Solar photovoltaic power conversion using modular multilevel inverter

Sp, Swetha; Sumangala, B. V.

doi:10.1109/erect.2015.7499046

Cited by 5 publications

(9 citation statements)

References 7 publications

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“…As a result, the circulating current described in (6) contains 1/3 of the DC link current I dc 3 and i cir,j is the AC component of circulating current. The dynamics of an MMC are characterized in Equations 7and (8). By evaluating Equation 7, the output current i u,j can be controlled by e v,j .…”

Section: System Mathematical Modelingmentioning

confidence: 99%

“…represent output voltage of converter at point Z. and and n i n,j equal to one means the SM capacitor is inserted while insertion indices n i m,j and n i n,j equal to zero means the SM capacitor is bypassed in corresponding arms. As stated by Equations (8) and 9, the reference calculated for the arm voltages can be expressed as…”

Section: System Mathematical Modelingmentioning

confidence: 99%

“…The i di f f ,j can be regulated by v di f f ,j , therefore, a control scheme is needed to regulate v di f f ,j for controlling i di f f ,j to overcome the converter losses. The variable v di f f ,j is obtained through (8). A feedforward part is added to compensate the voltage drop.…”

Section: Circulating Current Controlmentioning

confidence: 99%

“…The MMC is becoming an increasingly attractive, competitive, and highly applied technology for medium and high voltage power applications due to its advantages, such as low harmonics, modular structure, simple scaling, loss reduction in switches, and satisfactory fault management [1][2][3]. Currently, MMCs have been expanded to many applications [4] such as motor drivers [5], solar/wind power systems [6][7][8], energy transmission and distribution systems [9], and static synchronous compensators (STATCOM) [10]. Recently published literature related to MMC targeted current control, voltage control, loss analysis and modulation, dynamic and steady-state models, modeling, and simulation methods [11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

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A New Adaptive Approach to Control Circulating and Output Current of Modular Multilevel Converter

et al. 2019

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This paper addresses the output current and circulating current control of the modular multi-level converter (MMC). The challenging task of MMCs is the control of output current and circulating current. Existing control structures for output and circulating current achieve control objectives with comparatively complex controllers and the designed parameters for the controller is also difficult. In this paper, an adaptive proportional integral (API) controller is designed to control the output current and the circulating current. The output current is regulated in α β axes while the circulating current is regulated in the a b c stationary frame to enhance MMC performance. The output and circulating current control results using an API controller are compared with the conventional proportional resonant (PR) controller in terms of transient response, stability, optimal performance, and reference tracking for results verification. The API control architecture significantly improve transient response, stability, and have excellent reference tracking capability. Moreover, it controls output current and converges the circulating current to a desired value. The control structure is designed for a three-phase MMC system, simulated and analyzed in MATLAB-Simulink.

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Section: System Mathematical Modelingmentioning

confidence: 99%

Section: System Mathematical Modelingmentioning

confidence: 99%

Section: Circulating Current Controlmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A New Adaptive Approach to Control Circulating and Output Current of Modular Multilevel Converter

et al. 2019

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“…When using MMCs for renewable energies, specifically for PV applications, the mainstream is the topology shown in Figure 2, used in [15,16], where PV panels are connected to the grid or load by the MMC through a DC link. In contrast, recently, a new topology has been proposed in [9,17], as shown in Figure 3.…”

Section: Introductionmentioning

confidence: 99%

Local Carrier PWM for Modular Multilevel Converters with Distributed PV Cells and Circulating Current Reduction

et al. 2020

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A new topology has been recently proposed for grid-connected photovoltaic (PV) systems, using modular multilevel converters (MMCs) and distributing PV panels throughout the MMC cells. This topology has two main advantages: it reduces the power losses related to moving the energy into the MMC capacitors from an external source, and it removes the losses and costs related to the DC to DC converters used to track the maximum power point on string converters or central converters, because that task is delegated to MMC cells. However, traditional pulse width modulation (PWM) techniques have many problems when dealing with this application: the distortion at the output increases to unacceptable values when MMC cells target different voltages. This paper proposes a new modulation technique for MMCs with different cell voltages, taking into account the measured cell voltages to generate switching sequences with more accurate timing. It also adapts the modulator sampling period to improve the transitions from level to level, an important issue to reduce the internal circulating currents. The proposed modulation has been validated using simulations that show a consistent behavior in the output distortion throughout a wide operation range, and it also reduces the circulating currents and cuts the conduction losses by half. The behavior of this new topology and this new modulation has been compared to the mainstream topology with external PV panels and also to a fixed carrier modulation.

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Modeling and Control of Single-Phase Modular Multilevel Converter Using Backstepping Approach

El Boudali,

Abouloifa,

Lachkar

et al. 2024

Lecture Notes in Electrical Engineering

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Solar photovoltaic power conversion using modular multilevel inverter

Cited by 5 publications

References 7 publications

A New Adaptive Approach to Control Circulating and Output Current of Modular Multilevel Converter

A New Adaptive Approach to Control Circulating and Output Current of Modular Multilevel Converter

Local Carrier PWM for Modular Multilevel Converters with Distributed PV Cells and Circulating Current Reduction

Modeling and Control of Single-Phase Modular Multilevel Converter Using Backstepping Approach

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