DEP0039939DA - Installation on synchronous-synchronous converter groups for the rigid coupling of alternating current networks - Google Patents

Description

IktiengeseIlsoaaft Brown, Boveri & Cie _ef BADM (Switzerland)

Establishment of a synchronous-synchronous converter group for the rigid coupling of alternating current networks «

The invention "refers to devices on synchronous synchronous Ümformergruppen for the rigid coupling of WechselBtroBmetaen _9, for example an industrial Netses with a Bahnaetz low frequency. Eb is the Hatur the electrical Terhiltnisse _s that in the networks occurring Laststöeee in the first Zeitahschnitten the the Netsie-coupling converters to be transferred. this is especially the case when the coupled setae with hydraulic turbines auegerüstet as primary machines Blnd ₈ Reafctions time of the latter _s which does not allow in fact of a QröSseiiordnung receive the Laststöeee in time, so that calibration this "transferred to the rigid convertor is this results in that the conversion group muse be plenty of oversized with strong LaststBssen in

ρ 39939 VIIId / 21d 2 D July 21, 1950.

"two Ietaen the step-out en au Yerhtiten _e In Pig 1, the Zeictoung is given of the course of the power P ~ drehf'eld via the convertor as a function of Polradstellung relative to the stator. In a normal constant / agitated Synohronmaschine is" at Sormallast the angle between pole wheel and stator rotating field about 30 ° - 40 °, in order to Laatstosse Terme Idea _j should up the turbines of the disturbed Metzes ar as soon * that this is Linkel not exceeded. This angle changes look after the relationship;

From this time derives itself;

1 df t.

2 'dt * ¹

"1

df »

German

where f is the letzfreguena and t ^ the time at which the means etatische Grenzwihkel (90 °) is reached.

If on a Synchroaaaschiiie a Laetetoss

occurs ₉ so the frequency change takes place respectively. the change in spatial angular speed according to Beaiehunci 5

d "AMd ₉
dt 0

where Md is the change in torque and (Q? · the Maasen inertiaBmoment .

Multiplied by the ratio of the number of poles k

this results in a change in the angular speed in electrical degrees:

(LIMA = k,% r dt dt

Loss angle in electrical degrees with respect to a rotating field at a constant angular velocity is

The expression shows that this angle is tuadra-

init table would increase over time, during which there is a delay or acceleration, "Here on the other hand, the Reguliergeechwindigkeit of _l's urbine hydraulic ferhältniese is limited with regard to Bndere has aan interests, Eiaxiaal permissible angle to vergrössem. This is where the irfindttng comes in *

The invention relates to a device

to synchronous-synchronous converter groups for the tight coupling of alternating current networks to improve the power transmission in the event of load surges, in particular for hydraulic primfibrmasohinen. It _is? Bind that means are provided which _s the change in converter assembly Laststose the excitation of the two synchronous machines in addition AbMngigkeit of the power to be transmitted so that the Iippwinkel of the two synchronous machines is greater than 90 °.

In Flg. 2 of the drawing shows an exemplary embodiment of the eehematiech invention.

With Sg and the two Synchronmschinen of the Set and Ig rigidly coupled, convertor, respectively. The excitation machines and Bg of the synchronous machines each have two excitation windings e, and e " and Z ₁ and z _? ,

of which are e ^ and e ^ for a constant excitation of the Erregerniaschinen from the Help network H and and for an additional energization in response to the transmitted by the transducer to power determined * The additional excitation of the two synchronous machines, by measuring the au be transmitted power or the wiafcels between the pole wheel and the stator rotating field or the torque on the shaft of the converter B can be changed.

In the example, the additional excitation of the excitation machines and E ^ is changed as a function of the angle between the pole wheel and the Staader Drehfeid with the help of the rolling sector regulator R, whose working winding depends on the voltage between the voltage that reflects the vector position of the - ^fc Olradee and an auxiliary winding on the armature of the exciter * » Machine E ₁ connected slip rings and on the shaft of the transformer group and the separate voltage of the converter W, which is primarily connected to two phase lines of the network, is fed. The secondary winding of the converter W and the working winding of the glider S are in series. The additional excitation reduces the sinusoidal power characteristic 1 resulting from the constant excitation (Fig. _E IjL in such a after line 2 (Fig. 1) * The tilt angle of the two synchronous machines is increased from 90 ° to 120 °. This saves time to which can be the rush associated pa ~ rall el readjust to end η Primarsasehinen ₉ whereby an overloading of the converter easily avoided * in order to respect is an advantage of the Dimensionieruag ^ _s mforaergruppe

Instead of changing the excitation magnet of both synchronous machines together with one controller, as in the example, each synchronous machine can just as easily be changed separately in its
Astray gong affected are _e The in Ausfilhrungsbeispiel
Wälzsektorregler used can by another desire any known type per se ereetst are _e

Claims (5)

Patent claims: 1.) Establishment of Synehr on-L \ ynehron converter groups for the rigid coupling of alternating electricity networks for improvement the power transfer in the event of load surges, in particular for networks with hydraulic primary machines, characterized in that means are provided which, in the event of a load surge, excite the two Bynobron machines of the converter group, depending on the power to be transmitted, so that the tilt angle of the two synchronizing machines is greater than 90 ° » 2.) Device according to claim 1, characterized in that the change in the additional excitation of the two Synchronous machines of the converter group takes place as a function of the angle between the rotor and the rotating field of the stator, 3.) Device according to claim 1, characterized in that the change in the additional excitation of the two synchronous machines the converter group as a function of ^! there is torque on the shaft of the converter. 4.) Device according to claim 1, characterized _f in that the additional excitation of the synchronous machine of the converter assembly is varied separately by a respective controller for each synchronous machine. 5.) Device according to claim 1, characterized in that the additional excitation of the synchronous machines of the converter group is changed by a controller for both synchronous machines together, Public company BEOLM, BOTBRI & CIE.