Abstract
In this paper, a novel configuration of the back-to-back (BTB) converter interconnecting two synchronous AC grids is proposed. The feature of this BTB converter configuration is the substantially reduced capacity compared with the exchanged power between the two grid partitions. Unlike the conventional full-capacity BTB converters, the capacity of the proposed BTB converter in this paper is around 50% of the exchanged power. Besides, the fault ride-through ability of the proposed converter is also enhanced, compared with the unified power flow controller (UPFC) based active power exchange/control systems. The control strategy of this BTB converter is also presented fulfilling both the active and reactive power requirements, unity power factor (UPF) for instance, of the two AC grids. The characteristics of this converter are also analyzed under and short circuit fault conditions at both sides of the two grids. Simulation results on a 127 kV/108 MW AC grid interconnection system show validity of the proposed converter circuit with the control strategy.
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