Frontiers in Energy

, Volume 11, Issue 2, pp 155–167 | Cite as

Influence of increasing numbers of RE-inverters on the power quality in the distribution grids: A PQ case study of a representative wind turbine and photovoltaic system

  • Przemyslaw Janik
  • Grzegorz Kosobudzki
  • Harald Schwarz
Research Article


This paper presents the selected power quality (PQ) indicia of a wind generator and a photovoltaic installation considered to be the representative of medium voltage and low voltage distribution grids. The analysis of measured values suggests that the decrease in PQ is a case of specific combination of distributed generation, grid parameters and load behaviour. Modern generators have a limited impact on PQ. On the other hand, fluctuations in power generation are regarded as an emerging PQ indicator. The growing number of distributed renewable installations causes stochastic, variable, and hardly predictable power flows in the distribution grid. The nature of fluctuations in wind and solar generation is different. In both cases, new indexes for the quantification of fluctuations are needed and are yet not standardised. Proper assessment of these fluctuations enables definition of useful fluctuation limits and rules for optimal storage system integration.


power quality harmonics sags photovoltaic (PV) system doubly feed induction generator (DFIG) inverters 


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Copyright information

© Higher Education Press and Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  1. 1.Brandenburg University of TechnologyCottbus-SenftenbergGermany
  2. 2.Department of Electrical EngineeringWroclaw University of Science and TechnologyWroclawPoland
  3. 3.Department for Energy Distribution and High Voltage EngineeringBrandenburg University of TechnologyCottbus-SenftenbergGermany

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