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CONTROL METHOD OF A THREE-PHASE DC/AC ELECTRONIC CONVERTER WITH FAILURE IN ONE PHASE
ES2735639
A control method of a three-phase DC/AC electronic converter connected to an electrical network is disclosed, in which one or two switches of the same phase are faulty. The converter has an input voltage (Vcc) and an output voltage vector ((vector v)ref) whose possible vectors before the fault define a hexagon and after the fault define a rhombus. The method comprises reconstructing and stabilizing a hexagon formed by six spatial vectors at 60º from the four available spatial vectors after the fault, which allows modulation by means of a conventional "SVM" spatial vector modulator of the output vector of the converter ((vector v)ref). The method takes into account the voltage variations on the DC bus of the electronic converter to stabilize the regular hexagon.
The control method of a three-phase DC/AC electronic converter with a fault in one phase of the present invention is aimed at a three-phase DC/AC electronic converter comprising a DC bus formed by at least two capacitors "C1" and "C2 " in series. The control method of a three-phase DC/AC electronic converter with a fault in one phase of the present invention comprises: - connect the failed phase of at least one switch to the midpoint of the DC bus formed between capacitors C1 and C2; - measuring voltage vectors V00, V01, V10 and F1 :L, generated by the three-phase DC/AC converter when the three-phase electronic DC/AC converter has a failure of at least one switch in one phase; - calculate a voltage vector V by applying the voltage vector F00 during the % of the period defined as dVoo; - calculate a voltage vector V2 by applying the voltage vector V00 during the % of the period defined as dVoo and the voltage vector V10 during the % of the period defined as dv1º; - calculate a voltage vector V3 by applying the voltage vector F10 during the % of the period defined as dVio and the voltage vector í^ 11 during the % of the period defined as dv11 ; - calculate a voltage vector V4 by applying the voltage vector during the % of the period defined as dVi i ; - calculate a voltage vector V5 by applying the voltage vector í 1^ 1 during the % of the period defined as dVi i and the voltage vector V01 during the % of the period defined as dVoi; - calculating a voltage vector V6 by applying the voltage vector V01 during the % of the period defined as dVoi and the voltage vector V00 during the % of the period defined as dVoo; - reconstruct a hexagon formed by the vectors V3 and Vs; - perform a modulation of the vre/ vector as
A control to convert DC/AC accurately and efficiently.