Current control device and method of alternating current asynchronous motor
A technology of AC asynchronous motor and current control, which is applied in the direction of AC motor control, motor generator control, electromechanical transmission control, etc., and can solve problems such as asynchronous motor overcurrent
Inactive Publication Date: 2011-04-13
NORTH CHINA UNIVERSITY OF TECHNOLOGY
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Problems solved by technology
In the asynchronous motor speed control system powered by a voltage source inverter, the current controller mainly adopts the PI controller on the synchronous coordinate system. The synchronous PI controller can realize the fixed switching frequency, but in order to avoid the influence of integral saturation, It is necessary to use an anti-saturation PI regulator, causing the asynchronous motor to have overcurrent when the rise time and fall time of the speed control system are small
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[0021] Such as figure 1 As shown, the AC asynchronous motor current control device realized by this control method is characterized in that the current control device includes a DSP-based control board 1, a voltage source frequency converter 2, a current sensor 5, and an AC asynchronous motor 6. The voltage source inverter 2 includes an uncontrolled rectifier bridge 3 and a three-phase full-control inverter bridge 4; the control board 1 generates signals PWM1-PWM6 and is connected to the three-phase full-control inverter bridge 4 in the voltage source inverter 2; The input end of the controlled rectifier bridge 3 is connected to the power grid, the uncontrolled rectifier bridge 3 is connected to the three-phase fully controlled inverter bridge 4 through a capacitor, the current sensor 5 measures the output current of the three-phase fully controlled inverter bridge 4, and the three-phase fully controlled inverter bridge 4 The output end of the variable bridge 4 is connected wi...
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The invention discloses a current control device and a current control method of an alternating current asynchronous motor, which relate to a device and a method for controlling three-phase stator current of the alternating current asynchronous motor. The current control device comprises a digital signal processor (DSP)-based control board, a voltage source type frequency converter, a current sensor and an asynchronous motor, wherein the voltage source type frequency converter comprises an uncontrolled rectifier bridge and a three-phase fully-controlled inverter bridge. The algorithm part of the current control method of the alternating current motor is realized on the basis of a TMS320 series digital signal processor (DSP). Pulse-width modulation (PWM) waves generated by the DSP drive a fully-controlled switching apparatus of the three-phase fully-controlled inverter bridge of the voltage source type frequency converter. The rectification part of the frequency converter adopts the uncontrolled rectifier bridge. In the control method, the amplitude value and the phase of the motor current are controlled through two PI adjustors respectively; the PI adjustors generate a demand signal of a PWM module; the PWM module generates PWM waves; and the motor current is controlled by controlling the stator voltage of the motor.
Description
technical field [0001] The invention relates to an AC asynchronous motor current control device and a current control method, in particular to an AC asynchronous motor current control device and a current control method realized by using a TMS320 series DSP. technical background [0002] At present, most of the vector control speed regulation systems use voltage source inverters to supply power to asynchronous motors, especially asynchronous motors. In the asynchronous motor speed control system powered by a voltage source inverter, the current controller mainly adopts the PI controller on the synchronous coordinate system. The synchronous PI controller can realize the fixed switching frequency, but in order to avoid the influence of integral saturation, It is necessary to use an anti-saturation PI regulator, causing the asynchronous motor to have overcurrent when the rise time and fall time of the speed control system are small. Therefore, it is necessary to find an asynch...
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Login to View More IPC IPC(8): H02P21/12H02P27/08H02P21/14H02P21/22
Inventor 杨立永李正熙樊生文赵仁涛陈智刚王占扩李颖宏孙德辉蒋正荣刘硕
Owner NORTH CHINA UNIVERSITY OF TECHNOLOGY