The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
The large scale connection of power generation in distribution networks causes deregulation in power system networks. This paper focuses on studying the voltage changes at each node of the distribution network before and after the insertion of wind turbines as power generators, and also proposes two optimal voltage control methods in order to maintain a stable voltage profile. Results of the simulations...
Nowadays, the continuously increasing of the energy consumption all over the world presents the cause of renewable energy sources development. In this context, wind energy conversion systems (WECS) based on double fed induction generator (DFIG) are widely used in both grid connected and stand-alone modes. In both cases, management and control technologies are widely developed in the literature. In...
Wind turbine system (WTS) now a day has turned out to be exceptionally useful technique to minimize the centralization of electrical power particularly in provincial territories and rural areas. In any grid connected WTS there are alternatives for receiving reactive power from main grid but if it is islanded or made off grid in that case we need to look for different choices for voltage profile improvement...
The energy demands increment, perishing resources of fossil fuels and growing pollution levels encourage more electricity generation using renewable energy sources such as wind, solar, geothermal, tidal etc. Generation of electricity using high speed wind seems a viable and environment friendly solution to meet energy crisis. However, due to variable nature of wind speed, it is difficult to supply...
This paper presents a model of hybrid energy system (HES) consisting of wind energy system (WES) and solar photovoltaic (PV) solar system connected with the grid and its performance is examined under load variation and systems input parameters. A centralized DC bus Architecture power generation is used for the proposed HES that includes a Shockley diode equation PV array and wind turbine driven by...
The increase of distributed generation is expected to generate instabilities, such as power imbalances or voltage deviations in the power system. At the distribution level, maintaining the bus voltages within the stipulated limits is one of the major challenges for the distribution system operator. Under low penetration levels, several voltage regulation elements have been efficiently employed up...
This paper presents the modelling and simulation of a wind turbine driven Permanent Magnet Synchronous Generator connected to a load. The system has been tested at different wind speeds. The machine side controller has been designed to match Maximum Power Point Tracking (MPPT) to obtain high extraction of wind power when connected to a load, while the load side controller fixes the DC voltage that...
This paper discusses the possibilities and the merits of adopting a DC microgrid strategy for enhancing the economics and the resilient operation of the distributed generation systems, and tests the proposed hierarchical control strategy that applies to a DC microgrid based on an existing microgrid at Illinois Institute of Technology (IIT). The simulation results are compared with those of an AC microgrid...
This paper investigates the control design when a wind power base of doubly fed induction generators (DFIGs) is directly connected to line-commutated converter (LCC) HVDC link. Firstly, the positive feedback characteristic of PLL in DFIG is analyzed, which allows DFIG to self-maintain frequency without an available grid voltage reference. Furthermore, in order to avoid the rapid variation of HVDC...
This paper presents a new method to asses voltage stability of unbalanced distribution systems with wind turbine generation systems (WTGSs). In the voltage tracing process, the Lagrange linear and quadratic interpolations have been applied to predict voltage magnitudes and phase angles. The predicted solutions are then corrected using the unbalanced three-phase forward/backward power flow solver....
A microgrid has been recognised as a potential solution for decentralised systems in supplying electricity to remote areas. Typically, a microgrid operates in parallel with the utility grid. However, this work investigates the synchronisation and connection of two or more microgrids. The work specifically looks at scenarios where connection to a utility grid is complex due to technical and economical...
This paper presents a comprehensive study showing the impacts of different doubly fed induction generator (DFIG) wind turbines control modes on long-term voltage stability. The study considers fixed voltage control and power factor control modes. The analyses also consider the dynamic models of Over Excitation Limiter (OEL) and On Load Tap Changers (OLTC) combined with static and dynamic loads using...
This paper presents the methodology proposed and implemented to obtain a very large scale test model for demonstration purpose in FP7 PEGASE project. The model is meant to be representative of the European interconnected transmission network main characteristics. It will be available for public use in benchmarking and testing of power systems simulation tools, from static to dynamic simulation applications...
Penetration levels of renewable resources on distribution systems are increasing due to the mandated programs and associated economic incentives. Therefore the effects of these interconnections on the systems will need to be studied and evaluated. This paper's concentration will be on voltage profile of a distribution system subject to high penetration levels of different renewable sources such as;...
This paper presents potential barriers to integrate the squirrel cage induction generator (SCIG) and doubly fed induction generator (DFIG) type wind turbine in distribution networks. The analysis is carried out over a 16 bus distribution test system. Both static and dynamic analyses are performed to see the impact of two different generators on the distribution system. The simulation results show...
This paper develops a statistical methodology to identify the probabilities of when and where the voltage violations occurring in residential, industrial and commercial areas respectively with cumulative penetration of SWTs. The proposed methodology is applied to a typical U.K. distribution network model, and results indicate that industrial and commercial weekends have the highest probabilities of...
Microgrids are receiving a lot of attention to utilize distributed generations in a sub-system and provide higher efficiency and reliability and support local loads. A high renewable-energy penetrated microgrid is studied in this paper. The distribution system and the loads in the microgrid are represented by a properly scaled 12kV IEEE 34 bus system. The central power is replaced with a 1.875MVA...
Microgrid is a newly proposed organization of distributed generation system. It can operate in net-connected mode and islanded mode, when the operation switches between the two types of mode, the variety power will emerge. If this happens, the level of the system voltage will be fluctuating in a wide range, and the system frequency will also be fluctuating in an unacceptable range. The load power...
The proper modeling of wind energy projects in system studies is very important. Wind farms can consist of hundreds of units, resulting in a wind farm often capable of producing several hundred MW. The location of a wind farm is selected primarily based on good wind conditions; these conditions often coincide with relatively remote parts of the power system. This increases the need for good models...
GE Energy has an ongoing effort dedicated to the development of models of GE wind turbine generators (WTG) suitable for representing wind plants in system impact studies. This paper documents the present recommendations for dynamic modeling of GE wind plants using either Doubly Fed Asynchronous Generators (DFAG) or Full Conversion (FC) technology. This includes GE's 1.5 and 1.6 MW, as well as 2.5...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.