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Analytical closed‐form expressions of DC current ripple for three‐level neutral point clamped inverters with space‐vector pulse‐width modulation
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The current ripple of the DC bus is a key factor for the DC‐link capacitor parameter design of three‐level neutral point clamped (NPC) inverters. It directly affects the selection of capacitor type and material. In this study, an analytical closed‐form expression of DC current ripple for NPC inverters with space‐vector pulse‐width modulation (SVPWM) is proposed based on an analytical study of the calculation principle of capacitor current ripple and SVPWM algorithm. The closed‐form expression of DC‐link capacitor current ripple is given by modulation index
M
and power factor angle
φ
. The deviation of calculation and experience is within 5.7% in spite of neglecting the output current ripple. The analytical closed‐form expression provides a convenient way to design the DC‐link capacitor of a three‐level NPC inverter.
Institution of Engineering and Technology (IET)
Title: Analytical closed‐form expressions of DC current ripple for three‐level neutral point clamped inverters with space‐vector pulse‐width modulation
Description:
The current ripple of the DC bus is a key factor for the DC‐link capacitor parameter design of three‐level neutral point clamped (NPC) inverters.
It directly affects the selection of capacitor type and material.
In this study, an analytical closed‐form expression of DC current ripple for NPC inverters with space‐vector pulse‐width modulation (SVPWM) is proposed based on an analytical study of the calculation principle of capacitor current ripple and SVPWM algorithm.
The closed‐form expression of DC‐link capacitor current ripple is given by modulation index
M
and power factor angle
φ
.
The deviation of calculation and experience is within 5.
7% in spite of neglecting the output current ripple.
The analytical closed‐form expression provides a convenient way to design the DC‐link capacitor of a three‐level NPC inverter.
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