Inverter-Integrated Acquisition of the Current Through the DC-Link Based on the Measured DC-Link Voltage
Konferenz: PCIM Europe 2023 - International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management
09.05.2023-11.05.2023 in Nürnberg, Germany
doi:10.30420/566091170
Tagungsband: PCIM Europe 2023
Seiten: 7Sprache: EnglischTyp: PDF
Autoren:
Randerath, Joschka; Krah, Jens Onno (Cologne University of Applied Science, Cologne, Germany)
Holtz, Joachim (University of Wuppertal, Germany)
Inhalt:
The current through the DC-link capacitor is estimated based on the measured DC-link voltage. The method uses σ-δ modulation and refers to two parameters of the DC-link capacitor. Analog pre-emphasis and digital de-emphasis improves the resolution of the measured voltage signal. In this way, the DC-link capacitor rms current can be estimated also for complex multi-inverter systems with DC-link circuits in parallel connection, with braking choppers, etc. A current transducer is not required.