Voltage space vector PWM (pulse width modulation) control method based on three-phase independent H-bridge drive circuit
A voltage space vector, bridge drive circuit technology, used in vector control systems, motor generator control, AC motor control, etc.
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[0047] In the present invention, according to the operating principle of the three-phase independent H-bridge drive circuit, the three working modes of a single H-bridge are equivalent to "1", "-1" and "-1" respectively. 0". According to the switching modes of the three H-bridges, a total of 27 working states can be combined, and 27 voltage space vectors can be obtained, and vectors with small amplitude and physically unrealizable are excluded, and 14 basic voltage space vectors are selected, including 6 Long vector, 6 short vectors and 2 zero vectors.
[0048] According to the 14 basic voltage space vectors, the regular hexagonal voltage space vector trajectory is formed. The inscribed circle of the regular hexagon is the voltage vector circle required for AC motor voltage space vector PWM control, and the radius of the circle is the basic voltage space vector. the maximum magnitude of short and medium vectors;
[0049] The voltage vector circle is divided into 12 sectors f...
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