Stability Research of High-Speed Railway EMUs and Traction Network Cascade System Considering Impedance Matching

Liu, Zhigang; Zhang, Guinan; Liao, Yicheng

doi:10.1109/tia.2016.2574770

Cited by 71 publications

(32 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Previous studies analyzed the LFO mechanism through stability studies on the NTS [8]- [12]. Based on the equivalent impedance/ admittance models of the network and train, a range of stability criteria, such as the generalized Nyquist criterion [8], dominant pole [9], norm criterion [10] and forbidden region-based criterion [11], [12] were used. In [8], the disadvantages of the Nyquist criterion in LFO analysis and an alternative method based on Bode diagrams were presented.…”

Section: Introductionmentioning

confidence: 99%

“…Based on the equivalent impedance/ admittance models of the network and train, a range of stability criteria, such as the generalized Nyquist criterion [8], dominant pole [9], norm criterion [10] and forbidden region-based criterion [11], [12] were used. In [8], the disadvantages of the Nyquist criterion in LFO analysis and an alternative method based on Bode diagrams were presented. Dominant poles were used to analyze the variation law of equivalent train impedance with respect to 4QCs control parameters when a LFO occurred [9], resulting in an optimal order for adjusting the control parameters.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Stability and Suppression Study for Low-Frequency Oscillations in Network-Train System

et al. 2020

View full text Add to dashboard Cite

Electric multiple units (EMUs) have been the cause of low frequency oscillation (LFO) incidents in high-speed railway (HSR) network train systems (NTSs). In this paper a norm criterion with the advantages of simpler calculation while being less conservative than other norm criteria is introduced to analyze the stability of the NTS. A control strategy of EMU four-quadrant converters (4QCs) consisting of ac current passivity-based control (PBC) and dc voltage sliding mode variable structure (SMS) control, i.e. PBC-SMS, is proposed for LFO suppression. The NTS stability analysis with PBC-SMS results in superior critical LFO condition. A single EMU simulation validates the improved steady-state and dynamic performance of the PBC-SMS compared to other conventional methods; NTS simulations based on field tested network parameters verify the superior LFO suppression capability of the proposed method. Finally, guidelines for LFO suppression are recommended based on a comprehensive sensitivity analysis of the traction network, 4QC circuit and controller parameters of an NTS.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Stability and Suppression Study for Low-Frequency Oscillations in Network-Train System

et al. 2020

View full text Add to dashboard Cite

show abstract

“…Recently, a bundle of research in the field of MLI has made, like applications such as Photo Voltaic System, STATCOM, Industrial drives and High Voltage Direct Current (HVDC) [1][2][3][4][5][6][7]. On the other hand, research work on Railway Traction Systems is relatively limited [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Fuzzy Logic Based Control of Multilevel Inverter for Railway Traction System

Lakwal,

Dubey

2020

IJEAT

View full text Add to dashboard Cite

This research especially focus on Railway Traction System of Electrical Multiple Units (EMUs) and illustrate the approaching of an Asymmetric Cascaded H-bridge (ACHB) 9-level MLI controlled by the Fuzzy Logic Controller (FLC) to enhance the quality of output by sinking the harmonic contents in the output result. As in the railway, traction system desires high power and voltage for its operation. So it is proficient to utilize recent introduced Multilevel Inverter (MLI) instead of Conventional Inverter. MLI which is discussed here uses two H-bridge modules with unequal DC sources and it is competent to generate multilevel results at output side. Here proposed MLI uses limited semiconductor switches and voltage source. Therefore expenditure and dimensions of the system is condensed. Thus the system effectiveness will enhance. Simulation has done by MATLAB software to authenticate the performance and functional study of proposed MLI. The simulated output shows very favourable result. Comparison has been made between the two (Conventional and Multilevel) power circuit configurations.

show abstract

“…With the rapid development of high-speed railway, alternating current (AC)-direct current (DC)-AC drive electric multiple units (EMUs) and electric locomotives are increasingly put into operation. Meanwhile, low-frequency oscillation (LFO) accidents have happened in many countries, such as Norway, Germany, Switzerland, the United States, and France [1][2][3][4]. Since 2008, the phenomenon has frequently occurred in China's high-speed railway depots.…”

Section: Introductionmentioning

confidence: 99%

Suppression Research Regarding Low-Frequency Oscillation in the Vehicle-Grid Coupling System Using Model-Based Predictive Current Control

Wang

Liu

2018

Energies

Self Cite

View full text Add to dashboard Cite

Recently, low-frequency oscillation (LFO) has occurred many times in high-speed railways and has led to traction blockades. Some of the literature has found that the stability of the vehicle-grid coupling system could be improved by optimizing the control strategy of the traction line-side converter (LSC) to some extent. In this paper, a model-based predictive current control (MBPCC) approach based on continuous control set in the dq reference frame for the traction LSC for electric multiple units (EMUs) is proposed. First, the mathematical predictive model of one traction LSC is deduced by discretizing the state equation on the alternating current (AC) side. Then, the optimal control variables are calculated by solving the performance function, which involves the difference between the predicted and reference value of the current, as well as the variations of the control voltage. Finally, combined with bipolar sinusoidal pulse width modulation (SPWM), the whole control algorithm based on MBPCC is formed. The simulation models of EMUs’ dual traction LSCs are built in MATLAB/SIMULINK to verify the superior dynamic and static performance, by comparing them with traditional transient direct current control (TDCC). A whole dSPACE semi-physical platform is established to demonstrate the feasibility and effectiveness of MBPCC in real applications. In addition, the simulations of multi-EMUs accessed in the vehicle-grid coupling system are carried out to verify the suppressing effect on LFO. Finally, to find the impact of external parameters (the equivalent leakage inductance of vehicle transformer, the distance to the power supply, and load resistance) on MBPCC’s performance, the sensitivity analysis of these parameters is performed. Results indicate that these three parameters have a tiny impact on the proposed method but a significant influence on the performance of TDCC. Both oscillation pattern and oscillation peak under TDCC can be easily influenced when these parameters change.

show abstract

Stability Research of High-Speed Railway EMUs and Traction Network Cascade System Considering Impedance Matching

Cited by 71 publications

References 13 publications

Stability and Suppression Study for Low-Frequency Oscillations in Network-Train System

Stability and Suppression Study for Low-Frequency Oscillations in Network-Train System

Fuzzy Logic Based Control of Multilevel Inverter for Railway Traction System

Suppression Research Regarding Low-Frequency Oscillation in the Vehicle-Grid Coupling System Using Model-Based Predictive Current Control

Contact Info

Product

Resources

About