Optimal power flow with stability constraints
- Autores: Rafael Zarate Miñano
- Directores de la Tesis: Antonio Jesús Conejo Navarro (dir. tes.), Federico Milano (codir. tes.)
- Lectura: En la Universidad de Castilla-La Mancha ( España ) en 2010
- Idioma: español
- Tribunal Calificador de la Tesis: Antonio Gómez Expósito (presid.), José Luis Polo Sanz (secret.), Massimo La Scala (voc.), Luis Rouco Rodríguez (voc.), Thierry Van Cutsem (voc.)
- Materias:
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- Resumen
Most existing electricity markets provide dispatch solutions that are based on economic grounds and, generally, do not explicitly consider security issues. As a result, during real-time operation, the system operator must check system security and implement control actions as necessary. This includes three primary tasks: security assessment, contingency filtering, and security control. In addition, market participants expect that the security control modifies as little as possible the market dispatch solution. In order to ensure that the security adjustments minimally impact the original market solution, it is necessary to model the behaviour of the system and the security constraints in detail. As a consequence, the system operator typically has to deal with a nonlinear model and advanced stability analysis concepts, such as bifurcation theory.
In this thesis, OPF-based preventive control tools to assist system operators in avoiding security problems related to voltage, small-signal, and transient instability are proposed. The starting point of the analysis is a market dispatch solution adjusted by losses. The proposed procedures are mainly of three types: security assessment, contingency filtering, and security control procedures. The characteristics of the security assessment and contingency filtering procedures depend on the instability phenomenon of interest. The security control procedures are basically redispatching procedures based on OPF problems that incorporate stability constraints. The form of these constraints depends on the instability phenomena that limit the system security. Although, for clarity, the proposed procedures for each instability problem are presented separately, they belong to a unified procedure. The performance of the proposed procedures is tested on several power systems, including a real-world power system. The results show that the proposed procedures are useful tools for system operators because they ensure the secure operation of current power systems.
