Modified T-Type Three-Level AC-DC Converter Based Multifunctional Compensator for Three-Phase AC Power System With Low-Frequency Pulsed Load

In order to achieve an efficient pulsed power compensation for the ac-sourced pulsed power system, a multifunctional compensator (MFC) of modified T-type semi-two-stage converter is proposed in this article. The power decoupling capacitor is in parallel with one of the dividing capacitors of the thr...

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Bibliographic Details
Published in:IEEE transactions on industrial electronics (1982) 2022-12, Vol.69 (12), p.11844-11855
Main Authors: Zhu, Jianxin, Wu, Hongfei, Li, Lin, Wang, Jiangfeng, Hua, Ming, Xing, Yan
Format: Article
Language:English
Subjects:
AC-DC converters
Active filters
Capacitors
Carrier-based pulsewidth modulation (CBPWM)
Circuits
Compensation
Compensators
Control methods
Decoupling
Dynamic response
Electric potential
Electric power systems
Feedforward control
Harmonic analysis
Inverters
Low pass filters
Power flow
Power harmonic filters
power quality
Power rating
Power systems
pulsed power decoupling
Rectifiers
semi-two-stage ac-dc converter
Voltage
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Summary:In order to achieve an efficient pulsed power compensation for the ac-sourced pulsed power system, a multifunctional compensator (MFC) of modified T-type semi-two-stage converter is proposed in this article. The power decoupling capacitor is in parallel with one of the dividing capacitors of the three-level ac/dc converter, so that the voltage of decoupling capacitor is able to vary in a very wide range without increasing the voltage stress of the converter. The semi-two-stage compensator achieves better compensation performance and less decoupling capacitor than the single-stage circuit while having higher efficiency and lower converter power rating than the two-stage solution. Operating principles of the semi-two stage MFC are analyzed in detail, and a modulation strategy is presented to achieve two-path power flow between the decoupling capacitor and ac power system. In order to improve the dynamic response of the MFC during the transition between different pulse frequency loads, a power-difference feed-forward control and a dual low-pass filter control are proposed for the compensation. A prototype is built and tested to verify the effectiveness and feasibility of the proposed MFC and control methods.
ISSN:0278-0046
1557-9948
DOI:10.1109/TIE.2021.3130322