Sensorless Control and Synchronization for Solid-State Transformers Based on Active Unity Power Factor Modules
Conference: PCIM Europe 2022 - International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management
05/10/2022 - 05/12/2022 at Nürnberg, Germany
doi:10.30420/565822036
Proceedings: PCIM Europe 2022
Pages: 6Language: englishTyp: PDF
Authors:
Freijedo, Francisco D.; Lopez, Diego; Wijekoon, Thiwanka; Bakic, Miroljub (Huawei Technologies Duesseldorf, Nuremberg Research Center, Germany)
Abstract:
This work addresses the control of Input Series Output Parallel (ISOP) Solid State Transformers (SST) based on Pulse-Width Modulation Active Unity Power Factor Rectifier (PWM-UPFR) Modules. The synchronization of the AC current references is crucial to achieve distortion-less zero crosses. This work proposes a method to achieve optimal operation by settling a synchronization path that feeds the phase-locked loop with the PWM voltage reference (i.e., with the control action of the current loop). Conditions for avoiding positive-feedback by tuning are discussed, as well as harmonic distortion mitigation by resonant filters with anti-windup. The key performances are proved by experimental verification.