| Abstract |
This paper concerns a device for the rapid compensation of the reactive power absorbed by a single-phase load. The philosophy underlying the proposed principle is radically different from the more traditional approaches. The system consists of a current-controlled transistor inverter which can inject into the network the quadrature component of the current absorbed by the load. During the investigation, three twin-state techniques for the on-off control of the current have been identified: fixed frequency, constant transistor shutdown time, constant current ripple. The theoretical and experimental studies conducted so far have identified the last two techniques as the better ones and, in particular, that of the constant ripple. This is because with a given maximum transistor commutation frequency it is possible to inject into the network currents with a lower harmonic content. Faster response and continuity of modulation of the reactive power represent further particular characteristics of the device. In the closing part of the paper we mention briefly the possibilities offered by the use of three-state modulation techniques as well as possible three-phase applications of the proposed system. |
