A regenerative active clamp circuit for DC/AC converters with high-frequency isolation in photovoltaic systems

Rocabert, Joan; Dumenjo, M.M.; Bordonau, J.; Jiménez, José Antonio Beristáin

doi:10.1109/pesc.2004.1355439

Cited by 16 publications

(4 citation statements)

References 16 publications

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“…As such voltage is applied to the magnetizing inductance, it appears on the secondary side. To limit the voltage during open load operation, a voltage clamper [36] can be put at the secondary, as Figure 12 shows.…”

Section: A Voltage Clampermentioning

confidence: 99%

Overvoltage Protection for High Frequency High Voltage Power Transformers

Souza¹,

Valverde²,

Pomílio³

2019

Eletrônica de Potência

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Transformers with high-voltage operation may have undesired behavior due to the effects of their parasitic elements. In power electronics applications, if the primary voltage has harmonics, transformer resonances may be excited, causing high primary currents and secondary voltage stress, compromising the device isolation. This behavior is quite dangerous if the transformer operates without load, what means, without damping, because in this situation, the secondary voltage peak can reach more than two times the expected (rated) value. To protect the high frequency high voltage transformer against this dangerous operation, the overvoltage problem in open load condition is carefully explored and explained in this paper, with the proposition of different protection strategies to mitigate its effect, depending on the transformer parasitic elements values. The different strategies are analytically explained and validated by experimental results, showing their criteria design and effectiveness for the protection of high frequency high voltage transformers through the analysis of a 1 kVA, 311V, 20 kHz, 42/512 ferrite core transformer, showing its dynamics working alone and with each protection strategy.

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Section: A Voltage Clampermentioning

confidence: 99%

Overvoltage Protection for High Frequency High Voltage Power Transformers

Souza¹,

Valverde²,

Pomílio³

2019

Eletrônica de Potência

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“…The transformation of amplitude or polarity of DC voltage is called DC/DC transformation. DC/DC transformation is mainly used in such three situations: changing the direct-current electricity making by solar cells into the voltage level which is necessary to inversion bus bar [4], administration of charging battery [5], transforming the direct-current electricity of PV array into the voltage level which is necessary to local direct loads [6].…”

Section: Advanced Materials Research Vols 542-543mentioning

confidence: 99%

An Overview of Grid-Connected Photovoltaic Power Generating System

Zhou

Jie

2012

AMR

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With the traditional energy exhausting rapidly, the development of new sustainable energy especially solar energy has a significant meaning. The paper mainly introduces some characteristics of photovoltaic (PV) power generation system involving in its development, construction and key technology. Solar cells can supply power energy through absorbing sunlight. As a result, some key technologies such as maximum power point tracking (MPPT), islanding detection and energy conversion are concerned by many investigators. Finally, this review gives some conclusion and prospective of PV power system.

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“…The CHFL is commonly utilized in standalone photovoltaic systems that require a high level of efficiency to offset the low efficiency of photovoltaic panels (Rocabert et al, 2004). In a previous work (Aganza-Torres and Cárdenas, 2011) a high-frequency link inverter with a multiple carrier modulation scheme for low-power (RES) applications was presented.…”

Section: Introductionmentioning

confidence: 99%

Soft switching modulation strategy based on bipolar (PSM) with improved efficiency in high-frequency link inverters

Ali,

Su,

Yang

et al. 2023

Front. Energy Res.

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High Frequency-Link (HFL) Inverters have been employed to integrate renewable energy sources into utility grids and electric vehicles. The soft-switching range of High-Frequency Link Inverters (HFLI) is increased using auxiliary inductors and capacitors. The application of auxiliary components increases the conduction loss and the complexity of the circuit. The literature indicates that the existing soft-switching methods suffer from higher duty cycle loss, voltage spikes, and lower efficiency owing to the resonance between the parasitic capacitance of switches and the leakage inductance of the transformer. Therefore, it is imperative to develop a modulation strategy that can improve the efficiency of HFLI. In this context, the proposed study develops a cycloconverter-type High-Frequency Link Inverter (CHFLI) based on a Bipolar Phase Shift Modulation (BPSM) strategy without the use of auxiliary components. The proposed modulation strategy enables the semiconductor switches to operate under zero voltage switching. The full-bridge inverter and Full Bridge Active Clamper Circuit (FBAC) switches operate at the same gating signals with a constant duty cycle of 50%. The proposed topology uses built-in magnetizing inductance to achieve zero voltage switching and reduce the duty cycle loss. The leakage energy is recycled from the output filter inductor to the load side using the FBAC. The results indicate that the proposed modulation strategy achieves ZVS and simultaneously achieves an efficiency of 95%. The proposed modulation strategy is easy to implement and does not require complex circuitry.

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A regenerative active clamp circuit for DC/AC converters with high-frequency isolation in photovoltaic systems

Cited by 16 publications

References 16 publications

Overvoltage Protection for High Frequency High Voltage Power Transformers

Overvoltage Protection for High Frequency High Voltage Power Transformers

An Overview of Grid-Connected Photovoltaic Power Generating System

Soft switching modulation strategy based on bipolar (PSM) with improved efficiency in high-frequency link inverters

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