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To solve the problem of lacking of accurate protection relay models in power system dynamic simulation, a general modeling method of protection relay based on “virtual relay” is proposed. A “virtual relay” is a kind of simulation for real relay and defined with rules of logic operation. With hierarchical structure and object-oriented modeling strategy, this method has the advantages of clean logic...
This paper proposes a method to perform electromechanical and electromagnetic transient hybrid simulation, including the interface location, the mutual equivalence solution of the electromechanical system and the electromagnetic system, which can perform excellently when the positive and negative sequence parameters of the equivalent circuit are different. The least square method is adopted to obtain...
Fault simulation is one of the main components of dynamic electric power system simulation programs. In this work, a fault-branch based admittance matrix was used to simulate a variety of multiple symmetrical or asymmetrical faults in unified dynamic power system simulation software. Admittance matrix contraction was employed to process multiple faults and random faults. An important feature of this...
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