Impact of Advanced Inverter Functions on Low-Voltage Power Grids
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In today’s grid, a great amount of inverter-based Distributed Energy Resources (DERs) are connected and are mainly designed to supply power without considering the voltage and frequency deviations of the grid. Therefore, Distribution System Operators (DSOs) are challenged with an increase in grid events due to the random implementation of DERs. Voltage levels can vary beyond predened limits at the Point Of Connection (POC) and are currently not evaluated by DSOs. This paper summarizes the development of a simulation model for evaluating the impact of support functions integrated in inverter-based DERs. The model aims to help grid operators to simulate voltage and frequency events and study the impact of DERs to the grid with respect to different settings of integrated support functions. A model is developed in MATLAB/Simulink conform to European standards and regulations. Grid dynamics can be evaluated by imitating voltage and frequency deviations. Support functions can either be adjusted according to the situation or turned off. Together with adjustable settings according to DSO request, this model offers exibility and insight in the capabilities of DERs to solve voltage and frequency issues. Case studies show that the model corresponds to expected behavior and can be used for further development.
Document typePeer reviewed
Document versionFinal PDF
SourceIET Energy Systems Integration. 2021, vol. 3, issue 4, p. 426-436.