Title :
A half-bridge inverter based Active Power Quality Compensator with a DC voltage balancer for electrified railways
Author :
Win, Tint Soe ; Baba, Yusuke ; Okamoto, Masayuki ; Hiraki, Eiji ; Tanaka, Toshihiko
Author_Institution :
Grad. Sch. of Sci. & Eng., Yamaguchi Univ., Ube, Japan
Abstract :
This paper proposes a half-bridge inverter based Active Power Quality Compensator (APQC) with a DC voltage balancer for electrified railways. The APQC is composed of three-leg structured power devices with two common DC capacitors. The first two legs perform as two half-bridge inverters to generate compensation currents and the third-leg is used for DC voltage balancer. The first-leg is connected to α-phase and the second-leg is connected to β-phase. Two DC capacitors are connected in series and midpoint is grounded. These two half-bridge inverters exchange and balance active power for two feeders through two common DC capacitors and compensate reactive and harmonic components of the distorted load currents. The third-leg controls two common DC capacitors to balance voltage level of each other. Using proposed APQC, the primary side of Scott transformer attains balanced and sinusoidal source currents. The principle and control algorithm of proposed a half-bridge inverter based APQC is discussed in detail. The proposed APQC is confirmed by both the PSIM computer simulation software and prototype experiment system. Simulation results show that the proposed APQC can achieve balanced and sinusoidal source currents in secondary side of Scott transformer.
Keywords :
invertors; power capacitors; power supply quality; railway electrification; voltage control; APQC; DC capacitors; DC voltage balancer; PSIM computer simulation software; Scott transformer; control algorithm; electrified railways; half-bridge inverter based active power quality compensator; harmonic components; load currents; prototype experiment system; reactive components; three-leg structured power devices; Capacitors; Harmonic analysis; Integrated circuits; Inverters; Power quality; Rail transportation; Voltage control; active power quality compensator; constant dc capacitor voltage control; electrified railways; half-bridge inverter; three-leg inverter; voltage balancer;
Conference_Titel :
Power Electronics and Drive Systems (PEDS), 2011 IEEE Ninth International Conference on
Conference_Location :
Singapore
Print_ISBN :
978-1-61284-999-7
Electronic_ISBN :
2164-5256
DOI :
10.1109/PEDS.2011.6147244