TY - JOUR
T1 - Online Voltage Stability Assessment for Load Areas Based on the Holomorphic Embedding Method
AU - Liu, Chengxi
AU - Wang, Bin
AU - Hu, Fengkai
AU - Sun, Kai
AU - Bak, Claus Leth
PY - 2018/7/1
Y1 - 2018/7/1
N2 - This paper proposes an online steady-state voltage stability assessment scheme to evaluate the proximity to voltage collapse at each bus of a load area. Using a non-iterative holomorphic embedding method (HEM) with a proposed physical germ solution, an accurate loading limit at each load bus can be calculated based on online state estimation on the entire load area and a measurement-based equivalent for the external system. The HEM employs a power series to calculate an accurate Power-Voltage (P-V) curve at each load bus and accordingly evaluates the voltage stability margin considering load variations in the next period. An adaptive two-stage Pade approximants (PA) method is proposed to improve the convergence of the power series for accurate determination of the nose point on the P-V curve with moderate computational burden. The proposed method is illustrated in detail on a 4-bus test system and then demonstrated on a load area of the Northeast Power Coordinating Council (NPCC) 48-generator, 140-bus power system.
AB - This paper proposes an online steady-state voltage stability assessment scheme to evaluate the proximity to voltage collapse at each bus of a load area. Using a non-iterative holomorphic embedding method (HEM) with a proposed physical germ solution, an accurate loading limit at each load bus can be calculated based on online state estimation on the entire load area and a measurement-based equivalent for the external system. The HEM employs a power series to calculate an accurate Power-Voltage (P-V) curve at each load bus and accordingly evaluates the voltage stability margin considering load variations in the next period. An adaptive two-stage Pade approximants (PA) method is proposed to improve the convergence of the power series for accurate determination of the nose point on the P-V curve with moderate computational burden. The proposed method is illustrated in detail on a 4-bus test system and then demonstrated on a load area of the Northeast Power Coordinating Council (NPCC) 48-generator, 140-bus power system.
KW - Continuation power flow
KW - Padé approximant
KW - holomorphic embedding method
KW - voltage stability assessment
KW - voltage stability margin
UR - http://www.scopus.com/inward/record.url?scp=85033725607&partnerID=8YFLogxK
U2 - 10.1109/TPWRS.2017.2771384
DO - 10.1109/TPWRS.2017.2771384
M3 - Journal article
SN - 0885-8950
VL - 33
SP - 3720
EP - 3734
JO - I E E E Transactions on Power Systems
JF - I E E E Transactions on Power Systems
IS - 4
ER -