TY - JOUR
T1 - Impedance Measurement of Traction Network and Electric Train for Stability Analysis in High-Speed Railways
AU - Pan, Pengyu
AU - Hu, Haitao
AU - Yang, Xiaowei
AU - Blaabjerg, Frede
AU - Wang, Xiongfei
AU - He, Zhengyou
PY - 2018/12
Y1 - 2018/12
N2 - Instability and oscillation issues have frequently occurred in high-speed railways due to the impedance mismatch versus frequency between the four-quadrant converter (4QC)-based high-speed train and the traction network (hereinafter train-network). However, solely utilizing the mathematical deduction to quantify the impedances seems to be difficult owing to unknown detailed parameters of both traction network and electric train. This paper proposes a method to measure the equivalent impedances of the traction network and the 4QC of the electric train in the stationary frame for stability analysis. A disturbance circuit consisting of antiparallel insulated gate bipolar transistor (IGBT) modules and an excitation load is adopted by means of the pulsewidth modulation (PWM) signal to drive the IGBTs. Consequently, a desired broad spectral excitation is then generated to measure the output impedance of the traction network. When injecting the harmonics twice, which are linearly independent at the same frequency, the input impedance of the 4QC can be calculated at the corresponding frequency considering the frequency-coupled effect. The proposed method shows a good measurement accuracy. Additionally, the stability and oscillation issues of the train-network system can be then identified using measured impedances. Both simulation and experimental results validate the effectiveness of the proposed measurement method.
AB - Instability and oscillation issues have frequently occurred in high-speed railways due to the impedance mismatch versus frequency between the four-quadrant converter (4QC)-based high-speed train and the traction network (hereinafter train-network). However, solely utilizing the mathematical deduction to quantify the impedances seems to be difficult owing to unknown detailed parameters of both traction network and electric train. This paper proposes a method to measure the equivalent impedances of the traction network and the 4QC of the electric train in the stationary frame for stability analysis. A disturbance circuit consisting of antiparallel insulated gate bipolar transistor (IGBT) modules and an excitation load is adopted by means of the pulsewidth modulation (PWM) signal to drive the IGBTs. Consequently, a desired broad spectral excitation is then generated to measure the output impedance of the traction network. When injecting the harmonics twice, which are linearly independent at the same frequency, the input impedance of the 4QC can be calculated at the corresponding frequency considering the frequency-coupled effect. The proposed method shows a good measurement accuracy. Additionally, the stability and oscillation issues of the train-network system can be then identified using measured impedances. Both simulation and experimental results validate the effectiveness of the proposed measurement method.
KW - Electric train
KW - four-quadrant converter (4QC)
KW - high-speed railway
KW - impedance measurement
KW - low-frequency oscillation
UR - http://www.scopus.com/inward/record.url?scp=85046995579&partnerID=8YFLogxK
U2 - 10.1109/TPEL.2018.2836660
DO - 10.1109/TPEL.2018.2836660
M3 - Journal article
AN - SCOPUS:85046995579
SN - 0885-8993
VL - 33
SP - 10086
EP - 10100
JO - IEEE Transactions on Power Electronics
JF - IEEE Transactions on Power Electronics
IS - 12
M1 - 8359306
ER -