Abstract
Non-isolated DC/DC converter based on modular multilevel converter (MMC) technology is expected to play an important role in future DC transmission grids. This paper presents a phasor analytical model for this new family of converters which is suitable for a range of studies like DC grid power flow or DC/DC parametric design. The 30th-order phasor model is derived in 3 coordinate frames: zero sequence (DC), fundamental frequency (($\pmb{dq}$)), and double frequency ($d2q2$). The second-harmonic current suppression control is included as an option. Additionally, an estimation of the required control signals is presented, and a closed-loop model is developed which facilitates direct calculation of all variables and fast parametric studies. The accuracy of the proposed models is verified against a detailed PSCAD model for a wide range of parameters. The studies illustrate the importance of the second-harmonic components on the model accuracy. Finally, the impact of the converter parameters on the performance is studied, and a basic eigen-value stability analysis is given.
| Original language | English |
|---|---|
| Pages (from-to) | 611-621 |
| Number of pages | 11 |
| Journal | Journal of Modern Power Systems and Clean Energy |
| Volume | 11 |
| Issue number | 2 |
| Early online date | 16 Jun 2022 |
| DOIs | |
| Publication status | Published - 1 Mar 2023 |
Keywords
- High-voltage direct current (HVDC) transmission
- modular multilevel converter (MMC)
- non-isolated DC/DC converter
- phasor modelling
Access to Document
- Far_etJovic_JMPSCE_Phasor_Analytical_Model_VOR
This article is distributed under the terms of the Creative Commons Attribu‐tion 4.0 International License (http://creativecommons.org/licenses/by/4.0/)