| Abstract |
This paper deals with the problem of delivering reactive power with small single-phase pulse-width modulation (PWM) inverters. Most of the basic converters being used in small inverters do not allow reverse power flow. Hence, problems are encountered when a non-resistive load is applied. During intervals when the inverter output voltage and output current have an opposite sign, energy is transferred back to the inverter. One has to provide an external path to deviate or absorb this energy, otherwise the inverter output voltage would be seriously distorted. Several solutions have already been proposed to meet this problem and most of these techniques will be discussed in this paper. With the solution we propose, inverter operations with non-resistive loads with high efficiency and small distortion are possible. An inverter of 1500 Watt, based on this principle, bas been realised in our laboratory and can handle reactive loads with power factors of 0.6 with negligible power losses. |
