Abstract
An increased use of variable generation technologies such as wind power and photovoltaic generation can have important effects on system frequency performance during normal operation as well as contingencies. The main reasons are the operational principles and inherent characteristics of these power plants like operation at maximum power point and no inertial response during power system imbalances. This has led to new challenges for Transmission System Operators in terms of ensuring system security during contingencies. In this context, this paper proposes a Robust Unit Commitment including a set of additional frequency stability constraints. To do this, a simplified dynamic model of the initial system frequency response is used in combination with historical frequency nadir data during contingencies. The proposed approach is especially suitable for power systems with cost-based economic dispatch like those in most Latin American countries. The study is done considering the Northern Interconnected System of Chile, a 50-Hz medium size isolated power system. The results obtained were validated by means of dynamic simulations of different system contingencies.
Highlights
The increased use of variable generation technologies (VGTs) such as wind power and PV generation has led to new challenges for TSOs, especially from a frequency viewpoint [1,2,3]
Where y is a vector containing the commitment state of the synchronous generators (SGs), N is the number of generators, yit is the state of unit i in period t, Hi is the inertia constant of unit i, Si is the nominal power of unit i, and Sb is the common system base
This paper proposes a Robust Unit Commitment (RUC) including a set of frequency stability
Summary
The increased use of variable generation technologies (VGTs) such as wind power and PV generation has led to new challenges for TSOs, especially from a frequency viewpoint [1,2,3]. Current security practices used in the Unit Commitment (UC) process may fail in ensuring system stability during major power imbalances, especially in periods with high injections of inertia-less VGTs. During the last few years, only a few research works have been published in the field of economic dispatch models including system frequency constraints [2,4,5,6]. The contribution of this paper is to develop a RUC model able to deal with both wind power uncertainty during normal operation and large power imbalances from a frequency stability standpoint. This is accomplished by introducing the abovementioned constraints into the RUC formulation. The scope of the present study is the development of a UC model able to deal with wind power uncertainty during normal operation and robust during contingencies from a frequency stability standpoint
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