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This paper describes the resolution of the optimal reactive dispatch (ORD) problem with respect to voltage magnitudes and taps of on-load tap changing (OLTC) transformers. Although the ORD consists in a large-scale mixed integer nonlinear programming (MINLP) problem due to the discrete nature of some system controls, most papers in technical journals disregard the discrete modeling of such variables...
This paper proposes a nonlinear programming (NLP) penalty-based strategy for solving the Volt/Var optimization (VVO) problem in distribution systems, formulated in a mixed integer nonlinear programming (MINLP) form. The VVO consists, basically, in determining the settings of the control variables of switched capacitor banks and on-load tap changer (OLTC) transformers located at substations to minimize...
This paper describes the resolution of the optimal reactive dispatch (ORD) problem with respect to voltage magnitudes and taps of on-load tap changing (OLTC) transformers. Although the ORD consists in a large-scale mixed integer nonlinear programming (MINLP) problem due to the discrete nature of some system controls, most papers in technical journals disregard the discrete modeling of such variables...
This paper describes the methodology to determine the optimum size and location of reactive compensation equipments. The proposed method is implemented with a new interior point optimum power flow program called IPSO (Integrated Power System Optimizer), developed by Tractebel Engineering. The proposed objective functions achieve the trade off between economic objectives (investment cost) and functional...
As a useful tool for combinatorial optimisation over continuous and discrete variables, the mixed-integer linear programming (MILP) approach can address complex control and planning models providing high computational efficiency as well as robust behavior. On power system planning, previous work using MILP employed conventional dc load flow model neglecting reactive power, power loss and transformer...
Secondary voltage control system is a significant segment of the hierarchical voltage control in power systems. Though voltage controller has both constant voltage regulators, such as generators and static reactive power compensators, and discrete voltage regulators, such as OLTC and shunt capacitors/reactors, traditional secondary voltage control (SVC) only consider constant voltage regulators. A...
In this paper, a hybrid optimization technique, in which immune genetic algorithm is combined with interior point method, is proposed for solving the dynamic reactive power optimization problem. The switching time limits of shunt capacitors and transformer tap ratios, which make the problem to be dynamic, are only related with discrete variables. In the proposed hybrid method, the immune genetic algorithm...
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