This article proposes the partially signed binary voltage control (PSBVC) method for a hybrid modular multilevel converter (MMC) (HMMC), which has a mixture of half-bridge submodules (SMs) (HB-SMs) and full-bridge SMs (FB-SMs). With the proposed PSBVC method, the HMMC can generate a large number of voltage levels with much fewer SMs than the MMC and enhanced MMC (EMMC) by having different voltages for each FB-SM. That is, all HB-SMs have the same voltage and their sum in an arm is the same as the dc-link voltage. On the contrary, the voltages of FB-SM are sequentially decreased by half from HB-SM voltage. As the voltage level becomes more sophisticated, the circulating current decreases effectively because the voltages of HB-SMs are tightly regulated. As the result, the HMMC with the proposed PSBVC method is superior in not only harmonic performance but also circulating current. To verify the effectiveness of the HMMC with the proposed PSBVC method, its controller is firstly designed by the electromagnetic transients program (EMTP). Then, it is experimentally verified with the hardware prototype of HMMC. Finally, the main advantages of HMMC with the proposed PSBVC method are emphasized by comparing it with MMC and EMMC in detail.
|Number of pages||12|
|Journal||IEEE Journal of Emerging and Selected Topics in Power Electronics|
|Publication status||Published - 2021 Aug|
Bibliographical noteFunding Information:
Manuscript received March 26, 2020; revised June 8, 2020, August 3, 2020, and October 5, 2020; accepted November 13, 2020. Date of publication December 1, 2020; date of current version July 30, 2021. This work was supported in part by the National Research Foundation (NRF) Grant funded by the Ministry of Science and ICT (MSIT), Korea Government under Grant 2020R1A3B2079407 and in part by Korea Electric Power Corporation under Grant R19XO01-10. Recommended for publication by Associate Editor Hanh-Phuc Le. (Corresponding authors: Soo Hyoung Lee; Jung-Wook Park.) HyunWoo Lee and Jung-Wook Park are with the School of Electrical and Electronic Engineering, Yonsei University, Seoul 03722, South Korea (e-mail: firstname.lastname@example.org; email@example.com).
© 2013 IEEE.
All Science Journal Classification (ASJC) codes
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering