Abstract
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.
Highlights
WITH the rapid development of high-speed railways (HSRs), large numbers of electric multiple units (EMUs) have been put into operation
Since each EMU train uses a number of interleaved four-quadrant converters (4QCs) as front-end rectifiers to draw power from the traction network [1], [2], many power electronic converters are connected to traction power supply systems (TPSSs), resulting in low-frequency oscillation (LFO) incidents in different traction supplies worldwide
In order to fill up the deficiencies of previous work with regards to the LFO suppression, this paper proposes an EMU 4QC control strategy for LFO suppression based on ac current passivity-based control (PBC) and dc voltage sliding mode variable structure (SMS)
Summary
WITH the rapid development of high-speed railways (HSRs), large numbers of electric multiple units (EMUs) have been put into operation. Based on the previous analysis, the following gaps are identified in the literature: 1) There is no control method for LFO suppression that considers the steady-state, dynamic performance and robustness without extensive requirements in parameter tuning. 2) A stability analysis based on norm criterion is applied to the NTS for both the conventional and proposed control methods, indicating their LFO critical conditions. 3) The impact of traction network, 4QC circuit and controller parameters on the NTS stability is comprehensively investigated, resulting in a number of recommendations for avoiding LFO incidents.
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