Stand-alone AC/DC Converter for Multiple Inverter Applications

The complete ACiAC converter systems are finding its use in applications where the high dynamic operation with load energy regeneration is required. Since the ACiAC con- verter features unity input displacement factor and the input currents exhibit very low harmonic distortion, another appli- cation area of the complete AC/AC systems is in the environ- ment where the low harmonic impact on the utility is required. Due to the relatively high cost of the complete configuration today, a promising application area where these systems could become cost effective are the multi-inverter systems. This paper investigates on such multi-load application in which the single AC/DC converter feeds several inverters through the common DC bus. The paper provides analysis of the ACiDC converter operation, considerations about control design, advantages and limitations of such multiple inverter arrange- ment. The complete simulation and experimental results are reported for a 7.5kW prototype of a multi-load system.