Abstract
In an islanded microgrid, the reactive power needed to support the voltage regulation could not be shared among distributed generators (DGs) accurately when those conventional droop control scheme is imposed, due to the effects of mismatched feeder impedance of DGs parallel operation. Meanwhile, the conventional droop control scheme can not achieve satisfied voltage recovery performance at the point of common coupling (PCC) when inner reactive loads fluctuate sharply. To realize accurate reactive power sharing and voltage regulation, an improved control strategy for DGs parallel operation is proposed in this paper. The main characteristics of the control strategy include: 1) Fully decentralized and hierarchical control structure is presented, i.e. the reactive power sharing error can be reduced in the primary control layer and the voltage regulation can be achieved in the secondary control layer without the microgrid centralized controller (MGCC) and communication networks; 2) both fast dynamics and steady state characteristics of microgrid are satisfactory; and 3) DGs can have complete plug&play characteristics. Simulation results verify the effectiveness of the proposed control strategy.
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