Cascaded Diode Clamped Mid Point Multi-Level Converter towards Enhanced Power Rating and Power Quality with Voltage Balancing

• Main Authors: Rajesh, Jami, Kishore, P S V, Jayaram, Nakka
• Format: Conference Proceeding
• Language: English
• Subjects: Capacitors; Cascaded diode clamped converter; Cascaded H-bridge ML converter; High power factor converter; Hybrid Converter; Multilevel converters; Power quality; Reactive power; Steady-state; Topology; Transformers
• ISSN: 2325-9418
• DOI: 10.1109/INDICON52576.2021.9691643

In this paper, an individual control scheme for a multilevel hybrid converter based on a High-Power Factor Converter (HPFC) is proposed. The proposed converter has a cascade connection of three-level diode clamped cells named as Cascaded Diode Clamped Mid-Point Multi-Level Converter (CDCMPMLC). As compared to the traditional Cascaded H-Bridge Multi-Level Converter (CHBMLC) topology, the great feature of using this proposed topology is that the DC voltage output of each cell can be doubled with the same voltage stress on the switches without affecting efficiency. This CDCMPMLC topology also enables to the connection of two DC load systems to each cell. The proposed topology can be used in a variety of applications, including transformer-free grid-connected renewable energy generation stations and Battery Energy Storage Systems (BESS). The proposed individual control scheme is used for the proposed topology. The devised scheme has been validated on simulation and experimental setup (dSPACE 1104) for various online load and source perturbations. Additionally, the converter is tested in various modes (rectification and regeneration) of operation. The proposed scheme overcomes the voltage imbalance across capacitors and maintains the source side parameters (power factor and THD of source current) within the limits of power quality standards.