THREE-PHASE ACTIVE ELECTRIC FILTER Russian patent published in 1998 - IPC

FIELD: electrical engineering; converter engineering; off-line power systems. SUBSTANCE: filter has input data conversion system 1 incorporating adapter whose inputs are connected to supply mains phases A, B, C and output, to analog-to-digital input of single-chip computer. Storage unit is connected to single-chip computer which is connected through buffer stage to inputs of devices controlling storage of multiple-range pulse modulation unit 6. Inputs of pulse power amplifiers are connected through buffer stages to storage control outputs of devices connected to storage units and their outputs are loaded into auxiliary coils of LC filter chokes. LC filters are connected to phases A, B, C of load supply mains. EFFECT: improved characteristics of electric energy generated by off-line power systems due to reducing higher harmonics of voltage components in ac circuits handling high-power nonlinear loads. 1 dwg