Open-circuit fault diagnosis method of three-phase four-wire system inverter transistor
A three-phase four-wire system, open-circuit fault technology, applied in the direction of single semiconductor device testing, etc., can solve the problems of diagnosis speed and robustness to be improved, the inverter cannot be used, and the diagnosis time is long, so as to avoid hardware circuits and The effect of software burden, small amount of calculation, and rapid diagnosis
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[0043] In order to describe the present invention more specifically, the technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0044] Such as figure 1 As shown, the three-phase four-wire inverter power tube open circuit fault diagnosis method of the present invention includes the following steps:
[0045] S1. Obtain a signal for diagnosis from the control system.
[0046] In typical three-phase four-wire inverter applications, such as grid-connected inverters and uninterruptible power supplies, the output phase current (i A i B i C ), output phase voltage (v AO , v BO , v CO ), DC bus voltage V dc and divider capacitor voltage V C1 It will be collected and sent to the control system to realize functions such as closed-loop operation and protection; the controller calculates the pulse duty ratio (d A 、d B 、d C ), so as to control the operation of the inverter; in the co...
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