Conference paper
An algorithm for reduction of extracted power from photovoltaic strings in grid-tied photovoltaic power plants during voltage sags
Nanyang Technological University1
University of New South Wales2
Department of Electrical Engineering, Technical University of Denmark3
Center for Electric Power and Energy, Centers, Technical University of Denmark4
Smart Electric Components, Center for Electric Power and Energy, Centers, Technical University of Denmark5
Due to the high penetration of the installed distributed generation units in the power system, the injection of reactive power is required for the medium-scale and large-scale grid-connected photovoltaic power plants (PVPPs). Because of the current limitation of the grid-connected inverter, the injected active power should be reduced during voltage sags.
In order to obtain a constant dc-link voltage in a multi-string PVPP, the extracted power from PV strings should be equal to the injected power to the grid in all operating conditions (excluding power losses). Therefore, the extracted power of PV strings should be reduced during voltage sags. In this paper, an algorithm is proposed for determining the reference voltage of the PV string which results in a reduction of the output power to a certain amount.
The proposed algorithm calculates the reference voltage for the dc/dc converter controller, based on the characteristics of the power-voltage curve of the PV string and therefore, no modification is required in the the controller of the dc/dc converter. Simulation results on a 50-kW PV string verified the effectiveness of the proposed algorithm in reducing the power from PV strings under different irradiation and reference power values.
Language: | English |
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Publisher: | IEEE |
Year: | 2016 |
Pages: | 3018-3023 |
Proceedings: | 42nd Annual Conference of the IEEE Industrial Electronics Society |
ISBN: | 1509034749 , 1509034757 , 9781509034741 and 9781509034758 |
Types: | Conference paper |
DOI: | 10.1109/IECON.2016.7793187 |
ORCIDs: | Agelidis, Vassilios |
Active power reduction Active/reactive power injection Fault-ride through capability Photovoltaic systems SDG 7 - Affordable and Clean Energy dc/dc converter
DC-DC converter controller DC-DC power convertors Inverters Maximum power point trackers PVPP Power quality Reactive power active power reduction distributed generation units distributed power generation extracted power reduction grid-connected inverter grid-connected photovoltaic power plant grid-tied photovoltaic power plants invertors photovoltaic power systems photovoltaic strings power 50 kW power supply quality power system power system interconnection reactive power reactive power injection voltage sags