Variable-frequency power source device of controllable rectification unit
A technology of rectifier unit and variable frequency power supply, which is applied in the direction of output power conversion device, AC power input conversion to AC power output, electrical components, etc. It can solve the problems of motor terminal voltage rise and other problems, reduce voltage peak value, improve test ability, Protects against shock effects
Inactive Publication Date: 2013-03-13
SHANGHAI MOTOR SYST ENERGY SAVING ENG TECH RES CENT +1
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Problems solved by technology
[0003] This kind of test power supply system can complete the superimposed frequency temperature rise test of asynchronous motor very well, but since the motor works in the motor-generating state, as the load current increases, the DC bus voltage has a process of gradually rising, and the motor terminal voltage corresponding step up
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[0013] Embodiments of the present invention are further described below in conjunction with the accompanying drawings:
[0014] In order to make the frequency conversion test power supply device more perfect for the overlapping frequency test of the motor under test, the stability of the power supply device is improved and the cost of the power supply is further reduced under the premise of ensuring its test capability. The present invention is characterized in that the main control unit is no longer limited to the control of the inverter unit, but adopts the coordinated control of the rectification and inverter units, and collects the output side voltage of the variable frequency power supply as a feedback signal to control the silicon controlled rectifier. The rectification unit adopts a silicon controlled rectifier, and the capacity of the silicon controlled rectifier is 10-10000kW. The inverter unit is a three-phase inverter with a capacity of 50-10000kW. In the process o...
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Disclosed is a variable-frequency power source device of a controllable rectification unit. The device comprises a main control unit, an inverter unit, a rectification unit and an energy-storage capacitor. The variable-frequency power source device of the controllable rectification unit is characterized in that the rectification unit is a silicon controlled rectifier, an output end of the rectification unit is connected with the energy-storage capacitor, the rectification unit is connected with a motor to be tested through the inverter unit, and the main control unit is respectively connected with control electrodes of the rectification unit and the inverter unit. The variable-frequency power source device of the controllable rectification unit has the advantages that during motor superposing-frequency test, the terminal voltage of the motor to be tested is increased caused by the imposing of a side-frequency power source, when the main control unit detects a signal that the terminal voltage of the motor exceeds the nominal voltage, the output voltage of the rectification unit can be automatically adjusted, the output voltage of the variable-frequency power source is decreased to reach to the nominal voltage value and keep stable, simultaneously the direct current bus voltage peak value is decreased, the energy-storage capacitor can be protected from being impacted, the test capability of the power source can be improved, and the cost is lowered.
Description
technical field [0001] The invention relates to a power testing device, in particular to a frequency conversion power supply device of a controllable rectification unit. Background technique [0002] With the improvement of the rated capacity and the diversification of the types of asynchronous motors, in view of the limitation of test conditions, more and more motor temperature rise tests are carried out by overlapping frequency test method. In the selection of frequency superimposed test power supply, benefiting from the maturity of frequency conversion technology, frequency conversion test power supply is mostly used at present. It can be known from the basic principle of overlapping frequency test that when conducting the test, the power supply needs to provide the motor under test equal to U=U 1 sin(ω 1 t+θ 1 )+U 2 sin(ω 2 t+θ 2 ) in the form of waveforms, so that the motor under test is cyclically working in the motoring and generating states, so as to achieve th...
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IPC IPC(8): H02M5/458
Inventor 冯东升吴汉熙王涛陈叶荣
Owner SHANGHAI MOTOR SYST ENERGY SAVING ENG TECH RES CENT