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New control and automation system for an islanded microgrid with energy storage systems

New control and automation system for an islanded microgrid ...

引用

IEEE PES Conference on Innovative Smart Grid Technologies - Middle East (ISGT Middle East)

作者： M. R. D. Zadeh A. Hajimiragha M. Adamiak A. Palizban S. Allan GE Digital Energy Markham Ontario Canada Powertech Labs Vancouver Canada

An advanced control system is required to efficiently monitor and optimally operate a microgrid with Distributed Energy Resources (DERs) and storage devices. This control system should provide several functions to be able to reliably and optimally manage the microgrid. A general architecture is proposed comprising of the local and supervisory controllers, automation and communication system, enhanced Human Machine Interface (HMI) and forecasting server. The role of each element of control system is described. The potential integration of the microgrid protection and control systems is discussed. Implementation and performance to date of a control system into a remote isolated grid is presented.

关键词： Control systems density estimation robust algorithm Generators Automation Communication networks Monitoring Pulse width modulation

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The Use of Electrical Thermal Storage to Balance the Variability and Intermittency of Renewable Energy

The Use of Electrical Thermal Storage to Balance the Variabi...

引用

2011 46th International Universities' Power Engineering Conference (UPEC)

作者： Rachael Louise Storry Graham Ault Stuart Galloway

As renewable energy power output is variable and intermittent, an effective means of storing energy while it is abundant is essential for facilitating an increase in renewable generation and a low carbon future. One approach is to incorporate Electrical Thermal Storage (ETS) into the distribution network at the residential level as a responsive demand. This paper proposes a methodology for determining the optimal integration of ETS devices into the distribution network and uses a multiple objective, evolutionary algorithm approach for the optimisation of the size and location of the devices.

关键词： density estimation robust algorithm Optimization Renewable energy resources Educational institutions Electricity Planning Energy storage

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Smart microgrids and virtual power plants in a hierarchical control structure

Smart microgrids and virtual power plants in a hierarchical ...

引用

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

作者： T. L. Vandoorn B. Zwaenepoel J. D. M. De Kooning B. Meersman L. Vandevelde Energy Laboratory (EELAB) Department of Electrical Energy Systems and Automation (EESA) Ghent university Ghent Belgium Power-Link Ghent University Oostende Belgium

In order to achieve a coordinated integration of distributed energy resources in the electrical network, an aggregation of these resources is required. Microgrids and virtual power plants (VPPs) address this issue. Opposed to VPPs, microgrids have the functionality of islanding, for which specific control strategies have been developed. These control strategies are classified under the primary control strategies. Microgrid secondary control deals with other aspects such as resource allocation, economic optimization and voltage profile improvements. When focussing on the control-aspects of DER, VPP coordination is similar with the microgrid secondary control strategy, and thus, operates at a slower time frame as compared to the primary control and can take full advantage of the available communication provided by the overlaying smart grid. Therefore, the feasibility of the microgrid secondary control for application in VPPs is discussed in this paper. A hierarchical control structure is presented in which, firstly, smart microgrids deal with local issues in a primary and secondary control. Secondly, these microgrids are aggregated in a VPP that enables the tertiary control, forming the link with the electricity markets and dealing with issues on a larger scale.

关键词： density estimation robust algorithm Smart grids Voltage control Power generation Renewable energy resources Generators Load management

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A centralized control architecture for harmonic voltage suppression in islanded microgrids

A centralized control architecture for harmonic voltage supp...

引用

Annual Conference of Industrial Electronics Society

作者： Xiongfei Wang Frede Blaabjerg Zhe Chen Josep M. Guerrero Department of Energy Technology Aalborg University Denmark

This paper proposes a centralized control architecture for harmonic voltage suppression in islanded microgrids. The centralized selective harmonic compensator is developed in addition to the autonomous nonlinear load sharing loop in local controllers of inverter-interfaced Distributed Energy Resource (DER) units. Thus the harmonic voltage distortion caused by the mismatch between the harmonic conductance and characteristic impedance of the distribution feeder can be reduced. Moreover, to overcome the constraint on transmitting harmonic signals by a low-bandwidth communication line, a Park transformation aided signal modulation method is integrated to the centralized control architecture. The operation principle and case studies based on computer simulations are presented in this paper and validate the proposed control architecture.

关键词： Power harmonic filters Harmonic analysis Inverters Voltage control density estimation robust algorithm Centralized control

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Virtual Power Plant (VPP), Definition, Concept, Components and Types

Virtual Power Plant (VPP), Definition, Concept, Components a...

引用

IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC)

作者： H. Saboori M. Mohammadi R. Taghe Center of Excellence for Power System Automation and Operation Iran University of Science and Technology Tehran Iran Islamic Azad University Borujerd Iran

ISBN: (纸本)9781424462537

Along with the rising energy consumption in the world, new technologies will influence the way we generate, distribute and consume energy. Alongside others, distributed energy generation becomes a major trend in many countries. The fast upward penetration of Distributed Energy Resources (DER) and the ongoing trend towards a more competitive electricity market requires new technologies and policies to handle both emerging technical and economic issues. In order to handle distributed generation and to intensify its visibility within power markets, the idea of virtual power plant (VPP) has emerged and is used by many researchers. It is composed of combining various small size distributed generating units to form a "single virtual generating unit" that can act as a conventional one and capable of being visible or manageable on an individual basis. Present paper tries to sheds light on main issues related to the idea of the VPP. The paper will review various definitions and primary concept of VPP, its main components, and finally two principal VPP types namely commercial VPP (CVPP) and technical VPP (TVPP).

关键词： density estimation robust algorithm Power generation Energy storage Generators Energy resources Production Portfolios

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New approaches for smart grid requirements: Grid protection and optimization of distribution grid operation

New approaches for smart grid requirements: Grid protection ...

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IEEE General Meeting Power& Energy Society

作者： S. Ritter H. Ruttinger P. Bretschneider D. Westermann Energy Management Department Application Center System Technology AST Power System Department Ilmenau University of Technology

This paper outlines new approaches in the fields of grid protection and optimization of distribution grid operation. The optimization aims to reduce grid losses by setting an optimal power factor at distributed energy resources at lower voltage levels. A Nonlinear programming approach is described modeling the optimization problem and causing high requirements on the mathematical formulation. Due to providing ancillary services by DER the grid protection has to be considered. Distributed generation causes changes in the direction and magnitude of short-circuit current and due to these misinterpretations of measurements at protection devices. An approach for adapting the protection parameters to the state of distributed in-feed is presented. Additionally an outlook on further developments on grid optimization and grid protection is given.

关键词： Optimization density estimation robust algorithm Load flow Reactive power Mathematical model Switches Distributed power generation

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Distributed Energy Resources (DER) object modeling with IEC 61850–7–420

Distributed Energy Resources (DER) object modeling with IEC ...

引用

Australasian Universities Power Engineering Conference, AUPEC

作者： Taha Selim Ustun Cagil Ozansoy Aladin Zayegh School of Engineering and Science Victoria University Melbourne Australia

The electrical networks are receiving more deployments of Distributed Energy Resources (DERs). In order to control the impact of DERs on existing networks, it is proposed to divide them into more manageable smaller sets which are called `microgrids'. Unlike conventional utility grids, microgrids include generators, storage devices and loads at all levels of the system. Power generation, distribution and consumption levels are not discrete and power flow may occur at any direction. At any point in time, the microgrid may become isolated from the utility grid and continue its operation under islanding conditions. Furthermore, some microgrids may have changing structures with alternative paths and the coupling point for a device or a part of the microgrid may change due to the altering conditions. In order to sustain a safe operation in such a versatile and dynamic structure which has numerous parameters and variables, a new management strategy that has communication lines is required. The need of an extensive communication between the microgrid components is widely accepted in the Power Engineering field. In an effort to standardize the communication methods and modeling IEC 61850 is issued by International Electrotechnical Commission. Currently, there are studies underway to extend this standard with IEC 61850-7-420 so that DERs are also modeled in a standard way. This paper focuses on the communication challenges in a microgrid system, a review of IEC 61850 and the implementation of IEC 61850-7-420 for DER modeling.

关键词： IEC standards density estimation robust algorithm Circuit breakers Generators Fuel cells Power systems Monitoring

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Will the heart of the Smart Grid please stand up?

Will the heart of the Smart Grid please stand up?

引用

IEEE Innovative Smart Grid Technologies - Asia (ISGT Asia)

作者： Lee Margaret Ayers Doble Engineering USA

Metering has long been touted as the center of the Smart Grid but a question the power industry has not yet asked, but is ripe to do so now, is, “Do investments in smart grid technologies make sense for areas where the price per kWh is low and of plenty of capacity exists?” Until price inelasticity increases, or overall network stability requires otherwise, the answer should be, no. And if no, under what circumstances should investment occur? When carefully evaluated, value first lies in the strategic management of assets at the substation. This does not preclude the value metering offers, but companies need a broader approach for their Smart Grid Strategies. This paper presents an example of meter integration with substations as the heart of the Smart Grid, provides a discussion around the Substation of the Future, and offers concepts for rethinking a substation strategy as central to a Smart Grid program.

关键词： Smart grids Substations density estimation robust algorithm Industries Measurement Investments

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Economic Optimal Schedule of CHP Microgrid System Using Chance Constrained Programming and Particle Swarm Optimization

Economic Optimal Schedule of CHP Microgrid System Using Chan...

引用

IEEE Power and Energy Society General Meeting

作者： Z. Wu W. Gu R. Wang X. Yuan W. Liu School of Electrical Engineering Southeast University and Engineering Research Center for Motion Control of MOE Jiangsu Electric Power Research Institute

ISBN: (纸本)9781457710001

Combined heat and power (CHP) system has great prospect for sustainable development and application values with the characteristics of energy saving, environmental protection and economic benefit. This paper deals with the problem of economic optimal operation of CHP system consisting of wind turbine, PV, fuel cell, waste heat boiler, gas boiler, battery, thermal and electric load. Chance constrained programming (CCP) is utilized to consider the random feature wind power, PV power, thermal and electric load. To solve this model, an algorithm of particle swarm optimization (PSO) based on stochastic simulation is proposed. The operation schedules of CHP system are optimized with different deployments of DERs (distributed energy resources). Simulation results show that the proposed method can give suggestions on optimal deployments of DERs and realize dynamic economic dispatch of microgrid to reduce the running cost effectively.

关键词： Combined heat and power Microgrid Renewable energy Economic operation Chance constrained programming Particle swarm optimization Stochastic simulation Cogeneration MICRO-GRID Particle swarm optimization Renewable energy antigen p24 STOCHASTIC SIMULATION Trigeneration Electric loads density estimation robust algorithm

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Extending IEC 61850-7-420 for distributed generators with fault current limiters

Extending IEC 61850-7-420 for distributed generators with fa...

引用

IEEE Innovative Smart Grid Technologies - Asia (ISGT Asia)

作者： Taha Selim Ustun Cagil Ozansoy Aladin Zayegh School of Engineering and Science Victoria University Melbourne Australia School of Engineering andScience Victoria University Melbourne Australia

The growing number of Distributed Energy Resource (DER) deployments in Electrical Networks (ENs) have significant impacts on existing networks. In an effort to control these impacts, it is proposed to divide them into more manageable smaller sets which are called `microgrids'. Unlike conventional utility grids, microgrids include generators, storage devices and loads at all levels of the system. Power generation, distribution and consumption levels are not discrete and power flow may occur at any direction. Furthermore, some microgrids may have changing structures with alternative paths and the coupling point for a device or a part of the microgrid may change due to the altering conditions. In order to sustain a safe operation in such a versatile and dynamic structure, which has numerous parameters and variables (data) to be monitored, communicated and controlled, a new management strategy with extensive communication capability is required. The need of extensive communication between the microgrid components is widely accepted in the Power Engineering field. In an effort to standardize the communication methods and the data to be communicated, the IEC 61850 standard is issued by International Electrotechnical Commission. Currently, there are studies underway to extend this standard with IEC 61850-7-420 so that DERs can also be modeled in a standard way. This paper focuses on the review of IEC 61850-7-420 and its implementation for DER modeling. It also proposes an extension for devices with fault current limiters, a feature not previously included in the existing published standards.

关键词： density estimation robust algorithm IEC standards Generators Fault currents Inverters Fuel cells Object oriented modeling

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