A converter test bench load automatic switching control method and test device
A technology of automatic switching and control methods, which is applied in the field of converter testing, can solve the problems of increasing test process time, low frequency of use of load groups, and high frequency of load use, so as to improve the reliability of equipment use, prolong the service life of loads, The effect of reducing the intensity of operation
Active Publication Date: 2021-12-24
ZHUZHOU CSR TIMES ELECTRIC CO LTD
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Problems solved by technology
This operation greatly increases the workload of the test personnel, increases the time of the test process, and the degree of automation of the equipment is very low
At the same time, there may be multiple load combinations for the same load value, but the testers may not pay special attention to the load combinations, resulting in the use frequency of some load groups is very low, while the frequency of use of some load groups is very high
Unbalanced use of load, which may cause some load groups to be damaged prematurely due to overuse
Method used
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[0039] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0040] Such as Figure 1 to Figure 4 As shown, the load automatic switching control method of the converter test bench in this embodiment includes the following steps;
[0041] Step S01, regard the output end of the PLC controlled load switching as a binary number as the load number, the sum of the load values corresponding to the ON bit in the load number is the load value corresponding to the load number, and the load number and the corresponding load value form a group Load data; according to this principle, list all load numbers and corresponding load values to establish a load table; PLC writes programs in a cyclic structure to realize the establishment of a load table. The load table is a storage area with a power-off memory function, such as figure 2 shown;
[0042] S02. Count and clean the load values in the load table to creat...
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The invention discloses a load automatic switching control method of a converter test bench, comprising the steps of: establishing a load table, a load type value table and a historical load table; searching the corresponding load type value in the load type table; Find the corresponding historical load number; start to search for the load value at the next corresponding load value of the historical load number; expand the load number corresponding to the load value, and gradually input the load value. The invention also discloses a test device, which includes a power supply system, an AC contactor group, a voltage and current sensor, a load group and a control unit. The AC contactor group is connected between the output terminal of the converter and the load; the voltage and current sensor is used for Monitor the voltage and current data; the load group is connected to the output terminal of the tested converter through the AC contactor group; the control unit is used to control the on-off of the AC contactor group. Both the method and the device of the present invention have the advantages of high degree of automation, high test efficiency, guaranteed same load use probability, and the like.
Description
technical field [0001] The invention mainly relates to the technical field of converter testing, in particular to a load automatic switching control method and testing device of a converter test bench. Background technique [0002] The power assessment test is the most important item in the routine factory test items of the converter, which tests the running condition of the converter under load. The power assessment test is to connect the output terminal of the converter power supply to a resistive load with a power factor of 0.85 and run it at full power for a period of time. Due to the various types of converters, and the output power of each type of converter is different, in order to make one test bench meet the power assessment tests of various types of converters, the load of the test bench is generally divided into many groups of small loads. Small loads are combined into large loads to meet the power assessment tests of different types of converters. Although the ...
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IPC IPC(8): G01R31/00G05B19/05
CPCG01R31/00G05B19/054G05B2219/13142
Inventor 凌志辉贺文熊颉陈天喜陈明奎杨韬贺梁赵科龙李超吴连贵尤勇
Owner ZHUZHOU CSR TIMES ELECTRIC CO LTD