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This paper presents a very fast power system state estimating algorithm to solve the power system state estimation problem. Conventional techniques of state estimation, which are based on the Weighted Least Square (WLS) method, face many issues, including lack of observability, high sensitivity to model parameters and long calculation time in large power systems. The main objective of conventional WLS methods is to minimize a linear objective function, while the aim of the presented method is to improve the results of conventional algorithms and obtain the least minimum possible value of the linear objective function alongside solving the problems mentioned above, by means of an iterative method. The proposed approach is tested on IEEE 14, 30 and 57 bus test systems using MATLAB software. The results reflect the considerable performance of the proposed method. [ABSTRACT FROM AUTHOR]

This paper proposes a novel structure for fault current limiter (FCL), which not only controls the magnitude of fault current, but also is enable to power management in normal and fault condition of utility. The main capabilities of the proposed structure, which is able to connect both ac and dc systems, are controlling the dc reactor current for fault current magnitude control, and management and control of power flow from ac system to dc system. A boost converter is utilized in the proposed structure, that its output is connected to a dc bus, in order to control the dc reactor current. The proposed FCL, which ensures a high protection level of the system, has no impact on utility voltage and load currents. A boost converter is utilized to provide an almost sinusoidal input current. The simulation and experimental results are presented to clarify the theory and feasibility of the proposed FCL, which manifest simple structure of the circuit and show feasibility of the proposed FCL. [ABSTRACT FROM PUBLISHER]