Roland Bründlinger

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Photovoltaic (PV) systems and other Distributed Energy Resources (DERs) can provide voltage and frequency support to the electric grid through commanded and autonomous operating modes. These functions have been standardized in the International Electrotechnical Commission (IEC) Technical Report 61850-90-7 in 2013; and recently, in response to national and(More)
This paper presents a concise description of state-of-the-art real-time simulation-based testing methods and demonstrates how they can be used independently and/or in combination as an integrated development and validation approach for smart grid DERs and systems. A three-part case study demonstrating the application of this integrated approach at the(More)
As variable, non-dispatchable photovoltaic power continues to displace traditional generation assets, additional resources are needed to control bulk and local power systems. One highly versatile option for providing frequency and voltage stability is to incorporate Energy Storage Systems (ESSs) at the distribution-level. Deployment of these technologies is(More)
This paper provides a discussion on the implementation of protective functions in photovoltaic (PV) inverters in terms of sensitivity to power quality disturbances. First, sensitivity characteristics obtained from extensive testing on a set of commercial products are presented. The results show that most inverters exhibit a quite sensitive behavior, which(More)
Grid operators are increasingly turning to new advanced grid-support functions in distributed energy resources (DER) to assist with distribution circuit voltage regulation, bulk system frequency control, and power system protection. While these functions have been deployed in Europe for years, the United States is in the process of adding them to state and(More)
The large-scale roll out of renewables in several regions in the world has led to changes in the planning and operation of the power systems. They are becoming visible nowadays on all voltage levels in distribution and partly also in transmission grids. This creates additional challenges to energy utilities due to their stochastic generation behavior.(More)
Renewables are key enablers in the plight to reduce greenhouse gas emissions and cope with anthropogenic global warming. The intermittent nature and limited storage capabilities of renewables culminate in new challenges that power system operators have to deal with in order to regulate power quality and ensure security of supply. At the same time, the(More)
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