Abstract
Every optimization problem employed to study electric power systems consists of an objective function and a group of constraints to be observed by this function that concurrently define the problem itself. The main constraints associated with the problem of reactive power planning are related to load flow equations. These problems are widely known as optimum load flow. Current operating conditions of reactive systems imply the necessity of redefining the reactive power planning problem, though bearing in mind its performance under normal conditions and faults or disturbances. The employment of these constraints by the planning of reactive power leads to a second optimization model known as optimum load flow with security constraints. Finally, more recent studies have raised the possibility of including voltage stability into the objective function, as well as into the problem constraints of reactive power planning, to maximize the voltage stability margin. Thus, a third optimization problem is derived, namely optimum load flow with security and voltage stability constraints. This optimization method aims to guarantee the existence of voltage stability margins in the system under faults and disturbances.
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Amaris, H., Alonso, M., Ortega, C.A. (2013). Reactive Power Optimization. In: Reactive Power Management of Power Networks with Wind Generation. Lecture Notes in Energy, vol 5. Springer, London. https://doi.org/10.1007/978-1-4471-4667-4_4
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