Combination of SHE- and SHM-PWM Techniques for VSI DC-Link Current Harmonics Control in Railway Applications

Steczek, Marcin; Chudzik, P.; Szeląg, A.

doi:10.1109/tie.2017.2694357

Cited by 54 publications

(33 citation statements)

References 29 publications

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“…When using inverters in a traction substation, the following should be taken into account: ▶ higher investments (devices, area, building); ▶ larger energy losses in a substation, increase of rectifiers' load; ▶ an inverter should have higher rated parameters than the respective rectifier; ▶ increase of distortion from higher harmonics and voltage fluctuations in a MV network, problems with electromagnetic compatibility in a traction system [14] and radioeletrical interference; ▶ increase of reactive power consumption and lower power factor and voltage fluctuations in an AC network, which might require the use of filters of higher harmonics or reactive power compensators; ▶ requirements to use intelligent systems for control, monitoriong and protection; ▶ the requirement for a traction substation to have, at the inverter operation mode, higher voltage than an idle state of rectifier operation (e.g. so current flows only from braking vehicles and not from rectifier units to an inverter); ▶ the necessity for arrengements with local DNO (Distribution network operator) regarding the possibility of energy return to a grid.…”

Section: The Results Of Inverter Applicationmentioning

confidence: 99%

Energy efficiency of a railway line supplied by 3 kv supply system – a case study of the application of an inverter in a traction substation

Drążek

Maciołek

Szeląg

et al. 2018

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Energy efficiency of a railway line supplied by 3 kv supply system -a case study of the application of an inverter in a traction substation Efektywność energertyczna linii kolejowej zasilanej napięciem 3 kv dc -studium przypadku zastosowania falownika w podstacji trakcyjnej Abstract Due to energy saving policy in the European Union and development of power electronics technology, one might expect an increase in the use of solutions, such as inverters in the substations of the 3 kV DC power supply system. The paper includes a study case of the analysis of traffic conditions on the use of inverters in 3 kV DC system traction substations so as to send back trains' braking energy from a DC traction power supply to an AC power supply network. The authors presented possible estimated energy savings for a selected railway line. Furthermore, the character of a power waveform and energy available for transferring from a DC to an AC power supply network was discussed as well. The effectiveness of this solution largely depends on the nature of train traffic, so prior to applying the inverters, a detailed analysis is required. StreszczeniePolityka oszczędności energii prowadzona w krajach UE oraz rozwój technologii w energoelektronice zwiększa możliwości stosowania rozwiązań, takich jak falowniki w podstacjach systemu 3 kV DC. W artykule przedstawiono studium przypadku analizy wpływu warunków ruchu na zastosowania falownika w podstacji trakcyjnej 3 kV DC w celu zwrotu energii hamowania odzyskowego pociągów do zasilającej sieci elektroenergetycznej. Pokazano szacunkowo możliwe do uzyskania oszczędności energii dla wybranej linii kolejowej. Omówiono charakter przebiegu mocy oraz wartość energii możliwą do przesłania przez falownik do sieci zasilającej. Efektywność stosowanych rozwiązań i celowość stosowania falownika silnie zależy od charakteru prowadzonego ruchu, dlatego istotne jest przed jego zastosowaniem przeprowadzenie szczegółowych analiz.Słowa kluczowe: efektywność energetyczna, linia kolejowa, podstacja trakcyjna

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Section: The Results Of Inverter Applicationmentioning

confidence: 99%

Energy efficiency of a railway line supplied by 3 kv supply system – a case study of the application of an inverter in a traction substation

Drążek

Maciołek

Szeląg

et al. 2018

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“…Therefore, the harmonics of DC side current have been assumed as basic criteria. The similar approach is presented in [22] but combination of SHE and SHM (Selective Harmonic Mitigation) techniques was used to solve the problem. In present work, in order to get as many solutions of SHE control as possible, and then comparing them with the criterion, it is required to get multiple solutions of the set of non-linear equations (7) (9),each time with different starting points.…”

Section: Discussionmentioning

confidence: 99%

Analysis of disturbing effect of 3 kV DC supplied traction vehicles equipped with two-level and three-level VSI on railway signalling track circuits

Steczek

Szeląg

Chatterjee

2017

Bulletin of the Polish Academy of Sciences Technical Sciences

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Abstract. Electric traction vehicles cooperating with a 3kV DC traction system and equipped with drive systems based on voltage source inverters are the most significant sources of disturbances for a railway signalling system. Every traction vehicle to be authorised for operation on railway lines must fulfil the limits imposed on current harmonics magnitudes and those provided by railway operators. The solution introduced for prototypes of most modern traction drives is to replace the two-level inverters with three-level topology. Therefore, it is essential to establish the influence of the new solution on the railway signalling system. This paper presents a comparative analysis between simulation results delivered for two and three-level traction drive system regarding generation of disturbing current harmonics. Two types of VSI modulation techniques were taken under consideration: sinusoidal PWM (SPWM) and a new one, proposed by the authors, based on selective harmonic elimination (SHE). Furthermore, the authors presented application of one of the SHE based optimization techniques for shaping the EMU's (electric multiple unit) DC side input current harmonics spectrum in order to meet the required limits. The described technique is based on off-line generation of a set of solutions for each of the VSI operating points and selection of the best solution for the assumed criteria. The applied simulation models and the concept of SHE control were verified in a laboratory by means of a low-power drive stand. Using the three-level inverter in traction drives system results in less current harmonics than using two-level topology without modification of the modulation technique. Thus, it does not guarantee fulfilling all limits assumed in this paper. The proposed modulation technique allows for fulfilling the limits, and the technical implementation of the proposed technique in a traction drive system will be considered in future studies. fore, it generates less current and torque harmonics, resulting in lesser power losses and increased life-time of the drive. Another problem is developing a control strategy to make this type of inverters suitable for operation in traction and industrial environment. The application of a direct torque control (DTC) strategy for this purpose was presented in [6].The preferred topology of the three-level inverter for traction application seems to be the neutral point clamped NPC topology (Fig. 3b). This solution requires an additional modification of modulation to eliminate the neutral point voltage fluctuations [5,7,8].

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“…Considering quarter wave symmetry in the output waveform shown in Figure 3B, we will have a 0 = 0 and a n = 0, and the generalized Fourier coefficient for the multilevel stepped waveform is given by (4).…”

Section: Problem Formulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Multilevel voltage source/current source converters have been widely studied and researched for a variety of applications, which include induction machine drives, renewable energy integration in the grid, active rectifiers, pumps, fans, rolling mills, marine propulsion, high-voltage, direct current (HVDC) transmission, and railway traction. [1][2][3][4][5][6][7] Various research groups mainly focused on its topology, modulation, and control algorithm. The important topologies include neutral point clamped (NPC), cascaded H-bridge (CHB), and flying capacitor (FC) and various hybrid topologies such as active neutral point clamped (ANPC) and H-bridge neutral point clamped (HNPC).…”

Section: Introductionmentioning

confidence: 99%

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Low-order harmonics control in staircase waveform useful in high-power application by a novel technique

Ahmad

Al‐Hitmi

Iqal

et al. 2018

Int Trans Electr Energ Syst

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Summary Few switching transition in high‐power and medium‐voltage application of power converters is desirable. The optimal pulse‐width modulation (OPWM) at fundamental switching frequency offers a better quality waveform at lower switching losses. It is a preprogrammed modulation technique where certain amounts of lower order harmonics are controlled and fundamental voltage is maintained. Here, a set of nonlinear transcendental equations is obtained, which exhibits multiple, unique, or no solution in different range of modulation index (MI). This paper proposes an advanced and fast method to obtain switching instants for OPWM equations. Moreover, it can solve a large number of such equations as computation of Jacobian matrix in the subsequent iteration is estimated from the previous values. Moreover, the proposed method also removes the singularity problem especially for large OPWM equations. The computational, simulation, and hardware results are provided to validate the concept for various cases.

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Combination of SHE- and SHM-PWM Techniques for VSI DC-Link Current Harmonics Control in Railway Applications

Cited by 54 publications

References 29 publications

Energy efficiency of a railway line supplied by 3 kv supply system – a case study of the application of an inverter in a traction substation

Energy efficiency of a railway line supplied by 3 kv supply system – a case study of the application of an inverter in a traction substation

Analysis of disturbing effect of 3 kV DC supplied traction vehicles equipped with two-level and three-level VSI on railway signalling track circuits

Low-order harmonics control in staircase waveform useful in high-power application by a novel technique

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