Method and system for detecting open phase
A phase loss detection and phase loss technology, applied in electrical components, emergency protection circuit devices, etc., can solve the problems of general inverter phase loss detection and protection methods are no longer effective, power does not pass through rectifier circuits, and motor control algorithms are complex. , to achieve the effect of simple and effective software implementation, strong practicability and low cost
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[0064] Embodiment 1: Brushless doubly-fed motor control system such as figure 1 , combined with the special structure and control requirements of the brushless doubly-fed motor control system, this method divides the phase loss detection on the power side of the brushless doubly-fed motor into three steps:
[0065] The first step is the voltage phase loss detection of the high-voltage input power supply on the power side. This detection can be carried out after the control system of the brushless double-fed motor is powered on, and there is no need to power on the body of the brushless double-fed motor.
[0066] The second step is to detect the lack of phase of the power winding current before the operation of the brushless doubly-fed motor. Before the start of the brushless doubly-fed motor, the detection is carried out by closing the power switch of the power winding and energizing the power winding.
[0067] The third step is the phase loss detection during the operation of...
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