Industrial single-phase rectifiers typically require a bulky passive energy storage device to both handle the double-line frequency power ripple and to maintain operation during AC line drops out, affecting power density and lifetime. A possible approach allowing a strong reduction of the volume of the required storage device is the adoption of active energy storage systems (ARES). This is normally implemented through a bi-directional converter interfacing the PFC output bus and an auxiliary storage capacitor, allowing a wider voltage span across this last and a wider exploitation of energy flow needed to compensate for the ripple power/voltage. Among possible ARES topologies, the buck (from the bus) type is popular for its low component count and voltage stress, but it has poor hold-up time capability due to the lack of the buck/boost capabilities from the storage. In this paper, a buck/boost ARES circuit is proposed, with extended hold-up time capability for high power dense rectifiers. Dual voltage loop regulation method based on a 2-pole 2-zero and a resonant controller is considered for the buck/boost mode from the bus (i.e., compensation of the bus voltage ripple), whilst a 3-pole 2-zero controller allows to sustain the PFC bus voltage during AC line drops, i.e. buck/boost mode from the storage. The proposed ARES solution has been fully validated through simulations. A 2 kW prototype has been developed, based on SiC power MOSFETs and digital control, to confirm the effectiveness of the solution and validity of the simulation results.
Active Ripple Energy Storage Circuit with Extended Hold-Up Time Capability and Minimum Capacitance for High Power Dense Rectifiers
Petrella R.
2023-01-01
Abstract
Industrial single-phase rectifiers typically require a bulky passive energy storage device to both handle the double-line frequency power ripple and to maintain operation during AC line drops out, affecting power density and lifetime. A possible approach allowing a strong reduction of the volume of the required storage device is the adoption of active energy storage systems (ARES). This is normally implemented through a bi-directional converter interfacing the PFC output bus and an auxiliary storage capacitor, allowing a wider voltage span across this last and a wider exploitation of energy flow needed to compensate for the ripple power/voltage. Among possible ARES topologies, the buck (from the bus) type is popular for its low component count and voltage stress, but it has poor hold-up time capability due to the lack of the buck/boost capabilities from the storage. In this paper, a buck/boost ARES circuit is proposed, with extended hold-up time capability for high power dense rectifiers. Dual voltage loop regulation method based on a 2-pole 2-zero and a resonant controller is considered for the buck/boost mode from the bus (i.e., compensation of the bus voltage ripple), whilst a 3-pole 2-zero controller allows to sustain the PFC bus voltage during AC line drops, i.e. buck/boost mode from the storage. The proposed ARES solution has been fully validated through simulations. A 2 kW prototype has been developed, based on SiC power MOSFETs and digital control, to confirm the effectiveness of the solution and validity of the simulation results.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
