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Impedance Modeling and Analysis of Series-Connected Modular Multilevel Converter (MMC) and its Comparative Study With Conventional MMC for HVDC Applications.
- Source :
-
IEEE Transactions on Power Delivery . Aug2022, Vol. 37 Issue 4, p3270-3281. 12p. - Publication Year :
- 2022
-
Abstract
- Similar to the conventional three-phase parallel-connected MMC (PC-MMC), the three-phase series-connected MMC (SC-MMC) is a strong potential solution for high-voltage direct current (HVDC) applications. The study of SC-MMC focuses on the control strategy, neglecting its small-signal dynamics, not to mention its stability when interacting with the AC grid. Work on small-signal modeling of MMC is limited to parallel-connected configurations. SC-MMC differs from PC-MMC in structure and harmonic content; hence, it is necessary to establish an accurate model of SC-MMC according to its own characteristics. This paper introduces the circuit and control of SC-MMC and compares it with PC-MMC. Multi-harmonic linearization is used to establish the AC impedance model of SC-MMC over the whole control system, including the third harmonic suppression controller. We take a PC-MMC station of the Wudongde HVDC project as a benchmark to explore the potential application of SC-MMC when constructing new HVDC stations to extract power from an existing DC transmission corridor. The strengths and weaknesses of SC-MMC in HVDC applications are discussed, and it is compared to PC-MMC with regard to the impedance characteristic. [ABSTRACT FROM AUTHOR]
- Subjects :
- *PHASE-locked loops
*COMPARATIVE studies
*HARMONIC analysis (Mathematics)
Subjects
Details
- Language :
- English
- ISSN :
- 08858977
- Volume :
- 37
- Issue :
- 4
- Database :
- Academic Search Index
- Journal :
- IEEE Transactions on Power Delivery
- Publication Type :
- Academic Journal
- Accession number :
- 158186415
- Full Text :
- https://doi.org/10.1109/TPWRD.2021.3125699