Over-frequency support in large-scale photovoltaic power plants using non-conventional control architectures

•Photovoltaic power plants must provide grid services defined in the grid codes.•There is a trend to reduce the frequency regulation response time requirements.•Common centralized control solutions have limitations to reach a fast response time.•The proposed hierarchical control architecture achieve...

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Published in:International journal of electrical power & energy systems 2021-05, Vol.127, p.106679, Article 106679
Main Authors: Madorell-Batlle, Queralt, Bullich-Massagué, Eduard, Cheah-Mañé, Marc, Gomis-Bellmunt, Oriol
Format: Article
Language:English
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Control architecture
Frequency
Frequency regulation
Grid code
PV power plant
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cited_by cdi_FETCH-LOGICAL-c352t-4a459fc98072fabb23dc49aba2b058355ad06ecc34c57614c825c61d5f8222aa3
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container_title International journal of electrical power & energy systems
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creator Madorell-Batlle, Queralt
Bullich-Massagué, Eduard
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description •Photovoltaic power plants must provide grid services defined in the grid codes.•There is a trend to reduce the frequency regulation response time requirements.•Common centralized control solutions have limitations to reach a fast response time.•The proposed hierarchical control architecture achieves a response time
doi_str_mv 10.1016/j.ijepes.2020.106679
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Large scale photovoltaic power plants must provide a frequency regulation service, which is defined in the grid codes. This service has commonly required a response time between 15 and 30 s. But some countries are now introducing more strict regulations and requiring response times below 2 s. The typical centralized control architecture of photovoltaic power plants for frequency regulation can present undesired oscillatory responses (or even become unstable) when tuning the controller to achieve these small time response requirements. The present article proposes an alternative solution based on a hierarchical control architecture. In the proposed solution, inverter controllers apply a local frequency regulation action and the central controller corrects active power errors at the point of connection, which can be caused by power losses or lack of irradiance in some inverters. Simulation models are used to study and test the response of this new control approach. 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subjects Control architecture
Frequency
Frequency regulation
Grid code
PV power plant
title Over-frequency support in large-scale photovoltaic power plants using non-conventional control architectures
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