Journal ArticleDOI
Modeling, Analysis and Testing of Autonomous Operation of an Inverter-Based Microgrid
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TLDR
In this paper, the authors developed a model for autonomous operation of inverter-based micro-grids, where each sub-module is modeled in state-space form and all are combined together on a common reference frame.Abstract:
The analysis of the small-signal stability of conventional power systems is well established, but for inverter based microgrids there is a need to establish how circuit and control features give rise to particular oscillatory modes and which of these have poor damping. This paper develops the modeling and analysis of autonomous operation of inverter-based microgrids. Each sub-module is modeled in state-space form and all are combined together on a common reference frame. The model captures the detail of the control loops of the inverter but not the switching action. Some inverter modes are found at relatively high frequency and so a full dynamic model of the network (rather than an algebraic impedance model) is used. The complete model is linearized around an operating point and the resulting system matrix is used to derive the eigenvalues. The eigenvalues (termed "modes") indicate the frequency and damping of oscillatory components in the transient response. A sensitivity analysis is also presented which helps identifying the origin of each of the modes and identify possible feedback signals for design of controllers to improve the system stability. With experience it is possible to simplify the model (reduce the order) if particular modes are not of interest as is the case with synchronous machine models. Experimental results from a microgrid of three 10-kW inverters are used to verify the results obtained from the modelread more
Citations
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Proceedings ArticleDOI
Angle droop versus frequency droop in a voltage source converter based autonomous microgrid
TL;DR: In this article, the performance of angle and frequency droops in an autonomous microgrid that only contains voltage source converter (VSC) interfaced distributed generators (DGs) is compared.
Journal ArticleDOI
Evolution of microgrids with converter-interfaced generations: Challenges and opportunities
TL;DR: A comprehensive list of challenges and opportunities supported by a literature review on the evolution of converter-based microgrids is presented, describing the challenges and benefits of using DG units in a distribution network and then those of microgrid ones.
Journal ArticleDOI
A survey on modeling of microgrids-From fundamental physics to phasors and voltage sources
Johannes Schiffer,Daniele Zonetti,Romeo Ortega,Aleksandar M. Stankovic,Tevfik Sezi,Jörg Raisch +5 more
TL;DR: This paper presents detailed dynamical models of the main microgrid components and clearly state the underlying assumptions which lead to the standard reduced model representation with inverters represented as controllable voltage sources, as well as static network interconnections and loads.
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Highly Accurate Derivatives for LCL -Filtered Grid Converter With Capacitor Voltage Active Damping
TL;DR: In this article, two derivatives of the LCL filter voltage were proposed, based on either second-order or non-ideal generalized integrator, to match the ideal s-function closely.
Journal ArticleDOI
Stochastic Modeling and Optimization in a Microgrid: A Survey
Hao Liang,Weihua Zhuang +1 more
TL;DR: In this paper, the authors investigate the key features of micro-grids and provide a comprehensive literature survey on the stochastic modeling and optimization tools for a microgrid, and identify future research directions.
References
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Book
Power System Stability and Control
TL;DR: In this article, the authors present a model for the power system stability problem in modern power systems based on Synchronous Machine Theory and Modelling, and a model representation of the synchronous machine representation in stability studies.
Journal ArticleDOI
Control of parallel connected inverters in stand-alone AC supply systems
TL;DR: In this article, a control scheme for parallel-connected inverters in a standalone AC supply system is presented, which uses feedback of only those variables that can be measured locally at the inverter and does not need communication of control signals between the inverters.
Journal ArticleDOI
Operation of a multiagent system for microgrid control
Aris Dimeas,Nikos Hatziargyriou +1 more
TL;DR: In this paper, the authors present the operation of a multiagent system (MAS) for the control of a microgrid and a classical distributed algorithm based on the symmetrical assignment problem for the optimal energy exchange between the production units of the Microgrid and the local loads, as well the main grid.
Journal ArticleDOI
A wireless controller to enhance dynamic performance of parallel inverters in distributed generation systems
TL;DR: In this paper, a novel control strategy for parallel inverters of distributed generation units in an AC distribution system is presented, based on the droop control method, using only locally measurable feedback signals.
Journal ArticleDOI
Design, analysis, and real-time testing of a controller for multibus microgrid system
TL;DR: In this paper, the design and analysis of a unified controller for multibus microgrid system is presented, which includes inner voltage and current loops for regulating the three-phase grid-interfacing inverter, and external power control loops for controlling real and reactive power flow and for facilitating power sharing between the paralleled DG systems.