Journal ArticleDOI
Micro-grid autonomous operation during and subsequent to islanding process
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TLDR
In this paper, the authors investigated preplanned switching events and fault events that lead to islanding of a distribution subsystem and formation of a micro-grid, and they concluded that an appropriate control strategy for the power electronically interfaced DG unit can ensure stability of the microgrid and maintain voltage quality at designated buses, even during islanding transients.Abstract:
This paper investigates (i) preplanned switching events and (ii) fault events that lead to islanding of a distribution subsystem and formation of a micro-grid. The micro-grid includes two distributed generation (DG) units. One unit is a conventional rotating synchronous machine and the other is interfaced through a power electronic converter. The interface converter of the latter unit is equipped with independent real and reactive power control to minimize islanding transients and maintain both angle stability and voltage quality within the micro-grid. The studies are performed based on a digital computer simulation approach using the PSCAD/EMTDC software package. The studies show that an appropriate control strategy for the power electronically interfaced DG unit can ensure stability of the micro-grid and maintain voltage quality at designated buses, even during islanding transients. This paper concludes that presence of an electronically-interfaced DG unit makes the concept of micro-grid a technically viable option for further investigations.read more
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Dissertation
Converter Interfaced Distributed Generation - Grid Interconnection Issues
TL;DR: In this paper, a voltage source converter (VSC) with two different line filters, namely an inductance filter and a capacitance-capacitance-inductance filter (LCL-filter), is used to calculate the maximum currents that would flow through the VSC valves during voltage dips.
Proceedings ArticleDOI
Impact of variation of energy resources on voltage stability of a micro grid
TL;DR: The effect of DERs on voltage stability when the MG system operates under the normal condition and after different types of faults occur in the system are discussed.
Journal ArticleDOI
Grid-Connected and Seamless Transition Modes for Microgrids: An Overview of Control Methods, Operation Elements, and General Requirements
TL;DR: In this paper , the authors focused on the analysis of control methods for AC microgrids and AC power systems, therefore, they did not enter in detail or investigate profoundly the topologies applied in the power electronics structures nor DC microgriders and DC power systems.
Proceedings ArticleDOI
A study on active power and frequency response in microgrid
TL;DR: In this paper, the active power and frequency response in a multiple-DG microgrid with respect to different configurations (parallel/series) and different control modes (UPC/FFC) is investigated.
Proceedings ArticleDOI
Seamless switching control base on fuzzy PID for micro-grid with wind and solar power
Xi Sinan,Qi Zhiyuan +1 more
TL;DR: Simulation research shows suggested control method can make micro-grid seamless switching between independent operation and grid-connected operation.
References
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Book
Electrical Power Systems Quality
TL;DR: In this paper, the authors present a power quality evaluation procedure for the purpose of measuring the power quality of a power supply. But, they do not define the specific classes of power quality problems.
Vector analysis and control of advanced static VAr compensators
TL;DR: The advanced static VAr compensator (ASVC) as mentioned in this paper is based on the principle that a self-commutating static inverter can be connected between three-phase AC power lines and an energy storage device, such as an inductor or capacitor, and controlled to draw mainly reactive current from the lines.
Journal ArticleDOI
Vector analysis and control of advanced static VAr compensators
C. Schauder,H. Mehta +1 more
TL;DR: In this paper, two fundamentally different types of invertor can be used for this purpose, one providing control of output voltage magnitude and phase angle, and the other having only phase angle control.
Journal ArticleDOI
Protection against loss of utility grid supply for a dispersed storage and generation unit
TL;DR: In this paper, the requirements of an islanding, or "loss of grid", protection for a dispersed storage and generation unit are examined, and the principal methods used for this type of relaying are outlined.
Proceedings ArticleDOI
Distributed energy sources: technical challenges
TL;DR: In this article, the main related technical issues are discussed together with the DGs modelling requirements for their analysis, and the main technical issues of the micro-grid are discussed and discussed in detail.