go to top scroll for more


Projects: Projects for Investigator
Reference Number NIA_NGET0129
Title Investigation of sub-synchronous between wind turbine generators and series capacitors
Status Completed
Energy Categories Renewable Energy Sources(Wind Energy) 50%;
Other Power and Storage Technologies(Electricity transmission and distribution) 50%;
Research Types Applied Research and Development 100%
Science and Technology Fields ENGINEERING AND TECHNOLOGY (Electrical and Electronic Engineering) 100%
UKERC Cross Cutting Characterisation Not Cross-cutting 100%
Principal Investigator Project Contact
No email address given
National Grid Electricity Transmission
Award Type Network Innovation Allowance
Funding Source Ofgem
Start Date 01 March 2014
End Date 01 July 2016
Duration 28 months
Total Grant Value £305,000
Industrial Sectors Power
Region London
Programme Network Innovation Allowance
Investigators Principal Investigator Project Contact , National Grid Electricity Transmission (100.000%)
Web Site http://www.smarternetworks.org/project/NIA_NGET0129
Objectives The objectives of this research project are to: Highlight any potential SSI issues that can occur between series capacitors and wind turbine generators Establish a control system that could be implemented as part of the wind turbine converters to mitigate any SSI issues The project will be deemed successful if the above-mentioned objectives are delivered and when the full report detailing the research, modelling and results is delivered upon completion of the project.
Abstract Series compensation will be implemented on the GB transmission network in the near future in order to enhance the transfer capability of the Anglo-Scottish boundary. A possible risk associated with series capacitors is the occurrence of Sub-Synchronous Interactions (SSI) which are oscillations involving generator shafts and power electronic controllers. If not damped, these oscillations can potentially lead to component fatigue, life-time reduction of equipment and failures of both synchronous and induction generators. These affected generators will have to be withdrawn from the network thereby reducing the overall generation availability to meet the demand, compromising the security of supply and possibly delaying the achievement of renewable energy and carbon emissions targets. In 2009 a Sub Synchronous Control Interaction (SSCI) event occurred in Texas, where a wind turbine generator was connected directly with a series compensated line during an outage. During this event the wind turbines were damaged through excessive current. The risk of occurrence of sub-synchronous interactions (SSI) in the future GB network as a result of increasing onshore series compensation can neither be confirmed nor ruled out unless in-depth technical studies are carried out. The GB network is very unique in nature with respect to its topology, the location of the series capacitors and that of the wind farms. The standard IEEE benchmark models are not suitable to provide an accurate representation of possible SSI in the GB system. An alternative approach consisting of developing specific models is therefore required. Research The Method that has been proposed for this project include: An investigation and analysis of the possible interactions of wind turbine generators (DFIGs and FCIGs) with series compensation in the GB system. This would involve the modelling of relevant network components in MATLAB and Simulink. A literature research into the mitigation of sub-synchronous interaction using a damping controller at the grid side converter of wind turbine generators with close proximity to synchronous generators suffering from sub-synchronous oscillationsNote : Project Documents may be available via the ENA Smarter Networks Portal using the Website link above
Publications (none)
Final Report (none)
Added to Database 21/08/18