Abstract
The development in distributed energy resources technology has led to a significant amount of non-linear power electronics converters to be integrated in the power system. Although this leads to a more sustainable system, it also can have adverse impacts on system stability and energy power quality. More importantly, the majority of the distribution power systems currently are unbalanced (with asymmetrical voltages) due to load unbalance, while the most common fault types are unbalanced grid faults that can have many adverse effects on distributed resource operations. In that regard, proper control of the grid connected converters in active unbalanced distribution systems will become very important. This paper aims to present the behavior of the advanced grid connected converter control technique under different voltage states at the point of common coupling (according to the ABC classification). The main insufficiencies of the classical control technique will be highlighted, while the paper will propose an appropriate solution for mitigation of negative sequence currents under asymmetrical voltages at the point of common coupling. An extensive experimental verification of the proposed techniques is performed using an advanced laboratory prototype for research in grid integration of distributed resources. The experimental verification clearly demonstrates the benefits offered by the advanced control strategy.
Highlights
Recent advances in power electronic converter technologies and their subsequent involvement in modern renewable energy sources (RES) offered the possibility for the proliferation of power electronics based distributed energy resources (DERs) in the network [1]
This paper aims to showcase the behavior of the standard grid connected converter (GCC) control technique in active unbalanced distribution systems
Since the classical control technique has certain deficiencies when asymmetrical voltages are applied at the GCC input, improvements are necessary in order to fulfill the strict future requirements outlined in the grid code (GC)
Summary
Recent advances in power electronic converter technologies and their subsequent involvement in modern renewable energy sources (RES) offered the possibility for the proliferation of power electronics based distributed energy resources (DERs) in the network [1]. Driven by strong economic and technical incentives, a trend of an increase in the installed capacity can be noted on a regional and a worldwide level, as seen in Figure 1 (for the European region). With their intermittent nature, DERs can significantly influence the system stability and reliability, especially at the distribution voltage levels. As the key component of future power generation systems, the GCC will inevitably be responsible for tasks regarding energy trading, offering fault ride through (FRT) capabilities, and achieving the required power quality for supplying consumers.
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