| Abstract |
Cycloconverter drives used for low-speed, high-torque a.c. machines such as the rolling mills in the steel industry generate non-integer order harmonics, "interharmonics". Under variable-frequency operation, the interharmonic spectrum also changes. To suppress these harmonics, the application of the active power filter is researched. In order to improve the active power filter's compensation characteristics for interharmonics, a novel scheme for the measurement of the harmonics is proposed. Numerical analysis studies verify that interharmonic currents from a cycloconverter in an industrial drive can be measured fast enough and precisely with this scheme. The measurement scheme is based on the digital signal processing and easily realized with the computer software. |
