Impact of Switching Harmonics on Capacitor Cells Balancing in Phase-Shifted PWM-Based Cascaded H-Bridge STATCOM

被引：59

作者：

Behrouzian, Ehsan ^{[1
]}

Bongiorno, Massimo ^{[1
]}

Teodorescu, Remus ^{[1
,2
]}

机构：

[1] Chalmers Univ Technol, Div Elect Power Engn, Dept Energy & Environm, SE-41296 Gothenburg, Sweden

[2] Aalborg Univ, Dept Energy Technol, DK-9220 Aalborg, Denmark

来源：

IEEE TRANSACTIONS ON POWER ELECTRONICS | 2017年 / 32卷 / 01期

关键词：

Cascade systems; harmonic analysis; multilevel systems; pulse width modulation; reactive power control; static VAR compensators; MULTILEVEL; PERFORMANCE; STRATEGIES;

D O I：

10.1109/TPEL.2016.2535481

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

The purpose of this paper is to investigate the impact of switching harmonics on the instantaneous power distribution in the cells of a cascaded H-bridge-based STATCOM when using phase-shifted pulse width modulation. The case of high-and low-switching frequency for the converter cells is investigated and the interaction between voltage and current harmonics is analyzed. It is shown that in both cases, this interaction results in an uneven power distribution among the cells in the same phase leg, leading to drifting of the dc-capacitor voltages and thereby the need for proper stabilization control loops. It is also shown that the selected frequency modulation ratio affects the active power distribution among the cells. In particular, the selection of a noninteger frequency modulation ratio helps in providing a more uniform power distribution among cells of the same phase leg, thus contributing to the capacitors balancing. A methodology for optimal selection of the frequency modulation ratio is given. Theoretical conclusions are validated through simulation and experimental results.

引用

页码：815 / 824

页数：10

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