The allocation of a variable series reactor considering AC constraints and contingencies

Abstract

The Variable Series Reactors (VSRs) can efficiently control the power flow through the adjustment of the line reactance. When they are appropriately allocated in the power network, the transmission congestion and generation cost can be reduced. This paper proposes a planning model to optimally allocate VSRs considering AC constraints and multi-scenarios including base case and contingencies. The planning model is originally a non-convex large scale mixed integer nonlinear program (MINLP), which is generally intractable. The proposed Benders approach decomposes the MINLP model into a mixed integer linear program (MILP) master problem and a number of nonlinear subproblems. Numerical case studies based on IEEE 118-bus demonstrate the high performance of the proposed approach.

Maximizing Branch Power Flows as a Descriptive Structural Metric for Electrical Networks

“…By comparing loadability with available thermal capacity, the most congestion-prone branches within a power system can be directly identified, and these may be apt candidates for uprating [14]- [16] or for the addition of static or controllable reactance [11]- [13].…”

“…The novel optimization-based screening procedure permits exploration of power system congestion in a general sense, by identifying the subset of branches which are at least theoretically capable of being loaded beyond their thermal limits. Identifying the congestion-prone branches within a system should offer actionable insights for identifying and validating remedial measures, such as strategically removing [9], [10] or increasing the reactance [11]- [13] of particular lines to better balance power flows, or selectively uprating [14]- [16] particular branches. Other potential applications for the procedure are prioritising maintenance planning [17] and identifying anomalous lines (those with unusually high or low loabability) for further investigation.…”

Series Compensation of Transmission Systems: A Literature Survey

“…In References [224,225], the original Mixed-integer non-linear programming (MINLP) model is transformed into MILP model to enable the planning model to be directly applied to practical large-scale systems. A similar approach was presented in Reference [226], in which an approximation method to linearize the model in the structure of the Benders decomposition algorithm is proposed.…”