Question

A microgrid operating in islanding mode is shown in figure 5. The two generators are rated at 50MVA and 70 MVA. At first, the generators supply power at 50Hz to Loads A, B, and C Under these conditions, Loads A, B and C are each drawing 20MW, while each generator supplies 30MW Later, the fourth load, Load D, is switched on, drawing 30MW. The droop controllers for the generators are set so that each generator supplies the extra power in proportion to the relative rated values of the generators, hence the 70MVA generator will contribute proportionately more to the change than the 50MVA generator. The controllers are also required to limit the change in system frequency to 0.5 Hz. What are the required values of the speed droop coefficients, in units of (MW), for each generator, pi and p2? G, 50MVA G2 70MVA PCC open Load A 20MW Load B 20MW Load C 20MW Load D 30MW

Answer 1

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