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This paper presents a new out-of-step detection method for multi-machine power systems based on approximate stability boundaries. The boundaries are constructed based on Zubov's method of stability analysis. The proposed out-of-step detection method first constructs a series of boundaries in power angle - frequency (δ-ω) plane, and tracks the trajectory of each generator in the δ-ω plane after the...
The changes in branch flows and nodal voltages with respect to a change in current injection at a particular node, defined as current transfer distribution factors (CTDF), are useful sensitivity factors for distribution system analysis. In addition, the changes in branch flows due to the outage of a particular branch, defined as branch outage distribution factors (BODF), are useful in many distribution...
In this paper a recently proposed variation of the Krylov subspace method for model reduction is applied to power systems. The technique allows to easily enforce constraints on the reduced order model. Herein this is used to preserve the slow and poorly damped modes of the systems in the reduced order model. We analyze the role that these modes have in obtaining a good approximation and we show that...
In a droop-controlled High Voltage Direct Current (HVDC) grid, the line voltage drops throughout the system influence the voltage control. This paper introduces and compares five distinct methods for establishing droop setpoints in order to restore the voltage profile after a contingency and evaluates the ability of these methods to track the setpoints. Furthermore, the influence of the network and...
Power flow solvable boundary plays an important role in contingency analysis, security assessment, and planning processes. However, to construct the real solvable boundary in multidimensional parameter space is burdensome and time consuming. In this paper, we develop a new technique to approximate the solvable boundary of distribution systems based on Banach fixed point theorem. Not only the new technique...
Large-scale wind farm integration poses challenges to the modeling and simulation of power system electromagnetic transients. In this paper, state space modeling of typical induction generator wind farms is demonstrated using a subsystem assembly process, and a novel matrix exponential based simulation algorithm is applied, which is efficient, stable, and especially suitable for high dimensional nonlinear...
A fast and accurate state space model of a multiple body wave energy converter (WEC) is developed in this paper. The purpose of this model is to expedite the development of the advanced controls critical to improving WEC performance. Although it possible to directly couple controller code with some - but not all - high resolution time domain simulation tools (WaveDyn, WEC-Sim, etc.), it can be much...
This paper presents alternatives for the calculation of locational marginal prices in electric power distribution systems. Although a distribution class locational marginal price (DLMP) is at the conceptual stage, the use of a DLMP has recognized potential for circuit loading strategies and energy and power flow control. The use of quadratic programming with the application of loss factors for the...
In this paper, the merits of Adomian Decomposition Method (ADM) have been investigated for the time domain simulation of multi-machine power systems. ADM is an analytical approximation method for the solution of linear, nonlinear, deterministic and stochastic operator equations. It approximates the nonlinearities in the equations using Adomian polynomial series and that can form a rapidly convergent...
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