A Distributed Multimode Control Strategy for the Cascaded DC–DC Converter Applied to MVAC Grid-Tied PV System

Yang, Jiatao; Li, Rui; Ma, Ke; Xu, Jun

doi:10.1109/tie.2022.3174300

Cited by 9 publications

(6 citation statements)

References 32 publications

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“…3. Since all PV submodules are connected in series, the bus voltage can be represented by (7). In addition, since the active clamp capacitor voltage can be expressed as a relationship between duty and voltage of the PV submodules, it can be expressed as (8).…”

Section: A Bus Voltage and Clamp Capacitor Voltagementioning

confidence: 99%

“…To overcome the shortcomings of the PV system, various converters such as DC optimizer and cascaded converters have been introduced to overcome the shortcomings of the PV system [4], [5], [6], [7]. However, conventional converters have to handle the rated power of PV submodule or the whole system, large volume transformer and high number of components are required causing high loss and high price of converter [8].…”

Section: Introductionmentioning

confidence: 99%

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Differential Power Processing Converter With Active Clamp Structure and Integrated Planar Transformer for Power Generation Optimization of Multiple Photovoltaic Submodules

et al. 2023

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In recent years, in order to improve the fuel efficiency of electric vehicles, a lot of research has been conducted to adopt photovoltaic (PV) systems to electric vehicles. In addition, various Differential Power Processing (DPP) converters that can mitigate power imbalance among submodules in PV systems are being studied and developed. However, most conventional DPP converters suffer from large volume, low-price competitiveness, and low efficiency. Therefore, in this paper proposes a novel DPP converter. The proposed DPP converter can significantly reduce the volume of converter by integrating multiple transformers into single transformer. Moreover, because of the active clamp structure, it is possible to eliminate secondary side circuits. Furthermore, more than 95% efficiency under 10-60% load and maximum 96.654% efficiency about 20% load were achieved. Thus, the proposed DPP converter can achieve high power density, high price competitiveness, as well as high efficiency. To support the validity of the proposed converter, a prototype of the proposed DPP converter was built, and experiments were proceeded with 8V input and 60W/30V output specifications.INDEX TERMS Active clamp, differential power processing, multi-winding, photovoltaic, planar transformer, submodule.

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Section: A Bus Voltage and Clamp Capacitor Voltagementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Differential Power Processing Converter With Active Clamp Structure and Integrated Planar Transformer for Power Generation Optimization of Multiple Photovoltaic Submodules

et al. 2023

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“…Similarly, the drain-source voltage of Q 6 reaches zero faster than those of Q 2 and Q 4 during the opposite transition. To eliminate the voltage mismatching in mode b, the charge delivered by the negative resonant current during dead time T d should be larger than the charge required to charge C r1 and discharge C r6 , as represented in (25).…”

Section: E Incomplete Soft-charging Operation and Compensation Scheme...mentioning

confidence: 99%

“…The parameters of L m , C r , and T d have already been designed in the previous subsections, so the parameter of the clamping capacitor can be calculated based on (25), as…”

Section: E Design Of Clamping Capacitormentioning

confidence: 99%

“…Furthermore, the input current ripple causes a reduction in the output power of PV systems [20], [21], [22]: in [20], experiments showed that the ripple reduction technology increased the average output power from the PV modules by 7%. This problem may also happen in the cascaded modular large-scale PV systems, where SST is applied [23], [24], [25].…”

Section: Introductionmentioning

confidence: 99%

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Multilevel Switched Capacitor LLC-DCX Converter With Embedded Filter

Okutani

Nishiyama

Huang

et al. 2023

IEEE Open J. Power Electron.

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A multilevel switched capacitor LLC-DC transformer (LLC-DCX) converter with an embedded filter is presented for a power module of solid-state transformers. The proposed converter is a hybrid converter composed of resonant switched capacitor converters (RSCCs) and a previously reported ripple-cancel converter. In contrast to the conventional SCC, which faces the issue of an inrush hard-charging current during switching transition, the proposed converter can be implemented using a soft-charging operation without additional inductors. Further, it inherits the advantages of the two converters, including load-independent soft switching, automatic voltage sharing, automatic current sharing, reduction of the current ripple, an embedded filter function, constant voltage gain, and flexible extensibility. This paper comprehensively analyzes these characteristics and the conditions for soft-charging operation. The design theory based on the analysis is also presented. We fabricated a prototype of the proposed converter with input and output voltages of 900 V and 150 V, respectively and the rated output power of 2 kW to demonstrate the validity of the analysis and design.INDEX TERMS LLC resonant converter, switched capacitor, embedded filter, high-voltage application, soft switching, hybrid converter, solid-state transformer, DC transformer (DCX).

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Optimal‐droop voltage‐restorer for zonal dc distribution system with simultaneous consideration of dynamic current balance and power loss reduction

Han,

Zhou,

Lin

et al. 2024

IET Power Electronics

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A dc voltage restorer (dc‐VR) with optimal droop control is developed to reduce the power loss and solve the dynamic current imbalance simultaneously of the zonal dc distribution system integrating multi‐parallel energy storage. Firstly, the power loss model composed of line loss and converter loss is built and it is proved to be a strictly convex function with respect to droop coefficients, which indicates the power loss can be mitigated by optimizing the current distribution. Thus, an image‐based droop optimization method is proposed to search for the optimal droop coefficients. Then, the economy of voltage compensation on power loss reduction is investigated and an ESS‐combined dc‐VR is designed, including an interleaved parallel architecture and a capacitor‐integrated electric spring (C‐ES). Unified virtual inertia is proposed for interleaved parallel bridge arms to make their dynamic performance consistent. And the newly introduced C‐ES can keep the bus voltage at the rated level to reduce the system cost. Therefore, the problem of dynamic currents imbalance is addressed from the points of converter structure (dc‐VR) and control system (unified inertia), and the power loss can be reduced by voltage recovery (C‐ES) and optimizing the current reallocation which is achieved by updating sharing coefficients from the image‐based droop optimization method. Finally, the simulation cases validate the effectiveness of the proposed optimal‐droop dc‐VR on dynamic current balance and power loss reduction, and hardware in the loop experiment results prove the consistent dynamic characteristics of the dc‐VR's arms.

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A Distributed Multimode Control Strategy for the Cascaded DC–DC Converter Applied to MVAC Grid-Tied PV System

Cited by 9 publications

References 32 publications

Differential Power Processing Converter With Active Clamp Structure and Integrated Planar Transformer for Power Generation Optimization of Multiple Photovoltaic Submodules

Differential Power Processing Converter With Active Clamp Structure and Integrated Planar Transformer for Power Generation Optimization of Multiple Photovoltaic Submodules

Multilevel Switched Capacitor LLC-DCX Converter With Embedded Filter

Optimal‐droop voltage‐restorer for zonal dc distribution system with simultaneous consideration of dynamic current balance and power loss reduction

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