Abstract
Chilean National Commission for Scientific and Technological Research/Formation of Advanced Human Capital Programme (CONICYT/PFCHA)/Doctorado Nacional/2017-21171858 Comision Nacional de Investigacion Cientifica y Tecnologica (CONICYT) CONICYT FONDECYT 1170883 National Agency of Research and Development/Associative Research Program (ANID PIA)/Basal AFB180003 Solar Energy Research Center (SERC), Chile ANID/FONDAP/15110019 National Agency of Research and Development (ANID)/Basal FB0008 National Fund for Scientific and Technological Development (FONDEQUIP) EQM160122
Highlights
An MG is inherently an unbalanced system where unbalanced loads produce negative sequence components in its currents and voltages [1], and these can cause problems in the MG
Βi is a control action to achieve voltage regulation and the control actions βia, βib and βic are defined to achieve the sharing of unbalanced currents among the power converters in the MG
Five steps are considered in this experimental test: in step 1, the proposed control scheme is disabled; in step 2, the control actions to regulate the voltage at the output of the power converters at 120V RMS are enabled
Summary
An MG is inherently an unbalanced system where unbalanced loads produce negative sequence components in its currents and voltages [1], and these can cause problems in the MG. Voltage imbalances are created using a different approach It is proposed and shown in this work, that it is simple and effective to induce imbalances in Eiabc ( to achieve the unbalanced-current sharing) by analysing the system as three single-phase subsystems, avoiding the use of (for instance) the SCT or the CPT. Βi is a control action to achieve voltage regulation and the control actions βia, βib and βic are defined to achieve the sharing of unbalanced currents among the power converters in the MG Single-phase P − ω droop controllers are not proposed in this work since their implementation produce different frequencies in the voltages Ei∗a, Ei∗b, Ei∗c as is discussed in [10] In this reference, a centralised approach to achieving power-sharing per phase is proposed. Different frequencies could be a severe drawback if the microgrid is feeding three-phase loads such as motors [10]
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