Wind Farms as Reactive Power Ancillary Service Providers—Technical and Economic Issues

2009 ◽  
Vol 24 (3) ◽  
pp. 661-672 ◽  
Author(s):  
N.R. Ullah ◽  
K. Bhattacharya ◽  
T. Thiringer
Keyword(s):  
Reactive Power ◽  
Service Providers ◽  
Wind Farms ◽  
Ancillary Service ◽  
Economic Issues

Reactive Power Ancillary Service from Wind Farms

2007 ◽  
Author(s):  
Nayeem Rahmat Ullah ◽  
Kankar Bhattacharya ◽  
Torbjorn Thiringer
Keyword(s):  
Reactive Power ◽  
Wind Farms ◽  
Ancillary Service

scholarly journals Plug-in Electric Vehicles for Grid Services Provision: Proposing an Operational Characterization Procedure for V2G Systems

Energies ◽  
2020 ◽  
Vol 13 (5) ◽  
pp. 1240 ◽  
Author(s):  
Ângelo Casaleiro ◽  
Rodrigo Amaro e Silva ◽  
João Serra
Keyword(s):  
Electric Vehicles ◽  
Power Factor ◽  
Power Flow ◽  
Reactive Power ◽  
Service Providers ◽  
Ancillary Service ◽  
Grid Services ◽  
Vehicle To Grid ◽  
Operational Characteristics ◽  
Characterization Procedure

Plug-in electric vehicles (PEVs) are expected to play a role as power grid ancillary service providers through vehicle-to-grid (V2G) chargers, enabling higher levels of renewable electricity penetration. However, to fully exploit the storage capacity of PEVs and fast responsiveness, it is crucial to understand their operational characteristics. This work proposes a characterization procedure for V2G systems providing grid services. It extends the existing literature on response time, AC/DC conversion and reactive power assessment. Illustrative results were obtained by implementing the procedure using a Nissan Leaf battery electric vehicle (BEV) connected to a remotely operated commercial V2G CHAdeMO charger. The V2G system was characterized as having a relative inaccuracy and variability of response inferior to 3% and 0.4%, respectively. Its average communication and ramping times are 2.37 s and 0.26 s/kW, respectively. Its conversion efficiency and power factor both showed degradation in the power values below 50% of the charger’s nominal power. Moreover, the proposed visualizations revealed that: i) the V2G system implements power requests for the DC power flow; ii) the power factor control algorithm was nonoperational; and iii) the acquired data can leverage statistical models that describe the operation of V2G systems (which is of extreme value for researchers and operators).

Photovoltaic Generating Units as Reactive Supply Ancillary Service Providers

2008 ◽  
Vol 9 (4) ◽  
Author(s):  
Federico Delfino ◽  
Renato Procopio
Keyword(s):  
Reactive Power ◽  
Service Providers ◽  
Electromagnetic Transients ◽  
System Component ◽  
Ancillary Service ◽  
Distribution Grid ◽  
Regulation Scheme ◽  
Active And Reactive Power ◽  
Control Scheme ◽  
Advanced Control

This paper addresses the issue of the application of PhotoVoltaic (PV) Distributed Generation (DG) units for supplying reactive power to the grid. In order to reach this aim, an advanced control scheme to suitably drive the injection of both active and reactive power into a MV radial distribution grid has been developed. Such algorithm allows a decoupled control of active and reactive power by properly adjusting the modulating signals of a PWM interface converter with the grid. A closed loop regulation scheme has been derived and guidelines for the choices of the reference quantities and for the design of the regulators are provided. The control algorithm has been applied to a real MV grid-connected PV power plant, which has been simulated in the PSCAD – EMTDC electromagnetic environment, in order to represent, with high detail, every system component and to thoroughly analyze the occurring electromagnetic transients. The positive effect of reactive power support to the grid from the PV unit has been highlighted, showing benefits on the grid current and voltage profiles with respect to the classical configuration, where the DG system behaves as a sole active power source.

scholarly journals Doubly fed induction generators to enhance inter-area damping based on a Robust controller: $${{\varvec{H}}}_{2}/{{\varvec{H}}}_{\infty }$$ Control

2021 ◽  
Vol 3 (1) ◽  
Author(s):  
Ali Goodarzi ◽  
Ali Mohammad Ranjbar ◽  
Moslem Dehghani ◽  
Mina GhasemiGarpachi ◽  
Mohammad Ghiasi
Keyword(s):  
Working Conditions ◽  
Reactive Power ◽  
Wind Farms ◽  
System Stability ◽  
Pole Placement ◽  
Linear Matrix ◽  
Robust Controller ◽  
Induction Generators ◽  
Doubly Fed ◽  
Oscillation Damping

AbstractIn this study, an auxiliary damping controller based on a robust controller considering the active and reactive power control loops for a doubly-fed induction generator for wind farms is proposed. The presented controller is able to improve the inter-area oscillation damping. In addition, the proposed controller applies only one accessible local signal as the input; however, it can improve the inter-area oscillation damping and, consequently the system stability for the various working conditions and uncertainties. The oscillatory modes of the system are appointed using the linear analysis. Then, the controller’s parameters are determined using the robust control approaches ($${H}_{\infty }/{H}_{2})$$ H ∞ / H 2 ) with the pole placement and linear matrix inequality method. The results of the modal analysis and time-domain simulations confirm that the controller develops the inter-area oscillation damping under the various working conditions and uncertainties.

scholarly journals Wealth of Wind and Visitors: Tourist Industry Attitudes towards Wind Energy Development in Iceland

Land ◽  
2021 ◽  
Vol 10 (7) ◽  
pp. 693
Author(s):  
Anna Dóra Sæþórsdóttir ◽  
Margrét Wendt ◽  
Edita Tverijonaite
Keyword(s):  
Land Use ◽  
Wind Energy ◽  
Wind Turbines ◽  
Wind Farm ◽  
Service Providers ◽  
Wind Farms ◽  
Energy Development ◽  
Tourism Industry ◽  
Land Use Conflicts ◽  
Wind Energy Development

The interest in harnessing wind energy keeps increasing globally. Iceland is considering building its first wind farms, but its landscape and nature are not only a resource for renewable energy production; they are also the main attraction for tourists. As wind turbines affect how the landscape is perceived and experienced, it is foreseeable that the construction of wind farms in Iceland will create land use conflicts between the energy sector and the tourism industry. This study sheds light on the impacts of wind farms on nature-based tourism as perceived by the tourism industry. Based on 47 semi-structured interviews with tourism service providers, it revealed that the impacts were perceived as mostly negative, since wind farms decrease the quality of the natural landscape. Furthermore, the study identified that the tourism industry considered the following as key factors for selecting suitable wind farm sites: the visibility of wind turbines, the number of tourists and tourist attractions in the area, the area’s degree of naturalness and the local need for energy. The research highlights the importance of analysing the various stakeholders’ opinions with the aim of mitigating land use conflicts and socioeconomic issues related to wind energy development.

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