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Topology-Cognizant Optimal Power Flow in Multi-Terminal DC Grids.
- Source :
- IEEE Transactions on Power Systems; Sep2021, Vol. 36 Issue 5, p4588-4598, 11p
- Publication Year :
- 2021
-
Abstract
- In this paper, we propose a topology-cognizant optimal power flow (OPF) paradigm with additional safety constraints for multi-terminal direct current (MTDC) grids. The resulting formulation is concerned with the optimization of controller set-points, i.e., voltage and power levels at each bus, and the switching status of transmission lines that collectively referred to as grid topology. A pair of additional safety constraints are integrated into the problem formulation to prevent voltage violations caused by power fluctuations in between two controller set-point updates. Searching for a grid topology that offers more efficient operation leads to a mixed-integer nonlinear program (MINLP) which is computationally challenging due to: i) Non-convex power flow equations, (ii) Non-convex converter loss equations, and iii) Binary variables accounting for the operational status of transmission lines. Non-convexities of power flows and converter loss equations are tackled by means of a mixed-integer second-order cone programming (MISOCP) relaxation, while the optimal switching status of transmission lines are determined via a branch-and-bound search. Numerical results for the modified IEEE 14, 30, and 57-bus systems are used to verify the merits of the proposed method. Furthermore, this method is experimentally validated using the CIGRE B4 DC grid benchmark in a real-time hardware-in-the-loop platform. [ABSTRACT FROM AUTHOR]
- Subjects :
- ELECTRICAL load
TRANSMISSION line matrix methods
ELECTRIC lines
Subjects
Details
- Language :
- English
- ISSN :
- 08858950
- Volume :
- 36
- Issue :
- 5
- Database :
- Complementary Index
- Journal :
- IEEE Transactions on Power Systems
- Publication Type :
- Academic Journal
- Accession number :
- 153188166
- Full Text :
- https://doi.org/10.1109/TPWRS.2021.3067025