Addressing short term voltage stability problem - Part I: Challenges and plausible solution directions

This paper is the first of a two-part paper presenting issues related to short term voltage stability problem and then providing possible solution options that can ensure the security of the system. Lately power system planners are frequently encountering voltage problems in short term. Placement of dynamic VAR device in the system is one preferred option. However, there is little research done in the field of dynamic VAR allocation to ensure short term voltage stability and no industry grade tool exists. Part I explores the challenges faced while solving dynamic VAR allocation problem. The problem is complex as it requires proper selection of dynamic model; and consideration of contingencies and system dynamics in the optimization problem which leads to large problem size. Hence, this paper explores different solution methodologies; and finally proposes a novel approach to solve the optimization problem. Part II of this paper provides numerical results that demonstrate the application of the proposed approach.