A Photovoltaic Array Transformer-Less Inverter With Film Capacitors and Silicon Carbide Transistors

Breazeale, Lloyd; Ayyanar, Raja

doi:10.1109/tpel.2014.2321760

Cited by 84 publications

(36 citation statements)

References 19 publications

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“…In many references, a 25% ripple is allowed in the main DC link. In this case, the capacitance could be reduced to a smaller value [1].…”

Section: B Proposed Circuit and Designmentioning

confidence: 99%

“…Aluminum electrolyte capacitors as a DC-link are a source of life-time reduction in DC/AC inverter due to the small life-time and low reliability of these capacitors. Using film capacitor would increase the life-time and reliability of the circuit [1]. Furthermore, due to safety in residential renewable energy applications, especially in rooftop PV systems, there is a need for using low input DC voltage for the PV converters.…”

Section: Introductionmentioning

confidence: 99%

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A cascaded-boost topology for electrolyte-less power conditioning system suitable for PV residential applications

Ahmed

Irfan

Park

2015

2015 9th International Conference on Power Electronics and ECCE Asia (ICPE-ECCE Asia)

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Single-phase inverters need large bulk DC link electrolyte capacitors which reduce the life time of the converter circuit. Furthermore, there is a safety need for low input voltage in photovoltaic (PV) residential applications. A new cascaded power-decoupling topology is proposed in this paper with film capacitors and high step-up ratio. The topology is based on cascaded double boost; the output of the source side boost (the auxiliary DC link) is free to oscillate in double frequency of the AC output around a controlled average voltage. Besides, the second boost controls the main DC-link voltage within a demanded ripple range. A detailed design procedure of the topology is proposed, followed by transient analysis and controller design. Finally, the proposed circuit will be verified by simulation and experimental results.Index Terms-Cascaded boost, electrolytic-less, power conditioning, photovoltaic.

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“…In many references, a 25% ripple is allowed in the main DC link. In this case, the capacitance could be reduced to a smaller value [1].…”

Section: B Proposed Circuit and Designmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A cascaded-boost topology for electrolyte-less power conditioning system suitable for PV residential applications

Ahmed

Irfan

Park

2015

2015 9th International Conference on Power Electronics and ECCE Asia (ICPE-ECCE Asia)

View full text Add to dashboard Cite

show abstract

“…Instead of such combination of solutions, it is, of course, better to achieve the reduction of both leakage current and capacitance together in a holistic way. For example, the midpoints of a split-phase single-phase system at both the DC and AC sides are constructed and connected together in [13] to eliminate the isolating transformer and bulky electrolytic capacitors with six switches. Another example [14] was reported for asymmetrical single-phase systems, which needs four switches.…”

Section: Introductionmentioning

confidence: 99%

“…Another example [14] was reported for asymmetrical single-phase systems, which needs four switches. As a result, two switches are saved compared to the converter in [13]. The only compromise is that the converter presented in [14] needs switches with higher voltagerating, which leads to increased system costs and losses.…”

Section: Introductionmentioning

confidence: 99%

Beijing Converters: Bridge Converters With a Capacitor Added to Reduce Leakage Currents, DC-Bus Voltage Ripples, and Total Capacitance Required

Zhong

Ming

Sheng

et al. 2017

IEEE Trans. Ind. Electron.

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Isolation transformers and bulky electrolytic capacitors are often used in power electronic converters to reduce leakage currents and voltage ripples but this leads to low power density and reduced reliability. In this paper, an auxiliary capacitor is added to the widely-used conventional full-bridge converter to provide a path for, and hence significantly reduce, the leakage current. The operation of the full-bridge converter is split into the operation of a halfbridge converter and a DC-DC converter so that the ripple energy can be diverted from the DC-bus capacitor to the auxiliary capacitor. Hence, the DC-bus capacitor can be significantly reduced while maintaining very low voltage ripples on the DC bus because it is only required to filter out switching ripples. The auxiliary capacitor is designed to allow high voltage ripples because its voltage is not supplied to any load. Accordingly, the auxiliary capacitor can also be very small as well. As a result, the total required capacitance becomes very small. The reduction ratio of the total capacitance is significant, which makes it costeffective to use film capacitors instead of electrolytic capacitors. The proposed converters can be also operated as an inverter without any restriction on power factor because the adopted four switches are all bidirectional in terms of power flow. Experimental results for both rectification and inversion modes are presented to demonstrate the performance of the proposed converter in reducing the ripples, the leakage currents and the total capacitance needed, with comparison to the conventional bridge converter without the auxiliary capacitor.

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“…A better way is to address these two problems in a holistic way. For example, the midpoints of a split-phase single-phase system at both the DC and AC sides are constructed and connected together in [15] to eliminate the isolating transformer and bulky electrolytic capacitors with six active switches.…”

Section: Introductionmentioning

confidence: 99%

Current-Stress Reduction for the Neutral Inductor of $\theta$ -Converters

Ming

Zhong

2017

IEEE Trans. Power Electron.

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Following the recently proposed θ-converter that reduces voltage ripples, leakage currents and total capacitance required in a single-phase converter, this paper further improves the θ-converter by reducing the current stress of the neutral inductor, by relocating it to the DC side without affecting the other functions of the θ-converter. Based on the average circuit model of the proposed converter, it is found that the current flowing through the neutral inductor can be reduced by at least three times and hence, the size of the inductor can be reduced by at least nine times. How to operate the converter to achieve the reduction of the current stress is discussed in detail. Moreover, the selection criteria on the neutral inductor and other passive components used in the proposed converter are discussed in order to minimise their usage. Intensive experimental results are presented to demonstrate that the proposed converter can indeed reduce the current-stress while the other functions of the θ-converter are not affected.

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A Photovoltaic Array Transformer-Less Inverter With Film Capacitors and Silicon Carbide Transistors

Cited by 84 publications

References 19 publications

A cascaded-boost topology for electrolyte-less power conditioning system suitable for PV residential applications

A cascaded-boost topology for electrolyte-less power conditioning system suitable for PV residential applications

Beijing Converters: Bridge Converters With a Capacitor Added to Reduce Leakage Currents, DC-Bus Voltage Ripples, and Total Capacitance Required

Current-Stress Reduction for the Neutral Inductor of $\theta$ -Converters

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