期刊
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
卷 10, 期 3, 页码 3087-3099出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JESTPE.2021.3132258
关键词
Harmonic compensation; improvement of harmonic tolerance; series inverter; series reactor; shunt capacitor
资金
- Japan Power Academy
This article focuses on the harmonic filtering and voltage tolerance of the active shunt capacitor (SC) with series inverter. A novel control system is proposed to adjust the equivalent admittance of the active SC for harmonic filtering and overload protection. Experimental results demonstrate the effective performance of the active SC under various conditions.
Conventional shunt capacitors (SCs) with series reactor can filter the harmonic currents generated by the load in addition to improving the power factor. However, a trade-off exists between the harmonic filtering effect and the harmonic voltage tolerance because its admittance is fixed. This article focuses on the SC with series inverter (active SC) and proposes a novel control system to satisfy both the harmonic filtering effect and the harmonic voltage tolerance. The proposed control system adjusts the equivalent admittance of the active SC according to the grid harmonic voltage. The active SC contributes to the harmonic compensation in normal condition. When the harmonic voltage rises excessively, it protects itself from the overload. Theoretical analysis reveals that the dc voltage of the inverter can be as low as 10% of the rated grid voltage. Experimental results verify that the active SC can filter a harmonic current as high as 50% of its rated current, and tolerate a harmonic voltage around two times higher than the conventional SC with series reactor. Moreover, it is verified that the active SC can operate properly under unbalanced grid voltage and transients of harmonic voltages.
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