Open AccessOscillatory stability assessment of microgrid in autonomous operation with uncertainties
Author(s) -
Krismanto Awan Uji,
Mithulananthan Nadarajah,
Kamwa Innocent
Publication year - 2018
Publication title -
iet renewable power generation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.005
H-Index - 76
ISSN - 1752-1424
DOI - 10.1049/iet-rpg.2017.0579
Subject(s) - microgrid , control theory (sociology) , renewable energy , photovoltaic system , wind speed , monte carlo method , wind power , probabilistic logic , parametric statistics , dynamic simulation , computer science , environmental science , automotive engineering , engineering , simulation , physics , meteorology , mathematics , statistics , control (management) , artificial intelligence , electrical engineering
One of the main challenges of the microgrid (MG) operation in autonomous mode is the uncertain output due to the fluctuating nature of renewable energy resources (RES). This study investigates the effects of RES uncertainties to the oscillatory stability of a hybrid MG in islanded operation. A comprehensive model of Wind Energy Conversion System (WECS), a two‐stage Photovoltaic (PV) and bio‐‐diesel engine (BDE) based distributed generation (DG) units are considered to capture a complete dynamic response of the hybrid MG. Trajectories and distribution of damping ratios and oscillatory frequencies of the critical modes were thoroughly investigated through Monte Carlo simulation considering wind speed and solar irradiance uncertainties. From the probabilistic study, it was observed that the presence of RES variations results in a dynamic change of power‐sharing strategies and introduce an adverse effect on small signal stability. Uncertain condition of wind speed brings more deterioration in system damping than solar irradiation variation. From time domain simulation, it was confirmed that at higher wind speed, damping on the critical modes reduced. As a consequence, the hybrid MG experienced more oscillatory conditions and even lead to unstable situation at high wind speed conditions. While with solar irradiance change, the investigated MG system can maintain its stable operation.