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检索条件"主题词=Density estimation robust algorithm"

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Coordination of control and energy management methods for microgrid systems

Coordination of control and energy management methods for mi...

引用

IEEE PES Innovative Smart Grid Technologies Conference Europe (ISGT Europe)

作者： Jordi Pegueroles-Queralt Lucia Igualada-Gonzalez Cristina Corchero-Garcia Miquel Cruz-Zambrano Gerard del-Rosario-Calaf Catalonia Institute for Energy Research IREC Spain

Microgrid is a promising paradigm for the large scale integration of DER in distribution networks. This paper addresses the state of the art in the conception, operation and design of microgrids. It also discusses the impact and contributions to distribution grids of multiple microgrids, coordinated through an aggregator agent. Microgrids may operate as isolated electrical systems in case of contingency in the distribution network; a comprehensive analysis on the energy management system and stabilizing control for such operation mode, as well as for the grid connected mode, is provided. This paper reflects the vision of the Catalonia Institute for Energy Research (IREC) for near future microgrids based on the experience of its laboratory test bed.

关键词： Microgrids Energy management Europe Switches density estimation robust algorithm Frequency control Digital signal processing

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Advanced feed-forward strategy to dynamic control of the islanded micro grids

Advanced feed-forward strategy to dynamic control of the isl...

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International Conference on Electrical Energy Systems (ICEES)

作者： Amin Heydari Hamidreza Koofigar Jafar Soltanizamani Factually of Engineering Islamic Azad University KHomeynishahr branch Department of Electrical Engineering University of Isfahan Isfahan Iran

In this paper, by choosing the islanded structure for DER, the problem of voltage and frequency control in micro grids is discussed. The proposed control scheme has been used as a feed forward compensation strategy to reduce the nonlinear effects and to compensate for the load dynamics. Thus, the mathematical islanded model of DER system has been introduced and then, the voltage and frequency controllers have been designed to achieve fast and stable response and also zero steady state error. The operation of system in different load conditions is checked by Matlab-Simulink software. The simulation results show the robust operation of closed loop system composed with designed controller.

关键词： density estimation robust algorithm Voltage control Frequency control Switches Mathematical model Feeds

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Evaluation method for impact on protection of distribution network with distributed electric resources

Evaluation method for impact on protection of distribution n...

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China International Conference on Electricity Distribution, CICED

作者： Wenlong Zhao Bingyin Xu Liang Zhang PLA - China Smart Grid Research Center SDUT - China

Recent gradual improvement of the distributed electric resources (DER) penetration results in the change of original topology and power flow direction of distributed network. The short circuit current, which is provided by distributed electric resources, has changed the distributed network fault current both in size and distribution, will reduce the protection sensitivity, and bring negative impacts such as blinding and tripping. However, the actual structures of active distribution network are complex, it is difficult to measure the impact levels in traditional methods. These situations must be avoided. In this paper, the worst situations on protection are analyzed, an evaluation method based on maximum value of short circuit current provided by DER is proposed. The simulation with Matlab/Simulink software is introduced, the error sources of the method are analyzed, and the results indicate the feasibility and validity of the proposed method.

关键词： density estimation robust algorithm Software packages Abstracts Force Cogeneration Relays

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Randomization effect on iterative-based speaker diarization system for telephone conversations

Randomization effect on iterative-based speaker diarization ...

引用

IEEE Convention of the Electrical and ELectronic Engineers in Israel

作者： Tal Furmanov Lidiya Aminov Ami Moyal Itshak Lapidot Applied Materials Rehovot Israel Afeka Tel-Aviv Academic College of Engineering ACLP-Afeka Center for Language Processing Tel-Aviv Israel

The primary objective of speaker diarization system is to designate speech segments to one of K speakers in the conversation. We use a hidden-distortion-model (HDM)-based system. HDM allows using different emission models as speaker models. We investigate the effect of randomization in two different levels. One level is stochastic training versus deterministic training and the other, random model initialization versus preserving initialization from the previous iteration. The emission models were codebooks (CBs) trained using K-means algorithm, both, batch and stochastic versions, as well as a self-organizing map (SOM) in its stochastic version. The evaluation performed on 108 telephone conversations from the LDC CallHome corpus. We will show that randomizing is always outperforming the deterministic training. Stochastic training demonstrated relative improvement of 3.5%. Random initialization achieved relative improvement of 7.28% comparing to preservation of initialization from the previous iteration.

关键词： Stochastic processes Training Hidden Markov models Adaptation models Convergence Speech density estimation robust algorithm

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Variational Bayes based I-vector for speaker diarization of telephone conversations

Variational Bayes based I-vector for speaker diarization of ...

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International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： Rong Zheng Ce Zhang Shanshan Zhang Bo Xu Chinese Academy of Sciences Institute of Automation Beijing China

In this paper, we investigate the variational Bayes based I-vector method for speaker diarization of telephone conversations. The motivation of the proposed algorithm is to utilize variational Bayesian framework and exploit potential channel effect of total variability modeling for diarization of conversation side. Other three well-known techniques are compared as follows: K-means clustering for eigenvoices and I-vector speaker diarization, and variational Bayes applied to eigenvoices. Performance evaluations are conducted on the summed-channel telephone data from the 2008 NIST speaker recognition evaluation. The paper discusses how the performance is influenced by different modules, e.g., VAD, initial speaker clustering and Viterbi re-segmentation. Comparison experiments show the interest of variational Bayesian probabilistic framework for speaker diarization.

关键词： Viterbi algorithm Speech Bayes methods density estimation robust algorithm Speech processing Vectors Clustering algorithms

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Multi-Agent-based distributed optimization for Demand-Side-Management applications

Multi-Agent-based distributed optimization for Demand-Side-M...

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Federated Conference on Computer Science and Information Systems (FedCSIS)

作者： Tim Dethlefs Thomas Preisler Wolfgang Renz Faculty of Engineering and Computer Science Hamburg University of Applied Sciences Hamburg Germany

ISBN: (纸本)9781479928538

Dynamic and volatile grid conditions caused by the growing amount of renewable energy producers require the operation of large-scale distributed Demand-Side Management (DSM) applications. This is one of the tasks of the aggregator role in smart grid operation according to the Smart Grid Architecture Model (SGAM). For the optimization of distributed demand-side loads under such conditions, Multi-Agent Systems (MAS) have been shown to provide an appropriate paradigm to model, simulate and deploy automated operating components.

关键词： Optimization Planning Smart grids Runtime Load modeling Vectors density estimation robust algorithm

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Modelling and Simulation for INER AC Microgrid Control

Modelling and Simulation for INER AC Microgrid Control

引用

IEEE Power and Energy Society General Meeting

作者： G. W. Chang G. F. Zeng H. J. Su L. Y. Hsu Y. R. Chang Y. D. Lee C. H. Lin Department of Electrical Engineering National Chung Cheng University Chia-Yi Taiwan R.O.C. Atomic Energy Council Institute of Nuclear Energy Research Taiwan R.O.C.

A microgrid integrates renewable energy and other forms of distributed energy resources (DER) to serve its loads. The microgrid can increase the DER penetration and improve power quality and reliability through appropriate management. Under the normal operation, a microgrid is connected to the utility grid, and each DG provides a preset power to the network through active/reactive power control (PQ control), whereas the utility grid is responsible for supplying/absorbing any power discrepancy. When the microgrid is disconnected from the utility grid, at least one unit switches to droop control from PQ control in order to regulate the voltage and frequency in the microgrid and continue to supply power to local load. This paper adopts Matlab/Simulink to model and simulate an actual ac microgrid with proposed control strategies. Several operation conditions including grid connected mode, islanding mode and load variation are simulated. Results show that the proposed control strategies for the microgrid are effective.

关键词： Microgrids density estimation robust algorithm Voltage control Synchronization Inverters Frequency control Educational institutions

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Planned communities as microgrid applications

Planned communities as microgrid applications

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IEEE PES Innovative Smart Grid Technologies Conference Europe (ISGT Europe)

作者： Panayiotis Moutis Spyros Skarvelis-Kazakos Maria Brucoli Joel Hung Shu-Wei Wu Faculty of Engineering and Science University of Greenwich Medway United Kingdom Arup 13 Fitzroy Street London United Kingdom

ISBN: (纸本)9781479977215

The microgrid (MG), as an operational paradigm for the exploitation of distributed energy resources (DER), has been thoroughly studied the past few years. However, applications are largely limited to test sites and demo installations, lacking the business argument in favor of the wider deployment of the MG concept. Planned communities (PC), a residential development concept aiming to channel the population growth away from the overcrowded and polluted city centers, can serve as a business model for the application of the MG control architectures and philosophies. This paper intends to link the core characteristics of the PC to existing MG sites and installations, providing evidence of their suitability for MG development.

关键词： density estimation robust algorithm Communities Cities and towns Reliability Voltage control Microgrids Power system reliability

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Modified Particle Swarm Optimization applied to integrated demand response and DG resources scheduling

Modified Particle Swarm Optimization applied to integrated d...

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IEEE PES Transmission and Distribution Conference and Exposition

作者： Pedro Faria Joao Soares Zita Vale Hugo Morais Tiago Sousa School of Engineering Polytechnic of Porto

The elastic behavior of the demand consumption jointly used with other available resources such as distributed generation (DG) can play a crucial role for the success of smart grids. The intensive use of Distributed Energy Resources (DER) and the technical and contractual constraints result in large-scale non linear optimization problems that require computational intelligence methods to be solved. This paper proposes a Particle Swarm Optimization (PSO) based methodology to support the minimization of the operation costs of a virtual power player that manages the resources in a distribution network and the network itself. Resources include the DER available in the considered time period and the energy that can be bought from external energy suppliers. Network constraints are considered. The proposed approach uses Gaussian mutation of the strategic parameters and contextual self-parameterization of the maximum and minimum particle velocities. The case study considers a real 937 bus distribution network, with 20310 consumers and 548 distributed generators. The obtained solutions are compared with a deterministic approach and with PSO without mutation and Evolutionary PSO, both using self-parameterization.

关键词： Particle swarm optimization density estimation robust algorithm Load management Educational institutions Distributed power generation Smart grids Energy resources

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Microgrids and the future of the European city

Microgrids and the future of the European city

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Saudi Arabia Smart Grid Conference (SASG)

作者： Laurent Schmitt Said Kayal Jayant Kumar ALSTOM Grid France ALSTOM Grid USA

Smart grids are fundamental to transform today's electricity grids to address growing demand, renewable intermittent and distributed generation, and environmental pressures. Microgrids are an integral part of the transformation. But, as in all transformations, there are challenges as well as opportunities. The purpose of this paper is to present several European microgrids, focusing on their relative roles with respect to each other and to the overall energy eco-system. We hope this will provide insights into how microgrids may evolve in the years to come.

关键词： Microgrids Cities and towns Europe Smart grids density estimation robust algorithm Energy resources Economics

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