Cooperative Control and Power Management for Islanded Residential Microgrids with Local Phase-wise Generation and Storage Units

A cooperative control and management strategy for islanded residential microgrids is presented in this paper. In addition to the loads, PV generation and battery storage are considered within each phase using droop control schemes. The proposed strategy uses a two-tiered management scheme to coordinate intraand inter-phase power management. Each intraphase control relies on a modified vector control with a multisegment (P/f) droop strategy to balance the generation, load and potential power transfer among other two phases. The inter-phase management only comes into play when there is an imbalance among phases so that desirable power can be transferred to the phases with deficiencies. This is accomplished by back-toback converters connecting the phases. PSCAD/EMTDC has been used to investigate the performance of the proposed strategy. It is interesting to observe that when extra power is needed in one particular phase, the desired amount is transferred through the back-to-back converters from other phases. As a result, the balance for voltage, frequency, and power can be achieved at both the phase level and the system level.