A method to implement Ward equivalent based on power flow calculation and short circuit calculation
DOI：10.7667/PSPC171792
Key Words:power system equivalence  power flow calculation  short-circuit calculation  node voltage  node admittance matrix
Author NameAffiliationE-mail
XU Hai NARI Group Corporation State Grid Electric Power Research Institute, Nanjing 211106, China
China EPRI Science & Technology Co., Ltd, Beijing 102200, China 		 
YANG Shangjin NARI Group Corporation State Grid Electric Power Research Institute, Nanjing 211106, China
China EPRI Science & Technology Co., Ltd, Beijing 102200, China 		 
JIN Xuefen NARI Group Corporation State Grid Electric Power Research Institute, Nanjing 211106, China
China EPRI Science & Technology Co., Ltd, Beijing 102200, China 		jinxuefen@sgepri.sgcc.com.cn 
WANG Yang NARI Group Corporation State Grid Electric Power Research Institute, Nanjing 211106, China
China EPRI Science & Technology Co., Ltd, Beijing 102200, China 		 
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Abstract:To perform electromagnetic transient calculation on power systems, the equivalent simplification of original system should be carried out. In the electricity market environment, due to trade secrets, the relevant practitioners may not have external network information, or do not have software modules for equivalent simplification of large-scale power system, which brings difficulties to engineering calculation. A method to implement Ward equivalent based on power flow calculation and short circuit calculation is proposed. First, the currents from internal network to boundary nodes are treated as equivalent injection currents of boundary nodes. Then the node voltages and short-circuit currents are obtained by short-circuit current calculation of the boundary nodes of original system. Finally, the equivalent system parameters are calculated by node voltage equation. Theoretical analyses and results of an actual system simulation show that this method has high accuracy. This work is supported by Science and Technology Project of State Grid Corporation of China (No. 52466F150007).
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