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<span class="x_elementToProof" style="font-family:"Calibri",sans-serif; color:black"> </span><img width="600" height="171" id="x_x__x0000_i1025" alt="Dissertation Defense Announcement at the Cullen College of Engineering" style="color:rgb(0,0,0); font-size:16px; font-style:normal; font-variant-ligatures:normal; font-variant-caps:normal; font-weight:400; font-family:"Times New Roman",serif; width:600px; height:171px; max-width:initial" src="https://ci6.googleusercontent.com/proxy/LvWUba1VeNhfOVcs60QzPiTNIqs5YUBd3B_W7jWijS4JX84N3levSVZiVkQws6De1xogrebFMi4S8lWTSD5VoZyghYQfbGOd1RymzvcA0pT_rKkr8gKpzy_RagnGZ_QhIqYtpH0xsxY=s0-d-e1-ft#https://www.egr.uh.edu/sites/www.egr.uh.edu/files/enews/2022/images/dissertation1.png"><span class="x_elementToProof" style="font-size:12pt; color:black; font-family:Calibri,sans-serif">
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<strong><span style="font-size:18.0pt; font-family:"Arial",sans-serif; color:#C8102E">Power and Management Strategies</span></strong><span style="font-size:18.0pt; font-family:"Arial",sans-serif; color:#C8102E"></span></p>
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<strong><span style="font-size:18.0pt; font-family:"Arial",sans-serif; color:#C8102E">of Battery Energy Storage Systems for Grid </span></strong><b><span style="font-size:18.0pt; font-family:"Arial",sans-serif; color:#C8102E">Integration</span></b><span style="font-size:18.0pt; font-family:"Arial",sans-serif; color:#C8102E"></span></p>
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<strong><span style="font-size:13.5pt; font-family:"Arial",sans-serif; color:#222222">Jean M. L. Fonseca</span></strong><span style="font-size:18.0pt; font-family:"Arial",sans-serif; color:#C8102E"></span></p>
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<span style="font-size:10.5pt; font-family:"Arial",sans-serif; color:#222222">April 26, 2022; 10:00 AM - 12:30 PM (CST)</span><span style="font-size:18.0pt; font-family:"Arial",sans-serif; color:#C8102E"></span></p>
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<span style="font-size:10.5pt; font-family:"Arial",sans-serif; color:#222222">Teams: <a href="https://urldefense.com/v3/__https://teams.microsoft.com/l/meetup-join/19*3ameeting_OTM4YWJmNWItYzRlNi00NmE5LWI0YzUtNmQ5MjQyOGM5YWFh*40thread.v2/0?context=*7b*22Tid*22*3a*22170bbabd-a2f0-4c90-ad4b-0e8f0f0c4259*22*2c*22Oid*22*3a*2206f85652-d672-4cf4-9276-4586e5c4c7f6*22*7d__;JSUlJSUlJSUlJSUlJSUl!!LkSTlj0I!FqRGxtzNBwVP_6mouvbelPM1FG7oRRpQb2B08BbD1CqVaNaRA8I7ANOiJ_weLTnPc2-twzsPq23qYQF3PfTcoY5GzoQ$" data-auth="NotApplicable" title="https://teams.microsoft.com/l/meetup-join/19%3ameeting_OTM4YWJmNWItYzRlNi00NmE5LWI0YzUtNmQ5MjQyOGM5YWFh%40thread.v2/0?context=%7b%22Tid%22%3a%22170bbabd-a2f0-4c90-ad4b-0e8f0f0c4259%22%2c%22Oid%22%3a%2206f85652-d672-4cf4-9276-4586e5c4c7f6%22%7d">Ph.D.
Defense Teams Room</a></span><span style="font-size:18.0pt; font-family:"Arial",sans-serif; color:#C8102E"></span></p>
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<strong><span style="font-size:10.5pt; font-family:"Arial",sans-serif">Committee Chair:</span></strong><span style="font-size:10.5pt; font-family:"Arial",sans-serif"></span></p>
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<span style="font-size:10.5pt; font-family:"Arial",sans-serif">Kaushik Rajashekara, Ph.D.</span></p>
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<strong><span style="font-size:10.5pt; font-family:"Arial",sans-serif">Committee Members:</span></strong><span style="font-size:10.5pt; font-family:"Arial",sans-serif"></span></p>
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<span style="font-size:10.5pt; font-family:"Arial",sans-serif; background:white">Harish Krishnamoorthy</span><span style="font-size:10.5pt; font-family:"Arial",sans-serif">, Ph.D. | <span style="background:white">Xingpeng Li</span>, Ph.D. | David Jackson, Ph.D.
| Jian Shi, Ph.D.</span></p>
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<strong><span style="font-family:"Arial",sans-serif; color:#C8102E">Abstract</span></strong><span style="font-family:"Arial",sans-serif; color:#C8102E"></span></p>
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<span style="font-family:"Arial",sans-serif; color:black">Battery energy storage system (BESS) plays a critical role in grid applications, where it can perform services such as mitigation of the intermittency of renewable energy, grid frequency regulation,
peak shaving, and grid voltage support/var compensation. To interface the BESS to the grid, Modular Multilevel Converters (MMC) are being widely considered, particularly for medium and high voltage applications. This dissertation develops power strategies
and energy requirements for a BESS-MMC. The research work starts from developing battery models for grid applications to system-level operation, including BESS and the electric grid. </span></p>
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<span style="font-family:"Arial",sans-serif; color:black">A novel methodology to estimate the parameters of the equivalent circuit model (ECM) for lithium-ion battery cells focusing on their use in grid applications is developed. Parameter dependencies on the
state of charge (SoC) and temperature are included in the proposed methodology and correlated through polynomial regression. Accelerated degradation tests are performed to obtain the parameter variation as the battery ages. The obtained information is being
used to design components in the BESS-MMC, controller parameters, SoC, and State of Health (SoH) estimation. </span></p>
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<span style="font-family:"Arial",sans-serif; color:black">The dissertation also investigates the precise capacitor energy requirements for various operations of BESS-MMC, which include arm/phase power transfer. Further, the relation between the controller design
and the submodule’s capacitor sizing in terms of its energy requirements is also explored. Design guidelines for the module level voltage control to attenuate battery ripple and a detailed analysis of the capacitor energy requirement in each operating mode
are presented. </span></p>
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<span style="font-family:"Arial",sans-serif; color:black">Aiming to improve the BESS-MMC resiliency by maintaining it connected to the electrical grid, faulty scenarios involving asymmetric grid voltage conditions and an asymmetric power available in each phase
and arm are considered. Several power and SoC balancing techniques with defined active power limits to avoid battery overuse are proposed and verified through C-HIL results. </span></p>
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<span style="font-family:"Arial",sans-serif; color:black">The use of BESS-MMC as an interlinking converter (IC) between AC and DC microgrids in a hybrid microgrid environment is explored. This avoids the connection of battery modules into either DC or AC microgrid
and provides complete decoupled operation between grids. Control strategies, as well as possible power management strategies, are proposed and verified through C-HIL results. </span></p>
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<span style="font-family:"Arial",sans-serif"><img border="0" width="600" height="82" id="x_x__x0000_i1026" alt="Engineered For What's Next" style="width:6.25in; height:.8541in" src="https://ci6.googleusercontent.com/proxy/Hq2wYknEttMelFsTEDPcPaMLFaflZA1NtvvYMmdujm5jNyliC0SBG9XveUwFZPcN-lCY-mfTmchH7briYX3EPBDJpQzTEcQ8ZmYnKNv9oHgaBbFyWoqPkSebP0KGj8XUCGYviN2RuHM=s0-d-e1-ft#https://www.egr.uh.edu/sites/www.egr.uh.edu/files/enews/2022/images/dissertation2.png"></span></p>
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