Power electronic traction transformer technology request pdf. Neeltrans product offering for traction application. Standard insulation of transformers is 600 v with high voltage insulation optional. Design of inductors and high frequency transformers inductors store energy, transformers transfer energy.
Medium is home to thousands of independent voices, and we combine humans and technology to find the best reading for youand filter out the rest. Get started 120 million curious readers and growing. Transformer model in wide frequency bandwidth for power. Main converter design with mf transformer main traction converter with medium frequency transformer new generation of multisystem locomotives, train sets and particularly suburban unit supplied from ac electrification system of 25kv50hz andor 15kv16.
Traction converter with mediumfrequency transformer for railway. Design and optimization of hf transformers for high power. In the domain of electric traction, the demand for medium voltage supply systems of high power, compact size and reduced weight is growing. The threephase topology is considered for high power applications where the high power density and high efficiency are. Thus, an accurate knowledge of the transformer behavior in a wide frequency range is mandatory. This work proposes a design and optimization methodology of a high power high frequency transformer accounting for the tuned leakage inductance of the trans. High frequency transformer design for solidstate transformers in electric power distribution systems.
One example is in traction transformers used for electric multiple unit and highspeed train service operating across regions with different electrical standards. After the above mentioned components, there is the traditional traction drive. Nowadays, the typical railway traction chain, which operates under alternative power supplies, includes a heavy and bulky transformer. Then transformer insulation requirement is referred for 4160 v application according to ieee standard. Highfrequency transformer design for solidstate transformers in. Mediumfrequency transformer rectifier units mf dc units and highfrequency rectifier units hf dc units mediumfrequency technology is the key joining process in the automotive industry. Analysis of electromagnetic force for medium frequency transformer. The presented configuration of the traction converter with medium frequency transformer is one of the promising solutions for the new generation of the locomotives and especially suburban units. Modelling and design of a medium frequency transformer for high. Medium voltagelow voltage mvlv transformer substations 1. This contribution gives the main emphasis on the control of the primary voltage source active rectifiers, which. As most other types of large transformers tend to be stationary, traction is probably the application that stands to. Power electronic traction transformermedium voltage. The mediumfrequency power transformer mfpt is one of the key elements of an isolated bidirectional dcdc converters in applications such as future alldc offshore wind farms, traction, and.
The load matchingwork station transformers are the. Medium voltage products technical guide the mvlv transformer. Welcome to the premier industrial source for transformers. Medium frequency high power transformers, state of art and. Mediumfrequency transformer rectifier units mf dc units. Next generation train ngtcargo medium frequency transformer mft 4. To use a medium frequency transformer mft, a frequency converter must be placed before the transformer as shown in 3. This contribution deals with a new configuration of traction converter with mediumfrequency transformer for multisystem suburban units and locomotives. A highfrequency dcdc converter for the next generation. Mediumfrequency transformer rectifier units mf dc units and high frequency rectifier units hf dc units medium frequency technology is the key joining process in the automotive industry. Various topological proposals have been made and several demonstrators have already been deployed.
Traction, transformer rectifier general specifications. Jan weigel, siemens ag final conference, brussels november 25th, 2010 medium frequency traction transformer panel 4 electric ac high speed services medium frequency traction transformer outcome of railenergy jan weigel, siemens ag. Effects of changing the frequency of a transformer. Prasad enjeti the use of high power converters has increased tremendously. Reliable efficient economical compact jackson transformer. Medium frequency transformer for traction applications. Our quality program is certified, and maintained to iso 90012015. Thanks to the new semiconductors hvigbt, igct with high voltage capability, the multilevel topologies with medium frequency transformer become very. Request pdf on may 1, 2018, milos stojadinovic and others published modelling and design of a medium frequency transformer for high power dc dc.
Applications for sic mosfets and igbts are at similar power levels, but split as the frequency increases, as shown in figure 1. Jan weigel, siemens ag energy efficiency days 2009 in tours france medium frequency traction transformer components 4qc cascade hv module multilevel or 2 level1. Main goals reduction of weight and dimensions of vehicle electrical equipment. The voltage transformer can be thought of as an electrical component rather than an electronic component. Compared with conventional line frequency transformers, medium frequency power conversion systems operating at the kilohertz range feature signi. Medium frequency transformer jackson transformer co. An epflmade prototype has been thoroughly tested and presented in several tutorials designed for experts from the academic and industrial worlds. Design and optimization of medium frequency, medium. A transformer is a passive electrical device that transfers electrical energy from one electrical circuit to one or more circuits. The mfts are very attractive for applications where full control of the power. Nowadays, in railway traction, in order to reduce the weight and the size of the input transformer, several structures using intermediate medium frequency.
Asymmetrical converters with medium frequency transformer. The magnetic cores are significantly different for inductors and high frequency transformers. In this case, it is assumed a multiphase transformer is included with the medium voltage drive and no isolation transformer is needed. This paper deals with new configuration of the traction converter with medium frequency transformer intended for ac trolley wire fed locomotives. If the frequency of a transformer is decreased by keeping voltage same, then what will be the new kva rating, magnetizing current and inductance, the induced voltage and loss of the transformer. Medium frequency transformer march 18, 20 by for frequencies of 500 hz to 10 khz that require a load matchingwork station transformer, see more details for further information on the jackson medium frequency transformer. Since decades, we design and produce successfully high quality devices and solutions for the railway market.
This paper deals with new configuration of the traction converter with mediumfrequency transformer intended for ac trolley wire fed locomotives. Change the 5060 hz ac medium voltage to a high frequency voltage normally in the range of several khz to tens of khz. The innovative use of power semiconductors in a core component such as traction transformers opens up new opportunities for rail markets around the world, and should be extendable across a range of other applications, said markus heimbach, head of the transformers business, a. The phasor diagram for a single phase transformer with a 1. Asymmetrical converters with medium frequency transformer isolation to interface low voltage dc to a medium voltage three phase grid. Traction transformer core multipoint grounded fault on. Medium frequency transformer for traction applications making. Modern power electronics allow for a more efficient and much lighter alternative. Furthermore, new dualpower and hybrid vehicles as well as the new modular multilevel converter topology for 162 3hz traction power supply will be covered. Design of inductors and high frequency transformers. New configuration of traction converter with medium. Medium voltage technical guide basics for mv design according to iec standards.
The medium frequency transformer also reduces noise levels. Key enabler for internet of energy dc andor ac interfaces with high frequency isolation between medium voltage grid and renewables, distributed energy storage, ev, and dc or ac loads a platform enables unior bidirectional power flow with local autonomous. Soft switching converter with high voltage semiconductors abstract. Medium voltage high frequency transformer is the key element in terms of insulation safety, power density and efficiency. Medium voltage, medium frequency transformers mfts are much smaller in size and weight compared to conventional low frequency transformers. Fuses are often applied for short circuit protection and to disconnect the rc snubber should it fail. However, the earthed points will form a closed loop when the core and.
In this paper, the authors propose a soft commutated topology based on dual structure association. In this topology, a capacitor can be used between the bottom leg of the high frequency inverter and the transformer, forming an lc resonant circuit with the equivalent inductance of the transformer. As most other types of large transformers tend to be stationary, traction is probably the application that stands to benefit most from reducing the transformer s weight. Furthermore we can get 3rd party short circuit testing on our units if required.
Institute of electrical and electronics engineers inc. The development of the smart grids leads to new challenges on the power electronics equipment and power transformers. Our traction rolling stock transfomers stand for exceptional reliability and superior product attributes. Mf transformer mf transformer increases the efficiency by 35% mf transformer saves mass axle loads. Among which, multipoint grounded fault of the traction transformer core is one of the most usual cases. A wide variety of medium frequency transformer options are available to you, such as high frequency, rectifier, and current. Mediumfrequency transformers for smart grid applications. Phase transformer an overview sciencedirect topics. Transformer book is still in demand is a tribute to the publishers and to the authors who have carried the torch to light our way for 75 years. The pet consists of the medium frequency transformer mf transformer and power electronic converters on the primary and secondary sides. The medium frequency transformer mft is one of the key components in the isolated dcdc converters 1,2,3,4 related to. The transformer noload current, i 0 consists of the physically inseparable magnetizing current and core loss components. Morgan lacey in 1925, based on a series of pamphlets entitled transformer abstracts that were.
A new report on the medium voltage transformer market by fmi provides detailed insights on key factors affecting the growth of the medium voltage transformer market, along with historical trends, future growth prospects, market dynamics, competition analysis, and regionwise market breakdown. Transformers may require protective relays to protect the transformer from overvoltage at higher than rated frequency. The major problem is to reach a high switching frequency with high voltage devices. Pdf high frequency isolated power conversion from medium. The use of power electronic transformer presents several advantages, but new problems related with the application of high frequency voltage and current components come across. Frequency and polarization transformer, second edition crc press book completely revised and updated to reflect recent advances in the fields of materials science and electromagnetics, electromagnetics of time varying complex media, second edition provides a comprehensive examination of current. In the application for a traction drive 24, unidirectional power flow is enough. All designs are optimized utilizing our exclusive computer programs to ensure the highest quality product.
Solidstate transformers in locomotives fed through ac lines. You can also choose from single medium frequency transformer there are 301 suppliers who sells medium frequency transformer on, mainly located in asia. A new multilevel converter with multiwinding medium frequency transformer. The objective of this thesis is to present a high or medium frequency transformer design methodology for solidstate transformer sst applications. The worldwide increasing interests towards medium frequency high power transformers mfhpts as a key element of high power converters in offshore wind farms and traction systems makes it a. A transformer is a passive electrical device that transfers electrical energy from one electrical. Medium frequency, as well as a variety of related products and services. The converter equipment and traction transformers have to. Thanks to the new semiconductors hvigbt, igct with high voltage capability, the multilevel topologies with medium frequency transformer become very attractive. Jan weigel, siemens ag final conference, brussels november 25th, 2010 medium frequency traction transformer summary high speed train. It is concerned to the primary serially connected singlephase voltagesource active rectifiers, which are dir. Winding design of a high power medium frequency transformer. Review of power electronic transformer in railway traction.
Medium voltage technical guide electrical engineering portal. Energies free fulltext effective permeability of multi. Powerfrequency transformers may have taps at intermediate points on the winding, usually on the. Medium frequency transformer load matchingwork station transformers are customized to meet customer requirements, and are available in various ratings to match the appropriate load. The two stage dcdc converter consists of a dcac inverter, a high frequency transformer, and a rectifier. Current transformers manufactured with current ratios from 4000.
Their device is poised to enhance the flexibility and efficiency of tomorrows smart grids and dc power distribution networks. At neeltran we design and manufacture our own rectifiertransformers and rectifiers. It is concerned to the primary serially connected singlephase voltagesource active rectifiers, which are directly connected to the trolley wire. Inductors need an air gap for storing energy, transformers do not. Design and optimization of medium frequency, medium voltage. To use a mediumfrequency transformer mft, a frequency converter must be placed before the transformer as shown in 3. High frequency isolated power conversion from medium. Nowadays, in railway traction, in order to reduce the weight and the size of the input transformer, several structures using intermediate medium frequency stages. The proposed high frequency transformer isolated acdc converters used for feeding. However, for mediumvoltage highpower dcdc converters employing transformer for galvanic isolation, it is attractive to increase switching frequency in order to reduce the transformer size. Several solutions based on this principle were proposed these last years. Modern power electronics allow for a more efficient.
A solidstate transformer is a galvanically isolated converter with power electronics interfaces on its terminals and isolation achieved at arbitrary high operating frequency of an integrated medium high frequency transformer. Basic principles the best distribution system is one that will, costeffectively and safely, supply adequate electric service to both present and future probable loadsthis section. Traction transformers and dc traction power supplies. Being one of merging technologies, power electronic transformer pet is attracting more and more attentions. Bidirectional currentfed medium frequency transformer isolated acdc converter. A varying current in any one coil of the transformer produces a varying magnetic flux, which, in turn, induces a varying electromotive force across any other coils wound around the same core. Nowadays, in railway traction, in order to reduce the weight and the size of the input transformer, several structures using intermediate medium frequency stages are under consideration. On the secondary side of the transformer, a rectifier converts this to the dc link voltage. Solid state transformer for power distribution applications. Frequency transformer an overview sciencedirect topics. Firstly, two mostly used transformer structures are compared.
Vlk 3 1katedra elektromechaniky a vykonove elektroniky, zapadoeska univerzita v plzni. Trafomec transformers and reactors main applications. Mft, a frequency converter must be placed before the transformer as shown in. Traction transformer 1 mva, superconducting, oilimmersed and medium frequency 191 traction transformer 1mva, superconducting, oilimmersed and medium frequency m. This contribution deals with a new configuration of traction converter with medium frequency transformer for multisystem suburban units and locomotives. The presented configuration of the traction converter with mediumfrequency transformer is one of the promising solutions for the new generation of the locomotives and especially suburban units. Epfl researchers have developed a compact and efficient medium frequency transformer. Power electronics transformers pets have the advantages of small volume and light weight, so they have promising applications in rail transit traction systems substituting traditional transformers.
Design and optimization of hf transformers for high power dc. Trafomec designs and manufactures traction transformers and electromagnetic assembly for all types of transport, railway and marine applications, supported by a wealth of experience in the industry proven internationally by a long track record. Medium voltage transformer market analysis 20192029. Study on efficiency optimization of medium frequency. In order to reduce the size and the weight of the input transformer, a medium frequency topology, which involves switches in soft commutation mode, is proposed. For frequencies of 500 hz to 10 khz that require a load matchingwork station transformer, see more details for further information on. The main transformer contributes considerably to losses in traction system especially in 16,7 hz systems. The companies featured in the following listing offer a comprehensive range of transformers. Medium frequency transformers mfts have achieved extensive attention since they are widely used in medium frequency energy conversion. Schaffner brings a wide experience in the traction rolling stock transformer business. One example is in traction transformers used for electric multiple unit and highspeed train. Resistance value are most often rated 30 ohms as this value of resistance is suitable for virtually all installations. The high frequency transformer approach has the advantages of small size and weight, at the expense of increased complexity. Thanks to their compact size and exceptional power density, these transformers can be used, amongst other things, for particularly lightweight welding guns.
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