Voltage limitation by autonomous reactive power control of grid connected photovoltaic inverters

Georg Kerber, Rolf Witzmann, Hannes Sappl

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

60 Scopus citations

Abstract

The increasing decentralized power generation in the public low voltage grid may lead to a reversed load flow. The common assumption that the highest voltage in a low voltage grid is on the transformer busbar is then no longer appropriate. Therefore the risk of overvoltages rises significantly. A highly effective way to keep the voltage within the allowed bandwidth is to utilize the ability of modern voltage source converters (VSC) to provide or absorb reactive power while feeding active power into the network (4-quadrant operation). With a reactive power consumption while active power is fed in the voltage rise can be limited. For practical use a grid adaptive reactive power control system which works without manual set up or communication requirements is desirable. Therefore an exemplary adaptive control system was designed, modeled in a load flow simulation program and tested on different low voltage (LV) grid models for network classes prone to voltage problems. The results show that simple parameter sets can be found which will work on most grid infrastructures without further adjustment. But they also show the problems to keep the voltage within the limits without decreasing the maximum grid transport capacity by consuming innecessary reactive power.

Original languageEnglish
Title of host publicationCPE 2009 - 6th International Conference-Workshop - Compatability and Power Electronics
Pages129-133
Number of pages5
DOIs
StatePublished - 2009
EventCPE 2009 - 6th International Conference-Workshop - Compatability and Power Electronics - Badajoz, Spain
Duration: 20 May 200922 May 2009

Publication series

NameCPE 2009 - 6th International Conference-Workshop - Compatability and Power Electronics

Conference

ConferenceCPE 2009 - 6th International Conference-Workshop - Compatability and Power Electronics
Country/TerritorySpain
CityBadajoz
Period20/05/0922/05/09

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