CN112649729A - Test system and test method for comprehensively evaluating control performance of frequency converter - Google Patents
Test system and test method for comprehensively evaluating control performance of frequency converter Download PDFInfo
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Abstract
The invention discloses a test system and a test method for comprehensively evaluating the control performance of a frequency converter, which comprises a voltage regulator, an accompanying frequency converter, an accompanying asynchronous motor, a motor shaft encoder, a coupler, a torque and rotation speed sensor, the frequency converter to be tested, the asynchronous motor to be tested, a display touch screen and an electric energy quality analyzer, wherein the accompanying asynchronous motor and the asynchronous motor to be tested driven by the frequency converter to be tested adopt the same shaft diameter and shaft center height, and the two motors are connected by adopting the torque and rotation speed sensor and the coupler. The invention realizes the comprehensive and objective evaluation of the control algorithm and the product performance by measuring and storing the input and output electric energy data, the rotating speed of the driven motor shaft and the torque data in the starting and steady-state operation processes of the frequency converter in real time, analyzing the rotating speed and torque control precision and the dynamic response speed of the frequency converter, the energy conversion efficiency and the loss and generating a test evaluation report, and can guide the development process of the frequency converter and improve the production quality level.
Description
The technical field is as follows:
the invention relates to the technical field of frequency converter testing, in particular to a testing system and a testing method for comprehensively evaluating the control performance of a frequency converter.
Background art:
with the development of power electronic application technology and digital signal processing technology, new devices and new technology are continuously applied to the field of frequency converters, so that the control performance of the frequency converter can be greatly improved, and correspondingly, new higher requirements are put forward on the frequency converter testing technology and means. The problems with conventional testing and evaluation means are: based on power frequency loading, the control performance of the low-frequency down converter cannot be evaluated; the method comprises the following steps that steady-state control performance evaluation is carried out on a to-be-tested end according to the load condition and steady-state operation condition of an accompanying-testing end, and a real-time data evaluation link of a frequency converter and a motor of the to-be-tested end is lacked; only the rotating speed, the torque, the voltage, the current amplitude and the like during steady-state operation of power frequency are concerned, and the transmission process of energy, such as the energy conversion efficiency, the loss condition of a frequency converter and a motor, is not concerned. The control precision and stability of the low-frequency torque and the rotating speed, the energy conversion efficiency and the self loss of the frequency converter and the loss generated by the output electric energy of the frequency converter on the motor are important indexes for measuring the control performance of the frequency converter.
The invention content is as follows:
aiming at the problems existing in the traditional test means at present, the invention provides a test system and a test method for comprehensively evaluating the control performance of a frequency converter. The invention realizes the comprehensive and objective evaluation of the control algorithm and the product performance by measuring and storing the input and output electric energy data, the rotating speed of the driven motor shaft and the torque data in the starting and steady-state operation processes of the frequency converter in real time, analyzing the rotating speed and torque control precision and the dynamic response speed of the frequency converter, the energy conversion efficiency and the loss and generating a test evaluation report, and can guide the development process of the frequency converter and improve the production quality level.
The invention is realized by the following technical scheme:
the invention provides a test system for comprehensively evaluating the control performance of a frequency converter, which comprises an asynchronous motor to be tested, a frequency converter to be tested, an accompanying asynchronous motor, an accompanying frequency converter, a three-phase voltage regulator, a torque and rotating speed sensor with a communication function, an electric energy quality analyzer with a communication function and a display touch screen (display touch screen) with a communication interface, wherein the asynchronous motor to be tested and the accompanying asynchronous motor are respectively connected with the torque and rotating speed sensor through couplers, the asynchronous motor to be tested and the accompanying asynchronous motor adopt the same shaft diameter and shaft center height, the frequency converter to be tested is connected with the asynchronous motor to be tested, the accompanying frequency converter is connected with the accompanying asynchronous motor, the voltage regulators are respectively connected with the frequency converter to be tested and the electric energy quality analyzer, the asynchronous motor to be tested is connected with the electric energy quality analyzer, and the electric energy quality analyzer, The torque and rotation speed sensors are respectively connected with the display touch screen.
The accompanying frequency converter performs closed-loop control on the accompanying asynchronous motor by accessing a speed signal of the shaft encoder, and realizes the output of 0-1.5 times of rated torque within the range from zero speed to rated rotating speed.
The frequency converter to be tested realizes constant-torque loaded starting and dynamic variable-torque constant-speed control by driving the asynchronous motor to be tested.
The display touch screen objectively and quantitatively evaluates the control performance of the frequency converter to be tested through input and output variable curves, a speed control performance report, a torque control performance report, an electric energy quality analysis report, an electric energy conversion efficiency analysis report, a motor loss analysis report and a frequency converter loss analysis report generated in the test process.
The system is connected with a torque rotating speed sensor and an electric energy quality analyzer through communication, measures rotating speed of an asynchronous motor to be measured, torque on a shaft, and voltage, current, frequency and harmonic frequency spectrums of an input end and an output end of a frequency converter to be measured, stores and draws curves, and evaluates speed control accuracy, torque output capacity, input and output voltage, current and frequency characteristic curves of the frequency converter to be measured.
The system evaluates the static constant torque starting and steady state operation control performance of the frequency converter to be tested to obtain the actual speed in the steady state, records the rotating speed curves in the starting process and the steady state operation process, and generates a speed control performance report of the frequency converter to be tested.
The system measures the time and amplitude of the load torque output by the accompanying frequency converter and the accompanying asynchronous motor in the starting process and the steady-state operation process of the frequency converter to be tested, records the torque curves in the starting process and the steady-state operation process, and generates a torque control performance report of the frequency converter to be tested.
The system measures output voltage, current and harmonic frequency spectrum of the frequency converter to be tested in the starting process and the steady-state operation process, records the voltage, current and harmonic frequency spectrum curves in the starting process and the steady-state operation process, and generates an output electric energy quality analysis report of the frequency converter to be tested.
The system calculates the output mechanical power of the frequency converter to be tested in real time by measuring the torque and the rotating speed of the asynchronous motor to be tested driven by the frequency converter to be tested, calculates the input side electric power of the frequency converter to be tested in real time by measuring the voltage and the current of the inlet side of the frequency converter to be tested, and generates an analysis report of the electric energy conversion efficiency of the frequency converter to be tested by measuring the input side electric power of the frequency converter to be tested and the mechanical power data of the motor.
The system calculates the mechanical power of the motor in real time by measuring the torque and the rotating speed of the asynchronous motor to be measured, calculates the input electric power of the motor in real time by measuring the voltage and the current of the asynchronous motor to be measured, calculates the loss of the motor by the input electric power and the output mechanical power, and generates a motor loss analysis report.
The system calculates the input side electric power of the frequency converter to be measured in real time by measuring the voltage and the current of the inlet side of the frequency converter to be measured, calculates the output side electric power of the frequency converter to be measured in real time by measuring the voltage and the current of the output side of the frequency converter to be measured, calculates the loss of the frequency converter to be measured by measuring the input side electric power and the output side electric power of the frequency converter to be measured, and generates a frequency converter loss analysis report.
The invention also provides a test method for comprehensively evaluating the control performance of the frequency converter, and the test system comprises the following steps:
(1) no-load starting and no-load steady-state speed control performance testing: the accompanying test frequency converter is not electrified or not started, voltage is not output to the accompanying test motor, and the no-load starting and steady-state running characteristics of the asynchronous motor to be tested driven by the frequency converter to be tested are tested;
(2) and (3) testing the performance of loaded starting, loaded steady-state speed control and torque control: the accompanying frequency converter is electrified and started and enters the running state from 0 to +/-TmaxLoad torque T output by the test-accompanying motor is set in stages between torque valuesL，TmaxRated torque T of motor not limited to 100%eFrom 0 to fmaxThe set frequency f of the frequency converter to be tested is adjusted in a segmented mannerset，fmaxRated frequency f of motor not limited to 100%eTesting the on-load starting, on-load steady-state speed control and torque control performances of the frequency converter to be tested;
(3) dynamic torque response test: after the test in the step 2 is finished, keeping the running states of the accompanying frequency converter and the frequency converter to be tested from 0 to fmaxThe set frequency f of the frequency converter to be tested is adjusted in a segmented mannersetAnd the frequency converter to be tested is in steady state operation from 0 to +/-Tmax、±TmaxChanging the load torque T output by the test-accompanying frequency converter in a step mode from 0 to two directionsLTesting the dynamic torque response characteristic of the frequency converter to be tested, wherein the setting mode of the dynamic torque is not limited to the method;
(4) analyzing the speed control performance of the frequency converter to be tested: the speed control performance report is based on the curves described by the test data of step 1, step 2 and step 3, and the speed control performance includes the speed overshoot nDeta1And steady state deviation nDeta2Wherein n isDeta1Deviation n of maximum rotation speed and set rotation speed for speed rising process and torque response processmax-nset，nDeta2Deviation n of steady-state average speed from set speedaver-nset；
(5) Analyzing the torque control performance of the frequency converter to be tested: the torque control performance report is based on the curves described by the test data of the step 2 and the step 3, and the torque ramp time of the accompanying frequency converter is trFrequency converter to be tested responds to load torque TLAnd reaches the set speed nsetThe time of stabilization is txAnd the torque response time of the frequency converter to be tested is tr1＝tx-tr，tr1For evaluating the torque response speed, t, of a frequency converter under testxThe other index for measuring the torque control performance of the frequency converter to be measured is the torque overshoot TDetaOvershoot TDetaFor the load torque TLAnd maximum output torque T in torque-up processmaxA difference of (i.e. T)Deta＝Tmax-TL；
(6) Analyzing the quality of the output electric energy of the frequency converter to be tested: in the testing process of the step 1, the step 2 and the step 3, recording voltage, current and frequency data of a group 2 probe of the electric energy quality analyzer and generating a curve, wherein the curve can objectively reflect output power, power factor, voltage spectrum and current spectrum and is used for evaluating whether the output electric energy quality of the frequency converter to be tested meets the requirement;
(7) the calculation process of the energy conversion efficiency of the frequency converter to be tested comprises the following steps: calculating mechanical power P output by the motor to be measured according to the torque and the rotating speed of the motor to be measured in real timem＝2π*n*TLV. (60 x 1000), where TLIn units of Nm, PmIn kW and n in rpm. Calculating input active electric power P by using real-time data of input voltage and current of group 1 probe of electric energy quality analyzerin＝Uin*Iin*cosφinThe energy conversion efficiency η is 100% Pm/Pin；
(8) And (3) loss calculation process of the frequency converter to be tested: calculating the output active electric power P of the frequency converter to be tested by using the real-time data of the output voltage and the current of the 2 nd group of probes of the electric energy quality analyzerout＝Uout*Iout*cosφoutThen the loss power P of the frequency converter to be testedLost_inv＝Pin-Pout；
(9) And (3) calculating the loss of the motor to be tested: motor loss P to be measuredLost_motor＝Pout-Pm；
(10) Storing test data and drawing a curve: all test process data is stored in a memory for access and export by an external computer, and one or more data variable names can be manually selected on the display touch screen to display the test process curve of the selected variable.
The invention has the beneficial effects that: the test system and the test method for comprehensively evaluating the control performance of the frequency converter analyze the control precision of the rotating speed and the torque of the frequency converter, the dynamic response speed, the energy conversion efficiency and the loss and generate a test evaluation report by measuring and storing the input and output electric energy data, the rotating speed of the driven motor shaft and the torque data in the starting and steady-state operation processes of the frequency converter in real time, realize comprehensive and objective evaluation on the control algorithm and the product performance, guide the development process of the frequency converter and improve the production quality level.
Description of the drawings:
FIG. 1 is a schematic diagram of a test system for comprehensively evaluating the control performance of a frequency converter in accordance with the present invention;
fig. 2 is a flowchart of a testing method for comprehensively evaluating the control performance of the frequency converter according to the present invention.
The specific implementation mode is as follows:
the following detailed description of the preferred embodiments of the present invention, taken in conjunction with the accompanying drawings, will make the advantages and features of the invention more readily understood by those skilled in the art, and thus will more clearly and distinctly define the scope of the invention.
As shown in fig. 1, a test system for comprehensively evaluating control performance of a frequency converter includes an asynchronous motor 1 to be tested, a frequency converter 2 to be tested, an accompanying asynchronous motor 3, an accompanying frequency converter 4, a three-phase voltage regulator 5, a torque and rotation speed sensor 6 with a communication function, an electric energy quality analyzer 7 with a communication function, and a display touch screen 8 with a communication interface, wherein the asynchronous motor 1 to be tested and the accompanying asynchronous motor 3 are respectively connected with the torque and rotation speed sensor 6 through a coupler 9, the asynchronous motor 1 to be tested and the accompanying asynchronous motor 3 adopt the same shaft diameter and shaft center height, the frequency converter 2 to be tested is connected with the asynchronous motor 1 to be tested, the accompanying frequency converter 4 is connected with the accompanying asynchronous motor 3, the voltage regulator 5 is respectively connected with the frequency converter 4 to be tested and the electric energy quality analyzer 7, the asynchronous motor 1 to be tested is connected with the electric energy quality analyzer 7, and the power quality analyzer 7 and the torque and rotation speed sensor 6 are respectively connected with a display touch screen 8.
As shown in fig. 2, a test method for comprehensively evaluating the control performance of a frequency converter, which adopts the test system, includes the following steps:
(1) electrifying, and establishing communication connection between the display touch screen and the torque and rotation speed sensor as well as the power quality analyzer;
(2) setting the running frequency of the frequency converter to be tested, starting a data recording function of a display touch screen, starting the frequency converter to be tested, and starting a no-load starting characteristic test;
(3) the frequency converter to be tested enters a stable state, data recording is stopped, the frequency converter to be tested is stopped, and no-load starting characteristic test of one frequency point is completed;
(4) the system judges whether all the set frequencies to be tested are tested, if so, the next step is carried out, and if not, the step (2) is carried out;
(5) setting the output load torque of the accompanying frequency converter, starting the accompanying frequency converter, and starting a data recording function of the touch screen;
(6) setting the running frequency of the frequency converter to be tested, starting the frequency converter to be tested, and starting the on-load starting characteristic test;
(7) the frequency converter to be tested enters a stable state, data recording is stopped, the frequency converter to be tested is stopped to be tested, and the test of the on-load starting characteristic of one frequency point and one load transfer point is completed;
(8) the system judges whether all the set frequencies to be tested and the load torque are tested, if so, the next step is carried out, and if not, the step (5) is carried out;
(9) setting the running frequency of the frequency converter to be tested, setting the load torque of the accompanying frequency converter to be 0, starting a data recording function of the touch screen, and starting the accompanying frequency converter and the frequency converter to be tested in sequence;
(10) the frequency converter to be tested enters steady state operation, and the load torque step change of the accompanying frequency converter is set;
(11) the frequency converter to be tested responds to the load torque and enters steady state operation again, the frequency converter to be tested and the frequency converter to be tested are stopped from being tested, the data record of the touch screen is stopped from being displayed, and the dynamic response test of a data transfer point is completed;
(12) and (4) judging whether all the set frequencies to be tested and the load torque are tested, if not, returning to the step (9).
In order to more clearly express the present invention, the present invention will be further described with reference to examples.
Firstly, a test system (test platform) is built, and two 660V 90kW motors are used, wherein one motor is used as a motor to be tested driven by a frequency converter to be tested, and the other motor is used as an accompanying motor driven by an accompanying frequency converter. The two motors are connected by a coupling and a rotating speed torque sensor.
The method comprises the steps of connecting a frequency converter to be tested and a motor to be tested, connecting a test-accompanying frequency converter and a test-accompanying motor, installing an electric energy quality analyzer, hanging two groups of probes at the input end and the output end of the frequency converter to be tested, connecting a display touch screen, the electric energy quality analyzer and a torque rotating speed sensor, and introducing an auxiliary power supply to the three, so that the touch screen enters a working state, displaying a test initial picture, the electric energy quality analyzer enters a test sampling state, the torque rotating speed sensor is initialized, entering the working state, enabling the analyzer and the sensor to be communicated with the display touch screen, and waiting for the start of a test in readiness.
And a 660V alternating current power supply is introduced into the frequency converter to be tested through the voltage regulator, and a 660V power supply is introduced into the frequency converter to be tested. Inputting the motor parameters to be tested into the frequency converter to be tested, identifying the motor parameters, selecting a control mode (not limited to VF, vector control, DTC control and the like), setting a certain acceleration time for the frequency converter to be tested, setting a certain rotating speed, selecting to start testing on the display touch screen, and displaying that the touch screen starts to record data at the moment. And starting the frequency converter to be tested until the acceleration is finished and the stable operation is achieved, selecting to stop testing on the display touch screen, and stopping recording data, wherein the step is to finish the no-load speed control performance test.
The frequency converter is electrified and started and enters the running state to set the load torque T output by the accompanying motorL＝10％TmaxFrom 0 to fmaxThe set frequency f of the frequency converter to be tested is adjusted in a segmented mannerset，fmaxRated frequency f of motor not limited to 100%e. And selecting to start testing on the display touch screen, and starting recording data by the display touch screen at the moment. Starting the frequency converter to be tested, and testing the frequency converter to be tested at each frequency point with 10% TmaxLoad start and load steady state speed control, torque control performance. Reset TLRespectively 20% Tmax，30％TmaxUp to 100% TmaxAnd testing the on-load starting, steady-state speed control and torque control performances of each frequency point under each load torque.
Keeping the running states of the accompanying frequency converter and the frequency converter to be tested, and adjusting the set frequency f of the frequency converter to be testedset＝10％fmaxAnd the frequency converter to be tested is in steady-state operation from 0 to +/-Tmax、±TmaxChanging the load torque T output by the test-accompanying frequency converter in a step mode from 0 to two directionsLTesting the frequency converter to be tested at 10% fmaxDynamic torque response at frequency. Resetting fsetIs 20% fmax，30％fmaxUp to 100% fmaxAnd testing the dynamic torque response characteristic of the frequency converter to be tested at each frequency point.
Based on the data recorded in the test, the speed control performance index is calculated, and the speed overshoot n in the on-load starting and dynamic torque response test process is calculatedDeta1＝nmax-nsetSteady state deviation nDeta2＝naver-nset. The method is used for measuring the speed control performance of the frequency converter to be measured.
Based on the data recorded by the test, the torque slope time t set by the accompanying frequency converter is referredrFrequency converter to be tested responds to load torque TLAnd reaches the set speed nsetThe time of stabilization is txAnd the torque response time of the frequency converter to be tested is tr1＝tx-tr. Calculating the torque overshoot T by using the data recorded in the testDeta＝Tmax-TL。
And calculating the content of each sub-voltage harmonic wave and current harmonic wave under each test condition based on the data recorded by the test so as to evaluate the output power quality of the frequency converter to be tested.
Based on the data recorded in the test, calculating the mechanical power P output by the motor to be tested under each test conditionm＝2π*n*TL(60 x 1000), inputting active electric power P to the frequency converter to be measuredin＝Uin*Iin*cosφinIf the energy conversion efficiency eta of the frequency converter to be tested is 100%. Pm/Pin。
Based on the data recorded in the test, calculating the output active electric power P of the frequency converter to be tested under each test conditionout＝Uout*Iout*cosφoutThen the loss power P of the frequency converter to be testedLost_inv＝Pin-Pout。
Based on the data recorded in the test, the loss power P of the motor to be tested under each test condition is calculatedLost_motor＝Pout-Pm。
It should be noted that, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "disposed," "provided," and the like in the description of the embodiments of the present invention are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (6)
1. A test system for comprehensively evaluating the control performance of a frequency converter is characterized in that: including the asynchronous motor that awaits measuring, the converter that awaits measuring, accompany the asynchronous motor of trying on, accompany the converter of trying on, voltage regulator, torque speed sensor, electric energy quality analysis appearance and demonstration touch-sensitive screen, the asynchronous motor that awaits measuring, accompany the asynchronous motor of trying on and be connected with torque speed sensor through the shaft coupling respectively, and await measuring the asynchronous motor, accompany the asynchronous motor of trying on and adopt the same diameter of axle and axle center height, the converter that awaits measuring is connected with the asynchronous motor that awaits measuring, accompany the converter of trying on and be connected with accompanying the asynchronous motor of trying on, the voltage regulator is connected with the converter that awaits measuring, electric energy quality analysis appearance respectively, torque speed sensor is connected with the demonstration touch-sensitive screen respectively.
2. The test system for comprehensively evaluating the control performance of a frequency converter according to claim 1, characterized in that: the accompanying frequency converter performs closed-loop control on the accompanying asynchronous motor by accessing a shaft encoder speed signal, and realizes 0-1.5 times rated torque output within the range from zero speed to rated rotating speed.
3. The test system for comprehensively evaluating the control performance of a frequency converter according to claim 1, characterized in that: the frequency converter to be tested realizes constant-torque loaded starting and dynamic variable-torque constant-speed control by driving the asynchronous motor to be tested.
4. The test system for comprehensively evaluating the control performance of a frequency converter according to claim 1, characterized in that: the display touch screen objectively and quantitatively evaluates the control performance of the frequency converter to be tested through input and output variable curves, a speed control performance report, a torque control performance report, an electric energy quality analysis report, an electric energy conversion efficiency analysis report, a motor loss analysis report and a frequency converter loss analysis report generated in the test process.
5. The test system for comprehensively evaluating the control performance of a frequency converter according to claim 4, characterized in that: the display touch screen is connected with the torque rotating speed sensor and the electric energy quality analyzer through communication, measures rotating speed of the asynchronous motor to be measured, torque on a shaft, and voltage, current, frequency and harmonic frequency spectrums of the input end and the output end of the frequency converter to be measured, stores and draws curves, and evaluates speed control accuracy, torque output capacity, input and output voltage, current and frequency characteristic curves of the frequency converter to be measured;
the method comprises the steps that a display touch screen evaluates static constant torque starting and steady-state operation control performance of a frequency converter to be tested to obtain actual speed in a steady state, a rotating speed curve in a starting process and a rotating speed curve in a steady-state operation process are recorded, and a speed control performance report of the frequency converter to be tested is generated;
displaying the time and the amplitude of the load torque output by the accompanying frequency converter and the accompanying asynchronous motor established in the starting process and the steady-state operation process of the frequency converter to be tested measured by the touch screen, recording the torque curves in the starting process and the steady-state operation process, and generating a torque control performance report of the frequency converter to be tested;
displaying output voltage, current and harmonic frequency spectrums of the touch screen in the starting process and the steady state operation process of the frequency converter to be measured, recording voltage, current and harmonic frequency spectrum curves in the starting process and the steady state operation process, and generating an output electric energy quality analysis report of the frequency converter to be measured;
the method comprises the steps that a display touch screen calculates the output mechanical power of a frequency converter to be tested in real time by measuring the torque and the rotating speed of an asynchronous motor to be tested driven by the frequency converter to be tested, calculates the input side electric power of the frequency converter to be tested in real time by measuring the voltage and the current of the inlet side of the frequency converter to be tested, and generates an analysis report of the electric energy conversion efficiency of the frequency converter to be tested according to the input side electric power of the frequency converter to be tested and the mechanical;
the display touch screen calculates the mechanical power of the motor in real time by measuring the torque and the rotating speed of the asynchronous motor to be measured, calculates the input electric power of the motor in real time by measuring the voltage and the current of the asynchronous motor to be measured, calculates the loss of the motor by inputting the electric power and outputting the mechanical power, and generates a motor loss analysis report;
the display touch screen calculates the input side electric power of the frequency converter to be measured in real time by measuring the voltage and the current of the inlet side of the frequency converter to be measured, calculates the output side electric power of the frequency converter to be measured in real time by measuring the voltage and the current of the output side of the frequency converter to be measured, calculates the loss of the frequency converter to be measured by measuring the input side electric power and the output side electric power of the frequency converter to be measured, and generates a frequency converter loss analysis report.
6. A test method for comprehensively evaluating the control performance of a frequency converter by using the test system according to any one of claims 1 to 5, characterized by comprising the steps of:
(1) electrifying, and establishing communication connection between the display touch screen and the torque and rotation speed sensor as well as the power quality analyzer;
(2) setting the running frequency of the frequency converter to be tested, starting a data recording function of a display touch screen, starting the frequency converter to be tested, and starting a no-load starting characteristic test;
(3) the frequency converter to be tested enters a stable state, data recording is stopped, the frequency converter to be tested is stopped, and no-load starting characteristic test of one frequency point is completed;
(4) the system judges whether all the set frequencies to be tested are tested, if so, the next step is carried out, and if not, the step (2) is carried out;
(5) setting the output load torque of the accompanying frequency converter, starting the accompanying frequency converter, and starting a data recording function of the touch screen;
(6) setting the running frequency of the frequency converter to be tested, starting the frequency converter to be tested, and starting the on-load starting characteristic test;
(7) the frequency converter to be tested enters a stable state, data recording is stopped, the frequency converter to be tested is stopped to be tested, and the test of the on-load starting characteristic of one frequency point and one load transfer point is completed;
(8) the system judges whether all the set frequencies to be tested and the load torque are tested, if so, the next step is carried out, and if not, the step (5) is carried out;
(9) setting the running frequency of the frequency converter to be tested, setting the load torque of the accompanying frequency converter to be 0, starting a data recording function of the touch screen, and starting the accompanying frequency converter and the frequency converter to be tested in sequence;
(10) the frequency converter to be tested enters steady state operation, and the load torque step change of the accompanying frequency converter is set;
(11) the frequency converter to be tested responds to the load torque and enters steady state operation again, the frequency converter to be tested and the frequency converter to be tested are stopped from being tested, the data record of the touch screen is stopped from being displayed, and the dynamic response test of a data transfer point is completed;
(12) and (4) judging whether all the set frequencies to be tested and the load torque are tested, if not, returning to the step (9).
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| CN202011344036.3A CN112649729A (en) | 2020-11-26 | 2020-11-26 | Test system and test method for comprehensively evaluating control performance of frequency converter |
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