Abstract
This paper proposes a four-star 12-pulse diode rectifier with a circulating current shaping circuit CCSC on the DC side to decrease the input current harmonics effectively. The type of circulating current that can eliminate the input current harmonics is analysed and its waveform parameters are derived. The effects of triangular circulating current on the harmonics of the input current are analysed, and the harmonic suppression mechanism of the triangular circulating current is revealed. This scheme has excellent harmonic suppression capability, and the capacity of CCSC is only 2.35% of output power of the 12-pulse rectifier. Thus, this scheme is cost effective for high power applications. The experimental results confirm the theoretical analysis and near sinusoidal input current is obtained.
Highlights
The four-star 12-pulse diode rectifier, which possesses high reliability and low diode conduction losses, is often used in low-voltage and high-current applications like electrolysis, electroplates, heating coils, and DC arc furnaces [1,2,3]
Based on the above analysis, the fundamental component of the input current increases slightly because of the circulating current ij, the n = 12h ± 1 order harmonics contained in the input current decrease significantly, and the harmonic suppression efficiency increases with the order of harmonics
The reason is that the circulating current shaping circuit (CCSC) feeds the extracted harmonic energy back to the load, thereby avoiding the waste of harmonic energy so that the 12-pulse rectifier with the CCSC on the DC side can achieve high efficiency
Summary
The four-star 12-pulse diode rectifier, which possesses high reliability and low diode conduction losses, is often used in low-voltage and high-current applications like electrolysis, electroplates, heating coils, and DC arc furnaces [1,2,3]. In Fukuda et al [23], a 12-pulse diode rectifier with an auxiliary voltage source is presented; it adds an auxiliary voltage source to the secondary side of the IPR to form a specific circulating current This method avoids the series connection between load and additional components. The CCSC is connected in parallel rather than in series with load and it avoids additional conduction losses Compared with those methods using an auxiliary single-phase voltage converter to modulate the output current of the diode rectifier bridge [23], the proposed scheme using a CCSC shapes the output current of the 6-pulse rectifier (bridge) directly, and so the effects of load current variation on the ability to suppress harmonics are weakened
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