Impedance-based stability analysis of multi-parallel inverters applying total source admittance
Alenius, Henrik; Berg, Matias; Luhtala, Roni; Roinila, Tomi; Messo, Tuomas (2019)
Proceedings of the IEEE Workshop on Control and Modeling for Power Electronics (COMPEL)
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Julkaisun pysyvä osoite on
The utility-scale wind and solar electricity production is typically connected to the power grid through multiple parallel three-phase inverters. One of the main issues in such grid-connected systems is the harmonic resonance caused by interactions between the grid and inverters. A common method for the analysis of these systems has been the impedance-based stability criterion. However, in systems that have multiple parallel inverters, the system complexity and challenges in obtaining the required impedance measurements may deteriorate the accuracy of the impedance-based approach. This paper discusses the aggregation of parallel inverters and the stability analysis of such grid-connected system. A simple method, based on impedance measurements, is shown for defining the allowable number of paralleled inverters so that the system remains stable. Experimental results are shown from power hardware-in-The-loop setup recently developed at DNV GL Flexible Power Grid Lab.
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