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An improved Reactive Power Control Strategy for Inverters in Microgrids

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سال انتشار : 2012

نوع مقاله : IEEE CONFERENCE PUBLICATIONS

تعداد صفحات : 6

Abstract

Abstract—Due to the different system impedance, the

conventional droop control scheme cannot achieve accurate

sharing and control of reactive power among voltage-source

inverters (VSIs) in microgrid (MG). In this paper, a new droop

control strategy is proposed to raise the accuracy of the reactive

power control. Firstly, the strategy eliminates the conventional

droop for the reference voltage of the VSI under no load, and the

reactive power is left to be actually shared among VSIs based on

the truth that the inductive system impedance presents a natural

droop characteristic as the output of reactive power increases.

Secondly, a virtual inductance is introduced to make the whole

system impedance predominantly inductive even in a low-voltage

network with resistive line impedance, preventing the coupling

between the real and reactive power and suppressing the

circulating current quickly among paralleled VSIs. Finally, a

voltage amplitude droop loop with zero steady-state error control

is employed at the point where the VSI system is connected to the

MG based on the fact that the whole ac bus has approximately

the same voltage amplitude in well-regulated or small-scale MGs.

The proposed strategy can effectively improve the reactive power

sharing and control accuracy. Simulation and experimental

results are given to validate the proposed strategy.

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