The design of cascaded DC-DC converters with single-switch PWM and PFM for standalone PV power applications

Junkai Zhao; Herbert H.C. Iu; Tyrone Fernando

doi:10.1109/IFEEC.2017.7992429

The design of cascaded DC-DC converters with single-switch PWM and PFM for standalone PV power applications

Junkai Zhao, Herbert H.C. Iu, Tyrone Fernando

Research output: Chapter in Book/Conference paper › Conference paper › peer-review

7 Citations (Scopus)

Abstract

This paper proposes a design of cascaded DC-DC converters for transferring energy from solar panels to loads in standalone cases. The storage units are connected to the proposed system via the converters to solve the instability of the renewable power source. The voltage levels of the power supply, storage and the load are different to each other in the design. Single-switch simplification is utilised to reduce the number of switches in the topology. The control circuit of the system is developed based on the conventional cascaded converters. Resettable integrators are introduced in the control circuit to perform Pulse Frequency Modulation (PFM) to regulate one of the converters. The ramp signal from the integrator is used to achieve Pulse Width Modulation (PWM) simultaneously. The advantages of the proposed design include the fewer components, the smaller size and more control freedom than the conventional converters for PV power system. In this paper, the design process of the proposed converters is introduced with the operation principles in different situations. Moreover, the design of the control circuit is illustrated as well as the operation of PWM and PFM. Last, the proposed design is verified by the simulation and experimental results.

Original language	English
Title of host publication	2017 IEEE 3rd International Future Energy Electronics Conference and ECCE Asia, IFEEC - ECCE Asia 2017
Publisher	IEEE, Institute of Electrical and Electronics Engineers
Pages	122-126
Number of pages	5
ISBN (Electronic)	9781509051571
DOIs	https://doi.org/10.1109/IFEEC.2017.7992429
Publication status	Published - 25 Jul 2017
Event	3rd IEEE International Future Energy Electronics Conference and ECCE Asia, IFEEC - ECCE Asia 2017 - Kaohsiung, Taiwan, Province of China Duration: 3 Jun 2017 → 7 Jun 2017

Conference

Conference	3rd IEEE International Future Energy Electronics Conference and ECCE Asia, IFEEC - ECCE Asia 2017
Country/Territory	Taiwan, Province of China
City	Kaohsiung
Period	3/06/17 → 7/06/17

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1109/IFEEC.2017.7992429

Cite this

Zhao, J., Iu, H. H. C., & Fernando, T. (2017). The design of cascaded DC-DC converters with single-switch PWM and PFM for standalone PV power applications. In 2017 IEEE 3rd International Future Energy Electronics Conference and ECCE Asia, IFEEC - ECCE Asia 2017 (pp. 122-126). [7992429] IEEE, Institute of Electrical and Electronics Engineers. https://doi.org/10.1109/IFEEC.2017.7992429

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title = "The design of cascaded DC-DC converters with single-switch PWM and PFM for standalone PV power applications",

abstract = "This paper proposes a design of cascaded DC-DC converters for transferring energy from solar panels to loads in standalone cases. The storage units are connected to the proposed system via the converters to solve the instability of the renewable power source. The voltage levels of the power supply, storage and the load are different to each other in the design. Single-switch simplification is utilised to reduce the number of switches in the topology. The control circuit of the system is developed based on the conventional cascaded converters. Resettable integrators are introduced in the control circuit to perform Pulse Frequency Modulation (PFM) to regulate one of the converters. The ramp signal from the integrator is used to achieve Pulse Width Modulation (PWM) simultaneously. The advantages of the proposed design include the fewer components, the smaller size and more control freedom than the conventional converters for PV power system. In this paper, the design process of the proposed converters is introduced with the operation principles in different situations. Moreover, the design of the control circuit is illustrated as well as the operation of PWM and PFM. Last, the proposed design is verified by the simulation and experimental results.",

keywords = "Cascaded DC-DC converters, Photovoltaic power system, Pulse Frequency Modulation, Pulse Width Modulation (PFM), Resettable integrator, Single-switch technique, Stand-alone solar panel system",

author = "Junkai Zhao and Iu, {Herbert H.C.} and Tyrone Fernando",

year = "2017",

month = jul,

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doi = "10.1109/IFEEC.2017.7992429",

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booktitle = "2017 IEEE 3rd International Future Energy Electronics Conference and ECCE Asia, IFEEC - ECCE Asia 2017",

publisher = "IEEE, Institute of Electrical and Electronics Engineers",

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note = "3rd IEEE International Future Energy Electronics Conference and ECCE Asia, IFEEC - ECCE Asia 2017 ; Conference date: 03-06-2017 Through 07-06-2017",

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Zhao, J, Iu, HHC & Fernando, T 2017, The design of cascaded DC-DC converters with single-switch PWM and PFM for standalone PV power applications. in 2017 IEEE 3rd International Future Energy Electronics Conference and ECCE Asia, IFEEC - ECCE Asia 2017., 7992429, IEEE, Institute of Electrical and Electronics Engineers, pp. 122-126, 3rd IEEE International Future Energy Electronics Conference and ECCE Asia, IFEEC - ECCE Asia 2017, Kaohsiung, Taiwan, Province of China, 3/06/17. https://doi.org/10.1109/IFEEC.2017.7992429

The design of cascaded DC-DC converters with single-switch PWM and PFM for standalone PV power applications. / Zhao, Junkai; Iu, Herbert H.C.; Fernando, Tyrone.
2017 IEEE 3rd International Future Energy Electronics Conference and ECCE Asia, IFEEC - ECCE Asia 2017. IEEE, Institute of Electrical and Electronics Engineers, 2017. p. 122-126 7992429.

Research output: Chapter in Book/Conference paper › Conference paper › peer-review

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T1 - The design of cascaded DC-DC converters with single-switch PWM and PFM for standalone PV power applications

AU - Zhao, Junkai

AU - Iu, Herbert H.C.

AU - Fernando, Tyrone

PY - 2017/7/25

Y1 - 2017/7/25

N2 - This paper proposes a design of cascaded DC-DC converters for transferring energy from solar panels to loads in standalone cases. The storage units are connected to the proposed system via the converters to solve the instability of the renewable power source. The voltage levels of the power supply, storage and the load are different to each other in the design. Single-switch simplification is utilised to reduce the number of switches in the topology. The control circuit of the system is developed based on the conventional cascaded converters. Resettable integrators are introduced in the control circuit to perform Pulse Frequency Modulation (PFM) to regulate one of the converters. The ramp signal from the integrator is used to achieve Pulse Width Modulation (PWM) simultaneously. The advantages of the proposed design include the fewer components, the smaller size and more control freedom than the conventional converters for PV power system. In this paper, the design process of the proposed converters is introduced with the operation principles in different situations. Moreover, the design of the control circuit is illustrated as well as the operation of PWM and PFM. Last, the proposed design is verified by the simulation and experimental results.

AB - This paper proposes a design of cascaded DC-DC converters for transferring energy from solar panels to loads in standalone cases. The storage units are connected to the proposed system via the converters to solve the instability of the renewable power source. The voltage levels of the power supply, storage and the load are different to each other in the design. Single-switch simplification is utilised to reduce the number of switches in the topology. The control circuit of the system is developed based on the conventional cascaded converters. Resettable integrators are introduced in the control circuit to perform Pulse Frequency Modulation (PFM) to regulate one of the converters. The ramp signal from the integrator is used to achieve Pulse Width Modulation (PWM) simultaneously. The advantages of the proposed design include the fewer components, the smaller size and more control freedom than the conventional converters for PV power system. In this paper, the design process of the proposed converters is introduced with the operation principles in different situations. Moreover, the design of the control circuit is illustrated as well as the operation of PWM and PFM. Last, the proposed design is verified by the simulation and experimental results.

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KW - Pulse Width Modulation (PFM)

KW - Resettable integrator

KW - Single-switch technique

KW - Stand-alone solar panel system

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EP - 126

BT - 2017 IEEE 3rd International Future Energy Electronics Conference and ECCE Asia, IFEEC - ECCE Asia 2017

PB - IEEE, Institute of Electrical and Electronics Engineers

T2 - 3rd IEEE International Future Energy Electronics Conference and ECCE Asia, IFEEC - ECCE Asia 2017

Y2 - 3 June 2017 through 7 June 2017

ER -

The design of cascaded DC-DC converters with single-switch PWM and PFM for standalone PV power applications

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