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—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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