A novel step‐up topology for multilevel power conversion. (2nd September 2022)

• Record Type: Journal Article
• Authors: Jain, Anekant; Gupta, Krishna Kumar; Jain, Sanjay K.
• Is Part Of: International journal of circuit theory and applications. Volume 51:Number 1(2023)
• Page Start: 265
• Page End: 282
• Publication Date: 2022-09-02
• Subjects: multilevel inverter -- renewable energy source -- switched‐capacitor -- voltage boost; Electric circuit analysis -- Periodicals; 621.319205
• DOI: 10.1002/cta.3430
• Languages: English
• ISSNs: 0098-9886

Abstract

Abstract: Renewable energy sources employ a power conditioning unit for injecting power into the grid. Such resources of small capacity are characterized by low generated voltage and thus require a high voltage boost at the inversion stage. This paper proposes a novel transformer‐less, single‐phase grid‐connected, 13‐level inverter to yield the voltage boost. The presented topology is realized through 12 unidirectional switches, 2 diodes, and 3 capacitors. A single‐stage circuit synthesizes 13 levels with a single input source and yielding an overall voltage gain of six. The adapted modulation technique is robust enough to keep the capacitors self‐balanced for all values of the modulation index. The proposed topology is modular and cost‐effective in comparison to other similar typologies due to reduced device count and space requirement. The presented topology is validated experimentally with satisfactory operation in yielding input voltage boost by a factor of six. Abstract : The grid‐integrated renewable energy sources (RES) employ a power conversion system to inject the power into the grid. Multilevel inverters (MLIs) are used with such systems due to their advantages, such as reduced dv/dt stress on switches, producing near sinusoidal staircase output and operating at small switching frequencies. The proposed work synthesizes a 13‐level output waveform with 12 switches, 2 diodes, and 3 switched capacitors (SCs). All SCs are inherently balanced and do not require any sensors or complex control mechanisms.