Choice Criteria between AC and DC Bus in a subsystem in the frame of a distributed Power production

Abstract : The aim of the paper is to provide a framework for the evaluation of the operational performance of small electricity spply systems (1−10 kW) that use either AC or DC bus. It is shown that in several cases a better performance can be achieved when generators and loads are connected to a common DC rather than a standard AC bus. The application study is performed for the case of a PV pumping system. The influence of bus and inverter choice is studied, while the distance between solar generator and battery is introduced as a decisive criterion. The paper introduces loss of load, ACDC conversion losses and new economic criteria that permit optimal decisions on the choice between AC or DC bus−bar.