TY - GEN
T1 - Low Frequency Ripple-Free Finite Valued Electronic Capacitor
AU - Strajnikov, Pavel
AU - Peretz, Mor M.
AU - Kuperman, Alon
N1 - Funding Information: ACKNOWLEDGMENT This work was funded in part by the Ministry of Energy, Infrastructures and Water of Israel. Publisher Copyright: © 2020 IEEE.
PY - 2020/11/9
Y1 - 2020/11/9
N2 - Electronic Capacitors (ECs) are two-terminal "plug-and-play"active devices, typically utilized to replace bulk DC link electrolytic capacitance in grid-connected power conversion systems. An EC consists of a bidirectional power converter, terminated by small auxiliary capacitor, and a feedback control system, forcing the system to emulate a large finite capacitance at the output terminals, based on local measurements only. Typically, DC link voltage regulation is carried out by the outer loop controller of grid-connected converter, tuned to a specific value of DC-link capacitor. Therefore, accurate emulation of this specific capacitance by an EC is essential to preserve prescribed DC link voltage dynamics, which directly influences grid-side current quality. However, due to finite capacitance employed, steady-state DC link ripple is always present in grid-connected power systems. The paper proposes a modification of EC control structure, allowing to achieve near-zero DC-link ripple (i.e. emulating infinite capacitor in steady-state) while maintaining accurate transient dynamics of a specific finite-valued capacitance.
AB - Electronic Capacitors (ECs) are two-terminal "plug-and-play"active devices, typically utilized to replace bulk DC link electrolytic capacitance in grid-connected power conversion systems. An EC consists of a bidirectional power converter, terminated by small auxiliary capacitor, and a feedback control system, forcing the system to emulate a large finite capacitance at the output terminals, based on local measurements only. Typically, DC link voltage regulation is carried out by the outer loop controller of grid-connected converter, tuned to a specific value of DC-link capacitor. Therefore, accurate emulation of this specific capacitance by an EC is essential to preserve prescribed DC link voltage dynamics, which directly influences grid-side current quality. However, due to finite capacitance employed, steady-state DC link ripple is always present in grid-connected power systems. The paper proposes a modification of EC control structure, allowing to achieve near-zero DC-link ripple (i.e. emulating infinite capacitor in steady-state) while maintaining accurate transient dynamics of a specific finite-valued capacitance.
KW - DC link
KW - capacitance
KW - control systems
UR - http://www.scopus.com/inward/record.url?scp=85098596914&partnerID=8YFLogxK
U2 - https://doi.org/10.1109/COMPEL49091.2020.9265851
DO - https://doi.org/10.1109/COMPEL49091.2020.9265851
M3 - Conference contribution
T3 - 2020 IEEE 21st Workshop on Control and Modeling for Power Electronics, COMPEL 2020
BT - IEEE 21st Workshop on Control and Modeling for Power Electronics, COMPEL 2020
T2 - 21st IEEE Workshop on Control and Modeling for Power Electronics, COMPEL 2020
Y2 - 9 November 2020 through 12 November 2020
ER -