| 摘要 |
A cascade multilevel frequency converter comprises in every output phase three series-connected convertors, every convertor comprising four keys, two sources, voltages of which equal correspondingly to U=3U and U=6U connected to DC diagonal of second and third converters, free ends of AC diagonal of the first and the last convertors form correspondingly a start and termination of frequency converter phase, phase starts of which are connected one to another, phase terminations are meant for load connection, an electric motor control system, a function generator, an adder, a digitizer, first ends of the electric motor control system where sine signals of preset amplitude and frequency are shaped, a shift between signals for three-phase frequency converter is 2&pgr;/3 are connected to second input of the adder. Additionally, a control pulse former, a voltage regulator, a capacitor in a diagonal of first convertor are incorporated in every phase. |
