TY - JOUR
T1 - Augmenting load flow software for reliable steady-state voltage stability studies
AU - Sarnari, Alberto José
AU - Živanović, Rastko
AU - Al-Sarawi, Said
PY - 2019/9/1
Y1 - 2019/9/1
N2 - For decades, researchers and practitioners have developed improvements for Newton-Raphson (N-R) load flow to overcome some of its limitations. In this paper, we present a novel method to solve those inherent iterative algorithm limitations. It is based on N-R combined with a supplementary algorithm that uses the discrete Fourier transform (DFT) and robust Padé approximants (PAs) and it is suitable for planning and simulation studies. This novel method analyses bus behaviour from the loading perspective where plain N-R may not converge to the correct results. Thus, avoiding possible performance deficiencies when bus loading approaches the stability limit or when starting point is not close enough to the actual operating value. The proposed method samples voltages in the complex domain to attain superior convergence properties, guaranteeing high accuracy within the bus-voltage stability limits (VSLs). Additionally, as a by-product of the proposed method, load buses can be classified according to their criticality. The presented method will suit existing N-R-based systems with minor modifications, allowing practitioners to preserve their investment in load flow software. Results and performance comparisons with the conventional N-R, holomorphic embedding load flow method (HELM), and continuation power flow (CPF) are presented to demonstrate the robustness of the proposed method.
AB - For decades, researchers and practitioners have developed improvements for Newton-Raphson (N-R) load flow to overcome some of its limitations. In this paper, we present a novel method to solve those inherent iterative algorithm limitations. It is based on N-R combined with a supplementary algorithm that uses the discrete Fourier transform (DFT) and robust Padé approximants (PAs) and it is suitable for planning and simulation studies. This novel method analyses bus behaviour from the loading perspective where plain N-R may not converge to the correct results. Thus, avoiding possible performance deficiencies when bus loading approaches the stability limit or when starting point is not close enough to the actual operating value. The proposed method samples voltages in the complex domain to attain superior convergence properties, guaranteeing high accuracy within the bus-voltage stability limits (VSLs). Additionally, as a by-product of the proposed method, load buses can be classified according to their criticality. The presented method will suit existing N-R-based systems with minor modifications, allowing practitioners to preserve their investment in load flow software. Results and performance comparisons with the conventional N-R, holomorphic embedding load flow method (HELM), and continuation power flow (CPF) are presented to demonstrate the robustness of the proposed method.
KW - continuation power flow
KW - DFT-Padé
KW - holomorphic embedding load flow
KW - Newton-Raphson
KW - voltage stability limit
UR - http://www.scopus.com/inward/record.url?scp=85068131066&partnerID=8YFLogxK
U2 - 10.1002/2050-7038.12047
DO - 10.1002/2050-7038.12047
M3 - Article
AN - SCOPUS:85068131066
SN - 1430-144X
VL - 29
JO - International Transactions on Electrical Energy Systems
JF - International Transactions on Electrical Energy Systems
IS - 9
M1 - e12047
ER -