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Co-Optimization of Multi-Stage Transmission Expansion Planning and Grid Operation

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The ongoing transformation of the power system characterized by an increased share of renewable energy sources requires additional transmission capacities. Nevertheless, the need for new transmission capacities can be reduced by optimizing grid operation. This contribution presents a novel approach to the co-optimization of multi-stage transmission expansion planning and grid operation within a mixed-integer linear programming formulation. The expansion via AC systems and phase shifting transformers (PSTs) is combined with the control of PSTs and the determination of congestion management interventions such as redispatch of power plants or curtailment of renewable energies. The number of potential expansion candidates is reduced by linear programming relaxations. Exemplary results based on a synthetic test system containing 120 buses evidence the impact of the proposed approach on overall system costs. The proposed co-optimization reduces the total costs by 16.5 % when applied instead of the sole expansion via AC technology.

Author(s):

Marco Franken    
RWTH Aachen University
Germany

Alexander B. Schrief    
RWTH Aachen University
Germany

Hans Barrios    
Siemens PTI
Germany

Ralf Puffer    
RWTH Aachen University
Germany

Albert Moser    
RWTH Aachen University
Germany

 

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