Systematic modeling and symbolically assisted simulation of power systems

Large disturbance behavior of power systems often involves complex interactions between continuous dynamics and discrete events. Such behavior can be captured in a systematic way by a model that consists of differential, switched algebraic and state-reset (DSAR) equations. The paper presents a practical object-oriented approach to implementing the DSAR model. Each component of a system can be modeled autonomously. Connections between components are established by simple algebraic equations. Simulation of the model using numerically robust implicit integration requires the generation of partial derivatives. The object-oriented model structure allows this differentiation to be achieved symbolically without sacrificing simulation speed.