Power Grid Operation in a Market Environment by Chen Hong;
Author:Chen, Hong; [Chen, Hong]
Language: eng
Format: epub
ISBN: 9781119082927
Publisher: Wiley
Published: 2016-09-27T00:00:00+00:00
PART III
STOCHASTIC APPLICATIONS
CHAPTER 5
SECURITY-CONSTRAINED UNIT COMMITMENT WITH UNCERTAINTIES
Lei Wu and Mohammad Shahidehpour
RECENT BLACKOUTS IN THE United States and throughout the world have provided a growing evidence that security continues to be the most important aspect of power system operations. The fundamental tool in calculating the limits for the secure and economic operation of power systems is security-constrained unit commitment (SCUC), which has been widely utilized by independent system operators (ISOs) and regional transmission organizations (RTOs) to clear short-term electricity markets. The SCUC solution provides an hourly generation schedule for supplying the power system demand and meeting the security margin, and an hourly generating reserve schedule for satisfying operating constraints when unexpected changes occur in the power system demand or when the power system faces sudden contingencies.
The rapid deployment of variable and distributed renewable generation and the use of flexible demand response (DR) resources in emerging electric power systems have increased the system variability and presented new challenges to ISOs and RTOs and their operations. Such variabilities together with other uncertain factors in power systems, such as random outages of generation and transmission assets and forecast errors pertaining to hourly loads, availability of renewable energy resources, and market prices for electricity and fossil fuels may result in power supply shortages, excessive frequency fluctuations, and even regional brownouts and blackouts. Hence, the impact of potential uncertainties on power system security is of fundamental importance, especially when multiple uncertain factors are considered simultaneously in the power system operation and control. However, incorporating such uncertainties into the stochastic SCUC model is challenging in particular when we have already considered difficulties in the modeling of large-scale deterministic SCUC problem.
This chapter reviews the state-of-the-art modeling and solution methodologies for a deterministic SCUC and extends the results to the solution of SCUC with uncertainties (including the solution methods pertaining to robust optimization-based SCUC, stochastic programming-based SCUC, and chance-constrained optimization-based SCUC), for effectively managing uncertainties and enhancing the economics and security of power system operations. Numerical case studies are included in this chapter, which indicate the effectiveness of the listed models and solution methodologies with substantial practical and computational requirements as we consider the operational security of power systems under uncertainties. The major challenge remains to be the computational performance of the SCUC models in practical and large-scale power systems, which indicates that further research is required on such extremely challenging operation problems for improving the economics and security of electric power systems.
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