Abstract
In a single-stage buck-boost quasi-switched boost inverter (qSBI), the shoot-through state insertion causes high amplitude common-mode voltage. Consequently, the qSBI becomes less attractive in transformerless photovoltaic (PV) systems. In this paper, a novel space vector pulse-width modulation for a modified qSBI is introduced to reduce the magnitude of common-mode voltage and push the modulation index up to 1. By properly choosing the shoot-through interval time, shoot-through states are considered to be inserted for boosting voltage and also reducing the THD value of the output voltage. The mathematical analysis and operating principles of the converter are discussed and verified through PSIM simulations. Finally, an experimental prototype is validated based on a TMS320F28335 DSP microcontroller and a DE0-Nano FPGA digital control platform.
Highlights
Distributed generation has emerged as an effective way to use different renewable energy sources such as photovoltaics (PVs), wind power, and fuel cell stacks for enhancing reliability, reducing emissions, and improving additional power quality benefits
The objective of this paper is to propose novel AZ-SVPWM schemes in a modified 2S-quasi-switched boost inverter (qSBI) (M2S-qSBI)
The common-mode voltages (CMVs) of the M2S-qSBI with under the AZST-SVM methods is 117 V that is equal to 33.3% of the DC-link voltage, as shown in Figs. 9(c) and 10(c)
Summary
Distributed generation has emerged as an effective way to use different renewable energy sources such as photovoltaics (PVs), wind power, and fuel cell stacks for enhancing reliability, reducing emissions, and improving additional power quality benefits. In [29], the CMV reduction three-phase ZSI was proposed by applying the RS-SVPWM strategy In this method, an extra diode is added to the negative terminal of the PV source to provide the isolation between the PV panels and the inverter during ST states. The modified HERIC-based ZSI/ qZSI topologies with two extra controlled switches and diodes were discussed in [32] to reduce the CMV/ CMC These solutions will cause a high voltage stress on semiconductor devices of the three-phase system. Like conventional SVM, the proposed CMV reduction strategies can operate with a modulation index up to 1 In these proposed methods, the ST states are inserted within zero vector interval time to guarantee voltage boosting and to reduce the output voltage distortion.
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