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title

CONTROL OF ENHANCED VIRTUAL SYNCHRONOUS GENERATOR FOR PARALLEL INVERTERS IN MICROGRIDS

Author(s):

G.Venkatesh

Keywords:

DC-AC power converters, distributed power generation, droop control, microgrids, power control, power sys-tem dynamics, power system modeling, reactive power control, state-space methods, virtual synchronous generator

Abstract

Virtual synchronous generator (VSG) control is a promising communication-less control method in a microgrid for its inertia support feature. However, active power oscillation and improper transient active power sharing are observed when basic VSG control is applied. Moreover, the problem of reactive power sharing error, inherited from conventional droop control, should also be addressed to obtain desirable stable state per-formance. In this paper, an enhanced VSG control is proposed, with which oscillation damping and proper transient active power sharing are achieved by adjusting the virtual stator reactance based on state-space analyses. Furthermore, communication-less accurate reactive power sharing is achieved based on inversed voltage droop control feature (V–Q droop control) and common ac bus voltage estimation. Simulation and experimental results verify the improvement introduced by the proposed enhanced VSG control strategy.

Other Details

Paper ID: IJSARTV
Published in: Volume : 5, Issue : 1
Publication Date: 1/4/2019

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