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

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Reduction of power fluctuation in grid connected SPV plant through aggregate distributed generation

Reduction of power fluctuation in grid connected SPV plant t...

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IEEE Power India Conference

作者： Majid Jamil Ahmed Sharique Anees Mona Subramaniam Naqui Anwer Department of Electrical Engineering Jamia Millia Islamia New Delhi India Department of Electrical and Electronics Engineering Galgotias College of Engineering and Technology Greater Noida India

ISBN: (纸本)9781479960439

This paper aims to analyze the reduction of power fluctuation in the main grid by the generation of distributed solar power through several small micro grids connected into main grid. These fluctuations are mainly due to seasonal condition and cloud passing over the solar plant. There are several methods available to predict the power fluctuation due to seasonal variation but fluctuation due to cloud passing is very unpredictable. In this paper, a novel method is proposed where the power generated from SPV using several small micro grids which are geographically distributed in a 100 km radius are integrated. All of the five stations which are generating x amount of power individually are connected to the main grid at a common point, the collective fluctuation is monitored and compared for each of the sites against a system generating 5x power at a single location. It is found that the geographically distributed generation (neglecting transmission losses) produces less fluctuation in the grid. The proposed system gives less fluctuation because it is unlikely that all the sites have cloud cover at a particular time simultaneously. The advantage of the proposed system is that a lesser capacity battery bank will be required and the excess power generated during clear weather will be injected into the grid which will generate extra income. This is aptly suitable for the Indian power sector where grid is always operating at lower frequency.

关键词： Fluctuations Aggregates Distributed power generation Meteorology Clouds density estimation robust algorithm

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Enabling the participation of domestic consumer based VPPs in DR programs using near real time control over LTE networks

Enabling the participation of domestic consumer based VPPs i...

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International Conference on Industrial and Information Systems, ICIIS

作者： M. A. M. Manaz K. M. Liyanage J. B. Ekanayake Department of Electronic and Computer Engineering Sri Lanka Institute of Information Technology (SLIIT) Malabe Sri Lanka Department of Electrical and Electronic Engineering University of Peradeniya Peradeniya Sri Lanka

Smart Grid is expected to improve the reliability and efficiency while reducing the carbon footprint of energy sector. The incorporation of renewable generations at customer premises is a viable method to increase the renewable component of generation in Smart Grid. However, the random and intermittent nature of power generation is an inherent challenge for the operation of power grids with high penetration of renewable generation. Coordinating the operation of Distributed Energy Resources (DER) that includes controllable loads and storage too to achieve Virtual Power Plant (VPP) functionality has yielded amicable results in mitigating these fluctuations. This, in turn, could enable effective market participation by domestic consumers through an aggregator who can estimate the day's renewable generation pattern and coordinate the operation of DER to meet utility's Demand Response (DR) needs effectively. Such operation requires the exchange of significant volume of information between aggregator and consumers. By utilizing public data networks to exchange control and system information, the cost of implementing such operation could be reduced significantly. This paper reports the results of a co-simulation study that analyzed the feasibility of implementing VPP functionality through a coordinated control scheme implemented using a LTE network Successful such implementations enable an aggregator to participate in a DR program that demands the control of active power flow in the distribution feeder. The simulation platform developed for this study comprises a real-time power system simulation set-up and a commercial LTE based communication network.

关键词： Real-time systems Cogeneration Fluctuations Renewable energy sources density estimation robust algorithm Load flow IP networks

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Distribution system voltage regulation by distributed energy resources

Distribution system voltage regulation by distributed energy...

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Annual North-American Power Symposium

作者： Oğuzhan Ceylan Guodong Liu Yan Xu Kevin Tomsovic Department of Electrical Engineering and Computer Science The University of Tennessee (UT) Knoxville TN USA Oak Ridge National Laboratory (ORNL) Oak Ridge TN USA

This paper proposes a control method to regulate voltages in 3 phase unbalanced electrical distribution systems. A constrained optimization problem to minimize voltage deviations and maximize distributed energy resource (DER) active power output is solved by harmony search algorithm. IEEE 13 Bus Distribution Test System was modified to test three different cases: a) only voltage regulator controlled system b) only DER controlled system and c) both voltage regulator and DER controlled system. The simulation results show that systems with both voltage regulators and DER control provide better voltage profile.

关键词： density estimation robust algorithm Voltage control Reactive power Inverters Regulators Optimization Linear programming

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Nonlinear PID and feedforward control of robotic manipulators

Nonlinear PID and feedforward control of robotic manipulator...

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International Conference on Sciences and Techniques of Automatic Control and Computer Engineering (STA)

作者： Fatma Abdelhedi Yassine Bouteraa Ahmed Chemori Nabil Derbel BPW Sfax Engineering School Sfax Tunisia

The purpose of this paper is to design a nonlinear PID controller for trajectory tracking of a manipulator robot. The objective is to develop a PID controller having high performances for the controllability and the stability of the manipulator. Moreover, the controller should be easy to implement. In a first step a PID plus a feedforward controller has been developed and implemented on a SCARA robot. In the second step and in order to increase performances of the developed control law, an improving version has been developed by adopting nonlinear gains. Simulation results show the effectiveness of the control law in particular in the presence of variable gains.

关键词： Manipulators density estimation robust algorithm Feedforward neural networks Torque

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Autonomous and adaptive voltage control using multiple distributed energy resources

Autonomous and adaptive voltage control using multiple distr...

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IEEE General Meeting Power& Energy Society

作者： Huijuan Li Fangxing Li Yan Xu D. Tom Rizy Sarina Adhikari University of Tennessee Knoxville Knoxville TN US EECS The University of Tennessee

Summary form only given. This paper proposes a plug-and-play control method to coordinate multiple distributed energy resources (DER or DE) to regulate voltages in future distribution systems with a high DE penetration. Theoretical analysis shows that there exists a corresponding formulation of the dynamic control parameters with multiple DEs to give the desired responses. Therefore, the proposed control method has a solid theoretical basis. The method is based on dynamically and adaptively adjusting DE control parameters to ensure that actual voltage responses follow the desired outputs. Also, it is based on local and the other DEs' voltages without the need of the full system data and extensive studies to tune the control parameters. Hence, the method is autonomous and adaptive for variable operational situations, and has the plug-and-play feature with a high tolerance to unavailable or inaccurate system data. Thus, it is suitable for broad utility application. Simulation results from various conditions, such as asynchronous start of multiple DEs, disappearance of the original disturbance in the middle of the control process, and operation in looped distribution systems, confirm the performance, validity, and flexibility of the proposed control method. The possible impact of communication latency on the performance of the proposed method is also discussed.

关键词： Voltage control Adaptive systems Energy resources Educational institutions density estimation robust algorithm Solids Simulation

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Microwave FM / AM signal separator: Design and analysis

Microwave FM / AM signal separator: Design and analysis

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

作者： Taraprasad Chattopadhyay Prosenjit Bhattacharyya Department of Physics Visva-Bharati University Santiniketan West Bengal India

In this paper, the authors have proposed, analyzed and demonstrated a microwave FM-AM signal separator circuit at X-band of the microwave spectrum. This circuit has a flat region in its frequency response which does not respond to any frequency variation of the input signal. So, it suppresses the FM part of the input FM-AM signal and delivers the AM only at its output. The resulting AM can be detected by using a microwave diode detector followed by a low pass filter. The novelty of the design is that it requires no down conversion of the input microwave signal.

关键词： Frequency modulation Oscilloscopes density estimation robust algorithm Nickel Particle separators

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Steady-state modeling and simulation of a distribution feeder with distributed energy resources in a real-time digital simulation environment

Steady-state modeling and simulation of a distribution feede...

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Annual North-American Power Symposium

作者： Mayank Panwar Siddharth Suryanarayanan Sudipta Chakraborty Colorado State University Fort Collins CO 80523 USA National Renewable Energy Laboratory Golden CO 80401 USA

This paper presents modeling procedures and validated results for the IEEE-13 node test distribution feeder using the real-time digital simulation platform RTDS-RSCAD. Models for distribution feeders in this real-time platform are rare, and this paper provides a detailed approach for developing this type of model. The platform-specific models, challenges, assumptions, solutions, and steady-state validation are presented. The feeder model developed here is aimed to be extended to an electric microgrid with integrated distributed energy resources (DER), which can be used to perform microgrid dispatch simulations. As demand curve information is important for microgrid dispatch simulations and is not available for the test feeder, a method for demand curve synthesis is presented. In addition, a method for DER sizing and placement is presented for design of a potential microgrid.

关键词： Load modeling Voltage control density estimation robust algorithm Microgrids Regulators Load management Steady-state

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Modeling, Analysis and Evaluation of Smart Load Functionality in the CERTS Microgrid

Modeling, Analysis and Evaluation of Smart Load Functionalit...

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IEEE Energy Conversion Congress and Exposition

作者： Abrez Mondal David A. Klapp Mahesh S. Illindala Joseph H. Eto The Ohio State University Columbus OH USA American Electric Power Groveport OH USA Lawrence Berkeley National Lab Berkeley CA USA

ISBN: (纸本)9781479957774

The objective of this work is primarily aimed at investigating the behavior of the CERTS Microgrid test bed with the integration of smart loads. The smart loads are primarily employed to relieve the system frequency as soon as it begins to deteriorate. The installed smart load assembly is modeled in this paper and its performance with the different distributed energy resources (DERs) in the existing CERTS Microgrid test bed is analyzed. This paper also evaluates the benefits of using these smart loads as a means to prevent the DERs from stalling in the islanded mode of operation.

关键词： Microgrids Load modeling Assembly density estimation robust algorithm Time-frequency analysis Trajectory Generators

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Fault clearing in a converter-dominated microgrid with traditional protection means

Fault clearing in a converter-dominated microgrid with tradi...

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IEEE International Symposium on Power Electronics for Distributed Generation Systems (PEDG)

作者： Konstantinos O. Oureilidis Spyros I. Gkavanoudis Charis S. Demoulias Department of Electrical & Computer Engineering Aristotle University of Thessaloniki (AUTH) Thessaloniki Greece

The increased penetration of converter-interfaced distributed generation in microgrids has emerged the serious problem of protection during faults, due to the lack of large current injection. This paper proposes a fault detection and clearing control method for three-phase symmetrical faults in a microgrid with looped topology. The fault detection method is based on measuring the microgrid impedance variation during the fault, through the injection of a slightly distorted current. When the fault is identified, the distributed energy sources (DERs) switch their control strategy from droop control to current source mode, in order to inject a current proportional to the measured microgrid impedance. In this way, the DER closer to the fault injects a relatively larger current. The fault clearing process is carried out with simple overcurrent relays, which have the same settings. The coordination of the protection means is implemented from the discrete current injection of the DERs. Furthermore, in order to ensure the current injection even in the case of lack of power from the primary renewable source, a supercapacitor energy storage system (SESS) is added on the DC-link. A significant contribution is the voltage recovery after the fault clearance with a seamless transient effect. The effectiveness of the proposed control strategy is evaluated through simulation tests, conducted in PSIM software environment.

关键词： Microgrids Impedance Relays density estimation robust algorithm Circuit faults Current measurement Impedance measurement

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Grid-connected PV inverter test system for solar photovoltaic power system certification

Grid-connected PV inverter test system for solar photovoltai...

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IEEE General Meeting Power& Energy Society

作者： Yu-Jen Liu Pei-Hsiu Lan Hong-Hsun Lin Renewable Energy Laboratory Taiwan Electric Research and Testing Center Taoyuan Taiwan (R.O.C.)

Photovoltaic inverter, that is in charge of electric power conversion, is a critical component used in solar photovoltaic power systems. Many concerns are focused on the operation of photovoltaic inverter due to the worse designing may cause the terrible influences on safety, performance and grid interconnection characteristics of solar photovoltaic power systems. IEEE SCC21 provides a uniform standard, known as IEEE 1547 standard, for interconnection considerations of distributed resources with electric power systems. The standard focuses on the technical specifications and includes general principles, response to abnormal conditions, power quality, islanding, and test instructions and requirements for design, production, installation evaluation, commissioning, and periodic tests. This paper presents a interconnection test system for grid-connected photovoltaic inverter based on such standard. Some of the test items that described in IEEE 1547.1 standard are carried out by the proposed system to verify the overall performance. The system is now introduced into the equipment certification of solar photovoltaic power system in Taiwan; therefore, the description of photovoltaic inverter voluntary product certification system in Taiwan may also be presented in the study.

关键词： Standards Inverters density estimation robust algorithm Photovoltaic systems Testing Certification Harmonic analysis

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