51. A Virtual Impedance Based Control Scheme for Modular Electrolytic Capacitor-Less Second Harmonic Current Compensator.
- Author
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Huang, Xinze, Ruan, Xinbo, Fang, Jie, and Kan, Shiqi
- Subjects
IMPEDANCE control ,ELECTROLYTIC capacitors ,AC DC transformers ,CAPACITORS ,CORRECTION factors ,BUSES ,VOLTAGE control - Abstract
The second harmonic current compensator (SHCC) can be added into the single-phase converters for compensating the second harmonic current (SHC) and thus removing the undesired electrolytic capacitor. In this paper, a virtual impedance, which is in the form of a capacitor and a resistor connected in parallel, is introduced to be in parallel at the bus-side port of the SHCC for effectively compensating the SHC while guaranteeing the system stability. This virtual parallel impedance is realized by feeding forward the bus-side port voltage of the SHCC, and thus the SHCC can be modular designed. The closed-loop parameter design of the SHCC is also presented. A 3.3-kW prototype of a two-stage single-phase power factor correction converter is built and tested in the laboratory, and the experimental results verify the effectiveness and feasibility of the proposed control method. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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