[{"abstract":[{"lang":"eng","text":"Modular solid-state transformers (SSTs) are a promising technology in converting power from a 10kV three-phase medium voltage to a lower DC-voltage in the range of 100…400V to provide pure DC power to applications such as electrolyzers for hydrogen generation, data centers with a DC power distribution and DC micro grids. Modular SSTs which can be interpreted as modular multilevel converters with an isolated DC-DC output stage per module, are designed with redundant modules to increase reliability. Usually, each of the three arms operates independently, and therefore, only a fixed number of faulty modules can be compensated in each arm, even if all modules are operational in the remaining two arms. With the proposed zero-sequence voltage injection, up to 100% more faulty modules can be compensated in an arm by employing the same hardware. In addition, module power imbalances are nearly eliminated by utilizing a fundamental frequency zero-sequence voltage. A dominant 3rd harmonic zero-sequence voltage injection in combination with the 5th, 7th and several higher order harmonics with adaptive (small) amplitudes minimize the required arm voltages at steady-state. For nominal operation or symmetrical faults, the proposed technique is equivalent to the well known Min-Max voltage injection, which already reduces the peak arm voltage by 13.4% compared to a constant star point potential. A statistical analysis proves, that the expected number of tolerable faulty modules of the 1MW SST increases by 12% without the need for additional hardware."}],"status":"public","type":"conference","publication":"23rd European Conference on Power Electronics and Applications (EPE'21 ECCE Europe)","keyword":["Solid-State Transformer","Zero sequence voltage","Fault handling strategy","Power balance control technique","Three-phase system"],"language":[{"iso":"eng"}],"_id":"29938","user_id":"34289","department":[{"_id":"52"}],"year":"2021","citation":{"apa":"Unruh, R., Lange, J., Schafmeister, F., &#38; Böcker, J. (2021). Adaptive Zero-Sequence Voltage Injection for Modular Solid-State Transformer to Compensate for Asymmetrical Fault Conditions. <i>23rd European Conference on Power Electronics and Applications (EPE’21 ECCE Europe)</i>. 23rd European Conference on Power Electronics and Applications (EPE’21 ECCE Europe), Ghent, Belgium. <a href=\"https://doi.org/10.23919/EPE21ECCEEurope50061.2021.9570542\">https://doi.org/10.23919/EPE21ECCEEurope50061.2021.9570542</a>","mla":"Unruh, Roland, et al. “Adaptive Zero-Sequence Voltage Injection for Modular Solid-State Transformer to Compensate for Asymmetrical Fault Conditions.” <i>23rd European Conference on Power Electronics and Applications (EPE’21 ECCE Europe)</i>, IEEE, 2021, doi:<a href=\"https://doi.org/10.23919/EPE21ECCEEurope50061.2021.9570542\">https://doi.org/10.23919/EPE21ECCEEurope50061.2021.9570542</a>.","short":"R. Unruh, J. Lange, F. Schafmeister, J. Böcker, in: 23rd European Conference on Power Electronics and Applications (EPE’21 ECCE Europe), IEEE, 2021.","bibtex":"@inproceedings{Unruh_Lange_Schafmeister_Böcker_2021, title={Adaptive Zero-Sequence Voltage Injection for Modular Solid-State Transformer to Compensate for Asymmetrical Fault Conditions}, DOI={<a href=\"https://doi.org/10.23919/EPE21ECCEEurope50061.2021.9570542\">https://doi.org/10.23919/EPE21ECCEEurope50061.2021.9570542</a>}, booktitle={23rd European Conference on Power Electronics and Applications (EPE’21 ECCE Europe)}, publisher={IEEE}, author={Unruh, Roland and Lange, Jarren and Schafmeister, Frank and Böcker, Joachim}, year={2021} }","ama":"Unruh R, Lange J, Schafmeister F, Böcker J. Adaptive Zero-Sequence Voltage Injection for Modular Solid-State Transformer to Compensate for Asymmetrical Fault Conditions. In: <i>23rd European Conference on Power Electronics and Applications (EPE’21 ECCE Europe)</i>. IEEE; 2021. doi:<a href=\"https://doi.org/10.23919/EPE21ECCEEurope50061.2021.9570542\">https://doi.org/10.23919/EPE21ECCEEurope50061.2021.9570542</a>","ieee":"R. Unruh, J. Lange, F. Schafmeister, and J. Böcker, “Adaptive Zero-Sequence Voltage Injection for Modular Solid-State Transformer to Compensate for Asymmetrical Fault Conditions,” presented at the 23rd European Conference on Power Electronics and Applications (EPE’21 ECCE Europe), Ghent, Belgium, 2021, doi: <a href=\"https://doi.org/10.23919/EPE21ECCEEurope50061.2021.9570542\">https://doi.org/10.23919/EPE21ECCEEurope50061.2021.9570542</a>.","chicago":"Unruh, Roland, Jarren Lange, Frank Schafmeister, and Joachim Böcker. “Adaptive Zero-Sequence Voltage Injection for Modular Solid-State Transformer to Compensate for Asymmetrical Fault Conditions.” In <i>23rd European Conference on Power Electronics and Applications (EPE’21 ECCE Europe)</i>. IEEE, 2021. <a href=\"https://doi.org/10.23919/EPE21ECCEEurope50061.2021.9570542\">https://doi.org/10.23919/EPE21ECCEEurope50061.2021.9570542</a>."},"publication_status":"published","publication_identifier":{"isbn":["978-9-0758-1537-5"]},"title":"Adaptive Zero-Sequence Voltage Injection for Modular Solid-State Transformer to Compensate for Asymmetrical Fault Conditions","main_file_link":[{"url":"https://ieeexplore.ieee.org/abstract/document/9570542"}],"doi":"https://doi.org/10.23919/EPE21ECCEEurope50061.2021.9570542","conference":{"start_date":"2021-09-06","name":"23rd European Conference on Power Electronics and Applications (EPE'21 ECCE Europe)","location":"Ghent, Belgium","end_date":"2021-09-10"},"publisher":"IEEE","date_updated":"2022-09-09T12:01:42Z","author":[{"first_name":"Roland","id":"34289","full_name":"Unruh, Roland","last_name":"Unruh"},{"first_name":"Jarren","id":"78801","full_name":"Lange, Jarren","last_name":"Lange"},{"first_name":"Frank","id":"71291","full_name":"Schafmeister, Frank","last_name":"Schafmeister"},{"first_name":"Joachim","orcid":"0000-0002-8480-7295","last_name":"Böcker","full_name":"Böcker, Joachim","id":"66"}],"date_created":"2022-02-21T16:31:34Z"}]