Sören Hedtke

Last Name

Hedtke

First Name

Sören

ORCID

0000-0002-7091-5594

Organisational unit

01109 - Lehre Bau, Umwelt und Geomatik

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Publications1 - 10 of 19

Economic benefit analysis of retrofitting a fixed-speed pumped storage hydropower plant with an adjustable-speed machine
Vargas-Serrano, Andres; Hamann, Andrew; Hedtke, Sören; et al. (2017)
2017 IEEE Manchester PowerTech
For pumped storage hydropower plants with fixed-speed electrical machines, turbines typically operate between 70 and 100 percent of rated power whereas pumps usually run at constant load. If the fixed-speed machine is replaced with an adjustable-speed machine, the operating range of the pump increases, thereby increasing flexibility and enabling the provision of ancillary services in pump mode. This paper estimates the economic benefits of converting an existing fixed-speed pumped storage hydropower plant to adjustable speed. We consider the test case of the Grimsel 2 pumped storage hydropower plant, located in Switzerland. We implement a mixed-integer linear program to optimize operations at Grimsel 2 considering the structure of Swiss energy and ancillary service markets. Our results show that upgrading a fixed-speed plant to adjustable speed could increase total revenue up to 58 percent.
Audible noise of hybrid AC/DC overhead lines: Comparison of different prediction methods and conductor arrangements
Hedtke, Sören; Zaffanella, Luciano; Pfeiffer, Martin D.; et al. (2015)
HVAC Corona Current Characteristics and Audible Noise during Rain
Xu, Pengfei; Hedtke, Sören; Zhang, Bo; et al. (2021)
IEEE Transactions on Power Delivery
Benefit Analysis of a Hybrid HVAC/HVDC Transmission Line: a Swiss Case Study
Stanojev, Ognjen; Garrison, Jared; Hedtke, Sören; et al. (2019)
2019 IEEE Milan PowerTech
Explaining the impact of conductor surface type on wet weather HVDC corona characteristics
Schultz, Tim; Pfeiffer, Martin D.; Hedtke, Sören; et al. (2016)
Journal of Electrostatics
Corona Current Coupling in Bipolar HVDC and Hybrid HVAC/HVDC Overhead Lines
Pfeiffer, Martin D.; Hedtke, Sören; Franck, Christian (2018)
IEEE Transactions on Power Delivery
This publication investigates the corona generated ion flow environment in bipolar HVDC and hybrid AC/DC transmission systems. The emphasis is on the DC ion current magnitude in the conductors. In DC conductors this constitutes the corona power loss, while in AC conductors this quantity is primarily of concern due to the risk of transformer saturation. Existing prediction methods are compared to full-scale test data from the literature and new laboratory measurements. It is shown that the bipolar HVDC and hybrid AC/DC ion flow phenomena are similar in the sense that mutual space-charge related surface field enhancements are a dominant factor in the determination of the total conductor ion currents. Furthermore, in a hybrid AC/DC environment, the existence of a net DC ion current stemming from the AC conductor is verified and explained. Limitations of existing prediction methods are demonstrated and recommendations for future work is given.
Effect of electrostatic induction and space charges on the audible corona noise of hybrid AC/DC transmission lines
Hedtke, Sören; Pfeiffer, Martin D.; Gaillard, Antoine; et al. (2016)
Setup of an outdoor hybrid AC/DC test line for corona measurements
Hedtke, Sören; Pfeiffer, Martin D.; Gobeli, Mario; et al. (2018)
ETG-Fachbericht ~ Tagungsband, Beiträge der Fachtagung VDE-Hochspannungstechnik 2018, 22.-24. November 2018, Berlin. 2018
Hybrid AC&/DC overhead lines in Switzerland
Hedtke, Sören; Pfeiffer, Martin D.; Franck, Christian; et al. (2015)
Corona discharge pulse pattern and audible noise on hybrid AC/DC transmission lines under electric field bias, ripple and ion coupling
Hedtke, Sören; Pfeiffer, Martin D.; Franck, Christian (2019)
Journal of Electrostatics

Publications1 - 10 of 19

Sören Hedtke

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