Open AccessSeries‐connected single‐phase MMC for multi‐phase PMSG with DC grid
Author(s) -
Rong Fei,
Sun Wenlong,
Zhou Shijia,
Huang Shoudao
Publication year - 2019
Publication title -
iet power electronics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.637
H-Index - 77
eISSN - 1755-4543
pISSN - 1755-4535
DOI - 10.1049/iet-pel.2018.5693
Subject(s) - pulse width modulation , maximum power point tracking , harmonics , topology (electrical circuits) , control theory (sociology) , transformer , three phase , converters , capacitor , voltage , computer science , electrical engineering , electronic engineering , engineering , inverter , control (management) , artificial intelligence
A topology for six series‐connected single‐phase modular multilevel converters (MMCs) for multi‐phase permanent‐magnet synchronous generator (PMSG) wind power systems is proposed to deliver wind power to a medium‐voltage DC (MVDC) grid. The AC side of each MMC is connected to one phase of the multi‐phase PMSG. The DC sides of the MMCs are connected in series to obtain a medium‐level DC voltage. The maximum power point tracking (MPPT) and grid‐connected control methods are discussed in detail. The high‐frequency voltage injection circuit is designed to suppress the voltage fluctuations of the sub‐module capacitor. Further, the nearest‐level and pulse width modulation (NL‐PWM) based on the sampling value is proposed to suppress the harmonics of the stator current. The proposed topology exhibits low costs, a high efficiency, and a high boost ratio without an additional step‐up DC/DC converter or transformer. The constructed simulation model verifies the validity of the proposed topology. Moreover, the experimental results are assessed with RT‐Lab.