Voltage Profile Improvement in Autonomous AC Microgrid Operated at Constant Frequency and Equivalent Parallel Operation of Inverters

摘要

For an autonomous microgrid operated at constant frequency, the main power quality issue is the voltage profile. In this paper, a fine-tuning of a control coefficient for real power reference generation is proposed. Matlab/Simulink real-time fixed-time-step modelling has been conducted to validate such proposal. It is found that by taking proper tuning, the terminal voltage at each DG can be kept within voltage limit. Furthermore different conventions for denoting reactive power in inverter have been summarized in this paper to clear confusion.