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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Journal ArticleDOI
Optimal allocation of active and reactive power of dispatchable distributed generators in a droop controlled islanded microgrid considering renewable generation and load demand uncertainties
Nibir Baran Roy,Debapriya Das +1 more
TL;DR: A novel mixed probabilistic-possibilistic scenario based approach (MPPSBA) is put forward to model the uncertainties associated with both the electrical and heat load demand and renewable distributed generator output.
Journal ArticleDOI
New metrics for assessing the performance of multi-microgrid systems in stand-alone mode
TL;DR: A multi-step performance assessment method for multi-microgrid systems is proposed, which considers different reliability requirements and economic characters of critical and non-critical loads as well as the energy exchange among microgrids and with the main grid for effectively calculating the proposed metrics.
Proceedings ArticleDOI
Dynamic characteristics of a hybrid microgrid with inverter and non- inverter interfaced renewable energy sources: A case study
TL;DR: In this paper, a microgrid model was developed in DIgSILENT Power Factory based on the IEEE-13 bus system and comparative analysis has been carried out between inverter and non-inverter based renewable energy generators (REGs).
Journal ArticleDOI
Control parameter optimization for multiple distributed generators in a microgrid using particle swarm optimization
TL;DR: In this paper, an effective control parameter-tuning method using the particle swarm optimization (PSO) algorithm and gain-scheduling method is proposed to coordinate multiple microgrid generators for both grid-connected and autonomous modes.
Journal ArticleDOI
Simple control strategy for inverter-based distributed generator to enhance microgrid stability in the presence of induction motor loads
TL;DR: In this article, a transient control mode (TCM) based on droop design and flow management of current components is proposed to enable the microgrid to withstand transient faults and resume stable islanded operation.
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.