Details
| Original language | English |
|---|---|
| Pages (from-to) | 2334-2350 |
| Number of pages | 17 |
| Journal | IEEE Transactions on Power Electronics |
| Volume | 39 |
| Issue number | 2 |
| Early online date | 1 Nov 2023 |
| Publication status | Published - Feb 2024 |
Abstract
For the internal control of MMC topologies, degrees of freedom (DOF) that can influence both the transient and steady-state performance are used. Several operation modes, each with a specific selection of DOF, can be used to reduce either the branch energy variation, as an indicator of the required module capacitance, or the branch current RMS value, as an indicator of the branch losses. In this article, an operating-point-optimized operation mode based on an analytical model is presented, which uses a weighting function to find a tradeoff between branch energy variations and branch losses for each operating point, depending on the characteristics of the converter and connected systems. This generalized approach is valid for M3C, M2C, and b2b-M2C. The operating-point-optimized operation mode is presented for application in a low-frequency ac transmission system connecting an offshore wind farm to the onshore grid, whereby M3C or b2b-M2C is used as an ac to ac converter station. Using the novel operation mode, the MMC topologies can be optimally dimensioned and compared with each other at each operating point. The analytical approach is validated with a simulation model of a 320MW low-frequency ac transmission system and additionally tested on a low-voltage test bench.
Keywords
- AC-to-AC converter, low-frequency ac transmission, modular matrix converter, modular multilevel converter (M2C), offshore wind power integration
ASJC Scopus subject areas
- Engineering(all)
- Electrical and Electronic Engineering
Cite this
- Standard
- Harvard
- Apa
- Vancouver
- BibTeX
- RIS
In: IEEE Transactions on Power Electronics, Vol. 39, No. 2, 02.2024, p. 2334-2350.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Operating-Point-Optimized Control Strategy for Modular Multilevel Converters in Low-Frequency AC Transmission Systems
AU - Himker, Rebecca
AU - Mertens, Axel
N1 - Funding Information: This work was supported by the German Research Foundation (DFG) - Project 254417319.
PY - 2024/2
Y1 - 2024/2
N2 - For the internal control of MMC topologies, degrees of freedom (DOF) that can influence both the transient and steady-state performance are used. Several operation modes, each with a specific selection of DOF, can be used to reduce either the branch energy variation, as an indicator of the required module capacitance, or the branch current RMS value, as an indicator of the branch losses. In this article, an operating-point-optimized operation mode based on an analytical model is presented, which uses a weighting function to find a tradeoff between branch energy variations and branch losses for each operating point, depending on the characteristics of the converter and connected systems. This generalized approach is valid for M3C, M2C, and b2b-M2C. The operating-point-optimized operation mode is presented for application in a low-frequency ac transmission system connecting an offshore wind farm to the onshore grid, whereby M3C or b2b-M2C is used as an ac to ac converter station. Using the novel operation mode, the MMC topologies can be optimally dimensioned and compared with each other at each operating point. The analytical approach is validated with a simulation model of a 320MW low-frequency ac transmission system and additionally tested on a low-voltage test bench.
AB - For the internal control of MMC topologies, degrees of freedom (DOF) that can influence both the transient and steady-state performance are used. Several operation modes, each with a specific selection of DOF, can be used to reduce either the branch energy variation, as an indicator of the required module capacitance, or the branch current RMS value, as an indicator of the branch losses. In this article, an operating-point-optimized operation mode based on an analytical model is presented, which uses a weighting function to find a tradeoff between branch energy variations and branch losses for each operating point, depending on the characteristics of the converter and connected systems. This generalized approach is valid for M3C, M2C, and b2b-M2C. The operating-point-optimized operation mode is presented for application in a low-frequency ac transmission system connecting an offshore wind farm to the onshore grid, whereby M3C or b2b-M2C is used as an ac to ac converter station. Using the novel operation mode, the MMC topologies can be optimally dimensioned and compared with each other at each operating point. The analytical approach is validated with a simulation model of a 320MW low-frequency ac transmission system and additionally tested on a low-voltage test bench.
KW - AC-to-AC converter
KW - low-frequency ac transmission
KW - modular matrix converter
KW - modular multilevel converter (M2C)
KW - offshore wind power integration
UR - http://www.scopus.com/inward/record.url?scp=85181139842&partnerID=8YFLogxK
U2 - 10.1109/TPEL.2023.3329373
DO - 10.1109/TPEL.2023.3329373
M3 - Article
AN - SCOPUS:85181139842
VL - 39
SP - 2334
EP - 2350
JO - IEEE Transactions on Power Electronics
JF - IEEE Transactions on Power Electronics
SN - 0885-8993
IS - 2
ER -