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The parameters of voltages in a power system are essential element of evaluation of power quality. The paper deals with deviations of voltage magnitudes from the predetermined values. One of the ways of reducing the mentioned deviations is reactive power optimization. At the beginning of the paper, dependence of the voltage magnitude at the end of the branch on reactive power flow on this branch is...
Excessive reactive power flows are an important problem in a power system. Optimization of reactive power flows in the system allows reducing them. This paper deals with optimization of reactive power flows in the national power system. Effects of two variants of this optimization are presented. One of them is when voltage magnitudes at generation nodes, on-load tap changer positions, and reactive...
The paper concerns the problem of the Reactive Power Planning (RPP), being one of the most challenging problems in power system analyses. The authors present theoretical background for the proposed optimization method of RPP from the viewpoint of the economic aspect. If an objective function is the Return On Investment (ROI) in new RPSs in a power system, then solution of RPP ensures the highest efficiency...
The Unified Power Flow Controller is the most advanced device of FACTS family. It is able to control active and reactive power and voltage magnitude simultaneously. A control range of these system parameters is dependent on UPFC's inverter constraints and also on operating conditions of the power system. In this paper, the results of investigations of influence of UPFC constraints and operating conditions...
Optimization of reactive power flow is one of the problems of optimal power flow in a power system. Solution of that problem has positive impact on economic and safe power system operation. Aim of the paper is to present the investigation of results of optimization of reactive power flow in a power system with the use of genetic algorithms for two different objective functions from the voltage-stability...
The paper presents comparative studies of state estimation for a power system with and without the UPFC device. Weighted least squares state estimation is considered. Such parameters of state estimation are taken into account as: the condition number of the gain matrix, parameters characterizing accuracy of estimation results, and number of iterations in a computational process. During investigation,...
Creating a correct power network connectivity model is very important stage of power system real-time modeling. Errors in this model may seriously degrade credibility of results of power system applications and implicate improper and potentially danger control actions. In this situation, checking correctness of power network topology model is of great importance. The aim of the paper is to present...
The paper presents a comparative investigations of the state estimation of a power system with UPFC in the polar and rectangular coordinate systems, paying special attention to types of utilized measurements. The estimation with the use of the weighted-least-squares method is considered. During investigations, impact of a coordinate system, in which the state vector is considered, stress of a power...
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