SE9802889A0

SE9802889A0 - Electric power transmission system

Info

Publication number: SE9802889A0
Application number: SE9802889A
Authority: SE
Inventors: Schütte Thorsten
Original assignee: Daimler Chrysler Ag
Priority date: 1998-08-28
Filing date: 1998-08-28
Publication date: 2000-02-29
Also published as: SE9802889D0; SE9802889L; WO2000012343A1; AU4949299A; WO2000012342A1

Abstract

Sammandraq En anlaggning for Overtbring av elektrisk effekt till en enfas-vaxelspanning fOrande kontaktledning (9) for spkg6ende fordon (10) innefattar en omriktare (4) med en forsta stromriktare (3) anslu- ten till ett allmant trefas-vaxelspanningsnat (1), en andra strOmriktare (6) ansluten till ett enfas-vaxelspanningsnat (8, 9), samt ett likspanningsmellanled (5) mellan stromriktarna. Atminstone en generator (12-14) av vaxelspanning är via en stromriktare (15- 17) ansluten till namnda mellanled for att mata in elektrisk effekt till det allmanna trefas-vaxelspanningsnatet och/eller enfas-vaxelspanningsnatet fOr spargAende fordon. (Fig 1). A system for transmitting electrical power to a single-phase AC voltage leading contact line (9) for sputtering vehicles (10) comprises a converter (4) with a first converter (3) connected to a general three-phase AC voltage network (1), a second converter (6) connected to a single-phase AC voltage night (8, 9), and a DC intermediate link (5) between the inverters. At least one alternating voltage generator (12-14) is connected via a converter (15-17) to said intermediate means for supplying electrical power to the general three-phase alternating voltage network and / or the single-phase alternating voltage network for saving vehicles. (Fig. 1).

Description

Ytterligare fOrdelar med samt fOrdelaktiga sardrag hos uppfinningen framgar av den efterfOljande beskrivningen samt avriga osjalvstandiga patentkrav. Further advantages and advantageous features of the invention appear from the following description and other dependent claims.

KORT BESKRIVNING AV RITNINGEN Harnedan beskrivs en sasom exempel anfard foredragen utforingsform av uppfinningen under hanvisning till bifogade ritning, pa vilken: 10 Den enda Fig 1 är en schematisk, mycket forenklad framstallning av en anlaggning fOr Overforing av elektrisk effekt enligt en fOredragen utfOringsform av uppfinningen. BRIEF DESCRIPTION OF THE DRAWINGS Hereinafter, an exemplary embodiment of the invention will be described with reference to the accompanying drawings, in which: Fig. 1 is a schematic, very simplified representation of an electrical power transmission plant according to a preferred embodiment of the invention.

DETALJERAD BESKRIVNING AV EN FOREDRAGEN UTFORINGSFORM AV UPPFINNINGEN I Fig 1 illustreras hur ett publikt (allmant) trefas-vaxelspanningsnat 1, vilket kan leda en vaxelspanning av exempelvis 130 kV med en frekvens av 50 Hz, är via en transformator 2 ansluten till en f6rsta stramriktare 3 hos en omriktare 4 for omvandling av vaxelspanningen till en likspanning hos ett likspanningsmellanled 5 hos omriktaren. Till likspanningsmellanledet ar en andra strOmriktare 6 ansluten och anordnad att omvandla likspanningen till en enfas-vaxelspanning, vilken via en transformator 7 averfors till ett hagspanningstransmissionsnat 8, vilket leder exempelvis 130 kV enfas-vaxelspanning med en frekvens av 16 2/3 Hz utmed en kontaktledning 9 for spargaende fordon 10 far overforing av elektrisk effekt till denna utmed punkter hos den via transforma- torstationer 11. DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT OF THE INVENTION Fig. 1 illustrates how a public (general) three-phase AC voltage network 1, which can conduct an AC voltage of, for example, 130 kV with a frequency of 50 Hz, is connected via a transformer 2 to a richer first of a converter 4 for converting the gear voltage to a direct voltage of a direct voltage intermediate 5 of the converter. A second inverter 6 is connected to the direct voltage intermediate link and arranged to convert the direct voltage to a single-phase alternating voltage, which is transmitted via a transformer 7 to a high-voltage transmission network 8, which leads, for example, to 130 kV single-phase alternating voltage with a frequency of 16 2/3 Hz. 9 for energy-saving vehicles 10 receives transmission of electrical power to it along points at it via transformer stations 11.

Till likspanningsmellanledet 5 är aven fyra vindkraftsgeneratorer 12, 13, 13a och 14 anslutna via stramriktare 15-17 for levererande av elektrisk effekt till likspanningsmellanledet, varvid denna elektriska effekt kan beroende pa radande belastningsforhallanden hos den av kontaktledningen 9 utgjorda banmatningslinjen och det allmanna vaxelspanningsnatet 1 6 matas till nagot av dessa eller delas upp mellan dem i Onskade proportioner. Four wind power generators 12, 13, 13a and 14 are also connected to the direct voltage intermediate link 5 via converters 15-17 for supplying electrical power to the direct current intermediate link, this electrical power may depend on the radiating load conditions of the path supply line formed by the contact line 9 and the general alternating voltage network 1 6. fed to any of these or divided between them into desired proportions.

De olika stromriktarna 3, 6, 15-17 a r av konventionell typ med stromventiler innehallande styrbara krafthalvledarelement, sasom tyristorer eller IGBT-er, vilka styrs sá att deras vaxelspanningssida omvaxlande forbinds med olika nivaer hos likspanningsmellanledet under korta perioder for att omvandla likspanningen till en vaxelspanning och vice versa. Likspanningsmellanledet upp- visar pa konventionellt satt atminstone en icke visad kondensator for definierande av likspanningen samt en induktor for bildande av ett LC-filter for eliminerande av vid omvandlingen alstrade overtoner som skulle kunna stOra framfor alit det allmanna trefasvaxelspanningsnatet. The various current converters 3, 6, 15-17 are of the conventional type with current valves containing controllable power semiconductor elements, such as thyristors or IGBTs, which are controlled so that their alternating voltage side is alternately connected to different levels of the DC intermediate for short periods to convert the DC voltage to a DC voltage. And vice versa. The DC intermediate means conventionally has at least one capacitor (not shown) for defining the DC voltage and an inductor for forming an LC filter for eliminating harmonics generated during the conversion which could be larger than the general three-phase shaft voltage network.

En anlaggning av detta slag har en mangd fordelar, vilka noga penetrerats i foreliggande avhandlings beskrivningsinledning, men hr kommer de arida att sammanfattas. Vindkraftsgeneratorer for enfas-vaxelspanning och lag frekvens skulle bli alldeles Mr tunga, varfor en direktgenerering utan likspanningsmellanled yore ofOrdelaktig. Har tillats emellertid generatorernas varvtal fluktuera och det kan aven innebara en helt annan frekvens hos den darav genererade vaxelspanningen an hos det allmanna vaxelspanningsnatet 1. Pa detta satt kan vattenkraftgeneratorer och vindkraftsgeneratorer genom varvtalforandring battre utnyttja varierande vindhastigheter respektive vattenmangder/fallhojder. Verkningsgraden vid genereringen av enfas-effekten via vindkraftgeneratorerna blir hOgre genom att undvika omvagen Over det allmanna trefas-natet 1. Jarnvagens elsystem karaktariseras av stora snabba belastningsvariationer och at darfOr uppbyggt for att Cala detta, varfOr det aven kan svalja en generering med jamforbara effektvariationer, vilket kan bli svart for svaga allmanna trefas-nat i ofta glest bebyggda omraden dr vindkraftverk installeras. Den pa grund av stora variationer i vindhastigheter kraftigt varierande effekten alstrad av vindkraftsgeneratorerna kan saledes atminstone delvis tas upp av enfasbanmatningslinjen. Det kan dessutom vara sa att det allmanna trefas- 7 vaxelspanningsnatet inte klarar av att ta emot den ytterligare effekt som alstras genom vindkraftverk som satts upp pt en ort tackt av detta nat, men cla mOjliggOr anslutandet av vindkraftverken till namnda omriktares likspanningsmellanled ett utnyttjande av vindkraftenergin trots alit genom att )ta banmatningslinjen ta hand om den. Genom att generering och omriktning samordnas Ors samordningsvinster som är kostnadsinbesparande. Slutligen är bide vindenergi och elektrifierad jarnvag fOrknippade med stora miljaftirdelar, varfor en kombi- nation av dessa är speciellt fordelaktig. An installation of this kind has a number of advantages, which have been carefully penetrated in the description introduction of the present dissertation, but here the arida will be summarized. Wind power generators for single-phase alternating voltage and low frequency would be very heavy, which is why a direct generation without direct voltage intermediate is more advantageous. However, the speed of the generators has been allowed to fluctuate and this can also mean a completely different frequency of the alternating voltage generated thereby than of the general alternating voltage network 1. In this way, hydropower generators and wind power generators can better utilize varying wind speeds and water levels / fall heights. The efficiency of the generation of the single-phase power via the wind power generators is increased by avoiding the detour Above the general three-phase 1. The railway system's electrical system is characterized by large rapid load variations and is therefore designed to swallow this, so it can also swallow a generation with comparable power variations. which can be black for weak general three-phase nat in often sparsely populated areas where wind turbines are installed. Due to large variations in wind speeds, the greatly varying power generated by the wind power generators can thus be at least partially absorbed by the single-phase path supply line. It may also be the case that the general three-phase 7-shaft voltage network is not able to receive the additional power generated by wind turbines set up at a location thanks to this night, but it is possible for the connection of the wind turbines to the DC converter to utilize the wind power energy. despite alit by) take the path feed line take care of it. By generating and reorienting, Ors' coordination gains that are cost-saving are coordinated. Finally, bide wind energy and electrified railway are associated with major environmental disadvantages, which is why a combination of these is particularly advantageous.

Uppfinningen är givetvis inte p5 n5got satt begransad till den ovan beskrivna foredragna utfOringsformen, utan en mangd mojligheter till modifikationer darav torde vara uppenbara for en fackman p5 omradet, utan att denne W. den skull avviker fr5n uppfinningens grundtanke. The invention is, of course, not limited in any way to the preferred embodiment described above, but a multitude of possibilities for modifications thereof would be obvious to a person skilled in the art, without this being deviating from the basic idea of the invention.

Exempelvis skulle vindkraftsgeneratorerna kunna bytas ut mot andra generatorer, vilka foretradesvis ar av den typen som kan drivas battre om deras varvtal tillats fluktuera och avvika fr5n det allmanna trefas-natets frekvens, sAsom vattenkraftsgeneratorer, men aven andra generatorer kan komma i frbga. For example, the wind power generators could be replaced by other generators, which are preferably of the type that can be operated better if their speeds are allowed to fluctuate and deviate from the frequency of the general three-phase, such as hydropower generators, but other generators can also be used.

Det yore fullt mojligt att utelamna transformatorn 7, s5 att den andra stramriktaren levererar en enfas-vaxelspanning med lamplig niv5 fOr det utmed kontaktledningen lopande vaxelspanningstransmissionsnatet, transformatorn 11 och dá aven natet 8 skulle kunna utelamnas, sá att enfas-vaxelspanningen fr5n omriktaren skulle efter transformering i transformatorn 7 matas direkt till kontaktledningen 9, och det yore aven mojligt att ta bort saval de bada transformatorerna 7, 11 som ledningen 8 och 15ta omriktaren mata elektrisk effekt direkt till kontaktledningen. It is quite possible to omit the transformer 7, so that the second inverter supplies a single-phase AC voltage with a suitable level for the AC voltage transmission current running along the contact line, the transformer 11 and then also the 8 could be omitted, so that the single-phase AC voltage after the inverter in the transformer 7 is fed directly to the contact line 9, and it is also possible to remove both the transformers 7, 11 as the line 8 and 15. The converter supply electrical power directly to the contact line.

Vilka andra spanningsnivaer och frekvenser som heist an de 35 ovan namnda ligger aven inom uppfinningens ram. 8 Det papekas att den elektriska effekten i vissa fall kan matas at andra hall an vad ovan sagts och exempelvis matas elektrisk effekt fran fordonet 10 till kontaktledningen 9 vid bromsning av fordonet. Likas6 kan exempelvis effekt matas s6val fr6n det all- manna vaxelspanningsnatet till likspanningsmellanledet som fran det senare till det allmanna vaxelspanningsnatet. 9 What other voltage levels and frequencies are mentioned above are also within the scope of the invention. It is pointed out that in some cases the electrical power can be supplied to other halls than what has been said above and, for example, electrical power is supplied from the vehicle 10 to the contact line 9 when braking the vehicle. Similarly, for example, power can be supplied from the general AC voltage network to the DC intermediate as from the latter to the general AC voltage network. 9

Claims

Patent claims

System for transmitting electrical power to a single-phase alternating voltage Leading overhead contact line (9) for interrogating vehicles comprising a converter (4) with a first converter (3) connected to a general three-phase alternating voltage night (1), a second converter (6) connected to a single-phase alternating voltage night (8, 9) and a direct voltage intermediate link (5) between the strip rectifiers, characterized in that at least one generator (12-14) of alternating voltage is connected via a current converter (15-17) to said intermediate link for inputting electrical power to the general three-phase alternating voltage network and / or the single-phase alternating voltage network for saving vehicles.

Plant according to claim 1, characterized in that said generator (12-14) is of the type whose speed and thus frequency of the alternating voltage generated therefrom is allowed to vary according to prevailing conditions, in order to achieve as high efficiency as possible at different conditions at its energy generation.

Plant according to claim 1 or 2, characterized in that said generator (12-14) is a wind power generator.

Plant according to any one of claims 1-2, characterized in that said generator is a hydropower generator.

Installation according to one of Claims 1 to 4, characterized in that several generators (12-14) are connected to the intermediate link (5) which forms a common so-called direct current busbar.

Installation according to any one of claims 1-5, characterized in that said intermediate link (5) comprises a direct voltage transmission line arranged along a path for sparging vehicles (10) parallel to said contact line (9) arranged to transmit electrical power to the contact line ( 9) via conversion to alternating voltage at different points along it.

Plant according to any one of claims 1-6, characterized in that said second converter (6) is arranged to convert the direct voltage of the intermediate joint (5) to a single-phase alternating voltage lamped for the contact line (9) and supply single-phase alternating voltage directly to the contact line. .

8. A system according to any one of claims 1-6, characterized in that it comprises a transformer (7, 11) arranged between the second converter (6) and the contact line (9) to show that the level of the single-phase AC voltage generated by the converter modified to the desired voltage level of said contact wire.

Plant according to any one of claims 1-6, characterized in that it comprises a transformer (7) arranged to convert the single-phase AC voltage generated by the second converter (6) to a level significantly higher than the voltage level of the contact line (9) and Transfer this high alternating voltage to a high voltage transmission night (8) arranged to distribute electric power to stations (11) located along the contact line for transforming this high voltage to a level lamped for the voltage of said contact line and supplying electric power thereto.

Plant according to any one of claims 1-9, characterized in that the second converter (6) is arranged to convert the direct voltage of the intermediate link (5) to a single-phase alternating voltage with a different frequency than that of the general three-phase alternating voltage ( 1).

Plant according to any one of claims 1-10, characterized in that the second converter (6) is arranged to convert the direct voltage of the intermediate link (5) to a single-phase AC voltage with a lower frequency than that of the general three-phase AC voltage (1). ).

Plant according to one of Claims 1 to 11, characterized in that the second converter (6) is arranged to convert the direct voltage of the intermediate link (5) into a single-phase alternating voltage with a frequency of approximately 16 2/3 Hz or approximately 25 Hz.

Plant according to any one of claims 1-9, characterized in that the second converter (6) is arranged to convert the direct voltage of the intermediate link (5) into a single-phase alternating voltage with the same frequency as that of the general three-phase alternating voltage (1).

Plant according to any one of claims 1-13, characterized in that the second converter (6) is arranged to convert the direct voltage of the intermediate link (5) to a single-phase alternating voltage with a frequency of about 50 Hz or about 60 Hz. -Vi, 13 16 7