Analysis of three-level buck-boost converter operation for improved renewable energy conversion and smart grid integration

Soman, Deepak Elamalayil; Vikram, K.; Krishna, Remya; Gabrysch, Markus; Kottayil, Sasi K.; Leijon, Mats

doi:10.1109/energycon.2014.6850409

Cited by 9 publications

(3 citation statements)

References 13 publications

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“…Even though the duty ratio and pulse delay are inter‐dependent to produce the compensation voltage, the good agreement between simulation and experimental results show a stable operation of the converter. The capacitor voltages remain in balance if the required compensation voltage is less than 39% of the total DC link voltage, but this value is only 16% for a three‐level buck boost converter [27]. Subsequently, the inverter output waveform distortions are decreased after compensating the capacitor voltage balancing.…”

Section: Discussionmentioning

confidence: 99%

Pulse delay control for capacitor voltage balancing in a three‐level boost neutral point clamped inverter

Krishna

Soman

Kottayil

et al. 2015

IET Power Electronics

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The cross regulation effect in multi-output DC/DC converters offers a reliable support for the grid integration of multilevel inverters by balancing the capacitor voltages. The capacitor voltage balancing by single input dual output boost converter is often realised by conventional three-level switching scheme. The three-level operation benefits lower inductor ripple current, but it limits the maximum possible compensation voltages. In this study, the entire operating modes of the boost converter is presented and all the possible cases which contribute to the voltage balancing are employed for balancing the capacitor voltages in a three-level neutral point clamped inverter. A proportional-integral controller based duty ratio control and pulse delay control are used for DC link voltage regulation and capacitor voltage balancing. Since the classical state-space averaging technique is not suitable for SIDO converters, inductor current ripple averaging technique is utilised for controller design. The circuit simulation is performed in Matlab/Simulink. The digital controller is realised using the Virtex-5FPGA in Labview/CompactRIO module. Both simulation and experimental results are presented to validate the controller performance. www.ietdl.org 268This is an open access article published by the IET under the Creative Commons Attribution License

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Section: Discussionmentioning

confidence: 99%

Pulse delay control for capacitor voltage balancing in a three‐level boost neutral point clamped inverter

Krishna

Soman

Kottayil

et al. 2015

IET Power Electronics

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“…This section discusses about the basic TLBBC circuit with the four operating modes [16], as shown in Figure 1. Depending on the position of the switches S1 and S2, there are four modes of operation for the TLBBC: mode1, mode2, mode3, and mode4.…”

Section: Three-level Buck-boost Converter-modes Of Operationmentioning

confidence: 99%

Cross-Regulation Assessment of DIDO Buck-Boost Converter for Renewable Energy Application

Soman

Leijon

2017

Energies

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When medium-or high-voltage power conversion is preferred for renewable energy sources, multilevel power converters have received much of the interest in this area as methods for enhancing the conversion efficiency and cost effectiveness. In such cases, multilevel, multi-input multi-output (MIMO) configurations of DC-DC converters come to the scenario for integrating several sources together, especially considering the stringent regulatory needs and the requirement of multistage power conversion systems. Considering the above facts, a three-level dual input dual output (DIDO) buck-boost converter, as the simplest form of MIMO converter, is proposed in this paper for DC-link voltage regulation. The capability of this converter for cross regulating the DC-link voltage is analyzed in detail to support a three-level neutral point clamped inverter-based grid connection in the future. The cross-regulation capability is examined under a new type of pulse delay control (PDC) strategy and later compared with a three-level boost converter (TLBC). Compared to conventional boost converters, the high-voltage three-level buck boost converter (TLBBC) with PDC exhibits a wide controllability range and cross regulation capability. These enhanced features are extremely important for better regulating variable output renewable energy sources such as solar, wind, wave, marine current, etc. The simulation and experimental results are provided to validate the claim.

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“…Research on bidirectional DC-DC converters for connection with DC microgrids has been explored widely in recent years [11][12][13][14][15]. The bidirectional converter is generally based on conventional topologies, such as Buck/Boost, Buck-Boost, Cuk, and SEPIC/Zeta converters.…”

Section: Introductionmentioning

confidence: 99%

Experimental Evaluation of a 2 kW/100 kHz DC–DC Bidirectional Converter Based on a Cuk Converter Using a Voltage-Doubler Concept

Lopes,

Martins,

Converti

et al. 2024

Energies

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This paper presents a theoretical analysis of steady-state operation, control-oriented modeling for voltage control, and the experimental results of a DC–DC bidirectional converter based on a Cuk converter using a voltage-doubler concept. Due to the voltage-doubler concept, the voltage stress across semiconductors is reduced when compared with the conventional Cuk converter; this allows for the use of semiconductors with reduced drain–source on-resistance. Moreover, due to the input and output current source characteristics, the converter presents advantages, such as draining/injecting currents on both sides with low-ripple currents. Furthermore, the theoretical analysis is verified by experimental results obtained from a proof-of-concept prototype designed with a 250 V input voltage, a 360 V output voltage, 2 kW rated power, and 100 kHz switching frequency.

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Analysis of three-level buck-boost converter operation for improved renewable energy conversion and smart grid integration

Cited by 9 publications

References 13 publications

Pulse delay control for capacitor voltage balancing in a three‐level boost neutral point clamped inverter

Pulse delay control for capacitor voltage balancing in a three‐level boost neutral point clamped inverter

Cross-Regulation Assessment of DIDO Buck-Boost Converter for Renewable Energy Application

Experimental Evaluation of a 2 kW/100 kHz DC–DC Bidirectional Converter Based on a Cuk Converter Using a Voltage-Doubler Concept

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