A Novel Active Power Quality Compensator Topology with DC Voltage Balancer for Electrified Railways

作者：Win Tint Soe; Hiraki Eiji; Tanaka Toshihiko^*

来源：IEEJ Transactions on Electrical and Electronic Engineering, 2013, 8(6): 634-639.

DOI：10.1002/tee.21907

• electrified railways
• active power quality compensator
• half-bridge inverter
• three-leg inverter
• constant DC capacitor voltage control
• DC voltage balancer

This paper proposes a novel active power quality compensator (APQC) topology with a DC voltage balancer for electrified railways. The APQC is composed of a three-leg structure with two common DC capacitors. Two legs perform as two half-bridge inverters, which compensate the unbalanced active, reactive, and harmonic currents on the source side in the traction substation. The third leg controls two common DC capacitor voltages with a small amount of the output currents. Therefore, the current rating of the third leg can be reduced as compared to that of the already proposed three-leg structured APQC. In the control algorithm of the two half-bridge inverters, a strategy based on constant DC capacitor voltage control is used, which does not need any calculation blocks of the unbalanced active, reactive, and harmonic components of the load current to perform the APQC operation. Thus we offer the simplest algorithm for the proposed APQC. The basic principle of the proposed APQC topology with the DC voltage balancer is discussed in detail, and then confirmed by digital computer simulation using the PSIM software. A prototype experimental model is constructed and tested. Experimental results demonstrate that the proposed APQC can achieve balanced and sinusoidal source currents on the primary side of the Scott transformer in traction substations for electrified railways.

• 出版日期2013-11