SU855920A1 - Device for current stabilizing of syncronous generator - Google Patents

Description

(54) DEVICE CURRENT CTAHi.in ALUll 1 CPUiXPOtiHOrO

GENERDTO;

one

The invention relates to the automatic regulation of synchronous generators operating from primary piston engines, when they are operated in parallel with the network or between themselves, and more specifically to current stabilization devices built into the excitation systems of synchronous generators.

Current stabilization devices for synchronous generators powered by prime movers are known which contain a reactive current sensor whose output is included in the negative feedback circuit of a voltage corrector of the generator excitation system. Such a connection of the reactive current sensor provides the slope of the characteristics U (, f (J ,.) and current stabilization 1.

Current stabilization devices used for synchronous generators of mobile power plants with a nominal frequency of 50 Hz and a shaft speed of the prime mover 1500 rpm are also known. Generators, as a rule, have a damper winding. Therefore, the forced oscillations of the stator current during parallel operation of mobile power plants caused by non-4.

paBKCiMCpirocTbiO the stroke of primary engines, extinguished by the damper windings of generators. In addition, the rotors of the generators .via.ioMiic.iemiocTH poles (four) and a significant margin for the corner with a bathtub .i bath x 2 |.

However, if an ego device is used for mobile power plants with an increased nominal voltage frequency, for example 400 Hz, then it is possible (with certain ratios of the parameters of the primary motor controller and excitation systems) the occurrence of parallel current oscillations of generators with amplitude 2-4 3 „o„, and a frequency of 6-7, on which oscillations with a smaller amplitude but a higher frequency are superimposed. This also contributes to

15 that high-frequency generators do not, as a rule, have a damping winding, since it is structurally difficult to position it on a rotor with thirty-two poles and, moreover, massive pole shoes

-K will shield the damper winding from the magnetic field of the stator.

Closest to the invention to the technical essence is a device for

current stabilization of the sip-ripps-o rciUp torus, containing / ipchi1 ;; ch.ch1 (ich :. tgzh; exit to iosto 1I) ohm ajKi ;, libixi ;;:, which is connected to IUMM orniuurie.ihnoy reverse 3 () 36 МP01И1Я

generator 3.

However, it is the device) YAR S; b: -gis: Va.G

current damping crarfina iijii-i i) r, i;

The purpose of the invention --- ЦЧ111 (: ni n1 - ,, the characteristic characteristics of the goyer;) 1; after the death of the unwavering oscillations of the php: stat. Caused by iravno.) Art. 10 xo; i;:: i lu-rjvichnyh iori1nevyh motor.ip-i liiJii couples illyelnom work synchronous gssm-Yyguoi increased frequency.

The supplier of the current S1abi device; that is, the synchronization of the 5ator synchronization gene, supporting UITSUK lio.i of the current geierato |) and from the output) e (.). 1; a constant current in the circuit of the 1st feedback of the excitation system., Is equipped with a bandpass filter with a passband. Corresponding to the frequency of the fundamental harmonic from the harmonics of the varying composition of the harmonics ..: 1Nyusha mine of the primary turism dmgate. a voltage divider and a capacitor connected in parallel to the resistor of one arm of the dividers, the output of the total current sensor passing through the wires to the HOJIOCOBOMV series-connected filter and voltage separator and the i-iCi-op second splitter stresses BK.:IK). ezhdu input circuit klemma.mi OTJIHtsatelnoy feedback.

FIG. 1 shows the e,; 1ec1p1meska scheme of the proposed device tokony stabilization; in fig. 2 shows the dependence of the gain factor on the value of negative feedback on the frequency of the oscillating current.

The device contains a current sensor n (; jnioio current, consisting of a current transformer 1 connected to one of the phases of generator 2, shunt 3, step-up voltage transformer 4, diode rectifying bridge 5, choke 6 and capacitor 7, forming a l-shaped band L0 ({: il, resistor 8 and resistor 9, which form a voltage divider, switch on the negative feedback circuit of the network. We are 10 in: a bump affecting the excitation winding 11 and capacitor 12. connected in parallel with resistor 8 de .lpte.ch voltage.

The device operates as follows. The phase current of the generator is converted by transformer 1 and shunt 3 into a voltage proportional to the magnitude of the phase current. The voltage received is transformed by a transformer 4 and the rectifier is flushed with a rectifier 5, the output of which is obtained by a sum of two voltages: permanent voltage; proportional to the average current, and alternating, normal to the magnitude of the current oscillation. The LC filter without wasps .laujC: H; i;: rgl h: r; ae iiepeMeHiiyso was ioni, i anda; Particularly (First (T (; i, corresponding to 1); e;) Ibm lemie sb; xc yes) l filter arrives at.; Ie.,: Ij of the mappings. Image (.1vany reznstorami and, -: 9. Condtc 2, together with g} e: i1Gg01; (. L: 8 forms the phy. M B1,1 high portions (i, i; i oco6;: TB; i yci-iJjeHHH) of the second and thr; its thermopic components oscillate; i m: stator. The band-pass filter reduces the CIMJC resistance; C-lzleniya with the passage of the black: -; Of this signal, proportional to.; To the full current of the ge1-1 generator, with a frequency of k: sb1: s, corresponding to 1 y: o1tsey first harmonic; ike variable at the time of the NEVRICHPO1CH) dv -; gatel.

uein () T) ipate, contact of the generator excitation system, excitation of a HCjiaTopa with: and; kaets and oscillations; n current, caused by the harmonic of lumeite dv) gate .1I, gasput. More harmonics with (;; put to - | qie oscillations: 1n current (second, third, and so on. Garm (yaiki)) are weakened by 1 bandwidth -1 p ;; to this: i.e. are suppressed) , n, sing, mark, and meanwhile, they, too, have violated a stable distribution of load me / ku 1st-eleventhors. For

5 suppression more in;:, 1С (zhih armonik one nleko resiscorny healer is protected by kondeasgior, the whole reason is which ;; is chosen such that (Hi together with the other shoulder of the divider plays the role of the filter BbieoKi-ix oftenT: which as 6iii amplifies the higher nrm () nicknames weakened by a band-pass filter, feeds them to the input, iieni: negative feedback, and the excitation system supplies,:; it oscillates from 1 to 2 t (lcha and more, higher tOTbi, 1 airjet iia main harmonic,

 the nature of the dependence of the coefficient of the amplification of the device on the frequency of the coilsbane: current nl, Ist) FIG. 2. The coefficient usi .leiii} of the device on the frequency, corresponding to the 1X-hervoy, the second i-; the third gar, the unit, is higher than the coefficient of earning for it, the value of T ((each corresponding to the frequency equal to the value)).

The current device of current stabilization (() allowed to ensure the stabilization of loads during the parallel operation of the snapshots of the newer circuit of the newer), working from the primary porn engines with the effective weakening of the weakening of the non-attenuating coaxial motors. stator current, unequal, with the dimensionality of the course of the nervous motor, for any correlation of the parameters of the primary motor controllers and generators. This avoids the failure of regulators on the primary Alp units. generators in those cases where, with the existing current stabilization devices, continuous oscillations occur, which in turn shortens the development and testing time of mobile electric devices and electrical TOBs.

Claims (1)

Claim A device for current stabilization of a synchronous generator, comprising a generator full current sensor with a direct current output in the negative feedback circuit of the excitation system, characterized in that, in order to improve the generator output characteristics by attenuating undamped stator current oscillations caused by uneven stroke of the primary piston engines with parallel high-frequency synchronous generators, equipped with a bandpass filter with a passband corresponding to the frequency of the main harmonic the spectra of the 'harmonics of the variable moment component of the primary piston engine, a resistor voltage divider and a capacitor connected in parallel to the resistor of one arm of the divider, the output of the total current sensor connected to a series-pass bandpass filter and voltage divider, and the resistor of the second arm of the voltage divider input terminals of the negative feedback circuit.