Control of Grid Connected PV Systems with Grid Support Functions
Author
Man, Elena Anamaria
Term
4. term
Education
Publication year
2012
Pages
121
Abstract
Det stigende antal nettilsluttede solcelleinvertere (PV-invertere) skaber udfordringer for elnettets stabilitet, sikkerhed og effektkvalitet. Dette projekt undersøger og forbedrer standardmetoder til regulering af PV-invertere med fokus på spændingsstøtte i lavspændingsdistributionsnet (LV). To strategier for levering af reaktiv effekt, som er foreskrevet i den tyske netkode: cosφ(P), hvor effektfaktoren tilpasses efter aktiv effekt, og Q(U), hvor reaktiv effekt reguleres efter den målte spænding, analyseres og afprøves gennem lastflydningssimuleringer på et typisk LV-distributionssystem. Derudover implementeres en forbedret Q(U)-metode, der har til formål at minimere distributionssystemets forbrug af reaktiv effekt ved at koordinere enheder via kommunikationsprotokollen IEC 61850. Oplysninger udveksles over Ethernet i en server/klient-arkitektur.
The growing number of grid-connected photovoltaic (PV) inverters introduces challenges for grid stability, safety, and power quality. This project examines and refines standard control methods for PV inverters, with a focus on voltage support in low-voltage (LV) distribution networks. It studies two reactive power supply strategies required by the German grid code: cosφ(P), which adjusts power factor as a function of active power, and Q(U), which adjusts reactive power based on the measured voltage, and tests them using load-flow simulations on a typical LV distribution system. The project also implements an improved Q(U) method that aims to reduce the distribution system’s reactive power consumption by coordinating devices through the IEC 61850 communication protocol. Information is exchanged over Ethernet using a server/client architecture.
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