Processing methods for separately adjusting voltage and frequency of frequency converter
A technology of frequency adjustment and processing method, which is applied in electrical components, AC motor control, conversion equipment for intermediate conversion to DC conversion, etc. Effect
Inactive Publication Date: 2011-04-27
GUANGZHOU WEIDALI ELECTRICAL APPLIANCE
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Problems solved by technology
Because its V / F curve is fixed, it is mainly used to drive a fixed load motor, but it cannot meet the requirements in the application of motor test. The motor test is aimed at different motors, and there are various motors to be tested. Each motor The model, power, voltage level, rated frequency, speed and other parameters may be different, and in addition to the no-load test, the test motor also needs to do overspeed test, stall test and other tests, so there is an urgent need for a motor that can achieve voltage and Inverter with separate frequency adjustment to meet the needs of motor testing, variable frequency power supply and other systems
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[0028] refer to figure 1 , a processing method for voltage regulation of a frequency converter, comprising the following steps:
[0029] S101. Select the control mode of the inverter. The inverter has two control modes: bus control mode and external terminal control mode;
[0030] S102. If the frequency converter is in the bus control mode, read in the process input data, and then execute S104;
[0031] S103. If the frequency converter is in the external terminal control mode, read in the analog input data, and then execute S104;
[0032] S104. Enter the speed change limiting unit to limit the voltage regulation change rate;
[0033] S105. Judging whether the frequency converter is in a deceleration stop state;
[0034] S106. If the frequency converter is not in the deceleration stop state, convert the input data into a reference voltage value;
[0035] S107. If the frequency converter is in the deceleration stop state, keep the original reference voltage value unchanged. ...
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The invention discloses processing methods for separately adjusting voltage and frequency of a frequency converter, which comprise a processing method of voltage adjustment and a processing method of frequency adjustment, wherein the processing method of the voltage adjustment comprises the following steps of: selecting a control mode; reading external data; limiting voltage-adjusting speed changes; judging whether the frequency converter is in a speed-down stopped state; if the frequency converter is not in the speed-down stopped state, converting input data into a voltage reference value; and if the frequency converter is in the speed-down stopped state, keeping the original voltage reference value unchanged. By separately adjusting the voltage and the frequency, the intrinsic slope coefficient of a V / F working curve of the frequency converter can be changed, the requirements on driving different load motors in a motor test are met, and a motor locked-rotor test is performed in the motor test; and the processing methods can also be applied to variable-frequency power sources to realize frequency fixing and voltage adjustability. The processing methods make application range of the frequency converter more widely.
Description
technical field [0001] The invention relates to a method for adjusting and processing a frequency converter, in particular to a method for adjusting and processing the voltage and frequency of a frequency converter. Background technique [0002] The frequency conversion speed controller is referred to as the frequency converter. Through the transformation of "AC-DC-AC", the input three-phase AC power is firstly rectified into DC power through the rectifier unit, filtered by the filter capacitor, and then the DC power is inverted into a variable frequency by the inverter unit. Adjustable three-phase alternating current to realize motor speed regulation. The V / F curve (that is, the voltage / frequency curve) of the ordinary inverter is constant, and the voltage changes according to the preset V / F curve. The voltage is changed at the same time as the frequency conversion, that is, the ratio of V / F remains unchanged. Because its V / F curve is fixed, it is mainly used to drive a fi...
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IPC IPC(8): H02M5/40H02P27/06
Inventor 石伟劭利新辉
Owner GUANGZHOU WEIDALI ELECTRICAL APPLIANCE