INDEPENDENT LOAD SHARING OF AC POWER SYSTEMS CONNECTED IN PARALLEL

摘要

A parallel redundant power supply system (10) which does not use any inter-unit signaling is obtained by using the AC output power level of a power system (10) to coordinate load (2) sharing. The necessary information for load (2) sharing is derived solely from each power system's (10) output power level in such a manner that the output of a power system (10) is inherently phase locked to the output of other power systems (10) to which it is connected in parallel. Each parallel connected power system (10) designed in accordance with the invention includes means for generating an AC output voltage from a DC input power source (3), means for sampling either a DC input voltage from the DC input power source (3) or the AC output voltage from the generating means to provide power level samples, and means for determining the AC output power of the AC output voltage generating means from the power level samples.