CN113970675A - Automatic test method and device for performance index of frequency converter - Google Patents
Automatic test method and device for performance index of frequency converter Download PDFInfo
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Abstract
The application discloses a method and a device for automatically testing performance indexes of a frequency converter, wherein the method comprises the following steps: reading a configuration file of a performance index test item to issue a control instruction to a frequency converter so that the frequency converter operates to a set working condition; acquiring test data of the performance index test item; calling a data analysis component to analyze the test data to obtain a performance index test result corresponding to the performance index test item; and recording the performance index test result. According to the method and the device, manual operation in the test process of the performance indexes of the frequency converter can be simulated through the configuration file, so that the frequency converter automatically operates to a set working condition, and then the obtained test data is processed through the data analysis component to obtain a performance index test result; the whole testing process does not need manual participation, the manual workload and the time required by testing are greatly reduced, meanwhile, the performance index can be automatically calculated according to the testing data, and the reliability of the testing result is improved.
Description
Technical Field
The application relates to the technical field of frequency converters, in particular to a method and a device for automatically testing performance indexes of a frequency converter.
Background
With the rapid development of power electronic technology and microelectronic technology, frequency converters are developing towards the direction of large capacity, high precision and quick response, and playing a great role in improving the automatic production rate and energy conservation and efficiency improvement. Therefore, the requirement of the performance test of the frequency converter is increasing day by day, and how to rapidly and accurately complete the performance test of the frequency converter becomes important.
The current frequency converter performance test process relates to frequency converter control instruction issuing, frequency converter running state data uploading, data storage and processing, test performance index calculation, frequency converter fault response processing and the like. The performance test of converter mostly all needs the performance index of test converter control motor operation under different rotational speeds, different output power conditions, and single performance index measurement needs to issue different control command repeatedly and gather corresponding performance data, still needs to obtain performance index according to relevant standard to data processing, and test process and performance index computational process repeatability are high, and the manual test can the inevitable error that appears and omit, influence the test quality.
Disclosure of Invention
In view of this, an object of the present application is to provide a method and an apparatus for automatically testing performance indexes of a frequency converter, so as to avoid errors and omissions caused by manual testing, improve efficiency, and reduce time cost.
The technical scheme adopted by the application for solving the technical problems is as follows:
according to one aspect of the application, an automatic testing method for performance indexes of a frequency converter is provided, and the method comprises the following steps:
reading a configuration file of a performance index test item to issue a control instruction to a frequency converter so that the frequency converter operates to a set working condition;
acquiring test data of the performance index test item;
calling a data analysis component to analyze the test data to obtain a performance index test result corresponding to the performance index test item;
and recording the performance index test result.
According to another aspect of the application, an automatic testing device for performance indexes of a frequency converter is provided, which comprises a reading module, an obtaining module, a calling module and a recording module;
the reading module is used for reading a configuration file of a performance index test item so as to issue a control instruction to the frequency converter to enable the frequency converter to operate to a set working condition;
the acquisition module is used for acquiring the test data of the performance index test item;
the calling module is used for calling a data analysis component so as to analyze the test data to obtain a performance index test result corresponding to the performance index test item;
and the recording module is used for recording the performance index test result.
According to the method and the device for automatically testing the performance indexes of the frequency converter, manual operation in the testing process of the performance indexes of the frequency converter can be simulated through the configuration file, so that the frequency converter automatically operates to a set working condition, and then the obtained testing data is processed through the data analysis component to obtain a performance index testing result; the whole testing process does not need manual participation, the manual workload and the time required by testing are greatly reduced, meanwhile, the performance index can be automatically calculated according to the testing data, and the reliability of the testing result is improved.
Drawings
Fig. 1 is a schematic flow chart of an automatic test method for performance indexes of a frequency converter according to an embodiment of the present application;
fig. 2 is a schematic diagram of an automatic testing apparatus for performance indexes of a frequency converter according to an embodiment of the present application;
FIG. 3 is a schematic diagram illustrating a performance index test item according to an embodiment of the present disclosure;
FIG. 4 is a schematic structural diagram of a system according to an embodiment of the present disclosure;
fig. 5 is a schematic diagram of an automatic test process of performance indexes of a frequency converter according to an embodiment of the present application;
FIG. 6 is a schematic diagram of a speed response time curve provided by an embodiment of the present application;
FIG. 7 is a schematic diagram of another system configuration provided by an embodiment of the present application;
fig. 8 is a schematic diagram of a dynamic speed change equivalent curve provided in the embodiment of the present application.
The implementation, functional features and advantages of the objectives of the present application will be further explained with reference to the accompanying drawings.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer and clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
Example one
As shown in fig. 1, an embodiment of the present application provides an automatic test method for performance indexes of a frequency converter, where the method includes:
step S11, reading a configuration file of a performance index test item to issue a control instruction to the frequency converter so that the frequency converter runs to a set working condition;
step S12, obtaining the test data of the performance index test item;
step S13, calling a data analysis component to analyze the test data to obtain a performance index test result corresponding to the performance index test item;
and step S14, recording the performance index test result.
In an example, the method further comprises:
before testing, converting the operation of the frequency converter into a parameter instruction according to a performance index test item and writing the parameter instruction into the configuration file.
In one example, different performance index tests are implemented with different profiles.
In an example, the reading the configuration file of the performance indicator test item further includes:
receiving a selection of the performance indicator test item;
in case the performance indicator test item has been selected, the step of reading a configuration file of the performance indicator test item is performed.
In an example, the receiving the selection of the performance indicator test item further comprises:
and displaying the performance index test items.
In one example, the frequency converters comprise a tested frequency converter and a tested frequency converter, and the configuration file comprises an identifier;
the issuing of the control instruction to the frequency converter to enable the frequency converter to operate to the set working condition comprises the following steps:
and distinguishing the tested frequency converter and the accompanying frequency converter according to the identifier so as to issue a control instruction to the tested frequency converter and the accompanying frequency converter, so that the tested frequency converter and the accompanying frequency converter run to a set working condition.
In one example, the obtaining the test data of the performance index test item includes:
and sampling the test data of the performance index test item and storing the test data as a single data file.
In an example, the method further comprises:
in the test process, if the frequency converter is stopped due to a fault, the test of the performance index test item of the current item is terminated, the fault information of the frequency converter is recorded, a stop instruction is issued, the fault is reset, and then the next performance index test item is skipped to carry out the test.
In one example, the recording the performance indicator test result further includes:
and after all the performance index test items are tested, writing the test results into the document according to the execution sequence of each performance index test item and storing the test results.
Example two
As shown in fig. 2, a second embodiment of the present application provides an automatic testing apparatus for performance indexes of a frequency converter, which includes a reading module 21, an obtaining module 22, a calling module 23, and a recording module 24;
the reading module 21 is configured to read a configuration file of a performance index test item, so as to issue a control instruction to the frequency converter, so that the frequency converter operates to a set working condition;
an obtaining module 22, configured to obtain test data of the performance index test item;
the calling module 23 is configured to call a data analysis component to analyze the test data to obtain a performance index test result corresponding to the performance index test item;
and the recording module 24 is configured to record the performance index test result.
In this example, before testing, the operation of the frequency converter is converted into a parameter instruction according to a performance index test item and written into the configuration file. Different performance index tests are realized through different configuration files.
In the test process, if the frequency converter is stopped due to a fault, the test of the performance index test item of the current item is terminated, the fault information of the frequency converter is recorded, a stop instruction is issued, the fault is reset, and then the next performance index test item is skipped to carry out the test.
In an example, the testing device further comprises a receiving module;
the receiving module is used for receiving the selection of the performance index test item; in case the performance level test item has been selected, the reading module 21 reads the configuration file of the performance level test item.
In one example, the test device further comprises a display module;
and the display module is used for displaying the performance index test items.
In one example, the frequency converters comprise a tested frequency converter and a tested frequency converter, and the configuration file comprises an identifier;
the issuing of the control instruction to the frequency converter to enable the frequency converter to operate to the set working condition comprises the following steps:
and distinguishing the tested frequency converter and the accompanying frequency converter according to the identifier so as to issue a control instruction to the tested frequency converter and the accompanying frequency converter, so that the tested frequency converter and the accompanying frequency converter run to a set working condition.
In one example, the obtaining the test data of the performance index test item includes:
and sampling the test data of the performance index test item and storing the test data as a single data file.
In one example, the test apparatus further comprises an output module;
and the output module is used for writing the test results into the document according to the execution sequence of each performance index test item and storing the test results after all the performance index test items are tested.
The following description is made in conjunction with the embodiments of fig. 3-8:
the implementation mode is realized by adopting a mixed programming mode of LabVIEW and MATLAB, wherein the LabVIEW is taken as a main body, and the MATLAB compiles a data processing process into a data analysis COM component for calling of the LabVIEW. And operating the frequency converter according to the content of the configuration file by LabVIEW, controlling the frequency converter to run and acquiring test data, calling an MATLAB data analysis COM component to process the test data to obtain a performance index test result, and outputting the performance index test result to a report.
According to the IEC 61800-2 regulation, the performance indexes of the frequency converter mainly comprise two types: static performance indexes such as speed stabilization precision, speed stabilization pulsation and the like, dynamic performance indexes such as rotating speed response time, rotating speed adjusting time, dynamic speed change equivalent and the like, the assessment key points of different performance indexes are different, and the calculation modes are also different.
The data analysis COM component compiled by MATLAB can realize analysis processing of different performance indexes according to a calculation mode specified by a standard, shorten data processing time and improve reliability of test results.
The frequency converter performance index test working condition can be divided into two conditions of no load and load, the test can be carried out only by one motor under the condition of no load, such as rotating speed response time and the like, the load working condition is realized by a motor to a towing platform, such as dynamic speed change equivalent and the like, the tested frequency converter and the accompanied frequency converter of the towing platform can be distinguished by identifiers of configuration files, and the configuration files can control the tested frequency converter and the accompanied frequency converter to cooperate and run together to realize the target working condition. The test condition of the frequency converter is realized through a configuration file, and before the test, the operation of the frequency converter needs to be converted into a parameter instruction in advance and written into the configuration file in a specified format. The content of the configuration file is compiled according to the tested performance index, different performance index tests are realized through different configuration files, the LabVIEW main interface displays performance index test items in a list form, each test item is provided with a corresponding configuration file, as shown in figure 3, the performance index to be tested can be selected on the LabVIEW main interface, each performance index test item can be configured to be tested or not, after the test is started, the LabVIEW can read the configuration files and perform corresponding tests according to the test items displayed on the main interface, the configured items which are not tested can automatically skip, and the next test is performed until all the test items are completed. If the frequency converter is stopped due to failure in the test process, the LabVIEW terminates the test of the current performance index test item, records the failure information of the frequency converter, issues a stop instruction and resets the failure, then jumps to the next test item for testing, and finally records the failure reason of the failed item into a report.
The first implementation mode comprises the following steps:
as shown in fig. 4, the system configuration required in the present embodiment mainly includes: PC end, converter and supporting power grade's motor. A LabVIEW operation library and an MATLAB operation library are required to be installed in advance at a PC end, the PC end is connected with a frequency converter through an Ethernet interface, and the frequency converter supports an Ethernet protocol and can be debugged and diagnosed through an IP address of the frequency converter; the three-phase voltage output of the frequency converter is connected to an alternating current motor, a high-precision code disc is installed on the motor, and rotating speed information can be uploaded to a PC (personal computer) end through the frequency converter.
The following description is based on a frequency converter rotating speed response time test as an example:
as shown in fig. 5, after the LabVIEW is initialized, an ethernet communication module is built in the LabVIEW, the instruction issuing and parameter reading of the frequency converter are realized according to the communication protocol of the frequency converter, the LabVIEW can uniquely identify the frequency converter to be tested through the IP address of the ethernet interface of the frequency converter, the parameter modification instruction is issued to the frequency converter to be tested, and the operation information of the frequency converter, such as the detection rotating speed of a code disc, can be read, so that the control and state monitoring of the frequency converter are realized.
The test procedure of the rotating speed response time needs to convert the test steps into configuration instructions according to the requirements of the configuration file format. The configuration file records the address, the modification value and the modification time of the parameter to be modified and the calling of the data analysis COM component, and the LabVIEW can obtain the currently required operation instruction by reading the configuration file during testing and analyzing the configuration file, and sequentially sends control instructions to the frequency converter according to the set time sequence to enable the frequency converter to operate to the set working condition.
The required performance index can be tested after the frequency converter operates to a set working condition, taking the rotating speed response time as an example, as shown in fig. 6, according to the IEC 61800-2 regulation, a step rotating speed instruction is given to the frequency converter, the time taken by the frequency converter from the moment when the rotating speed given step starts to the moment when the rotating speed of the motor reaches the rotating speed value of the initial given value superposed by 90% of the step quantity for the first time is the required rotating speed response time, therefore, the rotating speed response time can be calculated only by setting the rotating speed and the actual motor rotating speed, the rotating speed given and the actual motor rotating speed are sampled at equal intervals by constructing a data acquisition module through LabVIEW, the data are stored according to different channels after being acquired, and the data are stored as a single data file for data analysis and use.
After test data are obtained, the LabVIEW calls an MATLAB data analysis COM component, the data analysis COM component reads the test data and can obtain motor rotating speed information at a given moment of a rotating speed instruction and at each moment, time when the rotating speed of the motor reaches a rotating speed value of 90% step quantity is obtained through operation, the rotating speed information is subtracted from the given time of the rotating speed instruction to obtain rotating speed response time, then the MATLAB data analysis COM component feeds back the obtained performance index to the LabVIEW for recording, and one-time performance index test can be completed, namely the test under an output condition.
A single performance index test includes tests under a variety of different output conditions. For example, the speed response time index requires testing under different speed output conditions. After LabVIEW completes the performance index test under one output condition, the test under another output condition of the performance index is continued according to the configuration file until the performance index test of the current test item is completed, and then the LabVIEW stores the test result of the performance index test. And then reading the configuration file again if the next performance index test exists, and then completing the performance test according to the configuration file.
After all the performance test items are tested, the LabVIEW output module can re-sort the test results of all the test items, the test results of the single performance test items are written into a word document in a table form according to the execution sequence of the test items and stored, and after the test is finished, all performance indexes of the frequency converter and fault records under fault conditions can be clearly and visually known by checking the word document.
The second embodiment:
as shown in fig. 7, the system configuration required in the present embodiment mainly includes: PC end, ethernet switch, two converters and supporting power level's motor. A LabVIEW operation library and an MATLAB operation library are required to be installed in advance at the PC end, and the frequency converter supports an Ethernet protocol and can be debugged and diagnosed through an IP address of the frequency converter; the PC end, the tested frequency converter and the accompanied frequency converter communicate in the same local area network through the Ethernet switch, the IP addresses of the two frequency converters are different, and the corresponding frequency converter can be operated by the LabVIEW through the unique corresponding identifier in the configuration file. The three-phase voltage output of the frequency converter is connected to an alternating current motor, a high-precision code disc is installed on the motor, and rotating speed information can be uploaded to a PC (personal computer) end through the frequency converter.
The following explanation is based on the frequency converter dynamic speed change equivalent test as an example:
the method comprises the steps of building an Ethernet communication module in LabVIEW, achieving command issuing and parameter reading of a frequency converter according to a communication protocol of the frequency converter, enabling the LabVIEW to identify the frequency converter to be tested and an accompanying frequency converter through an IP address of an Ethernet interface of the frequency converter, enabling different IP addresses to correspond to different identifiers, issuing parameter modification commands to the frequency converter to be tested and the accompanying frequency converter respectively according to the identifiers, reading running information of the frequency converter such as coded disc detection rotating speed, and achieving control and state monitoring of the frequency converter.
The dynamic speed change equivalent test flow converts the test steps into configuration instructions according to the requirements of a configuration file format. The tested frequency converter and the accompanied frequency converter can be distinguished through the identifier in the configuration file, the address, the modification value, the modification time and the calling of the data analysis module of the parameters to be modified are recorded in the configuration file, the LabVIEW can obtain the currently required operation instruction and the frequency converter object to be controlled through reading the configuration file during testing, and sequentially sends the control instruction to the corresponding frequency converters according to the set time sequence, so that the tested frequency converter and the accompanied frequency converter run to the set working condition.
The performance index required by the test can be started after the frequency converter operates to a set working condition, taking the dynamic speed change equivalent as an example, the dynamic speed change equivalent is a main index for describing the following performance of the frequency converter control and is used for representing the noise immunity performance, and the smaller the dynamic speed change equivalent is, the stronger the noise immunity is, and the better the following performance is. As shown in fig. 8, according to the IEC 61800-2 rule, when the frequency converter to be tested operates stably at a certain speed, the rotation speed is changed by loading the frequency converter suddenly, the dynamic speed change equivalent refers to the percentage of the integral of the rotation speed with respect to time and the rated synchronous rotation speed in the response time of the motor speed change process, wherein the response time of the speed change process refers to the time from the moment of load torque step to the moment when the rotation speed is recovered to the range of steady-speed pulsation for the first time. Therefore, the speed change equivalent index can be obtained by calculating the actual motor rotating speed. And LabVIEW issues a torque loading instruction to the accompanying frequency converter through a configuration file, then a data acquisition module is built through the LabVIEW, the loaded actual motor rotating speed is sampled at equal intervals and stored, and the sampled actual motor rotating speed is stored as a single data file for data analysis.
After test data are obtained, the MATLAB data analysis COM component is called by the LabVIEW, the rotation speed change of the loading process can be obtained after the test data are read by the data analysis COM component, a dynamic speed change equivalent index can be obtained through operation, then the obtained performance index is fed back to the LabVIEW by the MATLAB data analysis COM component to be recorded, and one-time performance index test can be completed, namely the test under an output condition.
A single performance index test includes tests under a variety of different output conditions. For example, dynamic speed change equivalence indicators, require testing at different rotational speed outputs. After LabVIEW completes the performance index test under one output condition, the test under another output condition of the performance index is continued according to the configuration file until the performance index test of the current test item is completed, and then the LabVIEW stores the test result of the performance index test. And then reading the configuration file again if the next performance index test exists, and then completing the performance test according to the configuration file.
After all the performance test items are tested, the LabVIEW output module can re-sort the test results of all the test items, the test results of the single performance test items are written into a word document in a table form according to the execution sequence of the test items and stored, and after the test is finished, all performance indexes of the frequency converter and fault records under fault conditions can be clearly and visually known by checking the word document.
The preferred embodiments of the present application have been described above with reference to the accompanying drawings, and are not intended to limit the scope of the claims of the application accordingly. Any modifications, equivalents and improvements which may occur to those skilled in the art without departing from the scope and spirit of the present application are intended to be within the scope of the claims of the present application.
Claims (10)
1. A method for automatically testing performance indexes of a frequency converter is characterized by comprising the following steps:
reading a configuration file of a performance index test item to issue a control instruction to a frequency converter so that the frequency converter operates to a set working condition;
acquiring test data of the performance index test item;
calling a data analysis component to analyze the test data to obtain a performance index test result corresponding to the performance index test item;
and recording the performance index test result.
2. The method of claim 1, further comprising:
before testing, converting the operation of the frequency converter into a parameter instruction according to a performance index test item and writing the parameter instruction into the configuration file.
3. The method of claim 1, wherein reading the configuration file of the performance indicator test item further comprises:
receiving a selection of the performance indicator test item;
in case the performance indicator test item has been selected, the step of reading a configuration file of the performance indicator test item is performed.
4. The method of claim 3, wherein receiving the selection of the performance metric test item further comprises:
and displaying the performance index test items.
5. The method of claim 1, wherein the transducers comprise a transducer under test and a transducer under test, the configuration file comprises an identifier;
the issuing of the control instruction to the frequency converter to enable the frequency converter to operate to the set working condition comprises the following steps:
and distinguishing the tested frequency converter and the accompanying frequency converter according to the identifier so as to issue a control instruction to the tested frequency converter and the accompanying frequency converter, so that the tested frequency converter and the accompanying frequency converter run to a set working condition.
6. The method of claim 1, wherein the obtaining test data for the performance indicator test item comprises:
and sampling the test data of the performance index test item and storing the test data as a single data file.
7. The method of claim 1, further comprising:
in the test process, if the frequency converter is stopped due to a fault, the test of the performance index test item of the current item is terminated, the fault information of the frequency converter is recorded, a stop instruction is issued, the fault is reset, and then the next performance index test item is skipped to carry out the test.
8. The method of claim 1, wherein the recording the performance indicator test results further comprises:
and after all the performance index test items are tested, writing the test results into the document according to the execution sequence of each performance index test item and storing the test results.
9. The method of claim 1, wherein different performance index tests are implemented with different profiles.
10. The automatic testing device for the performance indexes of the frequency converter is characterized by comprising a reading module, an obtaining module, a calling module and a recording module;
the reading module is used for reading a configuration file of a performance index test item so as to issue a control instruction to the frequency converter to enable the frequency converter to operate to a set working condition;
the acquisition module is used for acquiring the test data of the performance index test item;
the calling module is used for calling a data analysis component so as to analyze the test data to obtain a performance index test result corresponding to the performance index test item;
and the recording module is used for recording the performance index test result.
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