Abstract
The increasing penetration of renewable energy sources into the grid has brought upon the need for synthetic inertia. This is to be meted out by the corresponding power electronic interfaces integrating these Distributed Energy Sources into the grid. In particular, a novel interface scheme using back-to-back MMCs to integrate wind turbines to the collection grid at voltages of 34.5kV has been shown to possess substantial potential for virtual inertia. The large stored potential energy in the virtual dc link between the MMCs is used to emulate the characteristics of a synchronous generator in case of step load changes. Inertial parameters of the back-to-back MMC has been derived enabling comparison with a synchronous generator connected to the grid. A control scheme to provide additional power to emulate the inertial characteristics of a synchronous generator has been developed. The corresponding over-ratings of currents and voltages to support this function have been quantitatively described. Frequency response characteristics due to step load changes in a weak grid has been considerably improved with the proposed interface scheme as verified by simulation results.
Original language | English (US) |
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Title of host publication | 2018 IEEE Energy Conversion Congress and Exposition, ECCE 2018 |
Publisher | Institute of Electrical and Electronics Engineers Inc. |
Pages | 6682-6687 |
Number of pages | 6 |
ISBN (Electronic) | 9781479973118 |
DOIs | |
State | Published - Dec 3 2018 |
Event | 10th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2018 - Portland, United States Duration: Sep 23 2018 → Sep 27 2018 |
Publication series
Name | 2018 IEEE Energy Conversion Congress and Exposition, ECCE 2018 |
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Other
Other | 10th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2018 |
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Country/Territory | United States |
City | Portland |
Period | 9/23/18 → 9/27/18 |
Bibliographical note
Publisher Copyright:© 2018 IEEE.
Keywords
- Back-to-Back MMCs
- Grid Integration
- Power Electronic Transformer
- Virtual DC link
- Virtual Inertia