An electromechanical-electromagnetic hybrid simulation algorithm based on boundary nodes grouping and decoupling is proposed. First UHV AC/DC backbone network is divided into electromagnetic network, and the other networks will be decoupled at the boundary nodes by group as electromechanical network. Then electromagnetic network is divided into many connected subnets by distributed parameter decoupling long transmission lines. Furthermore, according to constraint of the designated number of subnets, the heuristic rules are used for subnets merging and homogenizing, and based on the decoupling initial state of electromechanical network, the scheme of grouping boundary nodes is formed. So the subnet groups at electromechanical side are completely decoupled, and the subnet groups at electromagnetic side are only connected by decoupling long transmission lines. Finally,the parallel methods of the main control at electromechanical and electromagnetic sides are proposed based on this scheme.The theoretical derivation and simulation of the algorithm shows that the algorithm can improve the efficiency of the hybrid simulation with a large number of boundary nodes greatly.
Power System Technology