Some Aspects of Stability in Microgrids

Majumder, Ritwik

doi:10.1109/tpwrs.2012.2234146

Cited by 358 publications

(166 citation statements)

References 32 publications

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“…Since w min is selected according to (18) with V g = E * , the current-limiting property is guaranteed for any V g ≤ E * and for any frequency ω g , i.e., under grid variations (non-stiff grid) and grid faults. This is particularly interesting because, when the grid voltage drops, the current will normally increase to high values.…”

Section: Operation Under Grid Variations and Faultsmentioning

confidence: 99%

“…The stability of droop control methods have been extensively investigated in the literature, by using the smallsignal modeling of the system and linearization methods [18]- [21]. However, the stability of droop-controlled inverters that include the nonlinear model of the closed-loop system have not been adequately demonstrated, partially due to the high complexity of the nonlinear dynamics resulted from the nonlinear expressions of the real and the reactive power.…”

mentioning

confidence: 99%

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Current-Limiting Droop Control of Grid-Connected Inverters

Zhong

Konstantopoulos

2017

IEEE Trans. Ind. Electron.

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Abstract-A current-limiting droop controller is proposed for single-phase grid-connected inverters with an LCL filter that can operate under both normal and faulty grid conditions. The controller introduces bounded nonlinear dynamics and, by using nonlinear input-to-state stability theory, the current-limiting property of the inverter is analytically proven. The proposed controller can be operated in the set mode to accurately send the desired power to the grid or in the droop mode to take part in the grid regulation, while maintaining the inverter current below a given value at all times. Opposed to the existing current-limiting approaches, the current limitation is achieved without external limiters, additional switches or monitoring devices and the controller remains a continuous-time system guaranteeing system stability. Furthermore, this is achieved independently from grid voltage and frequency variations, maintaining the desired control performance under grid faults as well. Extensive experimental results are presented to verify the droop function of the proposed controller and its current-limiting capability under normal and faulty grid conditions.

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Section: Operation Under Grid Variations and Faultsmentioning

confidence: 99%

mentioning

confidence: 99%

Current-Limiting Droop Control of Grid-Connected Inverters

Zhong

Konstantopoulos

2017

IEEE Trans. Ind. Electron.

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“…These microgrids are defined as electric power systems that: have distributed renewable and thermal energy generation as well as conventional and dispatchable loads. They also have the ability to operate while connected or disconnected from the main power grid [12,40,41,65]. The high penetration of renewable energy resources introduces new dynamics into these microgrids at all timescales [5,17].…”

Section: Introduction: Resilience In Power System Coordination and Controlmentioning

confidence: 99%

“…These include a primary and a secondary control and a tertiary dispatch. Many microgrid control and optimization developments have drawn from this traditional hierarchical approach with customizations to account for the unique features found in microgrids [12,40,41,65]. Generally speaking, each of these layers have typically been addressed individually despite their interdependence.…”

Section: Introduction: Resilience In Power System Coordination and Controlmentioning

confidence: 99%

Multi-Agent System Design Principles for Resilient Coordination & Control of Future Power Systems

Farid

2015

Intell Ind Syst

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Recently, the academic and industrial literature has coalesced around an enhanced vision of the electric power grid that is intelligent, responsive, dynamic, adaptive and flexible. One particularly emphasized "smart-grid" property is that of resilience where healthy regions of the grid continue to operate while disrupted and perturbed regions bring themselves back to normal operation. Multi-agent systems have recently been proposed as a key enabling technology for such a resilient control scheme. While the power system literature has often addressed multi-agent systems, many of these works did not have resilience as the central design intention. This paper now has a two-fold purpose. First, it seeks to identify a set of multi-agent system design principles for resilient coordination and control of future power systems. To that end, it draws upon an axiomatic design for large flexible engineering systems model which was recently used in the development of resilience measures. From this quantitative model, a set of design principles are easily distilled. Second, the paper assesses the adherence of existing multi-agent system implementations with respect to these design principles. The paper concludes that while many multi-agent systems have been developed for power grids, they have been primarily intended as the decentralization of a particular decision-making/control algorithm. Thus many of the works make only limited contributions to power grid resilience.B Amro M. Farid

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“…Power system stability analyses [22]- [28] take into account that a power system is a highly nonlinear system that operates in a constantly changing environment (i.e. loads and generators outputs, when based on RE, change continually).…”

mentioning

confidence: 99%

Hybrid micro-grid experimental application in Tanzania

Carmeli

Mauri

Brivio

et al. 2015

2015 International Conference on Clean Electrical Power (ICCEP)

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Abstract-This paper is intended to introduce the project Energy4Growing that aims at studying and setting up a hybrid micro-grid to supply power to a school in rural Tanzania. It describes the results of the early project actions which concerned in: (i) analysing the actual school power supply system through locally metered data; (ii) developing the first step of a new electro-mechanical model which addresses the simulation of operation and dynamics within an off-grid power system; (iii) validating the new model. In particular the paper focuses on describing the development and the first step implementation of the new modelling approach which address: (i) voltage and frequency analyses over medium term period by means of simplified electromechanical models of power sources and power electronics, (ii) the analysis of different dispatch strategies and their consequence on voltage and frequency trends, (iii) the effects of dispatch strategies on the energy performances of particular components such as battery bank or dump loads. The new approach has also been applied in modelling the current school power supply system.

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Some Aspects of Stability in Microgrids

Cited by 358 publications

References 32 publications

Current-Limiting Droop Control of Grid-Connected Inverters

Current-Limiting Droop Control of Grid-Connected Inverters

Multi-Agent System Design Principles for Resilient Coordination & Control of Future Power Systems

Hybrid micro-grid experimental application in Tanzania

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