TY - JOUR
T1 - State observer based capacitor-voltage-balancing method for modular multilevel converters without arm-current sensors
AU - Hu, Pengfei
AU - Teodorescu, Remus
AU - Guerrero, Josep M.
PY - 2019/12
Y1 - 2019/12
N2 - This paper proposes a state observer (SO) based capacitor-voltage-balancing method for modular multilevel converters (MMCs) without arm-current sensors. Without the knowledge of the actual arm-current signals, this method can balance capacitor voltages while reducing the sampling signals, compacting the control system and saving the overall cost. In this paper, the arm-current value estimated by an SO, instead of the measured one, is employed to determine which sub-modules (SMs) should be inserted or bypassed. Furthermore, the design procedure of the proposed SO is presented. In addition, a medium voltage MMC (20 kV, 25 MW) simulation model using Matlab/Simulink is constructed to verify the proposed method. Finally, the proposed method is also validated by experimental results based on a scaled-down MMC prototype.
AB - This paper proposes a state observer (SO) based capacitor-voltage-balancing method for modular multilevel converters (MMCs) without arm-current sensors. Without the knowledge of the actual arm-current signals, this method can balance capacitor voltages while reducing the sampling signals, compacting the control system and saving the overall cost. In this paper, the arm-current value estimated by an SO, instead of the measured one, is employed to determine which sub-modules (SMs) should be inserted or bypassed. Furthermore, the design procedure of the proposed SO is presented. In addition, a medium voltage MMC (20 kV, 25 MW) simulation model using Matlab/Simulink is constructed to verify the proposed method. Finally, the proposed method is also validated by experimental results based on a scaled-down MMC prototype.
KW - Capacitor voltage balancing
KW - Modular Multilevel Converter (MMC)
KW - Sensorless
KW - Sorting and selection
KW - State observer
UR - http://www.scopus.com/inward/record.url?scp=85065875417&partnerID=8YFLogxK
U2 - 10.1016/j.ijepes.2019.05.025
DO - 10.1016/j.ijepes.2019.05.025
M3 - Journal article
AN - SCOPUS:85065875417
SN - 0142-0615
VL - 113
SP - 188
EP - 196
JO - International Journal of Electrical Power and Energy Systems
JF - International Journal of Electrical Power and Energy Systems
ER -