Digital implementation of the space vector modulator for forced commutated cycloconverters

The space vector modulation (SVM) technique for control of forced commutated cycloconverters (FCCs) is a new PWM control technique of FCCs. A digital implementation of the space vector modulator for 3 phase-3 phase FCCs is presented. The FCC SVM is realized in a microprocessor system with reduced real-time computation, because the computation of the SVM switching intervals may be time critical. The SVM switching are precalculated offline and the results are stored in EPROMs. The FCC switch control is implemented on two levels. First, the control signals for the 4QSWs (four quadrant switches) are generated. Secondly, the 4QSW control pulses are transformed into control signals for the corresponding 2QSWs. In particular, the author deals with: the fundamentals of the space vector modulation technique for control for FCCs; the digital implementation of the FCC space vector modulator; the analog simulation of the FCCs; and the experimental verification of the space vector modulator applied for control of a low power FCC (10 A/100 V) laboratory prototype.