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Frequency Control Improvement of Power Systems with High Penetration of Wind Power Generation

Ravanji, Mohammad Hassan | 2020

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 52741 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Parniani, Mostafa
  7. Abstract:
  8. Global trends of electrical energy production indicate high penetration of renewable wind energy resources in power grids around the world.Although high penetration of these resources benefits the grid operators and end-users in various aspects, several new challenges should be addressed. These challenges can be focused on in various studies with different time intervals and different technical and economic issues. One of the most important issues relates to the system frequency regulation and control aspects in high wind and photovoltaic (PV) penetrated grids. This is due to the fact that wind turbine generators (WTGs) as well as PV systems do not provide inertial response for the system and accordingly do not participate in power system frequency support plans. Recently, employing virtual inertial controllers (VICs) has been introduced as the main solution for these issues. Encountering severe frequency events, such as outage/connection of bulk loads/synchronous generators to the grid, these controllers emulate similar behavior of synchronous generators for the WTGs; therefore, these units can effectively participate in power system frequency support controls. However, increasing the VIC-equipped WTGs penetration ratio may result in further challenges for the system, such as grid and WTGs power oscillatory behavior and WTG internal instability. In this dissertation, first, common VICs in the literature are investigated and the mentioned challenges are elaborated. Then, several solutions are proposed for these challenges. For this purpose, first, a modified virtual inertial controller (MVIC) is proposed, which improves the grid and WTGs power oscillatory behavior acceptably, and results in WTGs prudential participation in the grid frequency control. Prudential participation is a rather new concept presented in this thesis, which is discussed in detail in this dissertation. For this purpose,a novel non-linear large-perturabtion model is proposed for high-penetrated power systems and accordingly two retuning methods are proposed for typical VICs, which can resolve the aforementioned WTGs internal instability issue. In addition, to obtain WTGs transfer function, a linear model is proposed, which can be used for various frequency studies. Finally, frequency stability of WTGs equipped with various auxiliary controllers exposed to variable wind speeds is investigated
  9. Keywords:
  10. Variable Speed Wind Turbine ; Frequency Regulation Market ; Virtual Inertial Controller ; Small-Disturbance Modeling ; Large-Disturbance Modeling ; Power System Frequency Response Model

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