Emergency Power for Wind Turbine Yaw System - Project initialization tool
Author
Summary, in English
The Yaw Power Backup System (YPBS) is a safety system that needs to be incorporated in the Wind Power Plant (WPP) in order to provide emergency power during a power outage. The YPBS enables the Wind Turbine Generator (WTG) to perform a yawing operation in extreme weather conditions. The yawing operation ensures the rotor is aligned with incoming wind, minimizing the acting forces on the blades and structure. The YPBS consists of a central placed emergency backup generator that generates power to the loads. A step-up transformer that transmits power from the generator to the internal electrical system of the WPP network and a shunt reactor that compensates for the capacitance in the collector cable system. The YPBS needs to supply power to the active components and provide frequency and voltage stability in the WPP. The YPBS component design is site-specific and requires information about the electrical infrastructure of the WPP in order to supply the required power and operate safely. In this thesis project, a synthesis tool is developed to identify the loads and to obtain an early estimation of the ratings and costs for an internal evaluation of the YPBS project. A responsibility matrix is also developed to identify the work activities and responsibilities for management of the YPBS project during construction and service phase together with Vestas engineers.
Different models of WPP were developed and investigated for power flow analysis. Two approaches were implemented on each WPP with fixed and variable shunt reactor to validate if the component ratings from the synthesis tool are operating within its capability limits and fulfilling operation requirements. A study for sequential starting of the yaw motors where concluded to validate the required backup generator ratings from the synthesis tool.
The results indicate that the synthesis tool is estimating accurate and reliable ratings and is validated by simulations and by existing projects. A YPBS with a variable shunt reactor results in a generator operating more efficiently and can decrease 25 % in size compared to when a fixed shunt reactor is applied. Sequential starting study indicates that if the starting phase is divided in several steps, the generator size can be reduced by a factor of 2.4, as a result of the transient inrush reduction. The study also indicates that a backup generator can be sized after maximum steady state operating condition.
Initialization tool will be applied as an official tool in Vestas and the responsibility matrix is created and agreed on by all involved stakeholders and will be implemented in future projects.
Different models of WPP were developed and investigated for power flow analysis. Two approaches were implemented on each WPP with fixed and variable shunt reactor to validate if the component ratings from the synthesis tool are operating within its capability limits and fulfilling operation requirements. A study for sequential starting of the yaw motors where concluded to validate the required backup generator ratings from the synthesis tool.
The results indicate that the synthesis tool is estimating accurate and reliable ratings and is validated by simulations and by existing projects. A YPBS with a variable shunt reactor results in a generator operating more efficiently and can decrease 25 % in size compared to when a fixed shunt reactor is applied. Sequential starting study indicates that if the starting phase is divided in several steps, the generator size can be reduced by a factor of 2.4, as a result of the transient inrush reduction. The study also indicates that a backup generator can be sized after maximum steady state operating condition.
Initialization tool will be applied as an official tool in Vestas and the responsibility matrix is created and agreed on by all involved stakeholders and will be implemented in future projects.
Summary, in English
A safety backup system is required to be implemented in Wind Power Plants (WPP), in order to provide emergency power during a main power outage. The Yaw Power Backup System (YPBS) enables the Wind Turbine Generator (WTG) to perform a yawing operation in extreme weather conditions, reducing the acting forces from the wind and ensuring safety to the WTG. The purpose of this project is to develop a synthesis tool that estimates the ratings and cost of the components and to create a responsibility matrix that identifies the work activities and responsibilities during construction and service phase for the YPBS project. The studies include different models and sizes of WPP and WTGs. The tool is validated by simulations in DIgSILENT PowerFactory and Caterpillar SpecSizer.
The results indicate that the synthesis tool is estimating reliable ratings and the components are operating within the safety requirements. The responsibility matrix is created and will be implemented in future projects.
The results indicate that the synthesis tool is estimating reliable ratings and the components are operating within the safety requirements. The responsibility matrix is created and will be implemented in future projects.
Publishing year
2020
Language
English
Publication/Series
CODEN:LUTEDX/TEIE
Full text
- Available as PDF - 16 MB
- Download statistics
Document type
Student publication for professional degree (Master's level)
Topic
- Technology and Engineering
Report number
5437
Supervisor
- Avo Reinap
- Olof Samuelsson (Dr.)
Scientific presentation