CS203281B1

CS203281B1 - Connection for recuperation of periodically repeating impulses of excessive energy from the commutation circuits and from the circuit of induction load of the capacitous tyristor convertor

Info

Publication number: CS203281B1
Application number: CS554677A
Authority: CS
Inventors: Imrich Pokorny
Original assignee: Imrich Pokorny
Priority date: 1977-08-24
Filing date: 1977-08-24
Publication date: 1981-02-27

Description

Vynález sa týká výkonových tyristorových meničov s rekuperačným autotransformátorom.The invention relates to power thyristor converters with a regenerative autotransformer.

Příklad doteraz známého zapojenia jednofázového striedača s rekuperačným autotransformátorom, ktorý sa v literatúre uvádza pod názvom striedač Mc. Murray-τBedford je. na obrázku 1. Nevýhodou uvedeného zapojenia je, že měnič frekvencie podTa Mc. Murray — Bedforda sa může ekonomicky realizovat len pre vyššie frekvencie. Stavba meniča frekvencie sa stává neekonomickou pre nižšie frekvencie, napr. pod 10 Hz, pretože typový výkon autotransformátora narastá s klesajúcou frekvenciou striedača. Nárast typového výkonu autotransformátora je zapříčiněný tým, že autotransformátor je připojený trvale k záťaži paralelné a počas nárastu záťažného prúďu narastá aj nežiadúci magnetizačný prúd autotransformátora, ktorý vzhladom na celkovú indukčnost autotransformátora je pri vyšších frekvenciach zanedbatelné malý, no pri nízkých frekvenciach má rozhodujúci vplyv na prierez železného jadra autotransformátora, a tým aj na rozměry, váhu a cenu zariadenia.An example of the hitherto known connection of a single-phase inverter with a regenerative autotransformer, which is referred to in the literature as the inverter Mc. Murray-τBedford's. The disadvantage of said circuitry is that the frequency converter podTa Mc. Murray - Bedford can only be economically realized for higher frequencies. The construction of the frequency converter becomes uneconomical for lower frequencies, e.g. below 10 Hz, because the type power of the autotransformer increases as the frequency of the inverter decreases. The increase in the type power of the autotransformer is caused by the fact that the autotransformer is connected permanently to the load in parallel and during the increase of the load current the undesirable magnetization current of the autotransformer increases. the iron core of the autotransformer, and hence the size, weight and cost of the device.

Vyššie uvedený nedostatok odstraňuje vynález, ktorého podstatou je zapojenie pre rekuperáciu periodicky sa opakujúcich.The above-mentioned drawback removes the invention, which is based on a circuit for recuperation of periodically repeating.

impulzov prebytočnej energie z komutáčných obvodov a z obvodu induktivnej záťaže výkonového tyristorového meniča dc napájacieho zdroja, vyznačujúce sa tým, že jeden vývod . vinutia .rekuperačného trans formátora s nižším počtom závitov je spojený s anodou prvej diody a_: katodou druhej diody, pričom jeden , vývod vinutia rekuperačného transformátora s vyšším počtom závitov je spojený s anodou _; tretej diody a s katódou štvrtej diody, kým kató dy prvej a tretej diody a anody dr,uhej a štvrtej diody sú navzájom spojené a druhý vývod vinutia rekuperačného- transformátora s vyšším počtom závitov je spojený se středným vývodom symetricky zdvojeného napájacieho zdroja a druhý vývod vinutifrekuperačného transformátora s nižším počtom závitov je spojený so stredom komutačnej indukčnostl.pulses of excess energy from the commutating circuits and the inductive load circuit of the power thyristor converter dc of the power supply, characterized in that one outlet. .rekuperačného trans formatter winding with a lower turns number is connected to the anode of the first diode, _and: the cathode of the second diode, wherein one terminal of the transformer winding of the recovery of a higher number of windings is connected to the _anode; a third diode and a cathode of a fourth diode, while the cathodes of the first and third diodes and the anodes dr, uhey, and the fourth diode are connected to each other, and the second winding of the high-number with a lower number of turns it is connected to the center of the commutation inductance.

Novým zapojením pre rekuperáciu periodicky sa opakujúcich impulzov prebytočnej energie z komutačných obvodov ε z obvodu induktivnej záťaže sa vylúči priamy magnetizačný prúd transformátora z jednosměrného napájacieho zdroja, pričom nové zapojenie plní všetky funkcie povodného zapojenia, tj. umožní po komutácii přenos prebytočnej energie z komutačných obvodov a z obvodu induktivnej zá203281A new circuit for recuperation of periodically repetitive pulses of excess energy from the commutating circuits ε from the inductive load circuit eliminates the direct magnetizing current of the transformer from the DC power supply. will allow the transfer of excess energy from the commutation circuits and the inductive circuit after commutation

03 ťaže do napájacleho zdroja, pričom nevznikajú nebezpečné prepStia ani v obvodocň komutačných, ani v obvodoch záťaže. Nové zapojenie odstraňuje dolné frekvenčně obmedzenie meničov frekvencie s rekuperačným autotransformátorom a nový měnič frekvencie, ktorý vznikol aplikáciou vynálezu, umožňuje štvorkvadrantovú prevádzku sústavy měnič frekvencie a indukčný motor s plynulým prechodom cez nulovú rýchlosť otáčania, čo doterajšie menlče s nepSťovým medziobvodom tohto typu neumožnili. Transformátorom s vinutiami podlá vynálezu sa získal kvalitativně o rád vyšší měnič frekvencie, lebo vynález prakticky vylúčil nežiadúci priamy magnetizačný prúd transformátora, a preto je možné postaviť měnič frekvencie hospodárné bez ohfadu na dolné obmedzenie frekvencii. Takto vzniknutý nový měnič frekvencie má předpoklady pre široké využitie v praxi pre pohon malých a středných výkonov.03 does not cause dangerous surge in either commutating circuits or load circuits. The new circuit eliminates the lower frequency limitation of the frequency inverters with the regenerative autotransformer, and the new frequency converter created by the application of the invention allows four-quadrant operation of the frequency converter system and induction motor with a smooth passage at zero speed. The winding transformers according to the invention have obtained a qualitatively higher frequency converter as the invention practically eliminated the unwanted direct magnetizing current of the transformer, and it is therefore possible to construct a frequency converter economically without regard to the lower frequency limitation. The new frequency converter thus created has the prerequisites for wide application in practice for driving small and medium power.

Na pripojenom výkrese sú znázorněné: Obr. 1 povodně zapojenie striedačaThe attached drawing shows: FIG. 1 floods connection of the inverter

Mc. Murray — Bedford,Mc. Murray - Bedford

Obr. 2 zapojenie nového typu meniča podfa vynálezu,Fig. 2 shows a new type of converter according to the invention,

Obr. 3 dielčia časť zapojenia podía vynálezu.Fig. 3 shows a part of the circuit according to the invention.

Rekuperačný transformátor s vinutiami 1, 2, ktorého vinutia sú s dvomi dvojicami diód 3, 5 a 4, 6 v zapojení podía obr. 3 má tieto vlastnosti:A regenerative transformer with windings 1, 2, the windings of which are connected with two pairs of diodes 3, 5 and 4, 6 according to FIG. 3 has the following characteristics:

Pri přenose energie z jednosměrného napájacieho zdroja do záťaže sú vinutia 1 a 2 rekuperačného transformátora oddělené závěrně polarizovanými diodami 3, 4, 5, 6 od výkonových obvodov meniča frekvencie.When the energy is transferred from the DC power supply to the load, the windings 1 and 2 of the regenerative transformer are separated by the reverse polarity diodes 3, 4, 5, 6 from the frequency converter power circuits.

Pri přenose energie z obvodov komutačných, alebo z obvódov záťaže do napájacieho zdroja, energia sa prenáša cez rekupeřačný transformátor s vinutiami 1 a 2, pričom napatie na vinutí 2 rekuperačného transformátora s vyšším počtom závitov je konstantně napatie napájacieho zdroja a napatie na vinutí 1 rekuperačného transformátora s nižším počtom závitov je určené transformačným prevodom, čo znamená, že v obvodoch meniča frekvencie nevznikajú pri komutácii tyristorov nebezpečné prepatia. Rekuperačný transformátor s vinutiami 1 a 2, diódy 3, 4, 5, 6 třeba dimenzovat na výkon, ktorý rezultuje z komutačného napatia a prúdu tyristora, nie je třeba uvažovat magnetizačný prúd z napájacieho jednosměrného zdroja, preto transformátor sa dá bez ohl'adu na dolný frekvenčný rozsah vždy hospodárné navrhnúť na rekuperovaný výkon.When transferring power from commutating circuits or from load circumferences to a power supply, the energy is transmitted through a recuperation transformer with windings 1 and 2, wherein the voltage at the winding 2 of the regenerative transformer with a higher number of turns is constant the power supply voltage and voltage at the winding 1 with a lower number of turns, it is determined by a transformer drive, which means that dangerous overvoltages do not occur in the frequency converter circuitry when commuting the thyristors. Recuperative transformer with windings 1 and 2, diodes 3, 4, 5, 6 should be designed for power resulting from commutating voltage and thyristor current, there is no need to consider the magnetizing current from the DC power supply, so the transformer can be lower frequency range always economical to design for recovered power.

Nový typ meniča frekvencie podía vynálezu obr. 2 v žiadnom spínačom stave tyristorov striedača 7, 8 nevytvoří vodivú cestu z jednosměrného napájacieho zdroja cez vinutia transformátora 1, 2 a preto žiaden spínací stav nie je časové obmedzený. Rekuperačný transformátor umožňuje přenos impulzov energie od striedača do jednosměrného medziobvodu, tj. umožňuje rekuperáciu prebytočnej komutačnej energie z komutačných obvodov, ako aj rekuperáciu energie z indukčnosti záťaže. Aplikáciou vynálezu možno vybudovat trojfázový měnič frekvencie bez frekvenčného obmedzenia pre napájanie indukčných motorov.A new type of frequency converter according to the invention FIG. 2 in any switch state of the thyristors of the inverter 7, 8 does not create a conductive path from the unidirectional power supply via the windings of the transformer 1, 2 and therefore no switching state is limited in time. The regenerative transformer allows the transmission of energy pulses from the inverter to the DC link, ie. it allows recovery of excess commutation energy from commutation circuits as well as energy recovery from load inductance. By applying the invention it is possible to build a three-phase frequency converter without frequency limitation for feeding induction motors.

Claims

The new wiring eliminates the lower frequency limitation of frequency converters with a re-autotransformer and the new frequency converter resulting from the application of the invention allows for a quad-quadrant frequency converter. a frequency converter and an induction motor with continuous passage through a zero speed rotation, which have not allowed the prior art converters to a non-band intermediate circuit. According to the invention, the winding transformer has been qualitatively obtained with a higher frequency converter, since the invention has practically eliminated the undesired direct transformer magnetization current, and therefore it is possible to set up the frequency converter economically with a low frequency limitation. utilization in practice of a small and medium power drive. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 flood connection of Mc inverter. Murray-Bedford, FIG. 2 shows a new type of converter according to the invention, FIG. 3 shows a partial section of the embodiment of the invention. The regenerative transformer with windings 1, 2, whose windings are of two characteristics with the two dual idioms 3, 5 and 4, 6 in the connection: When the energy is transferred from a one-way to a power source, the transformer windings 1 and 2 are separated separately. polarized diodes 3, 4, 5, 6 frequency converter power circuits. When transmitting energy from commutating circuits or load encoders to a power supply, the energy is transmitted through a recuperation transformer with windings 1 and 2, wherein the winding 2 of the recirculation transformer with a higher number of turns is a constant voltage supply to the power supply anapat. on the winding 1 of the recirculating transformer with a lower number of turns is determined by a transformation gear, which means that there is no dangerous overload in the circuitry of the frequency converter during commutation of thyristors. The regenerative transformer with coils 1 and 2, the diodes 3, 4, 5, 6 need to be dimensioned to the power resulting from the co-mutation voltage and thyristor current, there is no need to consider the magnetizing current from the solder unidirectional source; at the low frequency range always economical to throw on the regenerated power. The new type of frequency converter according to FIG. 2 in no switching state of the inverters 7, 8 does not form a conductive path from the unidirectional power supply of the transformer winding 1, 2 and therefore the switching state is not limited in time. energy pulses from the inverter to the one-way intermediate circuit, ie, allows for the recovery of excess commutation energy from the commutation circuits, as well as the energy recovery from the load inductance. By applying the invention, a three-phase frequency converter can be built without frequency limitation for feeding induction motors. SUBJECT CONNECTION for recuperation of periodically repetitive pulses of surplus energy from commutation circuits and from inductive load circuit of thyristor power supply to the power supply, characterized in that one outlet (1) of recuperative transformer with lower number of threads connected to anode of first diode (3) and ka the second diode (4), wherein one of the windings (2) of the recirculation transformer with the higher number of turns is connected to the anode of the third diode (5j and the cathode of the fourth diode (6) while the cathodes of the first and third diodes (3 , 5) and the anodes of the second and fourth diodes (4, 6) are connected to each other and the second outlet (2) of the regenerative transformer with a higher number of turns is connected by an eccentric outlet of a symmetrically doubled power supply and a second winding outlet (1) of a recirculation transformer with a lower number of turns is connected to the medium-inductance (9) 1 sheet of drawings Severography, η ΰ & γοΰ 7, Most