This paper presents the analysis, development, and implementation of a new controller for micro-grid systems. The developed controller is structured to produce command values for the active and reactive powers (P C  and Q C ), and d−q-axis voltage components (v dC  and v qC ) for each bus in the micro-grid system at hand. Values for P C , Q C , v dC , and v qC  are obtained using a power flow formulated in the d−q-axis frame. The d−q-axis power flow (DQPF) produces values for P C ,Q C , v dC , and v qC  that can meet load demands, respond to variations in power generation within the micro-grid, and accommodate the mode of operating the micro-grid (interconnected or stand-alone), while maintaining the voltage and frequency stability. The DQPF-based controller is implemented for performance evaluation using a 5-bus micro-grid system operated under various conditions, including changes in power generation, step changes in load demands, and changes in mode of operation. Test results demonstrate that the DQPF-based controller can offer simple implementation, accurate and fast responses, and negligible sensitivity to the mode of micro-grid operation.
['S. A. Saleh']
The development of a power flow-based controller for micro-grid systems