Method for improving double-fed converter low voltage ride through performance
A low-voltage ride-through, converter technology, applied in the direction of single-grid parallel feeding arrangement, etc., can solve the problems of mechanical shaft vibration, system instability, system power mutation, etc.
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[0045] specific implementation
[0046] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0047] Three-phase general-purpose inverter electrical topology such as figure 2 As shown, by the DC bus U dc , S aup , S adn composed of phase A bridge arm, S bup , S bdn composed of phase B bridge arm, S cup , S cdn Composed of C-phase bridge arm, three-phase series inductor L a , L b , L c and load U s Composition, V ca , V cb , V cb Output three-phase voltage for the inverter, V sa , V sb , V sc is the load three-phase voltage.
[0048] As described below, the present invention controls the grid-side converter and the motor-side converter respectively:
[0049] The control method of the present invention for the power grid side converter is as follows:
[0050] (1) When the program is initialized, set I according to the capacity of the converter goc1 , I goc2 two current thresholds, and...
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