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Interleaved PWM with discontinuous space-vector modulation
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DOI：10.1109/63.788496.png)
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摘要
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This paper describes the effect of interleaved discontinuous space-vector modulation (SVM) in paralleled three-phase systems using three-phase pulsewidth modulation (PWM) rectifiers as an example. At the discontinuous point of the SVM, the phase shift between the switching signals of the paralleled modules generates a zero-sequence excitation to the system. Because the conventional control in a balanced three-phase system,vith only dq channels cannot reject this disturbance, a heat-frequency circulating current,will develop on the zero axis. Based on this observation, a SVM without using zero vectors is used to eliminate the cause of pure zero-sequence current for parallel operation. Using this SVM, the circulating current is observable in dq channels. It can be suppressed dynamically by strong current loops of power-factor-correction (PFC) circuits. The concept is verified experimentally on a breadboard system.
Keyword:
circulating current
discontinuous space-vector modulation
interleaved PWM
parallel three-phase system
power electronics building blocks (PEBB's)
zero-axis current
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IF:
6.5
论文数:
1.7W
被引数:
8.3W
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