Modulation for Cascaded Multilevel Converters in PV Applications With High Input Power Imbalance

Ko, Youngjong; Andresen, Markus; Wang, Kangan; Liserre, Marco

doi:10.1109/tpel.2021.3065028

Cited by 25 publications

(6 citation statements)

References 38 publications

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“…Extracting the maximum power from a PV system is essential for optimizing its use, so operating it at the maximum power point (MPP) condition is necessary [31][32][33][34][35][36][37]. The MPPT algorithm based on incremental conductance (INC) is employed to utilize the maximum permissible PV power.…”

Section: Maximum Power Point Tracking (Mppt)mentioning

confidence: 99%

Model-Free Predictive Current Control of a 3-φ Grid-Connected Neutral-Point-Clamped Transformerless Inverter

et al. 2023

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Utility grid-tied photovoltaic (PV) installations are becoming a typical component of the current electrical energy grid. The adoption of transformerless inverters has recently changed the topology of these systems. Despite being small, inexpensive, and effective, transformerless inverters have a recurring leakage current issue. Numerous studies are being conducted to improve its performance and bring the leakage current down to acceptable levels. The studies propose three tracks for addressing the leakage current problem of transformerless PV systems: the control technique, the inverter modulation, and the inverter topology. This study applies the model-free predictive control (MFPC) technique to a grid-connected NPC 3-φ transformerless converter powered by a PV panel. An LCL filter connects the transformerless inverter to the grid. The system model considers the grid filter components and the internal impedance of the utility grid. The proposed system’s discrete model is established before describing the MFPC controller’s algorithm. The suggested system is simulated in MATLAB using the MFPC and a standard PI current controller with SVPWM modulation. According to the simulation’s findings, the MFPC controller performs best regarding current spectrum, THD, and earth leakage current. Additionally, MFPC-based systems are more efficient than those that use PI controllers.

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Section: Maximum Power Point Tracking (Mppt)mentioning

confidence: 99%

Model-Free Predictive Current Control of a 3-φ Grid-Connected Neutral-Point-Clamped Transformerless Inverter

et al. 2023

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“…By substituting ( 6) into (4), the coefficients are obtained, which are used to calculate the fundamental component in (5). Consequently, the fundamental frequency component of the clamped signal F c (ϕ) is derived in (7). On the other hand, the fundamental frequency component of the non-clamped signal F nc (ϕ) can be simply found by subtracting F c (ϕ, α) from the total modulation index 2M .…”

Section: Voltage Balancing Capabilitymentioning

confidence: 99%

“…In some applications, either the unbalanced loading power is unavoidable or the loading power of each cell is controlled to be unbalanced on purpose. The multi-string photovoltaic systems, where each string is connected to the respective DC bus, is one of the representative examples [4]- [7]. In such systems, a mismatch in the operating conditions inherently results in the unbalanced power generation among the strings.…”

Section: Introductionmentioning

confidence: 99%

DC-Link Voltage Balancing Modulation for Cascaded H-Bridge Converters

Tcai

Liserre

2021

IEEE Access

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Cascaded H-Bridge (CHB) converters have been widely employed in various applications, providing the advantages of modularity and multilevel voltage output. However, technically the CHB converters require isolated DC-link buses, which need to be regulated individually. In this context, a control scheme for the CHB converters features the voltage balancing algorithm. The voltage balancing control is typically performed by PI controller, where its control capability is limited by linear modulation region. In this work, the modulation based voltage balancing algorithm is proposed, which extends the balancing control capability and improves the dynamic performance. The proposed method is theoretically analyzed and validated through the simulation and experimental results. INDEX TERMS Multilevel converter, Cascaded-H bridge converter, DC-link voltage balancing, Modulation.

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“…In such a case, the PV power production can no longer be transferred to the storage, thus, to avoid an undesirable complete curtailment of the available PV power, the system should be able to invert its operation with the aim of providing the produced PV power to the grid. It means that the system must now work as a grid-connected double-stage PV CHB inverter [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Inverter Operation Mode of a PhotoVoltaic Cascaded H-Bridge Battery Charger

et al. 2023

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The paper deals with a grid-connected single-phase battery charger integrated with photovoltaic generators (PVGs). The circuit topology consists of a multilevel architecture based on a Cascaded H-Bridge (CHB) rectifier. Its main task is to charge the batteries, primarily from the PVGs, by also assuring to keep their state-of-charge (SOC) balanced. Nevertheless, when the battery SOC overcomes a predefined upper limit, beyond which the charging process could be interrupted, the available PV power can no longer be transferred to the batteries. Therefore, to avoid an undesired curtailment of PV power production, this latter can be supplied to the grid by inverting the system operation. The paper shows how to achieve this result by implementing a dedicated control action based on a multi-step procedure. Numerical investigations are carried out on a 19-level CHB converter implemented in the PLECS environment to validate the feasibility and effectiveness of the proposed control technique.

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Modulation for Cascaded Multilevel Converters in PV Applications With High Input Power Imbalance

Cited by 25 publications

References 38 publications

Model-Free Predictive Current Control of a 3-φ Grid-Connected Neutral-Point-Clamped Transformerless Inverter

Model-Free Predictive Current Control of a 3-φ Grid-Connected Neutral-Point-Clamped Transformerless Inverter

DC-Link Voltage Balancing Modulation for Cascaded H-Bridge Converters

Inverter Operation Mode of a PhotoVoltaic Cascaded H-Bridge Battery Charger

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