student profile: Mr Shabir Ahmadyar


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Thesis work

Thesis title: Frequency Performance Assessment of Future Grids

Supervisors: Jin MA , Gregor VERBIC

Thesis abstract:

Future grids security will be challenged by the increasing penetration of non-synchronous renewable energy sources (NS-RES). With the increasing integration of NS-RES, power systems dynamic complexity increase. This makes the stability assessment of future grids very difficult. Studies of future grids with high penetration of NS-RES suggest that along with other issues, system frequency control will become a challenging task. Nonetheless, it is very difficult to quantify the findings of those studies and make general conclusions, because most of those studies are based on specific networks under specific operating conditions. Furthermore, the impact of market dynamics and emerging technologies, such as distributed generations with battery storage, on system frequency performance have been overlooked. Hence, in this thesis, we propose a suitable frequency performance assessment framework, as well as utilising some of the conventional and non-conventional resources to enhance system frequency performance with high penetration of NS-RES.
First, we study the impact of high penetration of NS-RES and different penetration levels of prosumers on the performance and frequency stability of the Australian national electricity market (NEM). By doing this, we quantify the connection between the NS-RES and the system frequency performance, as well as different penetration levels of prosumers and the system frequency performance.
Second, we propose a frequency performance assessment framework based on a time-series approach that facilitates the analysis of a large number of future grid scenarios. We use this framework to assess the frequency performance of the Australian future grid by considering a large number of future scenarios and sensitivity of different parameters. By doing this, we identify a maximum non-synchronous instantaneous penetration range for the system from the frequency performance point of view.
Then, to improve the frequency performance of the system with high penetration levels of NS-RES, we evaluate the contribution of different resources, such as synchronous condensers, wind farm's synthetic inertia and a governor-like response from the de-loaded wind farms, on frequency control. The results show that the de-loaded wind farms add more flexibility to the system for frequency control. Considering this, we propose optimal operation and control strategies for the participation of wind farms in frequency control. We do this by explicitly modelling a wind farm and considering the aero-dynamical coupling (i.e. wake effect) among the wind turbines within the wind farm. The results show that with the proposed strategies, it is possible to enhance frequency performance of the system without compromising the efficiency of the wind farms.
Finally, we further develop the concept of wind farm participation in frequency control and propose a coordinated operation strategy for wind farms. In contrast to the conventional wind farm operation strategy, where each wind turbine is optimised individually, we propose different operation strategies to maximise the total output power and rotational kinetic energy of a wind farm for frequency control. The results show that by operating the wind farm in a coordinated way, we can increase both the output power and the rotational kinetic energy of the wind farm. Time-domain simulations show that the proposed operation strategies noticeably improve the wind farm's performance in frequency control.

Selected publications

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Journals

  • Ahmadyar, A., Verbic, G. (2017). Coordinated Operation Strategy of Wind Farms for Frequency Control by Exploring Wake Interaction. IEEE Transactions on Sustainable Energy, 8(1), 230-238. [More Information]

Conferences

  • Ahmadyar, A., Riaz, S., Verbic, G., Riesz, J., Chapman, A. (2016). Assessment of minimum inertia requirement for system frequency stability. 2016 IEEE International Conference on Power System Technology (POWERCON 2016), Piscataway: (IEEE) Institute of Electrical and Electronics Engineers. [More Information]
  • Ahmadyar, A., Verbic, G. (2015). Control strategy for optimal participation of wind farms in primary frequency control. 2015 IEEE Eindhoven PowerTech, PowerTech 2015, Piscataway, New Jersey: (IEEE) Institute of Electrical and Electronics Engineers. [More Information]
  • Ahmadyar, A., Verbic, G. (2014). Exploring wake interaction for frequency control in wind farms. 13th Wind Integration Workshop International Workshop on Large-Scale Integration of Wind Power into Power Systems as well as on Transmission Networks for Offshore Wind Power Plants, Germany: Energynautics.

2017

  • Ahmadyar, A., Verbic, G. (2017). Coordinated Operation Strategy of Wind Farms for Frequency Control by Exploring Wake Interaction. IEEE Transactions on Sustainable Energy, 8(1), 230-238. [More Information]

2016

  • Ahmadyar, A., Riaz, S., Verbic, G., Riesz, J., Chapman, A. (2016). Assessment of minimum inertia requirement for system frequency stability. 2016 IEEE International Conference on Power System Technology (POWERCON 2016), Piscataway: (IEEE) Institute of Electrical and Electronics Engineers. [More Information]

2015

  • Ahmadyar, A., Verbic, G. (2015). Control strategy for optimal participation of wind farms in primary frequency control. 2015 IEEE Eindhoven PowerTech, PowerTech 2015, Piscataway, New Jersey: (IEEE) Institute of Electrical and Electronics Engineers. [More Information]

2014

  • Ahmadyar, A., Verbic, G. (2014). Exploring wake interaction for frequency control in wind farms. 13th Wind Integration Workshop International Workshop on Large-Scale Integration of Wind Power into Power Systems as well as on Transmission Networks for Offshore Wind Power Plants, Germany: Energynautics.

Note: This profile is for a student at the University of Sydney. Views presented here are not necessarily those of the University.