On the DC/DC converters for cascaded asymmetric multilevel inverters aimed to inject photovoltaic energy into microgrids

Silva, Pablo G.; Muñoz, Javier; Aliaga, Rodrigo; Gaisse, Patricio; Restrepo, Carlos; Fernández, Mario

doi:10.1109/spec.2016.7846160

Cited by 8 publications

(3 citation statements)

References 21 publications

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“…The stepped response is obtained by an ensemble of properly placed power electronic devices with switching either isolated DC sources [1] or multiple DC sources obtained through spilt capacitors by diode clamping [2] otherwise by flying capacitors [3]. Apart from lower THD, MLI rises above the restrictions due to the limited rating of power semiconductors, reduces dV dt stress of switch and issues due to common voltage [4,5]. The International standards allow direct grid connection of MLI for medium and high power applications without isolation [5], thus providing a • The increase in controlled switches reduces the THD thereby, increasing the control complexity and cost in terms of requirements in driver circuits.…”

Section: Introductionmentioning

confidence: 99%

“…Apart from lower THD, MLI rises above the restrictions due to the limited rating of power semiconductors, reduces dV dt stress of switch and issues due to common voltage [4,5]. The International standards allow direct grid connection of MLI for medium and high power applications without isolation [5], thus providing a • The increase in controlled switches reduces the THD thereby, increasing the control complexity and cost in terms of requirements in driver circuits. • The PV system is designed for long durations; however, the low-reliability power electronic devices reduce the converter's reliability.…”

Section: Introductionmentioning

confidence: 99%

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Fault detection technique for modified cascaded half-bridge multi-level inverter with polarity changer in pv grid system

Vyas

Shah

Srivani³

2021

SN Appl. Sci.

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Multilevel Inverters (MLI) are a viable option for a filter-less and transformerless photovoltaic system for direct grid integration, reducing losses, space and cost provided the issues of control and reliability are resolved. A modified cascaded half-bridge MLI with polarity changer is proposed with a reduced number of switches, thereby reducing control complexity. The proposed converter is designed for both seven-level and nine-level topologies. Selective harmonic elimination has been adopted to switch converter and the transcendental equations are solved by the gravitational search algorithm. The THD for nine-level configuration is 7.94% and 5.86% with MPPT and DC source inputs, respectively. The analysis on the open-circuit fault of switches confirms the presence of only five critical switches irrespective of the number of increase in levels, thereby requiring only five redundant switches at the Polarity Changer. The output voltage waveform is subjected to multiresolution analysis for feature extraction of voltages under various irradiance and temperature conditions. A conditions based fault detection algorithm is developed based on the observations of energies of signals to detect the open circuit fault in switches. Based on the comparative analysis, the proposed converter has fewer controlled switches for nine levels or higher configurations than other topologies. Apart from this, the high reliability due to inherent fault isolation capability restricted to half-bridge compared to different MLI topologies shows its superiority. For a nine-level MLI proposed topology reduces the cost considering redundancies for FDI in range of 67–30% depending on the topology for comparision. The system is simulated using MATLAB –Simulink and further validated by experimental results.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fault detection technique for modified cascaded half-bridge multi-level inverter with polarity changer in pv grid system

Vyas

Shah

Srivani³

2021

SN Appl. Sci.

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“…These last two cells have to ensure the proportion in terms of the DC voltage of the HPC cell despite the changes in solar irradiance upon the photovoltaic panels. It is important to mention that the voltage ratio for the MPC and the LPC must be ensured by external control loops and additional hardware (DC/DC converters), as deeply explained in [31,32]. It is important to consider that non-compliance with asymmetry implies a harmonic distortion in the output signal of the converter, which means losses attributed to the generation of harmonics in the AC current.…”

Section: Introductionmentioning

confidence: 99%

Improved Predictive Control for an Asymmetric Multilevel Converter for Photovoltaic Energy

et al. 2020

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This article proposes a 27-level asymmetric cascade H-bridge multilevel topology for photovoltaic applications, which considers a predictive control strategy that allows minimization of the commutations of the converter. This proposal ensures a highly sinusoidal and stable photovoltaic injection when there are solar irradiance disturbances, generating a low distortion in the current waveform and low switching losses. To validate the performance of the control and the proposed topology, the dynamic model of the alternating current (AC) and direct current (DC) side system is first obtained, which is checked by computational simulations. Subsequently, the implementation of a master–slave control is carried out, focused on the control of DC voltage and AC current. The proposal is simulated, and the total harmonic distortion (THD) is obtained in the voltage and current waveforms. Undesired commutations, typical of the predictive control, are eliminated in the AC voltage waveform, and a proper DC voltage tracking is achieved for the high-power cell. In order to demonstrate the performance of the proposed control strategy, a low-power proof-of-concept prototype is implemented, in which the energy is injected to the grid, under the event of solar irradiance disturbances (with DC control).Then, the undesired switching in the main cell is eliminated, generating THDs in the voltage and current signal of 7.76% and 2.65%, respectively.

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Proportional resonant controller for a 27-level asymmetric multilevel STATCOM

Muñoz

Gaisse

Cadena

et al. 2017

2017 CHILEAN Conference on Electrical, Electronics Engineering, Information and Communication Technologies (CHILECON)

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On the DC/DC converters for cascaded asymmetric multilevel inverters aimed to inject photovoltaic energy into microgrids

Cited by 8 publications

References 21 publications

Fault detection technique for modified cascaded half-bridge multi-level inverter with polarity changer in pv grid system

Fault detection technique for modified cascaded half-bridge multi-level inverter with polarity changer in pv grid system

Improved Predictive Control for an Asymmetric Multilevel Converter for Photovoltaic Energy

Proportional resonant controller for a 27-level asymmetric multilevel STATCOM

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