Abstract
Single-stage high-gain inverters have recently gained much research focus as interfaces for inherent low voltage DC sources such as fuel cells, storage batteries, and solar panels. Many impedance-assisted inverters with different input stage configurations have been presented. To decrease passive component sizes, these inverters operate at high-frequency switching. The high-frequency switching optimizes the passive component sizes but introduces many challenges in the form of high-frequency inductor design, control complexity, high-frequency gate driver requirements, high semiconductor losses, and electromagnetic interferences. This article proposes a novel fundamental frequency switching operation for the conventional voltage source inverters (VSI) to operate as a single-stage high-gain inverter. As the novel operational strategy changes the behavior of conventional VSI from buck inverter to a boost inverter, it is hereafter termed as a novel inverter. By virtue of the operation strategy, switches withstand peak inverse voltage (PIV) equal to DC link voltage, unlike other impedance assisted boost inverters where PIV across switches is the amplified DC voltage. The proposed inverter can invert low-level DC voltage to high voltage AC with low total harmonic distortion (THD) in a single stage without the help of any external filter. A novel quarter-wave symmetric phase-shift controller is proposed for variable voltage and frequency control of proposed inverters tuned by a back-propagation thin-plate-spline neural network (BPTPSNN). Mathematical analysis with experimental validation is presented. Experimentation is carried out on a prototype of 2 kW for single-phase resistive load, induction motor, and non-linear loads.
Highlights
The limited availability of fossil fuels and increasing pollution can never fulfill the ever-increasing energy demand
Single-stage single-phase boost inverters have the symmetric operation as two converters are working in tandem, so for a proper sinusoidal output waveform generation, the two converters need to be in perfect synchronism.; such converters tend to destabilize above the duty cycle of 0.5, so they are operated in the duty cycle range of 0 to 0.5 [24]
The article utilized the conventional H-Bridge-based voltage source inverters (VSI) structure to convert it into a high gain fundamental frequency switched boost inverter capable of converting low voltage
Summary
The limited availability of fossil fuels and increasing pollution can never fulfill the ever-increasing energy demand. CSIs employ a high-value inductor at the DC link side, increasing overall system cost and weight Control of such systems tends to be complicated as constant output voltage must be maintained. The basic ZSI and the modified and enhanced structures provide boosted DC voltage at the interim inverting stage at the cost of passive components. This increases the component count, size, weight, and above all, the control complexity. A few state-of-the-art structures employ switched-capacitor inverters to boost low-level DC to high voltage AC in a single stage [22,23,24,25]. The authors propose a new fundamental frequency switched single-stage high-gain quasi-resonant inverter. Low PIV across switches; Low total blocking voltage (TBV) of converter, signifying minimal semiconductor loss; Filter-free low THD output waveform; Fundamental-frequency switching eliminates switching losses; Supports resistive, inductive as well as non-linear loads; Low passive component requirement
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