A framework to assess voltage stability of power grids with high penetration of solar PV systems. (July 2022)

• Record Type: Journal Article
• Authors: Rahman, S.; Saha, S.; Haque, M.E.; Islam, S.N.; Arif, M.T.; Mosadeghy, M.; Oo, A.M.T.
• Is Part Of: International journal of electrical power & energy systems. Volume 139(2022)
• Publication Date: 2022-07
• Subjects: Solar PV -- Voltage stability -- Monte Carlo simulation -- Modal analysis -- Critical eigenvalue -- Reactive power margin -- Loading margin; Electrical engineering -- Periodicals; Electric power systems -- Periodicals; Électrotechnique -- Périodiques; Réseaux électriques (Énergie) -- Périodiques; Electric power systems; Electrical engineering; Periodicals; 621.3
• DOI: 10.1016/j.ijepes.2021.107815
• Languages: English
• ISSNs: 0142-0615

Abstract

Abstract: In recent years, grid integration of solar photovoltaic (PV) systems has proliferated across many countries in order to reduce greenhouse gas emission and minimize energy cost. However, the intermittency inherent within PV generator may affect the grid voltage stability significantly. Therefore, it is imperative to consider the intermittent nature of solar PV power generation and uncertainties associated with load demand to gain a clear insight on power grid voltage stability with high PV penetration. In this Writing – original draft, a framework is presented for power grid voltage stability analysis considering uncertainties of PV power generation and load demand using Monte Carlo simulation. The expected values of voltage stability indices such as critical eigenvalue, line loss, reactive power margin and loading margin have been determined in the proposed framework and their probability distribution have been obtained for different times throughout a day. The proposed methodology has been verified by analysing voltage stability of the modified IEEE 14 bus test system with high penetration of PV energy sources and considering uncertainties associated with load demand. The results provide a holistic understanding on voltage stability of the test system with different penetration levels of PV energy sources into the power grid during contingency as well as normal operating conditions. Highlights: A framework for voltage stability assessment of grid with high PV penetration. Uncertainties associated with solar power and load demands are considered. Hourly variations in voltage stability indices is determined due to PV penetration.