Abstract: A system and method for synchronizing a utility grid and a microgrid including a diesel generator, a photovoltaic array and a wind turbine. In a grid connected mode, a microgrid voltage, a microgrid frequency and a microgrid phase angle are controlled by a grid side converter which generates a preset reference power at the utility grid frequency; and provides a real power and a reactive power to each of a plurality of loads. In an island mode, the diesel generator operates at a constant speed to generate power at the reference frequency and communicates the reference frequency to a wind turbine, and the microgrid supplies the real power and reactive power to each of the plurality of loads. In a resynchronization mode, a switched capacitor bank is charged to provide the voltage needed to reconnect the microgrid to the utility grid.

Abstract: A system for efficient power management control includes a microgrid, a primary electrical grid, a first control unit, a second control unit, and a third control unit. The microgrid, which is an active load based microgrid, is electrically coupled with the primary electrical grid in grid-connected mode and includes at least one photovoltaic (PV) array, at least one battery, and at least one generator. The first control unit is used to manage the at least one PV array. The second control unit is used to manage the at least one battery. The third control unit is used to control the at least one generator. In grid-connected mode, a system frequency and voltage supplied to the active load is regulated by the primary electrical grid. During a fault in island mode, the at least one generator controls the system frequency and voltage.

Abstract: The method of repairing financially infeasible genetic algorithm chromosome encoding activity start times in scheduling problems determines cash availability during a given period, identifies all possible activities' schedules, determines the cash requirements for each schedule, ranks schedules based on the contribution on minimizing the increase in the project duration, schedules all activities of the selected schedule, and determines the impact of the scheduled activities on the project cash flow. Thus, the algorithm introduces effective chromosomes that maximize the utilization of the available funds and minimize project duration.