Short term voltage stability poses a significant threat to system stability and reliability. This paper applies dynamic VAr injection to ensure short term voltage stability following a large disturbance in a power system with high concentration of induction motor loads. Decelerating and stalling of induction motor loads is considered to be the major cause of fault induced delayed voltage recovery (FIDVR) and short term voltage stability. If system dynamics are not taken into account properly, the proposed control solution may be an expensive over design or an under design that is not capable of eliminating FIDVR problems completely. In this work, the optimal amount and locations for installing dynamic reactive resources are found by control vector parameterization (CVP), a dynamic optimization approach. The efficiency and effectiveness of this approach is improved by utilizing results from trajectory sensitivity analysis, singular value decomposition and linear programming optimization. Dynamic optimization based on CVP approach is tested in an IEEE 162-bus system and a realistic large scale utility power system.

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Constraint relaxations by definition mean that certain constraints are allowed to be violated in energy market models for a pre-determined penalty price. System operators utilize this mechanism in an effort to impose a price-cap on shadow prices in the markets. In addition, constraint relaxations can serve as corrective approximations that help to reduce the occurrence of infeasible or extreme solutions in market models. This work aims to capture the impact constraint relaxations have on AC operating conditions. Moreover, this analysis also provides a better understanding of the correlation between DC market models and AC systems and analyzes how relaxations in market models propagate to system operations. This information can be used to assess the risk associated with constraint relaxations. The practice of constraint relaxations was replicated in this work using a test case and a real-life large-scale system, while capturing both energy market aspects and AC system performance. System performance investigation included static and dynamic security analysis for base-case and post-contingency conditions. Index Terms-Optimal power flow, power generation dispatch, power system economics, power system security, power system simulation, power system stability.

This paper contains a discussion of innovative high voltage DC technologies for transmission systems. The main subjects are multiterminal systems, and meshed (networked) systems. These systems are motivated by reliability requirements and expected large scale increase in generation resources far from load centers. A further motivation is the maximal use of transmission rights of way for bulk power transmission applications. Examples are shown taken from the western interconnection in North America although the general applicability elsewhere is highlighted. Index Terms-High voltage DC, transmission engineering, power systems engineering, western interconnection.