Optimal dynamic voltage support in photovoltaic system integration
File(s)
Author(s)
Nikolaou, Andreas
Type
Thesis
Abstract
The rapid transition to green energy is changing the way that power system networks are operating. This is due to the uncertain behaviour of renewable energy sources (RES) and the drop in the dynamic influence from Synchronous Generator (SG) in the network. This thesis has documented and expanded the main concerns regarding the change of dynamics in the power network. Connecting the inverter based resource (IBR) as a constant power source has introduced new challenges for the system operators for maintaining a stable and safe operation. Reports from grid operators and researchers for projects with ancillary services provided by inverter based resource (IBR), shows that the implementation of advanced control strategies and different control modes enhance the reliability and stability of the power grid. Transitioning to a 100% inverter based resource (IBR) dominant system, Grid-forming Inverter (GFM) has been proposed as a mandatory requirement to achieve this target. Therefore, in this thesis, an optimal Dynamic Voltage Support (oDVS) has been proposed operating as a current limitation mechanism. The proposed method has been implemented into a 2-bus system modelled as a weak grid with high grid impedance with various X/R ratios. The outcome proves that the optimised coordination of fault current and tracking of the angle of displacement can enhance the Dynamic Voltage Support (DVS) improving the voltage profile in the Point of Common Coupling (PCC) even in low X/R ratio networks.
Version
Open Access
Date Issued
2024-06-06
Date Awarded
01/02/2025
Copyright Statement
Creative Commons Attribution NonCommercial Licence
License URL
Advisor
Pal, Bikash
Batzelis, Stratis
Publisher Department
Electrical and Electronic Engineering
Publisher Institution
Imperial College London
Qualification Level
Doctoral
Qualification Name
Doctor of Philosophy (PhD)