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Proceedings ArticleDOI

Locomotives harmonic compensation by SiC auxiliary converter with active filter function

Meijun Mu1, Shihui Liu1, Fei Lin1, Zhongping Yang1, Ikuo Yasuoka2 
01 Aug 2017-pp 1-6
TL;DR: In this article, a method of active filter applied to an auxiliary four-quadrant converter of electric locomotive or high speed train is presented, where the auxiliary power supply system is designed to generate an inverse harmonic current at AC side to produce the high frequency compensating current.
Abstract: This paper presents a method of active filter applied to auxiliary four- quadrant converter of electric locomotive or high speed train. In this technique, auxiliary power supply system is designed to generate an inverse harmonic current at AC side to produce the high frequency compensating current. So the auxiliary four- quadrant converter should operate at a high speed with the application of SiC devices. The results and effectiveness of the scheme is verified by simulation.
Citations
More filters
Proceedings ArticleDOI
01 Dec 2018
TL;DR: The basic concepts regarding active power filters, an active filter generates a compensating signal that mitigates the harmonics, thus improving the power quality of the grid, are presented.
Abstract: This paper presents the basic concepts regarding active power filters. An active filter generates a compensating signal that mitigates the harmonics, thus improving the power quality of the grid. Some of the most recent applications of these filters in several fields of electrical engineering are depicted. And a practical example is shown.

2 citations


Additional excerpts

  • ...An active filter circuit using inductor energy storage to avoid voltage drops is described in [24], while [25] presents an active filter applied to auxiliary four-quadrant converters of electric locomotives or high speed trains....

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References
More filters
Journal ArticleDOI
TL;DR: In this article, the authors have characterized common nonlinear loads have been characterized into two types of harmonic sources, current-source type of harmonic source and voltage source type of source, and discussed the compensation characteristics of both parallel active filters and series active filters.
Abstract: In this article, common nonlinear loads have been characterized into two types of harmonic sources, current-source type of harmonic source and voltage-source type of harmonic source. Compensation characteristics of both parallel active filters and series active filters have been discussed analytically and experimentally for these two types of harmonic sources. The corresponding required operation conditions, features, application issues, and adaptive harmonic sources of both filters have been presented. The fact that the traditional active filter, the parallel active filter, is not a panacea to harmonic compensation, and that one cannot use it blindly, has been clearly addressed. The parallel active filter will increase harmonic current and may cause overcurrent of the load when the load is a harmonic voltage source. Instead, it has been verified that the series active filter is better suited for compensation of a harmonic voltage source such as a diode rectifier with smoothing DC capacitor. The conclusions of this article also imply that when a parallel active filter is installed in a power system network such as at a point of common coupling, the network impedance and main harmonic sources downstream from the installation point should be investigated in order to get good performance and to minimize influence to the loads downstream. In some cases, a combined system of parallel active filter and series active filter may be necessary by utilizing the harmonic isolation function of the series active filters. No doubt active filters are superior to passive filters if used in their niche applications.

524 citations

Journal ArticleDOI
TL;DR: Simulation and experimental results show that the proposed APF scheme has good power decoupling performance and is more suited for high-power applications where switching frequency is limited.
Abstract: Single-phase pulsewidth modulation rectifiers suffer from ripple power pulsating at twice the line frequency. The ripple power is usually filtered by a bulky capacitor bank or an LC branch, resulting in lower power density. The alternative way is active power decoupling, which uses an active circuit to direct the pulsating power into another energy-storage component. The main dc-link filter capacitor can, therefore, be reduced substantially. This paper proposed a new scheme of active power decoupling. The circuit consists of a third leg, an energy-storage capacitor and a smoothing inductor. The topology combined the advantages of high energy-storage efficiency and low requirement on control bandwidth. Both the pulsating power from the ac source and the reactive power of the smoothing inductors are taken into consideration when deriving the power decoupling scheme. The active power filter's (APF) capacitor voltage control system consists of inner loop pole-placement control and outer loop proportional-resonant control. To enhance the steady-state performance, the capacitor voltage reference is modified in a closed-loop manner. Simulation and experimental results show that the proposed APF scheme has good power decoupling performance and is more suited for high-power applications where switching frequency is limited.

286 citations


"Locomotives harmonic compensation b..." refers background in this paper

  • ...The switching frequency is designed to be 20kHz.[6]This paper is organized as follows....

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Journal ArticleDOI
TL;DR: A linear current control scheme for single-phase active power filters that provides additional attenuation to the harmonics coming from the load current, the grid voltage, and the reference signal, resulting in a grid current with lower harmonic distortion.
Abstract: This paper presents a linear current control scheme for single-phase active power filters. The approach is based on an outer voltage loop, an inner current loop, and a resonant selective harmonic compensator. The design of the control parameters is carried out using conventional linear techniques (analysis of loop gain and other disturbance-rejection transfer functions). The performance of the proposed controller is evaluated and compared with two reference controllers: a basic control and an advanced repetitive control. In comparison with these controllers, the proposed control scheme provides additional attenuation to the harmonics coming from the load current, the grid voltage, and the reference signal, resulting in a grid current with lower harmonic distortion. Experimental results are reported in order to validate this paper.

184 citations


"Locomotives harmonic compensation b..." refers background in this paper

  • ...While active power filter (APF) has harmonic-rejection capabilities when frequency is fluctuating in system [2]- [4]....

    [...]

Journal ArticleDOI
TL;DR: In this article, a comparison of silicon and SiC device technologies for the use in hybrid electric vehicle traction inverters is presented and a scalable loss and scalable thermal modeling approach is used to find the optimum chip area for each Si or SiC traction inverter.
Abstract: Silicon carbide (SiC) based power semiconductors are expected to contribute to an increase in inverter efficiency, switching frequencies, maximum permissible junction temperature, and system power density. This paper presents a comparison of silicon (Si) and SiC device technologies for the use in hybrid electric vehicle traction inverters. SiC-JFETs and SiC-MOSFETs are characterized and a scalable loss and scalable thermal modeling approach is used to find the optimum chip area for each Si or SiC traction inverter. This procedure also provides a proper technical comparison of the semiconductor technologies. The progressed simulations using standardized drive cycles and thermal-electrical coupled semiconductor models permit an inverter performance evaluation close to real load situations, leading to an improved estimation of the benefit which can be expected from systems utilizing SiC technology. This paper concludes that the SiC devices can lead to a reduction in chip area and semiconductor losses by more than 50% at the same time in hard switching applications with partial load dominated mission profiles.

108 citations


"Locomotives harmonic compensation b..." refers background in this paper

  • ...Reference[12] gives a conclusion that SiC devices could lead to a reduction in inverter losses by more than 50%....

    [...]

Journal ArticleDOI
01 Mar 1997
TL;DR: In this article, an analytical technique for calculating the AC input current harmonic spectrum of single-phase PWM converter drives used in railway traction is presented, based on a 3-D modulation model and the double Fourier series (DFS) method.
Abstract: The paper presents an analytical technique for calculating the AC input current harmonic spectrum of single-phase PWM converter drives used in railway traction. The technique is based on a 3-D modulation model and the double Fourier series (DFS) method. Formulas in the form of Bessel functions representing the harmonic spectra for several combinations of interlaced PWM converters are derived. These give a useful insight into the harmonic generation and cancellation process which occurs with interlaced configurations. They are also used in a theoretical explanation of the interlacing angle, system parameter symmetry and load balance between interlaced converters. The accuracy of this analytical technique is confirmed by comparing the results with those obtained from a frequency domain model (FDM) of the PWM converter drive.

58 citations


"Locomotives harmonic compensation b..." refers background in this paper

  • ...The traction inverter is designed to realize frequency convention and the traction motor is operated to transfer the electric power into mechanical energy [7]....

    [...]