Abstract
In this paper, a system with series hybrid converter and shunt active converter (SHC&SAC) for compensation in cophase high-speed electric railways is proposed. Unlike the general power flow conditioners, the dc-links of the two converters are separated, and therefore, the two converters can operate independently. Just by taking the advantage of the reactive power generation ability and novel connection of SHC&SAC, the grid-side power factor can be improved and negative-sequence current can be suppressed, especially on the cases of high-speed trains. Besides, because of the capacitor in SHC, the active capacity of SHC is significantly lower than that of SAC. To obtain a good current tracking performance, the passive control method, which is based on the dissipation characteristic of resistor, is adopted for controlling converters. And finally, the effectiveness of the system is verified by simulation and experimental results.
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