TY - GEN
T1 - Modular Multilevel Converter with Stack-Parallel Cascaded H-Bridge Energy Storage Branch
AU - Blatsi, Zoe
AU - Neira, Sebastian
AU - Judge, Paul D.
AU - Merlin, Michael M.C.
AU - Finney, Stephen J.
N1 - Publisher Copyright:
© 2021 IEEE.
PY - 2021/12/23
Y1 - 2021/12/23
N2 - Utility-scale Energy Storage Systems (ESS) provide ancillary services such as primary frequency regulation and load management. The integration of ESS in Modular Multilevel Converters (MMC) has been proposed in recent years, taking advantage of the modularity, reliability, and high efficiency of the topology. This paper discusses the design and control of a modified MMC topology with integrated partially-rated Energy Storage Cascaded H-Bridge branches in parallel with a portion of the MMC stacks, enabling the power flow between the ES branches and the ac or dc sides. The state-space dynamics of the system are detailed, with emphasis to the controller and balancing algorithms that arc required to achieve energy balancing between the split substacks. Power flow scenarios featuring 0.05pu ES contribution are presented, and a power step change is demonstrated. The energy deviation of the stacks and the overall impact on converter ratings are also discussed, mostly in the light of upgrades needed to increase the power capability.
AB - Utility-scale Energy Storage Systems (ESS) provide ancillary services such as primary frequency regulation and load management. The integration of ESS in Modular Multilevel Converters (MMC) has been proposed in recent years, taking advantage of the modularity, reliability, and high efficiency of the topology. This paper discusses the design and control of a modified MMC topology with integrated partially-rated Energy Storage Cascaded H-Bridge branches in parallel with a portion of the MMC stacks, enabling the power flow between the ES branches and the ac or dc sides. The state-space dynamics of the system are detailed, with emphasis to the controller and balancing algorithms that arc required to achieve energy balancing between the split substacks. Power flow scenarios featuring 0.05pu ES contribution are presented, and a power step change is demonstrated. The energy deviation of the stacks and the overall impact on converter ratings are also discussed, mostly in the light of upgrades needed to increase the power capability.
KW - Cascaded H-Bridge (CHB)
KW - Energy Storage (ES)
KW - High Voltage Direct Current (HVDC)
KW - Modular Multilevel Converter (MMC)
UR - http://www.scopus.com/inward/record.url?scp=85124192027&partnerID=8YFLogxK
U2 - 10.1109/COMPEL52922.2021.9645975
DO - 10.1109/COMPEL52922.2021.9645975
M3 - Conference contribution
AN - SCOPUS:85124192027
T3 - 2021 IEEE 22nd Workshop on Control and Modelling of Power Electronics, COMPEL 2021
BT - 2021 IEEE 22nd Workshop on Control and Modelling of Power Electronics, COMPEL 2021
PB - Institute of Electrical and Electronics Engineers
T2 - 22nd IEEE Workshop on Control and Modelling of Power Electronics, COMPEL 2021
Y2 - 2 November 2021 through 5 November 2021
ER -