Resumen de Transient stability constrained optimal power flow: improved models and practical applications
Transient Stability Constrained-Optimal Power Flow (TSC-OPF) is a useful tool to calculate the optimal operating point of a power system, while ensuring its stability after severe disturbances. The aim of this thesis is to advance in the development of an effective tool for economic and dynamic power system security assessment. Starting from the TSC-OPF models presented in the literature, the goal is to improve the representation of the dynamics of the systems in practical situations, implementing similar models to those used in dynamic simulations as usually performed by power system operators. Also, conventional solvers are used to obtain the solution of the TSC-OPF.
In order to achieve this objective, a synchronous generator dynamic transient dq axes model is implemented, with an excitation system and a turbine governor. The dynamic trajectories of all generators are retained in the optimization process. In addition, a model of High Voltage Direct Current (HVDC) link is implemented, modelling the dynamic response of the device to disturbances in the AC network.
The models of TSC-OPF include equations for conventional power flow, operation technical constraints, technical limitations of the power system equipment and a set of differential equations describing the system model for transient stability analysis. For discretizing these differential equations, trapezoidal rule is used.
Several studies are performed: optimal economic dispatch ensuring the transient stability of the system; maximum loadability of the system; optimization of the dynamic response of the HVDC link; and economic effect of fault clearing time on the generation cost.
The application of the proposed TSC-OPF to various cases of study shows the effectiveness of the formulation and the feasibility of its application to real problems.
