Compressor frequency conversion starting and speed regulating device and method for compressed air energy storage

Abstract

The invention discloses a compressor frequency conversion starting and speed regulating device and method for compressed air energy storage, and belongs to the technical field of electric digital data processing. Various basic monitoring numerical values of a frequency converter are correctly processed and analyzed in a plurality of aspects through a method for executing monitoring during operation of the frequency converter; the operation condition of the frequency converter in the current period is integrally judged, the frequency converter in the fault operation condition is marked in time, the fault condition distinguishing layer of the frequency converter is integrally judged by combining the two methods of data analysis and simulation analysis, and the fault operation condition of the frequency converter can be more directly and accurately mastered by a monitor. The defects that the diversity and the complexity of the operation condition of the frequency converter are neglected in the prior art, the fault-free condition of the frequency converter is mistakenly recognized as the fault condition or the fault condition of the frequency converter is mistakenly recognized as the fault-free condition, and a monitor is difficult to master the fault operation condition of the frequency converter and the damage amplitude of the frequency converter are effectively avoided.

Description

Technical Field

[0001] The present invention belongs to the technical field of electric digital data processing, and in particular relates to a compressor variable frequency starting and speed regulating device and method for compressed air energy storage. Background Art

[0002] Compressed air energy storage technology, as a highly promising clean energy storage solution, has gradually become a key link in solving the problem of energy supply and demand mismatch in recent years. Its basic principle is to compress air under high pressure and store it in underground caves or special gas tanks. When the power system needs additional energy, the high-pressure air is released to drive the turbine generator to rotate, thereby converting it into electrical energy.

[0003] In practical applications, the current compressed air energy storage technology is as mentioned in the prior art solution with patent publication number "CN221575177U", which often includes two columns of compression devices for compressed air energy storage, the two columns of compression devices are respectively a first column of compression devices and a second column of compression devices; each column of compression devices is formed by a frequency converter and a multi-stage compressor; the multi-stage compressors are connected in series; the compressors are connected to the compressor power frequency power supply segment via the compressor power frequency incoming line switch, the frequency conversion bus segment of the first column of compression devices and the frequency conversion bus segment of the second column of compression devices are interconnected, and the frequency conversion bus segment of the first column of compression devices and the second column of compression devices are connected to each other. The frequency conversion bus sections of the compression devices are interconnected via the frequency conversion bus section interconnecting switch, and the frequency converter, the compressor power frequency incoming line switch and the interconnecting switch (the compressor power frequency incoming line switch and the interconnecting switch can be circuit breakers) are all connected to the PLC; when the frequency converter has no faults, the frequency conversion bus section interconnecting switch is disconnected, and the two columns of compression devices operate separately. When the frequency converter of any column fails, the PLC closes the compressor power frequency incoming line switch connected to the last compressor of the other column and switches the last compressor of the other column to power frequency operation, and the PLC closes the interconnecting switch connected to the frequency converter that is operating normally and supplies power to the frequency conversion bus section connected to the faulty frequency converter.

[0004] It can be seen that confirming inverter faults is the key to starting and regulating the speed of the compression device used for compressed air energy storage. Although the current methods for confirming inverter faults can instantly sample the operating values ​​of the inverter, they often lack the correct processing and analysis technology for the values, resulting in insufficient accuracy and integrity in confirming the operating status of the inverter. For example, some methods only use a single boundary value comparison to confirm whether the inverter is in a fault state. This type of method ignores the diversity and complexity of the inverter's operating conditions, and often results in mistaking the inverter's non-fault state for a fault state or mistaking the inverter's fault state for a non-fault state, making it difficult for the monitor to grasp the inverter's faulty operating condition and its damage range. Summary of the invention

[0005] In order to solve the defects in the prior art, the present invention proposes a compressor variable frequency starting and speed regulation device and method for compressed air energy storage, which effectively avoids the problems of the prior art method of confirming the fault of the frequency converter used for compressed air energy storage, such as the lack of accuracy and integrity in confirming the operating status of the frequency converter, ignoring the diversity and cumbersomeness of the operating status of the frequency converter, mistaking the non-fault status of the frequency converter for a fault status or mistaking the fault status of the frequency converter for a non-fault status, making it difficult for the monitor to grasp the faulty operating status of the frequency converter and the extent of its damage.

[0006] The present invention uses the following technical solutions.

[0007] A compressor variable frequency starting and speed regulation method for compressed air energy storage, comprising: The sensor group transmits the operating value of the inverter to the PLC, and the PLC confirms the operating status of the inverter based on the sampled operating value of the inverter. When a fault is found in the inverter of any column, the PLC closes the power frequency incoming line switch of the compressor connected to the last compressor of the other column to switch the last compressor of the other column to power frequency operation, and the PLC closes the contact switch connected to the inverter that is running normally to supply power to the inverter bus section connected to the faulty inverter. The method for PLC to confirm the operating status of the inverter based on the operating value of the inverter transmitted by sampling includes: Step 1, set up the status monitoring period, and obtain the initial analysis value of the inverter status after each status monitoring period; Step 2, define the status initial analysis limit value. When the status initial analysis value of the inverter is not lower than the status initial analysis limit value, the operation status of the inverter is defined as a fault operation status. When the status initial analysis value of the inverter is lower than the status initial analysis limit value, the operation status of the inverter is defined as a non-fault operation status. Step 3, when the inverter status is defined as a fault status, sample the running values ​​of various basic monitoring values ​​of the inverter during the status monitoring period, and obtain the target values ​​of various basic monitoring values ​​of the inverter during the status monitoring period, construct the inverter operation simulation model based on the running values ​​and target values ​​of various basic monitoring values, and execute the inverter operation simulation model Simulate the work and obtain the running status perfection value of each simulation work , , is the total frequency of simulation work, is the frequency number of the simulation work, and the operation condition improvement factor is defined as , ; , establish a numerical range of each operating condition improvement factor corresponding to an operating condition improvement value, the numerical range includes , Corresponding to , using the equation Get the fault status identification level value of the inverter ; Step 4, obtain the fault status identification level of the inverter according to the fault status identification level value, and then the PLC sends the fault status identification level to the display screen for display.

[0008] Furthermore, in Step 1, the method for obtaining the initial analytical value of the inverter status includes: dividing the status monitoring period into The start analysis time intervals of the conditions with the same interval size are obtained, the start analysis values ​​of each condition start analysis time interval are obtained, a Cartesian coordinate system is constructed by taking the condition monitoring period as the horizontal axis and the start analysis value as the vertical axis, the start analysis values ​​of each condition start analysis time interval are marked in the Cartesian coordinate system in the form of coordinate values, and the adjacent coordinate values ​​in the Cartesian coordinate system are connected by line segments to obtain the condition start analysis line segments.

[0009] Furthermore, in Step 1, the method for obtaining the initial analytical value of the inverter state also includes: using the definite integral method to calculate the definite integral of each line segment between the starting point and the end point of the initial analytical line segment of the state, and defining the sum of the calculated definite integrals as the initial analytical basic quantity , define the start resolution time interval limit value, when the start resolution value of the status start resolution time interval is not less than the start resolution time interval limit value, define the status start resolution time interval as the exceeding status time interval, compare every two exceeding status time intervals in all exceeding status time intervals with each other, when two exceeding status time intervals are adjacent status start resolution time intervals, increase the exceeding status consecutive number by one, when two exceeding status time intervals are non-adjacent status start resolution time intervals, increase the exceeding status single number by one, and define the exceeding status consecutive number as , define the number of transcendental states as , using the equation Get the initial analysis value of the inverter status , here, is the transcendental coherence factor, It is a factor that transcends single independence.

[0010] Further, in Step 1, the method for obtaining the starting analysis value of the status starting analysis time interval includes: obtaining the operating values ​​of various basic monitoring values ​​of the inverter in the status starting analysis time interval transmitted by the sensor group sampling, thereby obtaining the basic monitoring quantity of various basic monitoring values, defining the basic monitoring limit value, when the basic monitoring quantity of the basic monitoring value is not lower than the basic monitoring limit value, defining the basic monitoring value as exceeding the basic value, when the basic monitoring quantity of the basic monitoring value is lower than the basic monitoring limit value, defining the basic monitoring value as a regular basic value, performing cumulative processing on all basic monitoring quantities exceeding the basic values ​​and then obtaining an average, and treating the average as the exceeding level quantity, performing cumulative processing on the basic monitoring quantities of all regular basic values ​​and then obtaining an average, and treating the average as the regular level quantity, and defining the quantity obtained by subtracting the regular level quantity from the exceeding level quantity as ,Bundle As horizontal distance , combine every two basic values ​​in all the basic values ​​to form a transcendent interaction pair, add the basic monitoring quantities of the two basic values ​​in the transcendent interaction pair, the sum is the transcendent interaction quantity, define the transcendent linkage limit value, when the transcendent interaction quantity is not less than the transcendent linkage limit value, define the corresponding transcendent interaction pair as an abnormal interaction pair, and define the total number of abnormal interaction pairs as , using the equation Get the start resolution value of the status start resolution time interval .

[0011] Furthermore, in Step 1, the method for obtaining basic monitoring quantities of various basic monitoring values ​​includes: obtaining basic monitoring modes corresponding to various basic monitoring values, performing pre-processing on the operating values ​​of various basic monitoring values ​​using a Gaussian filter, and sending the operating values ​​of various basic monitoring values ​​after the pre-processing to corresponding basic monitoring modes respectively, and each basic monitoring mode sends a basic monitoring quantity of a type of basic monitoring value, thereby obtaining the basic monitoring quantities of various basic monitoring values.

[0012] Furthermore, in Step 1, each basic monitoring value corresponds to a basic monitoring mode, and the basic monitoring mode is constructed based on the long short-term memory network.

[0013] Furthermore, in Step 3, a method for constructing a perfect operation simulation model of the frequency converter is provided based on the operating values ​​and target values ​​of various basic monitoring values, including: using a Gaussian filter to perform pre-processing on the operating values ​​and target values ​​of the basic monitoring values, using COMSOL software or Flexsim software, and sending the pre-processed operating values ​​and target values ​​to COMSOL software or Flexsim software, and COMSOL software or Flexsim software exports the modeled model, and the modeled model is the perfect operation simulation model of the frequency converter.

[0014] Further, in Step 3, the method for obtaining the running condition perfection value of each simulation work includes: after the simulation work is completed, obtaining the CPU occupancy rate of the PLC during the entire simulation work And the total time of this simulation work , using the equation Get the running status of the simulation work , here, is the CPU utilization factor, is the total time factor.

[0015] Further, in Step 3, the method for obtaining the fault condition identification level of the inverter according to the fault condition identification level value includes: defining a plurality of fault condition identification level value intervals, wherein the plurality of fault condition identification level value intervals include , is the total number of numerical intervals. The fault condition identification level includes fault condition identification level 1, fault condition identification level 2...fault condition identification level , fault condition identification level , They correspond to fault condition identification level 1, fault condition identification level 2, fault condition identification level 3...fault condition identification level .

[0016] A compressor variable frequency starting and speed regulating device for compressed air energy storage, comprising: The display screen, sensor group, frequency converter, compressor power frequency incoming line switch and connecting switch are all connected to the PLC. The sensor group is used to transmit the operating value of the frequency converter to the PLC, and the PLC is used to confirm the operating status of the frequency converter based on the sampled operating value of the frequency converter. When a frequency converter failure is identified in any column, the PLC is also used to close the power frequency incoming line switch of the compressor connected to the last compressor of the other column to switch the last compressor of the other column to power frequency operation, and the PLC is also used to close the connecting switch connected to the frequency converter that is operating normally to supply power to the frequency conversion bus section connected to the faulty frequency converter. The modules on the PLC include: A setting module is used to set a status monitoring period, and obtain a starting analysis value of the status of the inverter after each status monitoring period; A definition module, which is used to define a status start analysis limit value. When the status start analysis value of the inverter is not lower than the status start analysis limit value, the operation status of the inverter is defined as a fault operation status. When the status start analysis value of the inverter is lower than the status start analysis limit value, the operation status of the inverter is defined as a non-fault operation status. The simulation module is used to sample the running values ​​of various basic monitoring values ​​of the inverter during the status monitoring period when the inverter status is defined as a fault status, and obtain the target values ​​of various basic monitoring values ​​of the inverter during the status monitoring period, construct the inverter operation simulation model according to the running values ​​and target values ​​of various basic monitoring values, and execute the inverter operation simulation model Simulate the work and obtain the running status perfection value of each simulation work , , is the total frequency of simulation work, is the frequency number of the simulation work, and the operation condition improvement factor is defined as , ; , establish a numerical range of each operating condition improvement factor corresponding to an operating condition improvement value, the numerical range includes , Corresponding to , using the equation Get the fault status identification level value of the inverter ; The display module is used to obtain the fault status identification level of the inverter according to the fault status identification level value, and then the PLC sends the fault status identification level to the display screen for display.

[0017] The beneficial effects of the present invention are that, compared with the prior art, the technical effects of the present invention include: Through Step 1 and Step 2, the basic monitoring values ​​of the inverter are correctly processed and analyzed in some aspects by monitoring during the operation of the inverter, and the operation status of the inverter in the current cycle is judged as a whole, and the inverter with faulty operation status is marked in time. Through Step 3 and Step 4, the fault status identification level of the inverter is judged as a whole by combining data analysis and simulation analysis, which is conducive to the monitor to grasp the faulty operation status of the inverter more directly and accurately. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a flow chart of the compressor variable frequency starting and speed regulation method for compressed air energy storage described in the present invention; Figure 2 It is a partial structural diagram of the compressor variable frequency starting and speed regulation device for compressed air energy storage described in the present invention. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the present invention clearer, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely express the technical solution of the present invention. The embodiments expressed in this application are only partial embodiments of the present invention, not all embodiments. According to the spirit of the present invention, other embodiments obtained by technicians in this field without creative work are all within the protection scope of the present invention.

[0020] like Figure 1 As shown, the variable frequency starting and speed regulation method of a compressor for compressed air energy storage according to the present invention comprises: The sensor group transmits the operating value of the inverter to the PLC. The PLC confirms the operating status of the inverter based on the sampled operating value of the inverter, that is, confirms whether the inverter is in a faulty state. When it is determined that the inverter is not faulty, the PLC disconnects the connecting switch of the inverter bus section, and the two columns of compression devices operate separately. When it is determined that the inverter of any column is faulty, the PLC closes the power frequency incoming line switch of the compressor connected to the last compressor of the other column and switches the last compressor of the other column to power frequency operation. The PLC also closes the connecting switch connected to the inverter that is operating normally and supplies power to the inverter bus section connected to the faulty inverter. The method for PLC to confirm the operating status of the inverter based on the operating value of the inverter transmitted by sampling includes: Step 1, set up the status monitoring period, and obtain the initial analysis value of the inverter status after each status monitoring period; In a preferred but non-limiting implementation method of the present invention, in Step 1, the method for obtaining the initial analytical value of the inverter status includes: dividing the status monitoring period into The start analysis time intervals of the conditions with the same interval size are obtained, and the start analysis values ​​of each start analysis time interval are obtained. The condition monitoring period is used as the horizontal axis and the start analysis value is used as the vertical axis to construct a Cartesian coordinate system. The start analysis values ​​of each start analysis time interval of the condition are marked in the Cartesian coordinate system in the form of coordinate values, and the adjacent coordinate values ​​in the Cartesian coordinate system are connected with line segments to obtain the condition start analysis line segments. The condition monitoring period can be defined by oneself, which can be 3 seconds, 4 seconds, etc. The sampling rate of the sensors in the sensor group can be once per millisecond. It can be 20, 30, etc.

[0021] In a preferred but non-restrictive implementation method of the present invention, in Step 1, the method for obtaining the initial analytical value of the inverter status also includes: using the definite integral method to calculate the definite integral of each line segment between the starting point and the end point of the status initial analytical line segment (the method for calculating the definite integral of each line segment is to derive the line segment equation of each line segment and then use the definite integral method, and the line segment equation of each line segment can be obtained by the point-slope method of the prior art) and define the sum of the calculated definite integrals as the initial analytical basic quantity , define the starting resolution time interval limit value (the starting resolution time interval limit value is a pre-defined value, and its value is adjusted according to specific requirements), when the starting resolution value of the status starting resolution time interval is not less than the starting resolution time interval limit value, define the status starting resolution time interval as the exceeding status time interval, when the starting resolution value of the status starting resolution time interval is less than the starting resolution time interval limit value, do not deal with it, compare every two exceeding status time intervals in all exceeding status time intervals, when two exceeding status time intervals are adjacent status starting resolution time intervals, increase the exceeding status continuity number by one (the initial value of the exceeding status continuity number is zero), when two exceeding status time intervals are non-adjacent status starting resolution time intervals, increase the exceeding status single number by one (the initial value of the exceeding status single number is zero), and define the exceeding status continuity number as , define the number of transcendental states as , using the equation Get the initial analysis value of the inverter status , here, is the transcendental coherence factor, It is beyond the single factor, , . and The value can also be defined according to specific requirements.

[0022] In a preferred but non-restrictive implementation method of the present invention, in Step 1, the method for obtaining the starting parsing value of the status starting parsing time interval includes: obtaining the operating values ​​of various basic monitoring values ​​of the inverter in the status starting parsing time interval transmitted by the sensor group sampling (the combination of various basic monitoring values ​​can reflect the operating status of the inverter as a whole, and the types of basic monitoring values ​​include the frequency value of the inverter, the current value of the inverter, the power value of the inverter, etc. The frequency value of the inverter can be obtained through the frequency sensor 1 and the frequency sensor 2 in the sensor group, and the frequency sensor 1 and the frequency sensor 2 are respectively used to sample the input of the inverter The frequency and the output frequency of the inverter, the input frequency of the inverter or the output frequency of the inverter is the operating value of the frequency value, the current value of the inverter can be obtained through the current sensor 1 and the current sensor 2 in the sensor group, the current sensor 1 and the current sensor 2 are used to sample the input current of the inverter and the output current of the inverter respectively, the input current of the inverter or the output current of the inverter is the operating value of the current value, the power value of the inverter can be obtained through the power sensor 1 and the power sensor 2 in the sensor group, the power sensor 1 and the power sensor 2 are used to sample the input power of the inverter and the output power of the inverter respectively, the power of the inverter The input power or the output power of the inverter is the operating value of the power value), so as to obtain the basic monitoring quantity of various basic monitoring values, define the basic monitoring limit value (the basic monitoring limit value is a pre-defined value, and the value can be adjusted according to specific requirements). When the basic monitoring quantity of the basic monitoring value is not lower than the basic monitoring limit value, the basic monitoring value is defined as exceeding the basic value. When the basic monitoring quantity of the basic monitoring value is lower than the basic monitoring limit value, the basic monitoring value is defined as a regular basic value. All basic monitoring quantities exceeding the basic values ​​are accumulated and averaged (the average value is calculated after the accumulation). The method of taking the average is: take the sum of all basic monitoring quantities that exceed the basic value and divide it by the number of basic monitoring quantities that exceed the basic value, and take the average after performing the accumulation treatment on all basic monitoring quantities with normal basic values ​​(the method of taking the average after the accumulation treatment is: take the sum of all basic monitoring quantities with normal basic values ​​and divide it by the number of basic monitoring quantities with normal basic values, and take the average as the normal level, and define the quantity obtained by subtracting the normal level quantity from the exceeding level as ,Bundle As horizontal distance , combine every two exceeding basic values ​​in all exceeding basic values ​​into a exceeding interaction pair, add up the basic monitoring quantities of the two exceeding basic values ​​in the exceeding interaction pair, the added quantity is the exceeding interaction quantity, define the exceeding linkage limit value (the exceeding linkage limit value is a pre-defined value, and its value is adjusted according to specific requirements), when the exceeding interaction quantity is not lower than the exceeding linkage limit value, define the corresponding exceeding interaction pair as an abnormal interaction pair, when the exceeding interaction quantity is lower than the exceeding linkage limit value, no treatment is taken, and the total number of abnormal interaction pairs is defined as , using the equation Get the start resolution value of the status start resolution time interval .

[0023] In a preferred but non-restrictive implementation method of the present invention, in Step 1, the method for obtaining the basic monitoring quantity of each type of basic monitoring value includes: obtaining the basic monitoring mode corresponding to each type of basic monitoring value, performing pre-processing on the operating values ​​of each type of basic monitoring value using a Gaussian filter (the pre-processing method is to use a Gaussian filter to perform filtering processing on the operating values ​​of each type of basic monitoring value), and sending the operating values ​​of each type of basic monitoring value after the pre-processing to the corresponding basic monitoring mode respectively, and each basic monitoring mode sends out the basic monitoring quantity of a type of basic monitoring value, thereby obtaining the basic monitoring quantity of each type of basic monitoring value.

[0024] In the preferred but non-restrictive implementation method of the present invention, in Step 1, each type of basic monitoring value corresponds to a basic monitoring mode, and the basic monitoring mode is constructed based on the long short-term memory network. The construction method of each basic monitoring mode only differs in the sample set, just as the construction method of the basic monitoring mode of the frequency value can be: sampling the operating values ​​of a number of frequency values, the operating values ​​of each frequency value contain the input frequency of the inverter and the output frequency of the inverter, etc., performing pre-processing on the operating values ​​of each frequency value, introducing the long short-term memory network, and treating the operating values ​​after the pre-processing as the sample set of the long short-term memory network (if it is the basic monitoring mode of the power value of the inverter, the operating values ​​of the power value of the inverter are treated as the sample set of the long short-term memory network), and each sample set is autonomously given a basic monitoring value according to specific requirements. The value range of the basic monitoring value can be The higher the value of the basic monitoring quantity, the more abnormal the frequency value is (if it is the basic monitoring mode of the power value of the inverter, the more abnormal the power value of the inverter is). The lower the value of the basic monitoring quantity, the more reasonable the frequency value is. The sample set is divided into 80% learning set, 10% verification set and 10% evaluation set. The learning set, verification set and evaluation set are sent to the long short-term memory network for learning. After learning, the basic monitoring mode of the frequency value sent by the long short-term memory network is obtained.

[0025] Step 2, define the status starting analysis limit value (the status starting analysis limit value is a pre-defined value, and its value is adjusted according to specific requirements). When the status starting analysis value of the inverter is not lower than the status starting analysis limit value, the operating state of the inverter is defined as a faulty operating state. When the status starting analysis value of the inverter is lower than the status starting analysis limit value, the operating state of the inverter is defined as a non-fault operating state. The faulty operating state is a faulty state, and the non-fault operating state is a non-fault state.

[0026] Through Step 1 and Step 2, the basic monitoring values ​​of the inverter are correctly processed and analyzed in some aspects by monitoring during the operation of the inverter, so as to comprehensively judge the operating status of the inverter in the current cycle and efficiently confirm the inverter with faulty operating status.

[0027] Step 3, when the inverter status is defined as a fault status, sample the running values ​​of various basic monitoring values ​​of the inverter during the status monitoring period, and obtain the target values ​​of various basic monitoring values ​​of the inverter during the status monitoring period (the target value is the running value that various basic monitoring values ​​should reach or maintain when the inverter is in a fault-free operation state, which are all pre-set values). Construct the inverter operation simulation model based on the running values ​​and target values ​​of various basic monitoring values, and execute the inverter operation simulation model. Simulation work (that is, each simulation work performs preset improvement adjustments on the parameters in the model to improve the function and stability of the inverter. The parameters include the inverter's acceleration and deceleration time, torque compensation and other parameters to improve the inverter's frequency regulation ability and torque regulation accuracy, etc.), and obtain the operating condition improvement value of each simulation work , , is the total frequency of simulation work, is the frequency number of the simulation job, The bigger The larger the value of is, the better the operating condition factor is defined as , ; , establish a numerical range of each operating condition improvement factor corresponding to an operating condition improvement value, the numerical range includes , Corresponding to , as in the perfect value of running condition When , the corresponding operating condition improvement factor is , using the equation Get the fault status identification level value of the inverter ; In a preferred but non-restrictive implementation method of the present invention, in Step 3, a method for constructing a perfect operation simulation model of the frequency converter according to the operating values ​​and target values ​​of various basic monitoring values ​​includes: using a Gaussian filter to perform pre-processing on the operating values ​​and target values ​​of the basic monitoring values ​​(the pre-processing method is to use a Gaussian filter to perform filtering processing on the operating values ​​and target values ​​of the basic monitoring values), using COMSOL software or Flexsim software, sending the pre-processed operating values ​​and target values ​​to COMSOL software or Flexsim software, and COMSOL software or Flexsim software will export the modeled model, and the modeled model is the perfect operation simulation model of the frequency converter.

[0028] In a preferred but non-limiting implementation method of the present invention, in Step 3, the method for obtaining the running condition perfection value of each simulation work includes: after the simulation work is completed, obtaining the CPU occupancy rate of the PLC during the entire simulation work And the total time of this simulation work , using the equation Get the running status of the simulation work , here, is the CPU utilization factor, is the total time factor, The value of is , The value of is . and The value can also be defined according to specific requirements.

[0029] Step 4, obtain the fault condition identification level of the inverter according to the fault condition identification level value, and then the PLC sends the fault condition identification level to the display screen for display, so that the monitor can directly grasp the current operating fault status of the inverter according to the fault condition identification level.

[0030] In a preferred but non-limiting implementation method of the present invention, in Step 3, the method for obtaining the fault condition identification level of the inverter according to the fault condition identification level value includes: defining a plurality of fault condition identification level value intervals (these value intervals can be set up according to specific requirements), and the plurality of fault condition identification level value intervals include: , is the total number of numerical intervals. The fault condition identification level includes fault condition identification level 1, fault condition identification level 2...fault condition identification level , fault condition identification level , They correspond to fault condition identification level 1, fault condition identification level 2, fault condition identification level 3...fault condition identification level , as in the fault condition discrimination level value Under the condition of the inverter fault condition identification level is fault condition identification level 1, the damage range of the inverter operation fault of fault condition identification level 1 is less than the damage range of the inverter operation fault of fault condition identification level 2. The damage extent of the inverter operation failure.

[0031] Through Step 3 and Step 4, the two methods of data analysis and simulation analysis are combined to comprehensively determine the fault condition identification level of the inverter, which is conducive to the monitor to grasp the fault operation condition of the inverter more directly and accurately.

[0032] like Figure 2 As shown, the compressor variable frequency starting and speed regulating device for compressed air energy storage described in the present invention comprises: Two rows of compression devices for compressed air energy storage, the two rows of compression devices are respectively the first row of compression devices and the second row of compression devices; each row of compression devices is formed by a frequency converter and a multi-stage compressor; the multi-stage compressors are connected in series; the compressor is connected to the compressor power frequency power supply segment via the compressor power frequency incoming line switch, the frequency conversion bus segment of the first row of compression devices and the frequency conversion bus segment of the second row of compression devices are interconnected, the frequency conversion bus segment of the first row of compression devices and the frequency conversion bus segment of the second row of compression devices are interconnected via the frequency conversion bus segment contact switch, the display screen, the sensor group, the frequency converter, the compressor power frequency incoming line switch and the contact switch (the compressor power frequency incoming line switch and the contact switch can be circuit breakers) are all connected to the PLC, and the sensor group is used to convert the frequency converter The operation value is transmitted to the PLC, and the PLC is used to confirm the operation status of the inverter based on the operation value of the inverter transmitted by sampling, that is, to confirm whether the inverter is in a faulty state; under the condition that the inverter is determined to be fault-free, the PLC is also used to disconnect the inverter bus section contact switch, and the two columns of compression devices operate separately. When the inverter of any column is determined to be faulty, the PLC is also used to close the compressor power frequency incoming line switch connected to the last compressor of the other column and switch the last compressor of the other column to power frequency operation, and the PLC is also used to close the contact switch connected to the inverter that is running without fault and supply power to the inverter bus section connected to the faulty inverter; determining that the inverter of any column is faulty is to determine that the inverter is in a faulty state. Determining that the inverter is fault-free is to determine that the inverter is in a fault-free state.

[0033] The modules on the PLC include: A setting module is used to set a status monitoring period, and obtain a starting analysis value of the status of the inverter after each status monitoring period; A definition module, which is used to define a status start analysis limit value. When the status start analysis value of the inverter is not lower than the status start analysis limit value, the operation status of the inverter is defined as a fault operation status. When the status start analysis value of the inverter is lower than the status start analysis limit value, the operation status of the inverter is defined as a non-fault operation status. The simulation module is used to sample the running values ​​of various basic monitoring values ​​of the inverter during the status monitoring period when the inverter status is defined as a fault status, and obtain the target values ​​of various basic monitoring values ​​of the inverter during the status monitoring period, construct the inverter operation simulation model according to the running values ​​and target values ​​of various basic monitoring values, and execute the inverter operation simulation model Simulate the work and obtain the running status perfection value of each simulation work , , is the total frequency of simulation work, is the frequency number of the simulation work, and the operation condition improvement factor is defined as , ; , establish a numerical range of each operating condition improvement factor corresponding to an operating condition improvement value, the numerical range includes , Corresponding to , using the equation Get the fault status identification level value of the inverter ; The display module is used to obtain the fault status identification level of the inverter according to the fault status identification level value, and then the PLC sends the fault status identification level to the display screen for display.

[0034] The beneficial effects of the present invention are that, compared with the prior art, the technical effects of the present invention include: Through Step 1 and Step 2, the basic monitoring values ​​of the inverter are correctly processed and analyzed in some aspects by monitoring during the operation of the inverter, and the operation status of the inverter in the current cycle is judged as a whole, and the inverter with faulty operation status is marked in time. Through Step 3 and Step 4, the fault status identification level of the inverter is judged as a whole by combining data analysis and simulation analysis, which is conducive to the monitor to grasp the faulty operation status of the inverter more directly and accurately.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents, and any modifications or equivalent replacements that do not deviate from the spirit and scope of the present invention should be covered within the protection space of the claims of the present invention.

Claims

1. A compressor variable frequency starting and speed regulation method for compressed air energy storage, characterized in that: include: The sensor group transmits the operating value of the inverter to the PLC, and the PLC confirms the operating status of the inverter based on the sampled operating value of the inverter. When a fault is found in the inverter of any column, the PLC closes the power frequency incoming line switch of the compressor connected to the last compressor of the other column to switch the last compressor of the other column to power frequency operation, and the PLC closes the contact switch connected to the inverter that is running normally to supply power to the inverter bus section connected to the faulty inverter. The method for PLC to confirm the operating status of the inverter based on the operating value of the inverter transmitted by sampling includes: Step 1, set up the status monitoring period, and obtain the initial analysis value of the inverter status after each status monitoring period; Step 2, define the status initial analysis limit value. When the status initial analysis value of the inverter is not lower than the status initial analysis limit value, the operation status of the inverter is defined as a fault operation status. When the status initial analysis value of the inverter is lower than the status initial analysis limit value, the operation status of the inverter is defined as a non-fault operation status. Step 3, when the inverter status is defined as a fault status, sample the running values ​​of various basic monitoring values ​​of the inverter during the status monitoring period, and obtain the target values ​​of various basic monitoring values ​​of the inverter during the status monitoring period, construct the inverter operation simulation model based on the running values ​​and target values ​​of various basic monitoring values, and execute the inverter operation simulation model Simulate the work and obtain the running status perfection value of each simulation work , , is the total frequency of simulation work, is the frequency number of the simulation work, and the operation condition improvement factor is defined as , ; , establish a numerical range of each operating condition improvement factor corresponding to an operating condition improvement value, the numerical range includes , Corresponding to , using the equation Get the fault status identification level value of the inverter ; Step 4, obtain the fault status identification level of the inverter according to the fault status identification level value, and then the PLC sends the fault status identification level to the display screen for display.

2. The compressor variable frequency starting and speed regulation method for compressed air energy storage according to claim 1 is characterized in that: In Step 1, the method for obtaining the inverter status initial analysis value includes: dividing the status monitoring period into The start analysis time intervals of the conditions with the same interval size are obtained, the start analysis values ​​of each condition start analysis time interval are obtained, a Cartesian coordinate system is constructed by taking the condition monitoring period as the horizontal axis and the start analysis value as the vertical axis, the start analysis values ​​of each condition start analysis time interval are marked in the Cartesian coordinate system in the form of coordinate values, and the adjacent coordinate values ​​in the Cartesian coordinate system are connected by line segments to obtain the condition start analysis line segments.

3. The compressor variable frequency starting and speed regulation method for compressed air energy storage according to claim 2 is characterized in that: In Step 1, the method for obtaining the initial analytical value of the inverter status also includes: using the definite integral method to calculate the definite integral of each line segment between the starting point and the end point of the initial analytical line segment of the status, and defining the sum of the calculated definite integrals as the initial analytical basic quantity , define the start resolution time interval limit value, when the start resolution value of the status start resolution time interval is not less than the start resolution time interval limit value, define the status start resolution time interval as the exceeding status time interval, compare every two exceeding status time intervals in all exceeding status time intervals with each other, when two exceeding status time intervals are adjacent status start resolution time intervals, increase the exceeding status consecutive number by one, when two exceeding status time intervals are non-adjacent status start resolution time intervals, increase the exceeding status single number by one, and define the exceeding status consecutive number as , define the number of transcendental states as , using the equation Get the initial analysis value of the inverter status , here, is the transcendental coherence factor, It is a factor that transcends single independence.

4. The compressor variable frequency starting and speed regulation method for compressed air energy storage according to claim 3 is characterized in that: In Step 1, the method for obtaining the starting analysis value of the status starting analysis time interval includes: obtaining the operating values ​​of various basic monitoring values ​​of the inverter in the status starting analysis time interval transmitted by the sensor group sampling, thereby obtaining the basic monitoring quantity of various basic monitoring values, defining the basic monitoring limit value, when the basic monitoring quantity of the basic monitoring value is not lower than the basic monitoring limit value, defining the basic monitoring value as exceeding the basic value, when the basic monitoring quantity of the basic monitoring value is lower than the basic monitoring limit value, defining the basic monitoring value as a regular basic value, performing cumulative processing on all basic monitoring quantities exceeding the basic values ​​and then obtaining an average, and treating the average as the exceeding level quantity, performing cumulative processing on all basic monitoring quantities of the regular basic values ​​and then obtaining an average, and treating the average as the regular level quantity, and defining the quantity obtained by subtracting the regular level quantity from the exceeding level quantity as ,Bundle As horizontal distance , combine every two basic values ​​in all the basic values ​​to form a transcendent interaction pair, add the basic monitoring quantities of the two basic values ​​in the transcendent interaction pair, the sum is the transcendent interaction quantity, define the transcendent linkage limit value, when the transcendent interaction quantity is not less than the transcendent linkage limit value, define the corresponding transcendent interaction pair as an abnormal interaction pair, and define the total number of abnormal interaction pairs as , using the equation Get the start resolution value of the status start resolution time interval .

5. The compressor variable frequency starting and speed regulation method for compressed air energy storage according to claim 4 is characterized in that: In Step 1, the method for obtaining the basic monitoring quantity of each basic monitoring value includes: obtaining the basic monitoring mode corresponding to each basic monitoring value, performing pre-processing on the operating values ​​of each basic monitoring value using a Gaussian filter, and sending the operating values ​​of each basic monitoring value after the pre-processing to the corresponding basic monitoring mode respectively, and each basic monitoring mode sends the basic monitoring quantity of a type of basic monitoring value, so as to obtain the basic monitoring quantity of each basic monitoring value.

6. The compressor variable frequency starting and speed regulation method for compressed air energy storage according to claim 5 is characterized in that: In Step 1, each basic monitoring value corresponds to a basic monitoring mode, and the basic monitoring mode is constructed based on the long short-term memory network.

7. The compressor variable frequency starting and speed regulation method for compressed air energy storage according to claim 6 is characterized in that: In Step 3, a method for constructing a perfect operation simulation model of the inverter is implemented based on the operating values ​​and target values ​​of various basic monitoring values, including: using a Gaussian filter to perform pre-processing on the operating values ​​and target values ​​of the basic monitoring values, using COMSOL software or Flexsim software, and sending the pre-processed operating values ​​and target values ​​to COMSOL software or Flexsim software, and COMSOL software or Flexsim software exports the model, which is the perfect operation simulation model of the inverter.

8. The compressor variable frequency starting and speed regulation method for compressed air energy storage according to claim 7, characterized in that: In Step 3, the method for obtaining the running status perfection value of each simulation work includes: after the simulation work is completed, obtaining the CPU occupancy rate of the PLC during the entire simulation work And the total time of this simulation work , using the equation Get the running status of the simulation work , here, is the CPU utilization factor, is the total time factor.

9. The compressor variable frequency starting and speed regulation method for compressed air energy storage according to claim 8, characterized in that: In Step 3, a method for obtaining a fault condition identification level of the inverter according to the fault condition identification level value includes: defining a plurality of fault condition identification level value intervals, wherein the plurality of fault condition identification level value intervals include , is the total number of numerical intervals. The fault condition identification level includes fault condition identification level 1, fault condition identification level 2...fault condition identification level , fault condition identification level , They correspond to fault condition identification level 1, fault condition identification level 2, fault condition identification level 3...fault condition identification level .

10. A compressor variable frequency starting and speed regulating device for compressed air energy storage, characterized in that: include: The display screen, sensor group, frequency converter, compressor power frequency incoming line switch and connecting switch are all connected to the PLC. The sensor group is used to transmit the operating value of the frequency converter to the PLC, and the PLC is used to confirm the operating status of the frequency converter based on the sampled operating value of the frequency converter. When a frequency converter failure is identified in any column, the PLC is also used to close the power frequency incoming line switch of the compressor connected to the last compressor of the other column to switch the last compressor of the other column to power frequency operation, and the PLC is also used to close the connecting switch connected to the frequency converter that is operating normally to supply power to the frequency conversion bus section connected to the faulty frequency converter. The modules on the PLC include: A setting module is used to set a status monitoring period, and obtain a starting analysis value of the status of the inverter after each status monitoring period; A definition module, which is used to define a status start analysis limit value. When the status start analysis value of the inverter is not lower than the status start analysis limit value, the operation status of the inverter is defined as a fault operation status. When the status start analysis value of the inverter is lower than the status start analysis limit value, the operation status of the inverter is defined as a non-fault operation status. The simulation module is used to sample the running values ​​of various basic monitoring values ​​of the inverter during the status monitoring period when the inverter status is defined as a fault status, and obtain the target values ​​of various basic monitoring values ​​of the inverter during the status monitoring period, construct the inverter operation simulation model according to the running values ​​and target values ​​of various basic monitoring values, and execute the inverter operation simulation model Simulate the work and obtain the running status perfection value of each simulation work , , is the total frequency of simulation work, is the frequency number of the simulation work, and the operation condition improvement factor is defined as , ; , establish a numerical range of each operating condition improvement factor corresponding to an operating condition improvement value, the numerical range includes , Corresponding to , using the equation Get the fault status identification level value of the inverter ; The display module is used to obtain the fault status identification level of the inverter according to the fault status identification level value, and then the PLC sends the fault status identification level to the display screen for display.

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