Accurate s-Domain PWM Model for Stability Analysis of LCL-filtered VSC

Yangwen Wang; Zheming Jin; Xiongfei Wang

doi:10.1109/IPEMC-ECCEAsia48364.2020.9367724

Accurate s-Domain PWM Model for Stability Analysis of LCL-filtered VSC

Yangwen Wang, Zheming Jin, Xiongfei Wang

Research output: Contribution to book/anthology/report/conference proceeding › Article in proceeding › Research › peer-review

Abstract

The pulse width modulation (PWM) is widely used with power electronic converters. To study the control dynamics of power converters, the accurate modeling of PWM is necessary. Currently, the common practice of modeling PWM is to consider it as a zero-order-hold (ZOH) block or time delay. In this case, the comparator process is simplified as a unity gain, which leads to an inaccurate modeling. In this paper, an accurate s-domain PWM model is proposed by studying the comparator process in detail. To validate the proposed model, a case study of current control for an LCL-filtered voltage source converter is presented. The analytical results show that, by using the conventional ZOH model and the proposed model, the critical conditions for a stable current control are different. It is validated by the experimental results that the proposed model can precisely predict the stability condition, while the ZOH model loses its accuracy.

Original language	English
Title of host publication	2020 IEEE 9th International Power Electronics and Motion Control Conference, IPEMC 2020 ECCE Asia
Number of pages	6
Publisher	IEEE
Publication date	9 Mar 2021
Pages	1367-1372
Article number	9367724
ISBN (Print)	978-1-7281-5302-5
ISBN (Electronic)	978-1-7281-5301-8
DOIs	https://doi.org/10.1109/IPEMC-ECCEAsia48364.2020.9367724
Publication status	Published - 9 Mar 2021
Event	9th IEEE International Power Electronics and Motion Control Conference, IPEMC 2020 ECCE Asia - Nanjing, China Duration: 29 Nov 2020 → 2 Dec 2020

Conference

Conference	9th IEEE International Power Electronics and Motion Control Conference, IPEMC 2020 ECCE Asia
Country/Territory	China
City	Nanjing
Period	29/11/2020 → 02/12/2020

Series	2020 IEEE 9th International Power Electronics and Motion Control Conference, IPEMC 2020 ECCE Asia

Bibliographical note

Publisher Copyright:
© 2020 IEEE.

Copyright:
Copyright 2021 Elsevier B.V., All rights reserved.

Keywords

comparator process
current control
PWM model
sampling process

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10.1109/IPEMC-ECCEAsia48364.2020.9367724

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title = "Accurate s-Domain PWM Model for Stability Analysis of LCL-filtered VSC",

abstract = "The pulse width modulation (PWM) is widely used with power electronic converters. To study the control dynamics of power converters, the accurate modeling of PWM is necessary. Currently, the common practice of modeling PWM is to consider it as a zero-order-hold (ZOH) block or time delay. In this case, the comparator process is simplified as a unity gain, which leads to an inaccurate modeling. In this paper, an accurate s-domain PWM model is proposed by studying the comparator process in detail. To validate the proposed model, a case study of current control for an LCL-filtered voltage source converter is presented. The analytical results show that, by using the conventional ZOH model and the proposed model, the critical conditions for a stable current control are different. It is validated by the experimental results that the proposed model can precisely predict the stability condition, while the ZOH model loses its accuracy.",

keywords = "comparator process, current control, PWM model, sampling process",

author = "Yangwen Wang and Zheming Jin and Xiongfei Wang",

note = "Publisher Copyright: {\textcopyright} 2020 IEEE. Copyright: Copyright 2021 Elsevier B.V., All rights reserved.; 9th IEEE International Power Electronics and Motion Control Conference, IPEMC 2020 ECCE Asia ; Conference date: 29-11-2020 Through 02-12-2020",

year = "2021",

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doi = "10.1109/IPEMC-ECCEAsia48364.2020.9367724",

language = "English",

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series = "2020 IEEE 9th International Power Electronics and Motion Control Conference, IPEMC 2020 ECCE Asia",

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publisher = "IEEE",

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Wang, Y, Jin, Z & Wang, X 2021, Accurate s-Domain PWM Model for Stability Analysis of LCL-filtered VSC. in 2020 IEEE 9th International Power Electronics and Motion Control Conference, IPEMC 2020 ECCE Asia., 9367724, IEEE, 2020 IEEE 9th International Power Electronics and Motion Control Conference, IPEMC 2020 ECCE Asia, pp. 1367-1372, 9th IEEE International Power Electronics and Motion Control Conference, IPEMC 2020 ECCE Asia, Nanjing, China, 29/11/2020. https://doi.org/10.1109/IPEMC-ECCEAsia48364.2020.9367724

Accurate s-Domain PWM Model for Stability Analysis of LCL-filtered VSC. / Wang, Yangwen; Jin, Zheming; Wang, Xiongfei.
2020 IEEE 9th International Power Electronics and Motion Control Conference, IPEMC 2020 ECCE Asia. IEEE, 2021. p. 1367-1372 9367724 (2020 IEEE 9th International Power Electronics and Motion Control Conference, IPEMC 2020 ECCE Asia).

Research output: Contribution to book/anthology/report/conference proceeding › Article in proceeding › Research › peer-review

TY - GEN

T1 - Accurate s-Domain PWM Model for Stability Analysis of LCL-filtered VSC

AU - Wang, Yangwen

AU - Jin, Zheming

AU - Wang, Xiongfei

PY - 2021/3/9

Y1 - 2021/3/9

N2 - The pulse width modulation (PWM) is widely used with power electronic converters. To study the control dynamics of power converters, the accurate modeling of PWM is necessary. Currently, the common practice of modeling PWM is to consider it as a zero-order-hold (ZOH) block or time delay. In this case, the comparator process is simplified as a unity gain, which leads to an inaccurate modeling. In this paper, an accurate s-domain PWM model is proposed by studying the comparator process in detail. To validate the proposed model, a case study of current control for an LCL-filtered voltage source converter is presented. The analytical results show that, by using the conventional ZOH model and the proposed model, the critical conditions for a stable current control are different. It is validated by the experimental results that the proposed model can precisely predict the stability condition, while the ZOH model loses its accuracy.

AB - The pulse width modulation (PWM) is widely used with power electronic converters. To study the control dynamics of power converters, the accurate modeling of PWM is necessary. Currently, the common practice of modeling PWM is to consider it as a zero-order-hold (ZOH) block or time delay. In this case, the comparator process is simplified as a unity gain, which leads to an inaccurate modeling. In this paper, an accurate s-domain PWM model is proposed by studying the comparator process in detail. To validate the proposed model, a case study of current control for an LCL-filtered voltage source converter is presented. The analytical results show that, by using the conventional ZOH model and the proposed model, the critical conditions for a stable current control are different. It is validated by the experimental results that the proposed model can precisely predict the stability condition, while the ZOH model loses its accuracy.

KW - comparator process

KW - current control

KW - PWM model

KW - sampling process

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PB - IEEE

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Wang Y, Jin Z, Wang X. Accurate s-Domain PWM Model for Stability Analysis of LCL-filtered VSC. In 2020 IEEE 9th International Power Electronics and Motion Control Conference, IPEMC 2020 ECCE Asia. IEEE. 2021. p. 1367-1372. 9367724. (2020 IEEE 9th International Power Electronics and Motion Control Conference, IPEMC 2020 ECCE Asia). doi: 10.1109/IPEMC-ECCEAsia48364.2020.9367724

Accurate s-Domain PWM Model for Stability Analysis of LCL-filtered VSC

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Keywords

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