Thesis – Control of Renewable Hybrid Plants in near-Future Power Systems

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Thesis – Control of Renewable Hybrid Plants in near-Future Power Systems


Increasing amounts of decentralized renewable power are being deployed worldwide answering to an increasing demand of clean energy. The innate volatility of renewable sources, increases the difficulties of the TSOs to keep the balance between generation and demand, leading to higher incidents of frequency disturbances. In addition, everchanging voltage levels (due to generation volatility, but also to power injection at all levels of the network), along with inertia reduction (due to power electronic interfaced generators) also present stability challenges. Therefore, sooner than later, renewable plants will be demanded to provide ancillary services in order to ensure the system stability.

It is in this context that the concept of Hybrid Power Plant (HyPP) arises as a combined generation unit compound by a wind farm, a photovoltaic plant and a battery storage system. The HyPP poses as capable of providing bulk generation, flexibility and ancillary services, due to its large-scale size, increased full-capacity hours and energy storage capability. However, HyPP is a relatively young technology; thus there is still research to be done in order to fully exploit its potential.

Scope and goals of the thesis

The goal of this thesis is to understand how large disturbances affect the regular operation of a large power system and implement solutions based on controlling HyPPs to ensure the network’s safe operation. The operational behavior of the power system should be compared between its current configuration (regulation based on thermal, hydro and gas plants) against a scenario dominated by renewable energy.

In the thesis, the student is encouraged to develop his/her own research questions and take lead the of the thesis deliverables along with the support of his/her supervisors at Vattenfall. The main focus is on studying power systems with high rates of HyPPs while running different power system studies. As a suggestion the student is expected to either import Vattenfall’s HyPP models into a power system simulation software of his/her choice or develop his/her own models. Afterwards, the student is expected to perform a series of comparative studies that evaluates the HyPP performance indices against classical power systems.


The ideal candidate is expected to have an interest towards power system dynamics and willingness to learn about exciting topics like: HyPPs and power system stability (mostly frequency stability), but also, inertia provision, renewable energy and power plant control. The ideal candidate is expected to be familiar with control theory, power system stability and power system simulators such as: PSS/E, Matlab, or PowerFactory. The working language will be English and the location will be in Solna offices – Stockholm, Sweden. The thesis work is expected to start in January 2020 and finish June 2020, and it will be reimbursed with a settlement depending on the quality of the work at the end of the duration.

Vattenfall Research and Development is responsible for conducting business driven technical development that creates value for the company and helps realizing our strategy. The corporate R&D unit employs approximately 116 people located in Solna and Älvkarleby in Sweden and in Kolding in Denmark. At R&D we go from ideas to real projects, we believe that our employees can change the future of Vattenfall and that their ideas are extremely important.

We offer a flexible and warm work environment, a diverse group in age, gender, and nationalities where everyone is on an equal footing, a team of considerable freedom to shape your own day-to-day activities and the opportunity to work in an exciting and changing technical field of strategic importance to the company.


Please make sure to include in English in the application your CV, university transcripts complemented with a short cover letter describing your educational background, experience if any, and your overall reflection about this thesis.


For more info or questions about the thesis please contact either Daniel Vázquez Pombo (danielvazquez.pombo@vattenfall.com, +45 28184000) or Firas Daraiseh (firas.daraiseh@vattenfall.com), (+46 – 727320590).

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Thesis – Control of Renewable Hybrid Plants in near-Future Power Systems

Vattenfall AB