Operation and transmission expansion planning of integrated ac-dc power systems
This dissertation first develops an efficient solution technique for solving the steady-state electrical conditions of an integrated ac-dc power system based on the observation that the equivalent loads representing the dc network are independent of the ac load-flow solution. The absence of iterations back and forth between ac and dc load flows, a constant dc Jacobian matrix, and the ability to interface with any existing ac load flow make this technique very fast, efficient and reliable. The first formulation uses a sensitivity approach to ac-dc transmission expansion planning where sensitivity coefficients are defined in order to compare the effectiveness of different ac and/or dc equipment additions. The construction of a temporary connected ac network is required to guarantee meaningful sensitivity coefficients with respect to the interconnecting ac right-of-ways. Based on the potential controllability of dc networks, a network-flow approach is defined with respect to the interconnecting dc right-of-ways. With the changes in the ac and/or dc equipment being considered as discrete variables, a mixed-integer linear programming technique is used for finding feasible plans minimizing investment and operating costs. The second formulation is the only one to date which combines an efficient ac-dc load-flow model with an exact treatment of the discrete nature of the equipment additions. This formulation does not use any sensitivity coefficients with respect to the ac and/or dc equipment, but still uses mixed-integer linear programming techniques. It constitutes an efficient implicit enumeration of all possible configurations which can be given to the ac-dc transmission network, each of them being characterized by its own set of load-flow equations.
- OSTI ID:
- 6272313
- Resource Relation:
- Other Information: Thesis (Ph. D.)
- Country of Publication:
- United States
- Language:
- English
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POWER TRANSMISSION
AC SYSTEMS
DC SYSTEMS
LOAD MANAGEMENT
MATHEMATICAL MODELS
NUMERICAL SOLUTION
ENERGY SYSTEMS
MANAGEMENT
POWER SYSTEMS
200301* - Power Transmission & Distribution- AC Systems
EHV & UHV- (-1989)
200302 - Power Transmission & Distribution- DC Systems- (1989-)