Analytical evaluation of DC capacitor RMS current and voltage ripple in neutral-point clamped inverters

被引：9
作者：
Gopalakrishnan, K. S. [1 ]
Janakiraman, Santosh [1 ]
Das, Soumitra [2 ]
Narayanan, G. [1 ]
机构：
[1] Indian Inst Sci, Dept Elect Engn, Bangalore 560012, Karnataka, India
[2] Natl Inst Technol Goa, Dept Elect & Elect Engn, Farmagudi 403401, Ponda, India
来源：
SADHANA-ACADEMY PROCEEDINGS IN ENGINEERING SCIENCES | 2017年 / 42卷 / 06期
关键词：
Current control; current stress; diode-clamped inverter; full-bridge inverter; half-bridge inverter; multi-level inverter; proportional-resonant controller; sinusoidal modulation; vector control; voltage ripple; LINK CAPACITOR; 3-LEVEL; CONVERTER;
D O I：
10.1007/s12046-017-0668-y
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The sizing of the DC-link capacitor in a three-level inverter is based on the RMS current flowing through it. This paper analyses the DC-link capacitor RMS current in a neutral-point clamped (NPC) inverter and expresses the same as a function of modulation index, line-side current amplitude and power factor. Analytical closed-form expressions are derived for the capacitor RMS current for single-phase half-bridge, single-phase full-bridge and three-phase three-leg topologies of a three-level inverter. The worst-case capacitor current stress is determined for each topology based on the analytical expressions. Further, analytical expressions are derived for the RMS values of low-frequency and high-frequency capacitor currents. These expressions are then used to estimate voltage ripple across the DC capacitor for sinusoidally modulated three-phase NPC inverter. The analytical expressions for the RMS current and voltage ripple are validated experimentally over a wide range of operating points.
引用
收藏
页码：827 / 839
页数：13
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