Abstract
The severe power quality problems aroused by the single-phase 25-kV traction power supply system (TPSS), especially for the voltage unbalance (VU) and high-frequency harmonic resonance, have attracted increasing attention nowadays. In this paper, a novel hybrid power quality compensation system, including a power flow controller (PFC) and thyristor-controlled L and C-type filter (TCL-CTF), is proposed. The PFC can be used for VU compensation, and the TCL-CTF can be designed to filter out harmonics as well as compensate reactive power. Furthermore, an optimized compensation strategy is proposed, and the power quality of the TPSS can meet the requirements of the technology standard. Compared with the conventional scheme, the compensation capacity of the PFC can be reduced by 12%, as well as the cost. Finally, the effectiveness of the proposed system is verified by the simulation and experimental results.
Highlights
The Chinese government is rapidly constructing massive electrical railways to promote economic prosperity [1,2], which are mainly represented by their high speed and heavy load
The simulation model assumes the system parameters Ssc = 2000 MVA, X/R = 7; the basic parameters of traction net and traction transformer (TT) come from the field traction substation (TSS) in Section 6.1; the typical harmonic current model of the train comes from the field the field TSS in Section 6.1; the typical harmonic current model of the train comes from the field testing result
On the one hand, when the ninth and 11th harmonic currents are injected, the isys is larger than iL for each frequency, which means that the resonance point of the traction power supply system (TPSS) is correctly portrayed
Summary
The Chinese government is rapidly constructing massive electrical railways to promote economic prosperity [1,2], which are mainly represented by their high speed and heavy load. The PPF is more available in terms of the cost and reliability In this regard, the C-type filter has drawn attention to the railway field in recent years, as it filters out the particular high-order harmonic region, and compensates for the reactive power to improve system performance [21]. A thyristor-controlled LC-coupling (TCLC) structure has been introduced to govern the distortion and PF of the three-phase load in the power grid [23]. A novel hybrid compensation structure combined with the PPF and TCL can be designed to handle the above problem in railways. The different multilevel constructs of PFC have been presented in recent years, which can reduce the switching frequency, power loss, and harmonic distortion [17,26].
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