# Modular Combined DC-DC Autotransformer for Offshore Wind Power Integration with DC Collection
## 6 Conclusions
_IET Renew. Power Gener._**2016**, \(5\), 651-660. [CrossRef]
* [10] [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON] Modular Isolated LLC DC/DC Conversion System for Offshore Wind Farm Collection and Integration. _IEEE J. Emerg. Sel. Top. Power Electron._**2021**, \(9\), 6713-6725. [CrossRef]
* [11] [PERSON]; [PERSON]; [PERSON]; [PERSON] A Modular Multiple DC Transformer Based DC Transmission System for PMSG Based Offshore Wind Farm Integration. _IEEE Access_**2020**, \(8\), 15736-15746. [CrossRef]
* [12] [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON] Overview of DC-DC Converters Dedicated to HVDC Grids. _IEEE Trans. Power Deliv._**2019**, _34_, 119-128. * [13] [PERSON]; [PERSON]; [PERSON] Multilevel modular DC/DC power converter for high-voltage DC-connected offshore wind energy applications. _IEEE Trans. Ind. Electron._**2015**, \(5\), 2879-2890. [CrossRef]
* [14] [PERSON] DC-DC autotransformer with bidirectional DC fault isolating capability. _IEEE Trans. Power Electron._**2015**, _31_, 5400-5410. [CrossRef]
* [15] [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON] Input-independent and output-series connected modular DC-DC converter with intermodule power balancing units for MVdc Integration of distributed PV. _IEEE Trans. Power Electron._**2020**, _35_, 1622-1636. [CrossRef]
* [16] [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON] Modular DC-DC auto-transformer: Topology, operation, and system design. _IET Power Electron._**2021**, _14_, 2289-2302. [CrossRef]
* [17] [PERSON]; [PERSON]; [PERSON] _Voltage Source Converter Based HVDC Power Transmission Systems_, 2 nd ed. ; China Machine Press: Beijing, China, 2013. * [18] [PERSON] _Voltage Source Converter Based HVDC Power Transmission Systems_, 2 nd ed. ; China Machine Press: Beijing, China, 2016. * [19] [PERSON]; [PERSON]; [PERSON] Selection methods of main circuit parameters for modular multilevel converters. _IET Renew. Power Gener._**2016**, _10_, 788-797. [CrossRef]
* [20] [PERSON]; [PERSON]; [PERSON]; [PERSON] Voltage balancing control of isolated modular multilevel dc-dc converter for use in dc grids with zero voltage switching. _IET Power Electron._**2016**, \(9\), 270-280. [CrossRef]
* [21] [PERSON]; [PERSON]; [PERSON] Reduced switching-frequency modulation and circulation current suppression for modular multilevel converters. _IEEE Trans. Power Deliv._**2011**, _26_, 2009-2017. * [22] [PERSON]; [PERSON]; [PERSON]; [PERSON] Enhanced Independent Pole Control of Hybrid MMC-HVDC System. _IEEE Trans. Power Deliv._**2018**, _33_, 861-872. [CrossRef]
* [23] [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON] Wide-Area Damping Controller for Power System Interarea Oscillations: A Networked Predictive Control Approach. _IEEE Trans. Control Syst. Technol._**2015**, _23_, 27-36. [CrossRef]
* [24] [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON] High-frequency operation of a DC/AC/DC system for HVDC applications. _IEEE Trans. Power Electron._**2014**, _29_, 4107-4115. [CrossRef]
* [25] [PERSON]; [PERSON]; [PERSON] Study on the protection strategies of HVDC grid for overhead line application. _CSEE_**2016**, _36_, 3726-3734. * [26] [PERSON]; [PERSON]; [PERSON] Enhanced Ride-Through Capability Under Rectifier-Side AC Fault for Series LCC-MMC Hybrid HVDC System. _IEEE Access_**2021**, \(9\), 153050-153057. [CrossRef]
* [27] [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON] Hybrid modular multilevel converter based multi-terminal DC/DC converter with minimized full-bridge submodules ratio considering DC fault isolation. _IET Renew. Power Gener._**2016**, _10_, 1587-1596. [CrossRef]
* [28] [PERSON]; [PERSON]; [PERSON] A Comparison of VSC-HVDC with Low Frequency AC for Offshore Wind Farm Design and Interconnection. _Energy Procedia_**2015**, _80_, 185-192. [CrossRef]
* [29] [PERSON]; [PERSON]; [PERSON]; [PERSON] Fast voltage-balancing control and fast numerical simulation model for the modular multilevel converter. _IEEE Trans. Power Deliv._**2015**, _30_, 220-228. [CrossRef]
* [30] [PERSON] _HVDC Engineering Technology_, 2 nd ed.