Abstract To solve the problems of power quality and split section that exist in the traditional traction power supply system (TPSS), a novel TPSS that based on the modular multilevel converter multi terminal high voltage direct current (MMC-MTDC) was introduced. The issue of double frequency ripples in the DC voltage/current which appears in the novel TPSS was analyzedand it was caused by two reasons; One reason is the circulating current of single-phase H bridge MMC (SPH-MMC) flow into the DC network. Another is a zero sequence voltage component existing in the bridge voltage of three-phase MMC in unbalanced grid condition. To suppress the double frequency fluctuation, a circulating current suppressing controller based on the quasi proportional resonant (quasi-PR) regulator and the second order generalized integrator (SOGI) filter was design for SPH-MMC; And a controller without PLL and separate positive and negative sequence components of current was proposed for three-phase MMC, besides a DC voltage ripple suppressing control strategy based on the voltage compensation was proposed. Finally, a three terminal single-phase to three-phase MMC-MTDC simulation model was built to support the theoretical analysis and proposed control schemes.
Song Pinggang,Wu Jizhen,Dong Hui. Analysis and Suppressing DC-Side Twice Ripples of a Novel Traction Power Supply System[J]. Transactions of China Electrotechnical Society, 2017, 32(9): 80-91.
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2017, Vol. 32 
