In low-voltage power networks with a large share of distributed energy sources, the phenomenon of overvoltage is increasingly observed. Although it may be desirable to raise the voltage value downstream of the network, in some cases the upper allowable voltage limit is exceeded. The method of eliminating voltage rises commonly used in the Polish power system is the installation of overvoltage protections, disconnecting the source from the grid. Such action reduces the profitability of prosumer installations, discouraging future potential investors. It turns out, however, that this is not the only disadvantage of such a solution. Sudden and uncoordinated disconnections and reconnections of more energy sources cause abrupt voltage changes that negatively affect the voltage conditions in the network. The aim of the paper is to present the operating algorithms of a standard overvoltage relay used in inverters of photovoltaic microinstallations. These algorithms – described in standards and national regulations – were tested in a typical inverter used in public low-voltage networks and implemented in the created simulation model of the relay. The described tests will be used for further work to demonstrate the need to coordinate the operation of overvoltage protections or replace them with other measures to improve voltage conditions in the grid with high share of photovoltaic sources.


overvoltage protection; distributed power generation; photovoltaic systems; power distribution lines

Appen J. et al.: Time in the sun: The challenge of high PV penetration in the German electric grid. IEEE Power and Energy Magazine 11(2), 2013, 55–64 [http://doi.org/10.1109/MPE.2012.2234407]. DOI: https://doi.org/10.1109/MPE.2012.2234407

Hashemi S., Østergaard J.: Methods and strategies for overvoltage prevention in low voltage distribution systems with PV. IET Renewable Power Generation 11(2), 2017, 55–64 [http://doi.org/10.1049/IET-PG.2016.0277]. DOI: https://doi.org/10.1049/iet-rpg.2016.0277

Janiga K.: A review of voltage control strategies for low-voltage networks with high penetration of distributed generation. Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska – IAPGOS 3, 2020, 60–65 [http://doi.org/10.35784/iapgos.1928]. DOI: https://doi.org/10.35784/iapgos.1928

Mahmud N., Zahedi A.: Review of control strategies for voltage regulation of the smart distribution network with high penetration of renewable distributed generation. Renewable and Sustainable Energy Reviews 64/2016, 582–595 [http://doi.org/10.1016/j.rser.2016.06.030]. DOI: https://doi.org/10.1016/j.rser.2016.06.030

Renewable Energy Sources Act of February 20/2015, Dz. U. 2015 poz. 478

Commission Regulation (EU) 2016/631 of April 14, 2016 establishing the EU network code.

Instruction of Distribution Network Operation and Maintenance (IRiESD), PGE Dystrybucja S.A.

PN-EN 50160:2010 Parametry napięcia zasilającego w publicznych sieciach elektroenergetycznych.

PN-EN 50549-1:2019-02 Wymagania dla instalacji wytwórczych przeznaczonych do równoległego przyłączania do publicznych sieci dystrybucyjnych.

PN-EN 50438:2014-02 Wymagania dla instalacji mikrogeneracyjnych przeznaczonych do równoległego przyłączania do publicznych sieci dystrybucyjnych niskiego napięcia.

PN-EN 61000-4-30: 2015-05 Kompatybilność elektromagnetyczna (EMC) - Część 4-30: Metody badań i pomiarów - Metody pomiaru jakości energii.

Set of requirements for type A power generating modules, including microinstallations, PGE Dystrybucja S.A.


Published : 2021-06-30

Janiga, K. (2021). OVERVOLTAGE PROTECTION OF PV MICROINSTALLATIONS – REGULATORY REQUIREMENTS AND SIMULATION MODEL. Informatyka, Automatyka, Pomiary W Gospodarce I Ochronie Środowiska, 11(2), 40-43. https://doi.org/10.35784/iapgos.2659

Klara Janiga  k.janiga@pollub.pl
Lublin University of Technology, Faculty of Electrical Engineering and Computer Science, Lublin, Poland  Poland