Investigation of inertial support limits in wind turbines and the effects on the power system stability

Duymaz, Erencan
In this study, the inertial support implementation is studied for variable speed wind turbines with a full-scale power electronics. To increase the active power as desired, Machine Side Converter is modified with an additional control loop. In the first part of the thesis, active power of the wind turbine is increased to the limits and the maximum achievable active power is found out to be restricted by the wind speed. It is found that the wind turbine can increase its output power by 40% of rated power in the low and medium wind speeds. Moreover, even though the high speed scenarios give limited increased power, it does not require any speed recovery state. The probability of the inertial support is found according to the wind speed measurement taken from field. In the second part of the thesis, the synthetic inertia implementation is presented by the provision of inertial support which is proportional to the rate of change of frequency. The effect of the implementation in the P.M.Anderson test case is observed for different inertia constants. It is discovered that the effect of renewable penetration in the frequency stability is negligible when the synchronous generators are kept in the operation. Nonetheless, frequency stability in the test system gets more vulnerable to renewable energy penetration when the conventional generators are decommissioned by the economical concerns. In this case, the synthetic inertia implementation with different inertia constants possesses the ability to lower RoCoF following a frequency disturbance. The effects of the synthetic inertia on the Turkish electricity network is also investigated. Finally, the wind turbine inertial support is evaluated in terms of economics for the energy provider perspective.


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In this thesis a wind turbine emulator is developed to replicate the mechanical and electrical behavior of a real wind energy conversion system. A scaling down algorithm is developed to scale down the mechanical behavior of a real wind energy conversion system to a laboratory scale wind turbine emulator. A user interface software is developed to be used as a supervisory control and data acquisition system for the wind turbine emulator in LABVIEW environment. The accuracy of the scaling down algorithm is ver...
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A dataset of wind tunnel power and wake flow measurements on a setup of three aligned model wind turbines is presented. The power outputs of the three turbines are in good agreement with measurements from a full-scale wind farm of similar inter-turbine spacing. A comparison of the wake flow behind the first row and the second row shows a significantly higher mean velocity loss behind the second row justifying a further power drop from the second to the third row turbine. Curtailing the front row turbine to ...
Dynamic modelling and simulation of a wind turbine
Altuğ, Ayşe Hazal; Yavrucuk, İlkay; Department of Aerospace Engineering (2015)
In this thesis, a dynamic model for a horizontal axis wind turbine is developed for an upwind configuration using the MATLAB/Simulink environment. Blade Element Momentum Theory is used to model the rotor. It is assumed that the rotor blades are rigid and wind speed is uniform. Aerodynamic and gravitational forces are calculated as distributed loads. Verification of the model is done by using the LMS Samtech, Samcef for Wind Turbines software. Aerodynamic properties of the blades, sectional loads and moments...
Comparative study of transient and quasi-steady aeroelastic analysis of composite wind turbine blade in steady wind conditions
Sargın, Hakan; Kayran, Altan; Department of Aerospace Engineering (2014)
The objective of this study is to conduct a comparative study of the transient and quasi-steady aeroelastic analysis of a composite wind turbine blade in steady wind conditions. Transient analysis of the wind turbine blade is performed by the multi-body dynamic code Samcef Wind Turbine which uses blade element momentum theory for aerodynamic load calculation. For this purpose, a multi-body wind turbine model is generated with rigid components except for the turbine blades. For the purposes of the study, a r...
Citation Formats
E. Duymaz, “Investigation of inertial support limits in wind turbines and the effects on the power system stability,” M.S. - Master of Science, Middle East Technical University, 2019.