Modeling and Analysis of Weak Grid Considering Phase Locked Loop and Synchronous Condenser Effect on Grid Stability

This paper presents a modeling framework for wind integrated weak power grid and a detailed analysis of grid stability. The analysis uses a weak power grid model with Type-4 Wind Turbine Generator (WTG) integrated to a lumped group of Australian thermal power stations using steam governor and IEEE T...

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Bibliographic Details
Published in2020 IEEE International Conference on Power Electronics, Smart Grid and Renewable Energy (PESGRE2020) pp. 1 - 6
Main Authors Geis-Schroer, Johanna, Nair, Anuprabha Ravindran, Patel, Shyamal, Kamalasadan, Sukumar
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.01.2020
Subjects
Circuit stability
Grid Inertia
Grid Stability
Phase-Locked Loop
Power system stability
Stability analysis
Synchronous Condenser
Synchronous generators
Voltage control
Wind farms
Wind Turbine Control
Wind turbines
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Summary:This paper presents a modeling framework for wind integrated weak power grid and a detailed analysis of grid stability. The analysis uses a weak power grid model with Type-4 Wind Turbine Generator (WTG) integrated to a lumped group of Australian thermal power stations using steam governor and IEEE T2 AVR control model through a variable impedance network representing the grid. The represented model can seamlessly evaluate the grid fluctuations with respect to the point of common coupling (PCC) of the wind farm as the grid strength varies. Steady-state and dynamic cases with varying network impedances are analyzed first. Then the effect of phase-locked loop (PLL) on grid stability is analyzed for varied test cases formulated based on the short circuit ratio of the grid. Further, the enhancement of grid stability is analyzed by integrating a synchronous condenser(SC) at PCC. Enhanced reactive power support offered by the SC improves the steady-state and transient voltage stability as the grid strength decreases.
DOI:10.1109/PESGRE45664.2020.9070728