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Hydrothermal Scheduling in the Continuous-Time Framework

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Continuous-time optimization models have successfully been used to capture the impact of ramping limitations in power systems. In this paper, the continuous-time framework is adapted to model flexible hydropower resources interacting with slow-ramping thermal generators to minimize the hydrothermal system cost of operation. To accurately represent the nonlinear hydropower production function with forbidden production zones, binary variables must be used when linearizing the discharge variables and the continuity constraints on individual hydropower units must be relaxed. To demonstrate the performance of the proposed continuous-time hydrothermal model, a small-scale case study of a hydropower area connected to a thermal area through a controllable high-voltage direct current (HVDC) cable is presented. Results show how the flexibility of the hydropower can reduce the need for ramping by thermal units triggered by intermittent renewable power generation. A reduction of 34% of the structural imbalances in the system is achieved by using the continuous-time model.

Author(s):

Christian Naversen    
NTNU
Norway

Arild Helseth    
SINTEF Energy Research
Norway

Bosong Li    
University of Utah
United States

Masood Parvania    
University of Utah
United States

Hossein Farahmand    
NTNU
Norway

João Catalão    
University of Porto and INESC TEC
Portugal

 

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