Partial Unfolding Scheme for Grid Feeding Transformerless PV Inverter

Kumar, Rustam; Rajaput, Madhurani; Deshmukh, Nachiketa; More, D. S.; Anand, Sandeep

doi:10.1109/pedes.2018.8707472

Cited by 2 publications

(4 citation statements)

References 18 publications

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“…One of the earliest distinct attempts to achieve power partiality with unfolders is reported in [29,30]. The papers present a two-stage two-level voltage-sourced inverter for PVs that adds the variable voltage from the pulse mode circuit to the constant voltage of PV.…”

Section: Approaches To Loss Reductionmentioning

confidence: 99%

“…Paper [32] and patent [33] present a two-stage inverter, which combines the true PPC principle with a pulsating DC-bus and unfolding frontend. This work utilizes a series input-parallel output (SIPO) PPC scheme and, like [29,30], is intended for PV interfacing. These documents provide a feasible study of SIPO PPC with the UF inverter and DC allocation of the current firming inductor.…”

Section: Approaches To Loss Reductionmentioning

confidence: 99%

“…The essence of this work follows from the mismatch of the above-discussed solutions [29][30][31][32][33] from considering the application or principle of the true partiality of power conversion. Its main contribution includes the development of a novel BESS power interface and corresponding control, as well as their evaluation from the point of view of energy efficiency and parameters of the switches.…”

Section: Approaches To Loss Reductionmentioning

confidence: 99%

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Considerations on Combining Unfolding Inverters with Partial Power Regulators in Battery–Grid Interface Converters

Galkin,

Saltanovs,

Bubovich

et al. 2024

Energies

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The application of electrochemical cells as a source unit of electrical energy is rapidly growing—used in electric vehicles and other electric mobility devices, as well as in energy supply systems—as energy storage, often together with renewable energy sources. The key element of such systems is the power electronic converter used for DC energy storage and AC grid interfacing. It should be bidirectional to charge and discharge the battery when it is necessary. Two-stage battery interface converters are the most common; their DC-DC stage controls the battery current and adjusts voltage, but the DC-AC stage (inverter or frontend) controls the current in the grid. The use of unfolding inverters in two-stage battery interfaces can have some advantages. In this case, the DC-DC converter produces half-sinewave pulsating voltages and currents, but the unfolding circuit changes the polarity of the voltages and currents and produces no switching losses. Another trend of modern power electronics is the principle of partial power processing. In this case, power electronic converters deal only with a part of the total power; therefore, losses in such converters are reduced. This paper considers combining unfolding frontends with partial power DC-DC converters that enable the further reduction in losses. In this paper, it is shown that such implementation of the partial power conversion principle in semi-DC-AC systems is really possible based on the real-time matching of the voltage of the partial-power DC-DC converter, battery voltage (which depends on its state of charge) and the rectified instantaneous voltage of the AC grid.

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Section: Approaches To Loss Reductionmentioning

confidence: 99%

Section: Approaches To Loss Reductionmentioning

confidence: 99%

Section: Approaches To Loss Reductionmentioning

confidence: 99%

See 1 more Smart Citation

Considerations on Combining Unfolding Inverters with Partial Power Regulators in Battery–Grid Interface Converters

Galkin,

Saltanovs,

Bubovich

et al. 2024

Energies

View full text Add to dashboard Cite

show abstract

“…In addition, the progress of power electronics has revealed a great possibility and potential for integration of renewable energy systems with grid . For a PV system operating in a grid‐connected environment, there are three different modes of operation: grid‐forming, grid‐feeding, and grid‐supporting . In general, the off‐grid PV systems deal with the grid‐forming mode, whereas in the grid feeding mode, the PV inverter delivers power to the grid by acting as an ideal current source.…”

Section: Introductionmentioning

confidence: 99%

Coordinated reactive power strategy using static synchronous compensator for photovoltaic inverters

Fatama

Khan

Kurukuru

et al. 2020

Int Trans Electr Energ Syst

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Summary Large photovoltaic (PV) penetrations into the electric grid resulted in new challenges such as reverse power flow and violation of voltage profile. The traditional methods for voltage regulation in a grid‐connected PV system are hardly adaptable to these changes as they only contain the local information which is used without the knowledge of how the control action affects the overall system. To address this problem, this paper extends the reactive power control capability of solar PV inverters by combining them with static power electronic devices for regulating voltage during grid faults. For efficient identification of grid faults, a support vector machine‐based fault classification mechanism is developed. The proposed method prioritizes the reactive power control using PV inverter by adapting a predefined hierarchical control structure. The complete methodology is realized by testing it with a two‐stage single‐phase grid‐connected PV system. The experimental results verify the accuracy of the classification algorithm and depict the effectiveness of the proposed controller in both under and overvoltage situations.

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Partial Unfolding Scheme for Grid Feeding Transformerless PV Inverter

Cited by 2 publications

References 18 publications

Considerations on Combining Unfolding Inverters with Partial Power Regulators in Battery–Grid Interface Converters

Considerations on Combining Unfolding Inverters with Partial Power Regulators in Battery–Grid Interface Converters

Coordinated reactive power strategy using static synchronous compensator for photovoltaic inverters

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