Battery energy storage based synchroconverter control to damp sub synchronous resonance issue in grid forming converters due to 100% renewable penetration

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master_Munazza_Munazza_2025.pdf (1.96 MB)

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School of Electrical Engineering | Master's thesis
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Date

2025-07-30

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Energy Systems and Markets

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Degree programme

Master's Programme in Advanced Energy Solutions

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en

Pages

51

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Abstract

The power system is recently transformed into a renewable rich network and advancing towards 100% renewable energy scenarios due to development in power sector and to achieve the climatic targets. Wind and solar power plants are the major renewable sources which requires Inverter based resources IBRs in converting power from generation to grid. Recently, for increasing power system stability, the control structure of grid forming converters GFM has been developed. To overcome the issues arising in power system due to high penetration of IBRs, different control solutions of GFM have been developed including droop control, Virtual Synchronous Machine (VSM), Power Synchronization Control (PSC), Synchro converter control, Direct Voltage Control etc. Due to increasing IBRs, a new class of stability challenges has been arising in grid as the grid is progressing towards 100% renewables which include weak grid oscillations, Sub Synchronous Resonance (SSR), larger voltage dips, harmonic instability, reduction of transient stability etc. Out of these issues, one of the sever issue is SSR which is caused by the interaction between electrical grid and IBRs such as wind turbines or any other renewable based technologies and this issue can result in blackouts and even damage the equipment. The research studies the existing stability challenges in IBRs based grid, existing control solutions for these challenges and the limitations in already existing solutions. Then, identifying a new class of stability challenge e.g., in my case I have identified the SSR issue, the existing current control solutions are very limited and cannot support the issue properly. Furthermore, the control strategy should be developed to address the SSR issue in future power grid. The research develops the Battery Energy Storage System BESS based Voltage Synchronous Machine VSM control to identify the SSR CGI issue due to 100% penetration of renewables. The research used MATLAB/Simulink software to model the control strategy to address the SSR CGI in GFM. The main objectives of the research are, to identify the limitations of current control solution to identify the existing stability challenges, and then developing our control solution to identify the new stability SSR issue due to CGI and finally testing our control solution under different conditions e.g. under weak and strong grid conditions, different fault scenarios (three phase fault, line-line and line-ground fault), sudden load increase/decrease, controller parameters etc. to find out that our developed control solution for grid-forming inverters will be able maintain system stability at high inverter-based resource shares under various conditions and disturbances and achieve 100% inverter-based resource share with the use of grid-forming inverters.

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Supervisor

Pouresmaeil, Edris

Keywords

control strategy, grid stability, sub synchronous resonance, inverter based resources, grid forming converter, renewable penetration

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https://urn.fi/URN:NBN:fi:aalto-202508196385

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[dipl] Sähkötekniikan korkeakoulu / ELEC