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Impact of penetration of non-synchronous generators on power system dynamics

Impact of penetration of non-synchronous generators on power...

引用

Power Tech Conference

作者： Panagiotis N. Papadopoulos Jovica V. Milanović School of Electrical and Electronic Engineering The University of Manchester Manchester UK

Due to the integration of Distributed Energy Resources (DERs), both non-synchronous generators and energy storage technologies, the dynamic behavior of power systems is changing. The extent of the impact is yet to be fully investigated and quantified. Proper models, suitable for large scale studies but also representing all the DER control and protection mechanisms that affect the dynamic behavior of individual components and the system as a whole are used in this study. The effect of DER location, penetration level and decommissioning of conventional generators is studied. A Monte Carlo approach is used to account for uncertainties resulting from different fault location, duration and loading of the system. The focus of the paper is to illustrate the effect of DERs on power system stability and dynamic signature.

关键词： Generators density estimation robust algorithm Power system stability Rotors Power system dynamics Stability criteria

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A novel approach for QRS delineation in ECG signal based on chirplet transform

A novel approach for QRS delineation in ECG signal based on ...

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IEEE International Conference on Electronics, Computing and Communication Technologies (CONECCT)

作者： Basheeruddin Shah Shaik G V S S K R Naganjaneyulu A.V. Narasimhadhan Computational Engineering Rajiv Gandhi University of Knowledge Technologies Nuzvid India

ECG analysis is used significantly in diagnosis, and biometrics. QRS complex detection is an important step in any application involving ECG signal. In this work, a novel approach for QRS complex detection based on chirplet transform is proposed. The QRS detection algorithm proposed in this work mainly consists of four steps. A preprocessing step to remove power line interference, computation of chirplet transform, an adaptive threshold technique for detecting possible QRS complex peaks, and followed by a decision making step. The performance of proposed algorithm for QRS complex detection is evaluated on MIT-BIH database and compared with the results of different algorithms in the state of art. The performance of the algorithm is comparable with the state of art of QRS complex detection.

关键词： Chirp Transforms Time-frequency analysis Electrocardiography Databases algorithm design and analysis density estimation robust algorithm

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Research on the typical systems for active distribution network in China

Research on the typical systems for active distribution netw...

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International Symposium on Smart Electric Distribution Systems and Technologies (EDST)

作者： Hui Hui Mingtian Fan Zuping Zhang China Electric Power Research Institute Beijing China

In order to host a large scale of distributed energy resources (DER) connected to the distribution network, China is developing active distribution network (ADN) which is proposed by CIGRE C6.11. To enhance the development of ADN in China, the paper proposes the ADN typical systems, which focus on resolving the problems of DER integration. Establishing a common basis for testing DER integration technologies is a significant challenge because DER is too diverse and has some uncertain impacts on the distribution network. The typical systems facilitate the analysis and validation of DER integration. Firstly, the paper analyzes the construction method of the typical systems. Secondly, based on the distribution network characteristics in China, the paper proposes the ADN typical systems, and each system includes typical network structure and load information of each node. Finally, to evaluate the application of the typical systems, the paper designs a simulation model, which is a set of different voltage levels, different loads, and different DER (wind farm, photovoltaic, battery), and the simulation results prove that the typical systems could be a common basis for researching the ADN development in China.

关键词： density estimation robust algorithm Conductors Wind farms Batteries Standards Network topology Loading

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A control strategy for an island operated LV microgrid under unbalanced faults

A control strategy for an island operated LV microgrid under...

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International Future Energy Electronics Conference (IFEEC)

作者： Jinghan He Jun Hu Xiaojun Wang School of Electrical Engineering Beijing Jiaotong University Beijing China

ISBN: (纸本)9781479976584

This paper proposes an control strategy for the voltage control of an inner current-controlled distributed energy resource units (DERs) in an islanded microgrid to provide overcurrent protection under unbalanced faults. During the unbalanced voltage sag, even though the inner current-controlled limit the current magnitude, the peak phase current may still exceed the limit value. The control strategy scheme detects the fault, limits the phase current magnitude of the DER unit through changing the reference voltage, and restores the microgrid to its normal operating condition subsequent to fault clearance. Digital time-domain simulation studies, in the DIgSILENT/Power-Factory software environment, have demonstrated the feasibility and desirable performance of the proposed strategy.

关键词： Voltage control Voltage fluctuations Microgrids density estimation robust algorithm Inverters Limiting Phase locked loops

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Performance of turbo coded Space-Time transmit diversity aided IDMA system

Performance of turbo coded Space-Time transmit diversity aid...

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International Conference on Communications and Signal Processing

作者： K.S. Vishvaksenan D. Abidha Electronics and Communication Engineering Department SSN College of Engineering Chennai India SSN College of Engineering Chennai India

In this letter, we investigate the bit error rate performance of turbo coded Multiple-input Multiple-output (MIMO) assisted-interleave division multiple access (IDMA) system over correlated frequency-selective channels for down-link (DL) communications. In this contribution, we realize MIMO profile using Alamouti Space-Time transmit diversity (STTD) which offers full rate and full diversity. We implement such STTD architecture by utilizing two transmit antennas at the base station(BS)and two receive antennas at each mobile station(MS).We consider parallel concatenated convolutional encoder as a channel encoder at the transmitter side. We employ Maximum Likelihood (ML) detection algorithm based on non-linear multi-user detection to estimate the desired users' signals at the MS. Further, we exploit the iterative decoding technique based on maximum log-MAP decoding algorithm to achieve necessary coding gain. Our simulation results reveals that our considered coded STTD-IDMA system with ML detection algorithm provides better bit error performance with less signal to noise ratio for DL communications.

关键词： Erbium MIMO density estimation robust algorithm Binary phase shift keying Turbo codes Frequency modulation Market research

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Vertical Reactive Power Flexibility based on Different Reactive Power Characteristics for Distributed Energy Resources

Vertical Reactive Power Flexibility based on Different React...

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International ETG Congress 2015;Die Energiewende - Blueprints for the new energy age

作者： Ignacio Talavera Sebastian Stepanescu Florian Bennewitz Jutta Hanson Richard Huber Fred Oechsle Hans Abele Technische Universitat Darmstadt Netze BW GmbH Transnet BW GmbH

The potential to vary reactive power exchange between MV- and HV-networks using different reactive power charac-teristics for MV-connected Distributed Energy Resources (DER) is analysed in this paper. The main goal is to analyse if the properties of Vertical Reactive Power Flexibility (VRPF) are adequate for a reactive power management exclusively based on DER. Special attention is paid to the assessment of the reactive power flexibil-ity for a wide range of load and feed-in scenarios. Moreover, other aspects like network constraints and power losses are analysed and compared for the different reactive power characteristics. The purpose is to evaluate to which extent volt-age and thermal constraints of networks would limit the possible reactive power flexibility achieved by the three de-fined characteristics and the influence of reactive power flexibility on power losses. For the analysis, power system simulations are carried out using a detailed network model of eight rural 20-kV-networks with a high penetration of DER. These networks are real MV-networks located in Southern Germany. In addi-tion to MV-connected DER, the proposed concept for vertical reactive power flexibility uses the controllability of tap changers based on a coordinated Wide Area Voltage Control of the HV/MV-transformers. Based on the simulation results, a method is proposed that copes with the limitations of each of the analysed reactive power characteristics. As explained in the paper, the weighted use of two reactive power characteristics for DER is a good compromise in order to obtain a reliable, energy-efficient and cost-effective vertical VRPF.

关键词： Reactive power power performance distributed energy resources density estimation robust algorithm load range power loss Multiple Virtual Storage power markets Energy sources Flexibility Tap changers

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Smart grid cybersecurity risk assessment

Smart grid cybersecurity risk assessment

引用

International Symposium on Smart Electric Distribution Systems and Technologies (EDST)

作者： Lucie Langer Paul Smith Martin Hutle AIT Austrian Institute of Technology Vienna Austria Fraunhofer AISEC Garching Germany

As much as possible, it is important that the smart grid is secure from cyber-attacks. A vital part of ensuring the security of smart grids is to perform a cybersecurity risk assessment that methodically examines the impact and likelihood of cyber-attacks. Based on the outcomes of a risk assessment, security requirements and controls can be determined that inform architectural choices and address the identified risks. Numerous high-level risk assessment methods and frameworks are applicable in this context. A method that was developed specifically for smart grids is the Smart Grid Information Security (SGIS) toolbox, which we applied to a voltage control and power flow optimization smart grid use case. The outcomes of the assessment indicate that physical consequences could occur because of cyber-attacks to information assets. Additionally, we provide reflections on our experiences with the SGIS toolbox, in order to support others in the community when implementing their own risk assessment for the smart grid.

关键词： Voltage measurement Smart grids Voltage control Risk management Security Reactive power density estimation robust algorithm

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An adaptive overcurrent protection in smart distribution grid

An adaptive overcurrent protection in smart distribution gri...

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Power Tech Conference

作者： Bishnu P. Bhattarai Birgitte Bak-Jensen Sanjay Chaudhary Jayakrishnan R. Pillai Department of Energy Technology Aalborg University Aalborg Denmark

High penetration of distributed energy resources (DERs) creates various protection challenges, such as protection blinding, false tripping, unsynchronized reclosing, etc. Additionally, adaptation of active network management approaches namely demand response and network reconfiguration also threats existing protection practice. In this study, a combination of a local adaptive and communication assisted central protection is proposed, whereby the relay settings are dynamically updated based on online identification of the network topologies and status of DERs. Particularly, the local adaptive protection updates relay settings based on DERs status (ON/OFF) employing locally acquired information, whereas the centralized protection updates the relay settings during major changes in grid topologies: network reconfiguration and switching between islanded and grid-connected modes. The effectiveness of the proposed algorithm is demonstrated through simulation results performed on a medium voltage (10 kV) distribution network using real time digital simulation (RTDS). Simulation results demonstrates that the proposed algorithm provides good discrimination and selectivity of faults during varied network conditions.

关键词： Relays density estimation robust algorithm Fault currents Network topology Switches Circuit faults Load modeling

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A socially aware incentive strategy for encouraging residential solar uptake in Brunei

A socially aware incentive strategy for encouraging resident...

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IEEE International Conference on Smart Grid Communications (SmartGridComm)

作者： Harshad Khadilkar Pratyush Kumar Subendhu Rongali Sampath Dechu Mohammad Iskandarbin Pg Hj Petra IBM Research Bangalore Universiti Brunei Darussalam Universiti Brunei Darussalam

This paper proposes an economic incentive strategy for encouraging the installation of solar photovoltaic cells amongst residential consumers in Brunei. Prior literature analyses several options in different geographical contexts, all of which focus on subsidising the effective prorated cost of energy from solar resources. It has also been noted that social effects such as the influence of neighbours and economic status can have a significant effect on the spatio-temporal rate of solar uptake. In this work, we estimate the impact of these factors using a model trained on an empirical data set. Subsequently, we develop a versatile policy architecture for the country of Brunei, based on (i) geographical location within the country, (ii) sociological meta data of residents, and (iii) the economic characteristics and drivers that are unique to Brunei. These characteristics, which include an abundance of fossil fuel reserves, subsidised energy costs, and the need to balance economic and social objectives, impart intriguing properties to the incentive structure.

关键词： Economics Incentive schemes density estimation robust algorithm Data models Government Conferences Smart grids

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ICT reliability modelling in co-simulation of smart distribution networks

ICT reliability modelling in co-simulation of smart distribu...

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IEEE International Forum on Research and Technologies for Society and Industry Leveraging a better tomorrow (RTSI)

作者： Michele Garau Gianni Celli Emilio Ghiani Gian Giuseppe Soma Fabrizio Pilo Sergio Corti Department of Electrical and Electronic Engineering University of Cagliari Italy S. Corti is with Ricerca Sistema Elettrico - RSE S.p.A. Italy

The evolution towards smart distribution grids requires distributed intelligence and sophisticated information and communication technology (ICT) with distributed intelligent devices to be spread along the power system. ICT devices will be not a simple add-on of the electrical system, but their availability and efficiency will be essential to the operation of the entire power distribution system as support of network management and protection. The paper is focused on modeling of ICT devices in a co-simulation platform for smart distribution networks, which permits an integrated study of the power distribution network and the ICT network. The co-simulation platform developed allows highlighting the level of detail necessary in ICT modelling to assess the efficiency of the control algorithms, the effects of the loss of control signals, and the consistence of simulation to reality in future smart distribution network.

关键词： Reliability Energy management Monte Carlo methods Smart grids density estimation robust algorithm MATLAB

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