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The precise fault location is still an unsolved problem in distribution networks. The application of distributed generation (DG) increases the difficulty of fault location. The fault location in distribution network with DG has been becoming a hot and difficult subject. This paper proposes an impedance-based fault location method for distribution network with DG. First, the impedance models are built...
It is an important task to accurately estimate the Thevenin equivalent impedance seen from a load bus for power systems monitoring and control. The purpose of this paper is to investigate the mechanism and characteristics of the Thevenin equivalent impedance in a nonlinear circuit. A general model is introduced for investigating the Thevenin equivalent impedance in an analytical manner. Two typical...
Load modeling has a significant impact on power systems dynamic simulation and control. In this paper, an alternating least squares approach is proposed to decompose the nonlinear optimization problem of dynamic load parameter identification to two linear least squares problems, which can be solved in an alternating manner. A DFT-based numerical derivative technique is also proposed to attenuate the...
This paper reveals that the impedance match (or the Thevenin circuit) based voltage stability monitoring techniques have problems to predict voltage stability limits when applied to multi-load power systems. Power system loads are nonlinear and dynamic. They cannot be simply represented as Thevenin circuit parameters for impedance match analysis. To overcome these difficulties, a new concept called...
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