Work in Progress: Output Impedance Specification of A Three-Phase Current-Source Inverter for Modular Photovoltaic Applications

• Main Authors: Peng Q., Migliazza G., Buticchi G., Guenter S., Tan N.M.L., Yang J., Wheeler P.
• Other Authors: 57804706700
• Format: Conference Paper
• Published: Institute of Electrical and Electronics Engineers Inc. 2024
• Subjects: current-source converter; impedance; photovoltaic; stability analysis; Electric impedance; System stability; Current source converters; Current source inverter; Impedance; Modulars; Output impedance; Photovoltaic applications; Photovoltaics; Reference frame; Stability analyze; Three-phase currents; Electric inverters
• Institution: Universiti Tenaga Nasional

Impedance-based stability assessment has been an important part of renewable integration. Modeling and measurement of impedance under Synchronized Reference Frame (SRF) is a common way for a portrait of the frequency-dependent impedance. In this paper, a modified current-source inverter (CSI) called CSI7 for photovoltaic (PV) integration is studied. The SRF admittance of the system under different solar irradiation from 400W/m2 to 1000W/m2 with a resolution of 100W/m2 is measured in PLECS simulation. It is found that large frequency-dependent admittance appears under the high-frequency zone of the q axis which could lead to harmonic instability problems. � 2023 IEEE.