Journal ArticleDOI
Dynamic equivalencing of distribution networks with dispersed generation using Hankel norm approximation
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TLDR
In this article, a brief review of existing techniques for aggregation and order-reduction of distribution networks with dispersed generators is provided, and the dynamic reduction using Hankel norm approximation is performed for a 10 kV distribution network, which includes DG of different types.Abstract:
Nowadays the number of dispersed generators (DGs) is growing rapidly. This change will greatly influence power system dynamics. A distribution network, where DGs are connected to the grid, cannot be considered as passive anymore. Therefore, in the future it will not be possible to use simple equivalents of distribution networks for power system dynamic modelling, as it was done before. At the same time, the whole power system cannot generally be represented in a detailed manner for dynamic studies because of huge system dimension. Therefore special techniques have to be applied for aggregation and order-reduction of distribution networks with DG. A brief review of existing techniques is provided here, and the dynamic reduction using Hankel norm approximation is performed for a 10 kV distribution network, which includes DG of different types.read more
Citations
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Journal ArticleDOI
Elementary Operation Approach to Order Reduction for Roesser State-Space Model of Multidimensional Systems
TL;DR: It turns out that the new proposed approach is applicable to a wider class of Roesser models than the existing reduction approaches and provides a possible way to explore the equivalence between two systems.
Proceedings ArticleDOI
Aggregated Dynamic Equivalent of a Distribution System Hosting Inverter-Based Generators
TL;DR: An equivalent, i.e. a reduced-order model, of active distribution networks is derived, for use in (phasor-mode) dynamic simulations of large-disturbances, and its parameters are tuned in the least-square sense to match the dynamic responses of the unreduced system to several training disturbances.
Journal ArticleDOI
Small signal equivalent model of synchronous generator-based grid-connected microgrid using improved Heffron-Phillips model
TL;DR: The ultimate aim of this study is to estimate parameters of LEM such that it behaves as a nonlinear detailed model (NDM).
Journal ArticleDOI
Hankel-Norm-Based Model Reduction for Stochastic Discrete-Time Nonlinear Systems in Interval Type-2 T–S Fuzzy Framework
Yi Zeng,Hak-Keung Lam,Ligang Wu +2 more
TL;DR: A convex Hankel-norm-based model reduction approach subject to conditions in the form of linear matrix inequalities (LMIs) is obtained and a membership-functions-dependent (MFD) technique is applied to capture the information of IT2 membership functions and reduce the conservativeness.
Proceedings ArticleDOI
Network-cognizant model reduction of grid-tied three-phase inverters
TL;DR: This work has shown that a system of parallel-connected grid-tied three-phase inverters can be modeled as one aggregated inverter unit with the same structure and state-space dimension as any individual inverter in the system, and extends this result to networks with arbitrary topologies by leveraging a classical aggregation method for coherent synchronous generators in transmission networks.
References
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Journal ArticleDOI
All optimal Hankel-norm approximations of linear multivariable systems and their L, ∞ -error bounds†
TL;DR: In this paper, a complete characterization of all rational functions that minimize the Hankel-norm is derived, and the solution to the latter problem is via results on balanced realizations, all-pass functions and the inertia of matrices, all in terms of the solutions to Lyapunov equations.
Book
Model Reduction for Control System Design
TL;DR: In this article, model and controller reduction based on Coprime Factorization (CF) is proposed for low-order controller design, where the model is reduced by multiplicative approximation and the controller is reduced based on time factorization.
Journal ArticleDOI
Development of models for analyzing the load-following performance of microturbines and fuel cells
Y. Zhu,Kevin Tomsovic +1 more
TL;DR: In this article, the authors presented simplified slow dynamic models for microturbines and fuel cells and evaluated their stand-alone dynamic performances in a distribution system embedded with a micro-turbine plant and an integrated fuel cell power plant.
Journal ArticleDOI
Identification of Coherent Generators for Dynamic Equivalents
TL;DR: In this article, the authors describe the development and evaluation of a method for identifying the coherency behavior of generators for various power system disturbances and use this information as a basis for forming dynamic equivalents which can be applied in transient stability studies.