Abstract
The harmonics of line to line voltage in two-stage matrix converter (TSMC) with fixed carrier frequency had discrete and high values and produced powerful electromagnetic interference (EMI). In this paper, chaotic carrier frequency modulation technique (CCFMT) was applied in TSMC for the first time to spread sideband range and suppress harmonic peak value. Although this technique could suppress EMI, it would increase the probability of narrow pulses. In order to improve reliability, the rectifier in the two-stage matrix converter uses PWM modulation with zero vector to extend the zero current commutation time, solves the narrow pulse problem, and simplifies the commutation process. At last, an experiment platform was designed and experimental results showed that harmonics of line to line voltage was efficiently suppressed.
Highlights
two-stage matrix converter (TSMC) is a kind of direct AC/AC converters, which consists of rectifier and inverter with no filter capacitors
Due to the fixed carrier frequency, the harmonics which appear at integer multiples of the carrier frequency of TSMC line to line voltage possess discrete and high values and produce powerful electromagnetic interference (EMI)
In constant carrier frequency modulation, the harmonics in output line voltage frequency spectra concentrate on integer multiples of carrier frequency and possess large peak values bringing about powerful EMI
Summary
TSMC is a kind of direct AC/AC converters, which consists of rectifier and inverter with no filter capacitors. TSMC can generate narrow pulses inevitably and CCFMT increases the possibility of producing them, which can lead to commutation failure and device damage [20–29]. In response to these shortcomings, we propose a new CCFMT which can improve commutation reliability. When the carrier frequency changes according to chaotic principle, the switching moment will be uncertain. It brings about irregularly distributed narrow pulses due to decreasing commutation time as the carrier period shortens. We propose a new CCFMT to improve the commutation reliability of TSMC [36–41]
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