A New Space-Vector-Modulation Algorithm for a Three-Level Four-Leg NPC Inverter

Rojas, Félix; Kennel, Ralph; Cárdenas, Roberto; Repenning, Ricardo; Clare, Jon; Díaz, Matías

doi:10.1109/tec.2016.2605076

Cited by 37 publications

(19 citation statements)

References 34 publications

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“…A three-dimensional fast algorithm in abc coordinates has been proposed in [4], [19], [26] but that representation limits the potential of space vector modulation. The DC-link voltage balancing [18], [21]- [24], [27], [28] is omitted though it is a critical task, especially in the Active Power Filter application [10], [13], [29], [30]. In addition, the overmodulation aspect of converter control is also not considered [31].…”

Section: Three-dimensional Space Vector Modulation For Three-levementioning

confidence: 99%

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A New Concept of PWM Duty Cycle Computation Using the Barycentric Coordinates in a Three–Dimensional Voltage Vectors Arrangement

et al. 2020

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The paper presents a novel approach to the Pulse Width Modulation (PWM) duty cycle computing for complex or irregular voltage vector arrangements in the two (2D) and three-dimensional (3D) Cartesian coordinate systems. The given vectors arrangement can be built using at least three vectors or collections with variable number of involved vectors (i.e. virtual vectors). Graphically, these vectors form a convex figure, in particular, a triangle or a tetrahedron. The reference voltage vector position inside that figure can be expressed by the barycentric coordinates, which are calculated using the second (2D case) or the third-degree determinant (3D case)-without trigonometry and angles. Thus, the speed of the PWM duty cycle computation rises significantly. The use of the triangle area or the tetrahedron volume, instead of the standard vector projection also permits for a well-defined and universal approach to identifying the reference vector position, especially for converters with complex and/or deformed space-vector diagrams (i.e. floating DC-link, multisource DC-link). The proposed computation scheme is based on simple instructions without trigonometry thereby, the DSP processor, or digital solution for field-programmable gate array, can fast-perform this operation using atomic operations. The aim of the presented considerations is not a novel PWM modulation, but a computable idea of a general calculation scheme for cases in which the distribution of vectors is non-trivial. A detailed algebraic and geometric analysis, as well as mathematical proofs on the total consistency of the results with the standard projection method, are also included. Subsequently, the Three-Dimensional Space Vector Modulation (3D-SVM), is considered as a special background to present a novel approach. INDEX TERMS 3D-SVM, duty cycle calculation, nonlinear loads, space vector, pulse width modulation, 3-level 4-leg inverter.

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Section: Three-dimensional Space Vector Modulation For Three-levementioning

confidence: 99%

“…At step 3 all needed duty cycles are computed based on barycentric coordinates (26)- (30). Calculation of the following sum at step 4 for each switch state matrix H…”

Section: The Algorithm Flowchartmentioning

confidence: 99%

A New Concept of PWM Duty Cycle Computation Using the Barycentric Coordinates in a Three–Dimensional Voltage Vectors Arrangement

et al. 2020

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“…60 • DPWM is implemented by the offset voltage with microprocessor. The offset voltage is calculated by maximum and minimum of V * abcs , as shown in Equation (4). The range where the maximum value among V * abcs is larger than the minimum value among V * abcs is 60 • .…”

Section: Description Of Grid-connected Inverter Systemmentioning

confidence: 99%

“…Recently, there has been growing interest in renewable energy because of the depletion of natural resources and increasing environmental pollution from the use of fossil fuels and nuclear energy [1][2][3]. For these reasons, the use of grid-connected inverter systems for renewable energy sources has become an important topic [4,5]. High efficiency is required for the effective use of power conditioning systems (PCSs).…”

Section: Introductionmentioning

confidence: 99%

Performance Improvement for Reduction of Resonance in a Grid-Connected Inverter System Using an Improved DPWM Method

Park

Lee

2018

Energies

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This paper proposes discontinuous pulse width modulation (DPWM) for a grid-connected inverter system using an LCL-filter which consists of two inductors and a capacitor that is connected in parallel per phase. The modulation signal is discontinuously changed, and the harmonic voltages are generated in the wide frequency range at the output terminal of the inverter when the conventional DPWM is used. If these harmonic voltages are present in the resonance frequency band by an LCL-filter, then the resonance problem of the grid current occurs. To suppress the resonance problem, the proposed DPWM injects the sixth harmonic to the modulation signal. Therefore, in the improved DPWM, harmonic voltages at the output terminal of the inverter are sufficiently reduced because the discontinuous change of the modulation signal disappears. The proposed DPWM method is verified by a Powersim (PSIM) simulation (Powersim Inc., Rockville, MD, USA) and experiments with a 3-kW neutral-point clamped (NPC)-type grid-connected inverter system.

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“…However, an increased number of components and a complex control are the main disadvantages of this system. A space vector modulation-based controller has been presented in [34], however, PV side and grid side control issues have not been considered.…”

Section: Introductionmentioning

confidence: 99%

Multifunctional Distributed MPPT Controller for 3P4W Grid-Connected PV Systems in Distribution Network with Unbalanced Loads

et al. 2019

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The integration of photovoltaic (PV) systems with three-phase four-wire (3P4W) distribution networks has imposed several challenges related to existing unbalanced loads, reactive power generation and harmonics content. In this paper, a multifunctional distributed maximum power point (MPPT) controller for grid integration of PV systems is proposed. The proposed distributed MPPT controller is developed based on employing a four-leg three-level T-type multilevel inverter. The proposed inverter performs multifunctionalities, including distributed MPPT, neutral current compensation for the unbalanced loads, supplying reactive power into the grid and the grid integration. Moreover, the proposed inverter overcomes the stochastic behavior of both the PV generation with partial shading problems and its operation with unbalanced loads as well. Furthermore, the new proposed controller injects sinusoidal output currents with decreased levels of total harmonic distortion (THD) into the grid. The tested case study is investigated for the various operating scenarios of PV generation and load demands. The results and tabulated performance comparisons have proven the superior performance of the proposed multifunctional PV generation system. The results show the ability of the proposed controller to efficiently extract distributed MPPT for all PV modules at all the tested scenarios. Additional improvement of the energy efficiency is achieved through the elimination of the neutral current due to existing unbalanced loads.

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A New Space-Vector-Modulation Algorithm for a Three-Level Four-Leg NPC Inverter

Cited by 37 publications

References 34 publications

A New Concept of PWM Duty Cycle Computation Using the Barycentric Coordinates in a Three–Dimensional Voltage Vectors Arrangement

A New Concept of PWM Duty Cycle Computation Using the Barycentric Coordinates in a Three–Dimensional Voltage Vectors Arrangement

Performance Improvement for Reduction of Resonance in a Grid-Connected Inverter System Using an Improved DPWM Method

Multifunctional Distributed MPPT Controller for 3P4W Grid-Connected PV Systems in Distribution Network with Unbalanced Loads

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