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A novel control strategy of parallel connected inverters in microgrid

With the use of large amount of distributed generation(DG), the control strategy of inverter has become a hot area of research, which plays an important role in the microgrid stability. A control strategy combined droop control with PI control is proposed, in which the frequency and amplitude of output voltage is generate according to active and reactive power and the error between the output current and reference current is eliminated. Using this strategy can achieve seamless mode transfer. The simulation results show that the control strategy is valid under island and grid-connected mode.