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Abstract
In this study, a coordinated control scheme is proposed for sharing harmonics compensation effort among voltage and current controlled mode (VCM and CCM) inverters in islanded microgrids. In this method, the voltage harmonics compensation of sensitive bus (SB) is achieved by using secondary control as well as virtual impedance and admittance loops in primary control of VCM and CCM units. The limited capacity of the inverter is taken into account for harmonics compensation. Photovoltaic (PV) systems are considered as CCM units. The harmonics compensation is mainly performed by VCM inverters. However, in order to prevent these units from overloading, the PV interfacing inverters (CCM units) are called to collaborate in harmonics compensation whenever needed. The results of simulation study in Matlab/Simulink show the effectiveness of this method in coordination of CCM and VCM units.
Highlights
Voltage Source Inverters (VSIs) are widely utilized for integration of Distributed Generation units (DGs) including Renewable Energy Resources (RESs) to distribution systems and Microgrids (MG) [1,2,3,4,5,6]
If VCM units reach to their full capacity, the CCM units will contribute in power quality enhancement in order to prevent the VCM units from overloading
A coordinated secondary-control-based method is proposed for VCM and CCM units in an islanded microgrid
Summary
Voltage Source Inverters (VSIs) are widely utilized for integration of Distributed Generation units (DGs) including Renewable Energy Resources (RESs) to distribution systems and Microgrids (MG) [1,2,3,4,5,6]. In [32], an SC-based coordinated control of VCM and CCM units is proposed In this method, the limited capacity of inverters is not considered. In [33], the coordinated control of VCM and CCM units for harmonic and reactive power sharing based on local data is proposed. In this control method, capacitive virtual impedance and conductive virtual admittance are respectively used in VCM and CCM units for harmonics compensation.
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