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Internal Model-Based Active Damping Strategy for a Back-to-Back Modular Multilevel Converter System for Advanced Grid Support

Conference ·

The proposed work focuses on the possibility of achieving the reduction in the size of the interfacing filter for the grid connection for a back-to-back modular multilevel converter system with the use of third order LCL filters. To achieve the same attenuation, it is possible to reduce the size of the interfacing filters by the usage of third-order filters; however, this kind of filtering comes with the limitation of having sustained oscillations caused by lack of damping especially during transient changes. Therefore, this work proposes, a methodology based on the principle of internal model to nullify these unwanted oscillations. The third-order system is modeled inside the microcontroller with the damping enabled. The error between the output from the model and the actual output are compared and the error is used to accomplish the active damping strategy. The proposed architecture is verified via computer simulations based on the MATLAB/Simulink domain. Various case study results and discussions are presented in this paper.

Research Organization:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Energy Efficiency Office. Advanced Manufacturing Office
DOE Contract Number:
AC36-08GO28308
OSTI ID:
1888036
Report Number(s):
NREL/CP-5D00-84008; MainId:84781; UUID:f4266cff-5f18-4bc2-a4ef-bd0c4eb6bbd2; MainAdminID:65491
Resource Relation:
Conference: Presented at the 2022 IEEE 31st International Symposium on Industrial Electronics (ISIE), 1-3 June 2022, Anchorage, Alaska; Related Information: 82439
Country of Publication:
United States
Language:
English

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