Three-Resistor Current Sampling Method of Inverter Based on Current Prediction
A current prediction and current sampling technology, which is applied in the field of electrical engineering, can solve the problems of insufficient zero-voltage vector duration and the inability to accurately sample three-phase current, and achieve the effects of low cost, increased load capacity, and improved modulation ratio
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[0028] The present invention will be described in detail below with reference to specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.
[0029]In an embodiment of the present invention: based on a general two-level inverter three-resistor sampling circuit (such as figure 1 shown), to provide a three-resistor current sampling method based on current prediction, the control process is as follows figure 2 shown:
[0030] In each PWM cycle, after current closed-loop PID control and SVGEN modulation, A, B, C three-phase PWM comparison value T is obtained 1 , T 2 and T 3 , the three comparison values represent the conductio...
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