Results 1 - 10 of 140

Breaking the Hierarchy: Distributed Control & Economic Optimality in Microgrids

by John W. Simpson-porco, Francesco Bullo
"... Abstract—Modeled after the hierarchical control architecture of power transmission systems, a layering of primary, secondary, and tertiary control has become the standard operation paradigm for microgrids. Despite this superficial similarity, the control objectives in microgrids across these three l ..."
Abstract - Cited by 14 (1 self) - Add to MetaCart
-unexpected connections and dependencies among them. Building from a first-principle analysis of decentralized primary droop control, we study centralized, decentralized, and distributed architectures for secondary frequency regulation. We find that averaging-based distributed controllers using commu-nication among

Decentralization

by S. Chandrasekhar
"... Public projects in water and sanitation sector in India are partially funded by government with users also contributing cash and labor. We estimate a multinomial logit model to analyze the intended form of contribution by households to a public project, using NSSO, India dataset, covering 76,000 rur ..."
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,000 rural and 30,000 urban households. After controlling for existing access to water and sanitation, we find that primary occupation of the household, ownership of assets explain the form of contribution. Worsening of the state of environment, participation in existing programs increases likelihood

Synchronization and Power Sharing for Droop-Controlled Inverters in Islanded Microgrids

by John W. Simpson-Porco, Florian Dörfler, Francesco Bullo , 2013
"... Motivated by the recent and growing interest in smart grid technology, we study the operation of DC/AC inverters in an inductive microgrid. We show that a network of loads and DC/AC inverters equipped with power-frequency droop controllers can be cast as a Kuramoto model of phase-coupled oscillators ..."
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, which dynamically regulates the system frequency in the presence of a time-varying load. Remarkably, this distributed-averaging integral controller has the additional property that it preserves the power sharing properties of the primary droop controller. Our results hold without assumptions

Stability, Power Sharing, & Distributed Secondary Control in Droop-Controlled Microgrids

by John W. Simpson-porco, Francesco Bullo, Qobad Shafiee, Josep M. Guerrero
"... Abstract—Motivated by the recent and growing interest in microgrids, we study the operation of droop-controlled DC/AC inverters in an islanded microgrid. We present a necessary and sufficient condition for the existence of a synchronized steady state that is unique and locally exponentially stable. ..."
Abstract - Cited by 3 (0 self) - Add to MetaCart
the system frequency in the presence of a time-varying load. Remarkably, this distributed-averaging integral controller has the additional property that it maintains the power sharing properties of the primary droop controller. Finally, we present experimental results validating our controller design, along

Performance Analysis of Voltage Droop Control of DC Micro-Grid

by Fenil V Gadhethariya
"... Abstract — The work presents a performance study of a dc micro-grid when it is used a voltage droop technique to regulated the grid voltage and to control the load sharing between different sources like Photovoltaic cell, Fuel Cell, DG Set, Batteries, etc. A small model of a dc micro-grid comprising ..."
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-grid comprising micro-sources and loads was implemented in the Matlab environment. Some aspects about centralized (master-slave) and decentralized (voltage droop) control strategies as well as the procedures to design the controllers, with droop control, are presented and discussed. Index Terms—dc-dc converter

Optimal Decentralized Primary Frequency Control in Power Networks

by Changhong Zhao, Steven Low
"... Abstract — We augment existing generator-side primary fre-quency control with load-side control that are local, ubiquitous, and continuous. The mechanisms on both the generator and the load sides are decentralized in that their control decisions are functions of locally measurable frequency deviatio ..."
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Abstract — We augment existing generator-side primary fre-quency control with load-side control that are local, ubiquitous, and continuous. The mechanisms on both the generator and the load sides are decentralized in that their control decisions are functions of locally measurable frequency

Dynamical Decentralized Voltage Control of MTDC Grids

by Martin Andreasson, Na Li
"... Abstract—High-voltage direct current (HVDC) is a com-monly used technology for long-distance electric power trans-mission, mainly due to its low resistive losses. When connecting multiple HVDC lines into a multi-terminal HVDC (MTDC) system, several challenges arise. To ensure safe and efficient oper ..."
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operation of MTDC systems, the voltage of all terminals need to be steered to within an operational range. In this paper we study the commonly used decentralized voltage droop controller, and show that it in general does not steer the voltages to within the operational range. We propose a decentralized PI

1 Stability Enhancement of Decentralized Inverter Control through Wireless Communications

by In Microgrids, Hao Liang, Student Member, Bong Jun Choi, Weihua Zhuang, Xuemin (sherman Shen
"... Abstract—Decentralized inverter control is essential in distributed generation (DG) microgrids for low deployment/operation cost and high reliability. However, decentralized inverter control suffers from a limited system stability mainly because of the lack of communications among different inverter ..."
Abstract - Cited by 8 (5 self) - Add to MetaCart
inverters. In this paper, we investigate stability enhancement of the droop based decentralized inverter control in microgrids. Specifically, we propose a power sharing based control strategy which incorporates the information of the total real and reactive power generation of all DG units. The information

Decentralized Cognitive Radio Control based on Inference from Primary Link Control Information 1

by Senhua Huang, Xin Liu, Zhi Ding
"... This work on cognitive radio access ventures beyond the more traditional “listen-before-talk ” paradigm that underlies many cognitive radio access proposals. We exploit the bi-directional interaction of most primary communication links. By intelligently controlling their access parameters based on t ..."
Abstract - Cited by 16 (0 self) - Add to MetaCart
This work on cognitive radio access ventures beyond the more traditional “listen-before-talk ” paradigm that underlies many cognitive radio access proposals. We exploit the bi-directional interaction of most primary communication links. By intelligently controlling their access parameters based

DC Voltage Control and Power-Sharing of Multi-Terminal DC Grids Based on Optimal DC Power Flow and Voltage Droop Strategy

by F. Azma, H. Rajabi Mashhadi*(c. A
"... Abstract: This paper develops an effective control framework for DC voltage control and power-sharing of Multi-Terminal DC (MTDC) grids based on an Optimal Power Flow (OPF) procedure and the voltage-droop control. In the proposed approach, an OPF algorithm is executed at the secondary level to find ..."
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Abstract: This paper develops an effective control framework for DC voltage control and power-sharing of Multi-Terminal DC (MTDC) grids based on an Optimal Power Flow (OPF) procedure and the voltage-droop control. In the proposed approach, an OPF algorithm is executed at the secondary level to find
Results 1 - 10 of 140