An Overlap-Time Effect Elimination SVM Based on Vector Bridge Extension for Current-Source Converter

In order to effectively eliminate the overlap-time effect introduced by the addition of the overlap time in the space vector modulation (SVM), an overlap-time effect elimination SVM method based on vector bridge extension is proposed for current source converter (CSC). This article first selects the current vector as the bridge vector according to the ac side voltage relationships, and then uses the bridge vector to add the overlap time to the other two current vectors by bridge extension method, which make the dwell time of active vector the same as the ideal dwell time and the overlap-time effect can be directly eliminated without any compensation. In addition, by rearranging the order of the vectors, the number of switching times is reduced. Thus, this method sets the overlap time within the modulation, which is different from the traditional SVMs. The output current is the same as that of the ideal SVM, which can improve the harmonic performance of currents. Finally, the simulation and experimental results show that the proposed method can effectively eliminate the overlap-time effect.