TY  - EJOU
AU  - Mei, Mingwan 
AU  - Wang, Ping 
AU  - Che, Yanbo 
AU  - Lv, Zihan 
AU  - Khanand, Zmarrak Wali 
AU  - Xing, Chao 

TI  - A Dual Arm Complementary Hybrid Modulation Strategy Combining NL-SPWM for MMC Applications
T2  - Energy Engineering

PY  - 2022
VL  - 119
IS  - 2
SN  - 1546-0118

AB  - <p>In the medium voltage direct current (MVDC) transmission system, a small number of MMC sub modules will reduce the power quality. In this paper, based on the research background of Photovoltaic Medium Voltage Direct Current (PV-MVDC) system, a Hybrid Modulation Strategy based on the Decoupled Double Synchronous Reference Frame (DDSRF) control strategy is proposed. The dual arm complementary hybrid modulation combining nearest-level-SPWM (NL-SPWM) can keep the number of SMs in the ON state constant. Then, the corresponding voltage sharing control algorithm of sub module (SM) is introduced. Through theoretical calculation, the modulation strategy can be found to stabilize the DC voltage and reduce the harmonic content. A 32-level MMC system has been developed to verity that the proposed hybrid modulation strategy and its SM voltage sharing algorithm have the advantages of restraining circulating current and maintaining capacitor voltage balance.</p>

KW  - Modular multilevel converter; modulation strategy; dual arm complementary; nearest-level-modulation; harmonics improvement

DO  - 10.32604/ee.2022.016585