condition of the cooling fan is generally normal and the probability of a fault is low, and a cooling operation qualified signal is generated.

[0058] The cooling operation monitoring module sends the cooling operation qualified signal to the filter analysis module. When the filter analysis module receives the cooling operation qualified signal, it checks the filter at the air inlet of the inverter for urgency analysis, generates a filter warning signal or a filter normal signal through analysis, and sends the filter warning signal to the remote monitoring warning module via the server;

[0059] When the remote monitoring and early warning module receives the filter warning signal, it issues a corresponding warning to remind the back-end management personnel to check and clean the filter in the inverter in time to ensure the subsequent filtering effect and air intake smoothness, which is conducive to ensuring the safe and stable operation of the inverter and significantly reducing the difficulty of inverter management; the specific analysis process of the inspection urgency analysis is as follows:

[0060] The air inlet speed at the air inlet of the inverter is collected, and the ratio of the air inlet speed to the actual speed of the cooling fan is calculated to obtain the air inlet speed value. The air inlet speed value is compared with the preset air inlet speed value range. If the air inlet speed value is not within the preset air inlet speed value range, it indicates that the real-time air inlet condition is abnormal, and the air inlet judgment symbol JP-1 is assigned;

[0061] The number of times the air intake judgment symbol JP-1 is allocated per unit time is obtained and marked as the air intake abnormality detection value, and the average of all air intake speed values ​​per unit time is calculated to obtain the air intake speed detection value, and the deviation value of the air intake speed detection value compared to the median value of the preset air intake speed value range is marked as the air intake speed table value;

[0062] The air intake abnormality detection value and the air intake velocity meter value are numerically compared with the preset air intake abnormality detection threshold value and the preset air intake velocity meter threshold value respectively. If the air intake abnormality detection value or the air intake velocity meter value exceeds the corresponding preset threshold value, it indicates that the air intake performance is generally abnormal and the probability of the filter being blocked or damaged is high, then a filter warning signal is generated;

[0063] If the inlet air abnormality detection value and the inlet air velocity meter value do not exceed the corresponding preset threshold value, the filter re-inspection analysis is performed. The specific analysis process of the filter re-inspection analysis is: obtaining the interval time between the current moment and the last time the filter was inspected and cleaned and marking it as the inspection interval time, and obtaining the outer ring impact value of the filter within the inspection interval time;

[0064] The filter re-inspection evaluation value LP is obtained by numerically calculating the inspection interval time LS and the outer ring influence value LY through the formula LP=a1*LS+a2*LY; wherein a1 and a2 are preset proportional coefficients with values ​​greater than zero, and the larger the value of the filter re-inspection evaluation value LP is, the more necessary it is to timely inspect and clean the filter in the inverter to ensure smooth air intake;

[0065] The filter re-inspection evaluation value LP is numerically compared with the preset filter re-inspection evaluation threshold. If the filter re-inspection evaluation value LP exceeds the preset filter re-inspection evaluation threshold, it indicates that the filter in the inverter needs to be inspected and cleaned in time, and a filter warning signal is generated; if the filter re-inspection evaluation value LP exceeds the preset filter re-inspection evaluation threshold, it indicates that the filter in the inverter does not need to be inspected and cleaned for the time being, and a filter normal signal is generated.

[0066] Embodiment 2: Figure 1 As shown, the difference between this embodiment and the first embodiment is that the filter analysis module is communicatively connected to the filter impact tracing module, and the filter impact tracing module performs real-time detection and analysis on the external environment of the filter to determine whether the external environment of the filter is in a high pollution state, and obtains the outer ring impact value LY of the filter through analysis, and sends the outer ring impact value LY of the filter to the filter analysis module, providing data support for the analysis process of the filter analysis module, and ensuring the accuracy of its analysis results; wherein, the analysis and judgment method of the high pollution state is as follows:

[0067] The dust concentration data of the external environment of the filter is collected and marked as the dust detection value, and the dust detection value is numerically compared with the preset dust detection threshold. If the dust detection value exceeds the preset dust detection threshold, it indicates that the pollution condition of the external environment of the filter is serious and dust is more likely to adhere to the filter, then the external environment of the filter is judged to be in a high pollution state.

[0068] Furthermore, the analysis and acquisition method of the outer ring impact value is as follows: the total time duration during which the external environment of the filter screen is in a high pollution state within the inspection interval is collected and marked as the high pollution condition value, and the dust detection value is obtained by averaging all dust detection values ​​within the inspection interval;

[0069] By formula The high pollution condition value SY and the dust inspection condition value SL are numerically calculated to obtain the outer loop influence value LY; wherein ew1 and ew2 are preset proportional coefficients whose values ​​are greater than zero, and the larger the value of the outer loop influence value LY, the worse the external environment condition of the filter within the inspection interval is overall, and the easier it is to cause the filter to be blocked.

[0070] Embodiment 3: Figure 2 As shown, the difference between this embodiment and the first and second embodiments is that the present invention provides a method for monitoring the operation of a frequency converter, comprising the following steps:

[0071] Step 1: The power fault detection module monitors the power of the inverter, identifies the power fault of the inverter, and sends the power fault information of the inverter to the remote monitoring and early warning module;

[0072] Step 2: The cooling operation monitoring module monitors and analyzes the cooling fan for heat dissipation in the inverter, generates a cooling operation qualified signal or a cooling operation abnormal signal through analysis, and sends the cooling operation abnormal signal to the remote monitoring and early warning module;

[0073] Step 3: After generating the cooling operation qualified signal, the filter analysis module checks the filter at the air inlet of the inverter for urgency analysis, generates a filter warning signal or a filter normal signal through analysis, and sends the filter warning signal to the remote monitoring warning module;

[0074] Step 4: When the remote monitoring and early warning module receives power failure information, cooling operation abnormality signal or filter early warning signal, it issues a corresponding early warning.

[0075] The working principle of the present invention: when in use, the power of the inverter is monitored and the power fault of the inverter is identified through the power fault detection module, which can gradually and comprehensively analyze the power risk of the inverter and timely warn, which is conducive to ensuring the safe and stable operation of the inverter, and the cooling fan for heat dissipation in the inverter is monitored and analyzed through the cooling operation monitoring module to generate a cooling operation abnormality signal or a cooling operation qualified signal, which can reasonably analyze the operating performance of the cooling fan in the inverter and accurately feedback, and when the cooling operation qualified signal is generated, the filter at the air inlet of the inverter is checked and analyzed for urgency through the filter analysis module, and a filter warning signal or a filter normal signal is generated through analysis, which facilitates the background management personnel to take corresponding processing measures in time, further ensuring the safe and stable operation of the inverter and significantly reducing the management difficulty of the inverter, and the intelligent level is high.

[0076] The above formulas are all dimensionless and numerical calculations. The formula is a formula obtained by collecting a large amount of data and performing software simulation to obtain the most recent real situation. The preset parameters in the formula are set by technicians in this field according to actual conditions. The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the contents of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that technicians in the relevant technical field can understand and use the present invention well. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. An operation monitoring system for a frequency converter, characterized in that: It includes server, power fault detection module, cooling operation monitoring module, filter analysis module and remote monitoring and early warning module; During the operation of the inverter, the power fault detection module monitors the power of the inverter, identifies the power fault of the inverter, and sends the power fault information of the inverter to the remote monitoring and early warning module via the server. The remote monitoring and early warning module displays the power fault information and issues corresponding early warnings. The cooling operation monitoring module obtains the cooling fan for heat dissipation in the inverter, monitors and analyzes the operating status of the cooling fan, generates a cooling operation qualified signal or a cooling operation abnormal signal through analysis, and sends the cooling operation abnormal signal to the remote monitoring and early warning module via the server, and sends the cooling operation qualified signal to the filter analysis module; When the filter analysis module receives the cooling operation qualified signal, it will check the filter at the air inlet of the inverter for urgency analysis, generate a filter warning signal or a filter normal signal through analysis, and send the filter warning signal to the remote monitoring and warning module via the server; the remote monitoring and warning module will issue a corresponding warning when it receives the cooling operation abnormality signal or the filter warning signal.

2. The operation monitoring system for a frequency converter according to claim 1, characterized in that: The specific analysis process of the power fault detection module is as follows: The load current of the frequency converter is collected, and the load current is compared with a preset suitable load current range. If the load current is not within the preset suitable load current range, it is determined that there is a power fault in the frequency converter; If the load current is within the preset appropriate load current range, the input voltage, input current, output voltage and output frequency of the inverter are collected, and the input voltage, input current, output voltage and output frequency are compared with the corresponding preset data requirements one by one. If the input voltage, input current, output voltage or output frequency does not meet the corresponding data requirements, it is determined that there is a power failure in the inverter.

3. The operation monitoring system for a frequency converter according to claim 2, characterized in that: If the input voltage, input current, output voltage and output frequency all meet the corresponding data requirements, the variance of all input voltages per unit time is calculated to obtain the input voltage stability error value. Similarly, the input current stability error value, output voltage stability error value and frequency stability error value are obtained. The input pressure stability value, the input current stability value, the output pressure stability value and the frequency stability value are numerically compared with the preset input pressure stability threshold, the preset input current stability threshold, the preset output pressure stability threshold and the preset frequency stability threshold. If the input pressure stability value, the input current stability value, the output pressure stability value or the frequency stability value exceeds the corresponding preset threshold, it is judged that there is a power fault in the inverter; if the input pressure stability value, the input current stability value, the output pressure stability value and the frequency stability value do not exceed the corresponding preset threshold, it is judged that there is no power fault in the inverter.

4. The operation monitoring system for a frequency converter according to claim 1, characterized in that: The specific analysis process of the cooling operation monitoring module is as follows: The actual speed of the cooling fan in the inverter is collected, and the deviation value of the actual speed compared with the set standard speed is marked as the fan speed detection value; the vibration data and noise data generated when the cooling fan is running are collected, and the ratio of the vibration data to the actual speed is marked as the fan vibration detection value, and the ratio of the noise data to the actual speed is marked as the fan noise detection value; The cooling operation monitoring value is obtained by numerically calculating the fan rotation detection value, the fan vibration detection value and the fan noise detection value, and the cooling operation monitoring value is numerically compared with the preset cooling operation monitoring threshold value. If the cooling operation monitoring value exceeds the preset cooling operation monitoring threshold value, it is determined that the cooling fan is in a poor operation state; The total duration of the cooling fan in a poor operating state within a unit time is obtained and marked as the total cooling operation abnormality time value, and the number of occurrences of the cooling fan in a poor operating state exceeding the preset single duration threshold is marked as a high duration frequency, and all cooling operation monitoring values ​​of the cooling fan in a unit time are averaged to obtain the cooling operation value; The cooling operation evaluation value is obtained by numerically calculating the total time value of cooling operation abnormality, the high continuous frequency and the cooling operation condition value, and the cooling operation evaluation value is numerically compared with the preset cooling operation evaluation threshold value. If the cooling operation evaluation value exceeds the preset cooling operation evaluation threshold value, a cooling operation abnormality signal is generated; If the cooling operation evaluation value does not exceed the preset cooling operation evaluation threshold, a cooling operation qualified signal is generated.

5. The operation monitoring system for a frequency converter according to claim 1, characterized in that: The filter analysis module checks the filter at the air inlet of the inverter for urgency analysis. The specific analysis process is as follows: The air inlet speed at the air inlet of the inverter is collected, and the ratio of the air inlet speed to the actual speed of the cooling fan is calculated to obtain the air inlet speed value, and the air inlet speed value is compared with the preset air inlet speed value range. If the air inlet speed value is not within the preset air inlet speed value range, the air inlet judgment symbol JP-1 is assigned; The number of times the air intake judgment symbol JP-1 is allocated per unit time is obtained and marked as the air intake abnormality detection value, and the average of all air intake speed values ​​per unit time is calculated to obtain the air intake speed detection value, and the deviation value of the air intake speed detection value compared to the median value of the preset air intake speed value range is marked as the air intake speed table value; The inlet air abnormality detection value and the inlet air velocity meter value are numerically compared with the preset inlet air abnormality detection threshold value and the preset inlet air velocity meter threshold value respectively. If the inlet air abnormality detection value or the inlet air velocity meter value exceeds the corresponding preset threshold value, a filter warning signal is generated; If the inlet air abnormality detection value and the inlet air velocity meter value do not exceed the corresponding preset threshold value, the filter re-inspection analysis is performed.

6. The operation monitoring system for a frequency converter according to claim 5, characterized in that: The specific analysis process of filter re-inspection analysis is as follows: The interval between the current time and the last time the filter was inspected and cleaned is obtained and marked as the inspection interval time, and the outer ring influence value of the filter within the inspection interval time is obtained, and the filter re-inspection evaluation value is obtained by numerically calculating the inspection interval time and the outer ring influence value; The filter re-inspection evaluation value is numerically compared with a preset filter re-inspection evaluation threshold value, and if the filter re-inspection evaluation value exceeds the preset filter re-inspection evaluation threshold value, a filter warning signal is generated; If the filter re-evaluation value exceeds the preset filter re-evaluation threshold, a filter normal signal is generated.

7. The operation monitoring system for a frequency converter according to claim 5, characterized in that: The filter analysis module is communicatively connected to the filter impact tracing module. The filter impact tracing module performs real-time detection and analysis on the external environment of the filter to determine whether the external environment of the filter is in a highly polluted state, and obtains the outer ring impact value of the filter through analysis, and sends the outer ring impact value of the filter to the filter analysis module.

8. The operation monitoring system for a frequency converter according to claim 7, characterized in that: The analysis and judgment methods for high pollution status are as follows: The dust concentration data of the external environment of the filter is collected and marked as the dust detection value, and the dust detection value is numerically compared with the preset dust detection threshold. If the dust detection value exceeds the preset dust detection threshold, it is judged that the external environment of the filter is in a highly polluted state.

9. The operation monitoring system for a frequency converter according to claim 7, characterized in that: The analysis and acquisition method of the outer ring influence value is as follows: The total time that the external environment of the filter is in a high pollution state within the inspection interval is collected and marked as the high pollution condition value, and the dust inspection condition value is obtained by averaging all dust detection values ​​within the inspection interval. The high pollution condition value and the dust inspection condition value are numerically calculated to obtain the outer ring impact value.

10. A method for monitoring the operation of a frequency converter, characterized in that: The method adopts the operation monitoring system for the frequency converter as described in any one of claims 1-9.

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