Loop Gain Modeling of a Single-Phase PFC for Online Small-Signal Stability Monitoring
- Resource Type
- Conference
- Authors
- Lin, Qing; Wen, Bo; Burgos, Rolando; Li, Xiong; Wang, Qiong
- Source
- 2023 IEEE Applied Power Electronics Conference and Exposition (APEC) Applied Power Electronics Conference and Exposition (APEC), 2023 IEEE. :1292-1298 Mar, 2023
- Subject
- Power, Energy and Industry Applications
Voltage measurement
Systems operation
Power factor correction
Gain measurement
Stability analysis
Power electronics
Impedance
loop gain
d-q frame
online stability monitoring
Power factor correction (PFC)
low-frequency instability
- Language
- ISSN
- 2470-6647
Loop gain with sufficient margin usually indicates a good design in terms of small-signal stability. Power factor correction (PFC) converters are designed with a proper loop gain before being installed in the field. However, its actual loop gain will change after being connected to different source impedance, which reflects the system stability condition. For a single-phase and a three-phase-four-wire system, this paper proposes the voltage loop gain models of a PFC converter based on the virtual d-q frame concept and verifies the models with simulation and experimental measurement results. The proposed models are more accurate compared with conventional quasi-static approximation. And the models make it possible to apply loop gain-based stability monitoring of an ac system and guide system operation because it can instruct the understanding of the system conditions' impact on the PFC loop gain.