Ranoyca N. A. L. Silva

Interleaved-Boost Converter With High Voltage Gain

This paper presents an interleaved-boost converter, magnetically coupled to a voltage-doubler circuit, which provides a voltage gain far higher than that of the conventional boost topology. Besides, this converter has low-voltage stress across the switches, natural-voltage balancing between output capacitors, low-input current ripple, and magnetic components operating with the double of switching frequency. These features make this converter suitable to applications where a large voltage step-up is demanded, such as grid-connected systems based on battery storage, renewable energies, and uninterruptible power system applications. Operation principle, main equations, theoretical waveforms, control strategy, dynamic modeling, and digital implementation are provided. Experimental results are also presented validating the proposed topology.

High-Voltage Gain Boost Converter Based on Three-State Commutation Cell for Battery Charging Using PV Panels in a Single Conversion Stage

This paper presents a novel high-voltage gain boost converter topology based on the three-state commutation cell for battery charging using PV panels and a reduced number of conversion stages. The presented converter operates in zero-voltage switching (ZVS) mode for all switches. By using the new concept of single-stage approaches, the converter can generate a dc bus with a battery bank or a photovoltaic panel array, allowing the simultaneous charge of the batteries according to the radiation level. The operation principle, design specifications, and experimental results from a 500-W prototype are presented in order to validate the proposed structure.

Single stage high voltage gain boost converter with voltage Multiplier Cells for battery charging using photovoltaic panels

This paper presents a non-isolated high frequency DC-DC converter, which integrates a battery charger, photovoltaic panels, and a high voltage gain boost converter in a single conversion stage with soft-switching characteristic. The proposed topology uses voltage Multiplier Cells (MCs), leading do high voltage step-up. Also, the bidirectional behavior admits the DC bus to be generated via battery bank, or photovoltaic panels, or both, depending on the insulation condition. At last, experimental results validate the proposed topology, proving its effectiveness.

Five-level hybrid converter based on a Half-Bridge/ANPC cell

This work presents a novel five-level hybrid Half-Bridge/ANPC multilevel inverter. Along with the switching states possibilities, employed modulation techniques, conduction losses analysis, and simulation results from a three-phase topology, it is presented the experimental results from a monophasic structure, operating with 1020Hz switching frequency, output frequency of 60Hz, phase output voltage of 220Vrms, output power of 2.3kW and power factor of 0.92. From the presented results, it can be noticed the reduced losses and better harmonic content.

Voltage doubler boost rectifier based on three-state switching cell for UPS applications

This paper presents a voltage doubler boost rectifier based on three-state switching cells for uninterruptible power supply (UPS) applications. Its main features are: high power factor, reduced conduction losses, weight and volume, simple control strategy, and connection between input and output enabling the use of inverter and bypass. A theoretical analysis, simulation results and experimental results from a 3 kW lab model are presented.

High voltage gain single stage DC-DC converter based on three-state commutation cell

This paper presents a high voltage gain single stage DC-DC converter based on the three-state commutation cell. The presented converter operates with soft-switching ZVS mode for all switches. The operation principle, project specifications, and experimental results from a 500W prototype are presented in order to validate the proposed structure. The results show de soft switch commutation, reduced stress and high efficiency (over 94%).

Carrier-based PWM modulation for THD and losses reduction on multilevel inverters

This paper presents an adapted carrier-based PWM modulation technique to be applied on both NPC and FC structures of multilevel inverters. The proposed modulation leads to an improved performance of the output voltage THD and also reduces the total loss dissipation across the semiconductors devices, when compared to other conventional carrier-based PWM modulation techniques, such as PSPWM and LSPWM. The effectiveness of the proposed technique is demonstrated through experimental results of a three-phase, three-level, 6kW prototype.

PID digital control applied to a high voltage gain converter with soft-switching cells

This paper presents the control strategy and the experimental results of a high voltage gain converter with soft-switching cell. The PID compensator is digitally implemented using a PIC 16F877 microcontroller, which guarantees the regulation of the output voltage, instead of load variations. Low switching stress, ZCS operation for auxiliary switches and ZVS for main switches, and high efficiency are expected. Theoretical analysis, operation principle and topology details are presented and validated through experimental results.

Modulation technique based on CSV-PWM and HEPWM for THD reduction in flying capacitor multilevel inverters

This paper presents a modulation technique for flying capacitor multilevel inverter. The proposed modulation improves power quality, reducing the total harmonic distortion and combining the advantages of two modulation techniques: HE-PWM and CSV-PWM. In order to validate the proposed method, experimental results have been included concerning a three-level 6 kW, 0.92 power factor flying capacitor inverter. The experimental results presented THD around 41.38%.

Digital implementation of a modulation technique for a multilevel inverter on FPGA

This paper presents a digital implementation of the modulation technique based on the PD-PWM using a FPGA (Field Programmable Gate Array) with its logical structure developed through the VHDL language. The technique uses a modified modulation and two triangular carriers which its applied to a five level hybrid multilevel inverter (based on the Half-Bridge and ANPC topologies). The experimental results validate both the digital development of the technique on FPGA and the presented inverter.