Научная статья на тему 'Boshqariluvchan chiqish kuchlanishli tok o‘zgartkichlarining dinamik tavsiflari'

Boshqariluvchan chiqish kuchlanishli tok o‘zgartkichlarining dinamik tavsiflari Текст научной статьи по специальности «Техника и технологии»

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Ключевые слова
asinxron motor / boshqariluvchan chiqish kuchlanishli tok o‘zgartkichi / magnit maydon / ishchi tavsiflar / tok / kuchlanish / quvvat / tezlik va moment. / induction motor / variable output current adapter / magnetic field / performance / current / voltage / power / speed and torque.

Аннотация научной статьи по технике и технологии, автор научной работы — Boixanov Zailobiddin Urazali O‘G‘Li

Ushbu maqolada asinxron motor reaktiv quvvatini nazorat qilish va boshqarish uchun boshqariluvchan chiqish kuchlanishli tok o‘zgartkichidan foydalanildi. Tok o‘zgartkichining ishonchliligi, sezgirligi, o‘lchash aniqlik va xatoliklarining dinamik tavsiflari Simulnik dasturidan foydalanilgan holda olindi. Tok o‘zgartkichlari, asosan, asinxron motor elektr ta’minoti tizimining normal barqaror ish rejimi davrida ishlaydi. Bu rejimda ba’zi shartli chegaralar bilan tok o‘zgartkichlarini tadqiq etishda kirish tokining minimal va maksimal qiymatlari qabul qilinadi, buning uchun aniqlik sinfi (0,1‒1,2)∙Inom deb olinadi. Elektr jihozlar va tarmoqlardagi shikastlanishlar asinxron motor elektr ta’minoti tizimining halokatli ish rejimiga olib keladi. Bu holda tok o‘zgartkichlari dinamik rejimda ishlaydi. Asinxron motorda qisqa tutashuvlar elektromagnit tok o‘zgartkichlarining dinamik rejimlarda ishlashiga olib keluvchi asosiy sababdir. Elektromagnit tok o‘zgartkichlarining bunday rejimda ishlashi boshqaruv tizimi sxemalaridagi ishlash shartlaridan sezilarli farq qiladi. Agar elektromagnit tok o‘zgartkichlari o‘lchov maqsadida ishlatilsa, odatda, nominaldan oshmagan birlamchi tokda ishlashi talab etiladi. Bunda asinxron motorning boshqaruv tizimlarida qo‘llanuvchi elektromagnit tok o‘zgartkichlari nominaldan ancha katta toklarda, o‘tish rejimi sharoitlarida, masalan, qisqa tutashuv va shikastlanish hollarida o‘z funksiyalarini bajarishi shart.

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Dynamic characteristics of controlled output voltage converters

This article uses a controlled output voltage-to-current converter to control the reactive power of an induction motor. The dynamic characteristics of the current converter were obtained using the Simulink program, taking into account reliability, sensitivity, measurement accuracy and error. Current converters are mainly operated during normal stable operation of the power supply system of an asynchronous motor. In this mode, when studying current transducers with certain conditional limits, the minimum and maximum values of the input current are accepted, for which the accuracy class (0.1‒1.2)∙Inom is set. Damage to electrical equipment and networks can lead to emergency operation of the power supply system of an asynchronous motor, in which case the current converters operate in dynamic mode. Short circuits in an asynchronous motor are the main reason for the operation of electromagnetic current converters in dynamic modes. The operating conditions of electromagnetic current adapters in such modes differ significantly from the operating conditions in the control system circuits. If electromagnetic current adapters are used for measurement purposes, they are usually required to operate at a primary current not exceeding the rated current and must perform their functions in the event of a fault.

Текст научной работы на тему «Boshqariluvchan chiqish kuchlanishli tok o‘zgartkichlarining dinamik tavsiflari»

ТЕХНИКА ФАНЛАРИ ТЕХНИЧЕСКИЕ НАУКИ TECHNICAL SCIENCES

d ) https://dx.doi.org/10.36522/2181-9637-2022-2-14 UDC: 621.398

BOSHQARILUVCHAN CHIQISH KUCHLANISHLI TOK O'ZGARTKICHLARINING DINAMIK

TAVSIFLARI

Boixanov Zailobiddin Urazali o'g'li, Andijon mashinasozlik instituti doktoranti, ORCID: 0000-0001-7915-4210, e-mail: zaylobiddin1992@gmail.com

Kirish

Uch fazali asinxron motor reaktiv quvvatining nosimmetrik kattaliklarini nazorat qilish va boshqarish uchun stator chulg'amidan nosimmetrik i1, i2, i3, birlamchi toklar o'tishi natijasida hosil bo'lgan magnit oqimlar ta'sirida tok o'zgartkichi o'lchov chulg'amlari chiqishlarida u (t), u (t), ичик 3(t) kuchlanishlar olinadi. Bu signal ko'rinishidagi chiquvchi kuchlanishni quyi-dagicha yozib olamiz [1, 6-b.]:

U4uk3 (0 = ~Ry3 " КикЗ (0 —

d(P2(t) + w, —+ w. d<m.

dt 5 dt 6 dt '

d01(t) + w, —+ w. d03(O.

dt 4 dt 6 dt '

<*LJf) d(I\{t) + w, —— + w. d<P2(t).

dt 4 dt 5 dt '

(1)

Bu yerda R„„, Rn, R„ L^, Rn, R_ - uch fazali

J y.1 y.2' y.3' y.1 y.2' y.3

tok o'zgartkichining nosimmetrik aktiv va induktiv qarshiliklari; w.x, Wy2, Wy3, - o'lchov elementi sifatidagi o'ramlar soni.

Uch fazali asinxron motorlar kuchla-nishining nosimmetriklik darajasini tavsif-lovchi asosiy sifat ko'rsatkichini teskari ketma-ketlikdagi kuchlanishning koeffitsienti orqali aniqlash mumkin:

k

K2U ~ U-i

(2)

bu yerda U2 U1 - mos ravishda to'g'ri va teskari ketma-ketliklar kuchlanishi.

Uch fazali asinxron motorlarining nosimmetrik kuchlanishi sharoitida ishlashi, qo'shimcha ravishda, teskari ketma-ketlikdagi

Annotatsiya. Ushbu maqolada asinxron motor reaktiv quvvatini nazorat qilish va boshqarish uchun boshqariluvchan chiqish kuchlanishli tok o'zgartkichi-dan foydalanildi. Tok o'zgartkichining ishonchliligi, sezgirligi, o'lchash aniqlik va xatoliklarining dinamik tavsiflari Simulnik dasturidan foydalanilgan holda olindi. Tok o'zgartkichlari, asosan, asinxron motor elektr ta'minoti tizimining normal barqaror ish rejimi davrida ishlaydi. Bu rejimda ba'zi shartli chegaralar bilan tok o'zgartkichlarini tadqiq etishda kirish tokining minimal va maksimal qiymatlari qabul qilinadi, buning uchun aniqlik sinfi (0,1-1,2)Inom deb olinadi. Elektr jihozlar va tarmoqlardagi shikastlanishlar asinxron motor elektr ta'minoti tizimining halokatli ish rejimi-ga olib keladi. Bu holda tok o'zgartkichlari dinamik rejimda ishlaydi. Asinxron motorda qisqa tutashuv-lar elektromagnit tok o'zgartkichlarining dinamik re-jimlarda ishlashiga olib keluvchi asosiy sababdir. Elektromagnit tok o'zgartkichlarining bunday rejimda ishlashi boshqaruv tizimi sxemalaridagi ishlash shart-laridan sezilarli farq qiladi. Agar elektromagnit tok o'zgartkichlari o'lchov maqsadida ishlatilsa, odatda, nominaldan oshmagan birlamchi tokda ishlashi talab etiladi. Bunda asinxron motorning boshqaruv tizim-larida qo'llanuvchi elektromagnit tok o'zgartkichlari nominaldan ancha katta toklarda, o'tish rejimi sha-roitlarida, masalan, qisqa tutashuv va shikastlanish hollarida o'z funksiyalarini bajarishi shart.

Kalit so'zlar: asinxron motor, boshqariluvchan chiqish kuchlanishli tok o'zgartkichi, magnit maydon, ishchi tavsiflar, tok, kuchlanish, quvvat, tezlik va moment.

ДИНАМИЧЕСКИЕ ХАРАКТЕРИСТИКИ УПРАВЛЯЕМЫХ ПРЕОБРАЗОВАТЕЛЕЙ ВЫХОДНОГО НАПРЯЖЕНИЯ

Боиханов Заилобиддин Уразали угли,

докторант Андижанского машиностроительного института

ТЕХНИКА ФАНЛАРИ ТЕХНИЧЕСКИЕ НАУКИ TECHNICAL SCIENCES

Аннотация. В этой статье описывается управляемый преобразователь выходного напряжения в ток для контроля и управления реактивной мощностью асинхронного двигателя. Динамические характеристики преобразователя тока были получены с помощью программы Simulink с учетом надежности, чувствительности, точности измерения и погрешности. Преобразователи тока в основном эксплуатируются при нормальной устойчивой работе системы питания асинхронного двигателя. В этом режиме при исследовании преобразователей тока с некоторыми условными пределами принимаются минимальное и максимальное значения входного тока, для которых устанавливается класс точности (0,1-1,2)1ном. Повреждение электрооборудования и сетей может привести к аварийному режиму работы системы электроснабжения асинхронного двигателя, в этом случае преобразователи тока работают в динамическом режиме. Короткие замыкания в асинхронном двигателе являются основной причиной работы электромагнитных преобразователей тока в динамических режимах. Условия работы адаптеров электромагнитного тока в таких режимах существенно отличаются от условий работы в цепях системы управления. Если для целей измерения используются адаптеры электромагнитного тока, то обычно требуется, чтобы они работали при первичном токе, не превышающем номинальный ток, и выполняли свои функции в случае повреждения.

Ключевые слова: асинхронный двигатель, регулируемый выходной адаптер тока, магнитное поле, рабочие характеристики, ток, напряжение, мощность, скорость и момент.

DYNAMIC CHARACTERISTICS OF CONTROLLED OUTPUT VOLTAGE CONVERTERS

Boikhanov Zailobiddin Urazali ugli,

Doctoral Student of

Andijan Machine-Building Institute

Abstract. This article uses a controlled output voltage-to-current converter to control the reactive power of an induction motor. The dynamic characteristics of the current converter were obtained using the Simulink program, taking into account reliability, sensitivity, measurement accuracy and error. Current converters are mainly operated during normal stable operation of the power supply system of an asynchronous motor. In this mode, when studying current transducers with certain conditional limits, the minimum and maximum values of the input

nosimmetrik tokning tarkibiy qismlari paydo bo'lishi bilan murakkablashadi. Bu rotor va stator chulg'amlarida ortiqcha quvvat sarflanishiga olib keladi. Bu esa chulg'amlar qizib ketishi bilan bir qatorda ish muddati va qurilma ishlashining barqarorligiga ham sezilarli ta'sir qiladi. Uch fazali asinxron motorlardagi bunday ortiqcha sarfni qo'shimcha quvvat yo'qotish koeffitsienti yordamida hisoblash mumkin [2, 12-b.]:

Kr =

AP-nes _ 3I^R^+3I2 R2 _

31?

= 1 + k2

2 i

(3)

I.

Bu yerda k2j =— - teskari ketma-ketlikdagi I2

tok koeffitsienti; I, I - mos ravishda to'g'ri ketma-ketlikdagi toklar; R , R2 - mos ravishda to'g'ri ketma-ketlikdagi qarshiliklar; APnes -nosimmetrik tokdagi quvvat sarfi; ДPsjm -to'g'ri ketma-ketlik oqimlari tufayli quvvat yo'qotishlari.

Teskari kuchlanish ketma-ketligining nosimmetrik koeffitsientini quyidagicha yozishi mumkin:

„ _ U2 _ I2*Z2

Ay it — — — -

zu Ux I1*Z1

(4)

Bu yerda Z, Z2 - (3) ifodani mos ravishdagi to'g'ri va teskari ketma-ketliklarning to'la qarshiliklari ko'rinishida yozib olamiz.

(5) ifodada teskari ketma-ketlik oqimini ifodalaymiz:

K = 1 +ВД)2 J=J V—-1.

2 1 r

(5)

(6)

Keyin k2U koeffitsienti quyidagicha ko'rinadi.

Shundan k2U koeffitsientini quyidagicha yozib olamiz:

k2u —

_ Jkr-lZ2

(7)

(6) ifodadan quvvat sarfining koeffitsientini aniqlab olamiz:

Kr = l + (k2UZf)2. (8)

ТЕХНИКА ФАНЛАРИ ТЕХНИЧЕСКИЕ НАУКИ TECHNICAL SCIENCES

Uch fazali asinxron motor nosimmetrik kuchlanish ta'sirida quvvat iste'moli, statorda magnit (sochiluvchi) oqimlari sezilarli ravishda o'zgardi.

Material va metodlar

Uch fazali asinxron motor nosimmetrik kuchlanish sharoitida yuzaga keladigan jara-yonlarni ifodalash uchun ushbu jarayonlarning matematik modeli yaratildi. Matematik model simulnik kengaytmali matlab tizimi (Matrix Laboratory) orqali amalga oshirildi. Nosimmetrik kuchlanish sharoitida uch fazali asinxron motorning simulyatsiya modelida (1-rasm) A, B va D portlari asinxron motor stator chulg'amining kirish qismi hisoblanadi. Simulyatsiyada Tm porti qarshilik momentini hosil qilish uchun kerak bo'ladi.

current are accepted, for which the accuracy class (0.1-1.2)Inom is set. Damage to electrical equipment and networks can lead to emergency operation of the power supply system of an asynchronous motor, in which case the current converters operate in dynamic mode. Short circuits in an asynchronous motor are the main reason for the operation of electromagnetic current converters in dynamic modes. The operating conditions of electromagnetic current adapters in such modes differ significantly from the operating conditions in the control system circuits. If electromagnetic current adapters are used for measurement purposes, they are usually required to operate at a primary current not exceeding the rated current and must perform their functions in the event of a fault.

Keywords: induction motor, variable output current adapter, magnetic field, performance, current, voltage, power, speed and torque.

m-

A

=o—

Voltage Measurement! <з^01

КЗ

Voltage Measurement gg^j

с

-к let

в

в

Asynchronous Machine St Units

<SU№ torrent is_a (AJ>

<Sl»1pr ЯГГГ1 Ü_fe |A)>

«Stator cunert e_e (A)>

< Rotor speed (wm)>

Embedded MATLAB FundiOfl1

Embedded MATLAB Functioo2

► -

В

Em bead ей MATLAB Function^

«ElectrwufcjnMic iw$jt Те (N*m>>

g

В

Voltage Measurement^ о^оз

1-rasm. Uch fazali asinxron motorning nosimmetrik kuchlanish ta'sirida tokni kuchlanishga o'zgartirishning imitatsion modeli

Tadqiqot natijalari

Uch fazali asinxron motor stator chulg'amidagi tokni kuchlanishga o'zgar-tirish modeli to'rtinchi tartibli holat bilan ifodalanadi hamda ikkinchi tartibdagi di-namik xarakteristkalarni olish uchun me-

xanik qismi modellashtirilgan. Uch fazali asinxron motorning nominal parametrlarini quyidagicha ifodalay olamiz: nominal quvvat P = 0,75kW; nominal kuchlanish U = 380K;

n ' ' n '

tarmoq chastotasi f = 50Hz; nominal ay-lanishlar soni n= 1500 ay./daq.

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ТЕХНИКА ФАНЛАРИ ТЕХНИЧЕСКИЕ НАУКИ TECHNICAL SCIENCES

2-rasm. Simulyatsiya qilinadigan uch fazali asinxron motorning texnik parametrlari

Uch fazali asinxron motor reaktiv quvvatining nosimmetrik kattaliklarini boshqariluvchan chiqish kuchlanishli tok o'zgartkichining bir qator tajribalar orqali amalga oshirdik. Uch fazali asinxron motorning stator chulg'amida hosil bo'lgan nosimmetrik tokni kuchlanish ko'rinishidagi chiquvchi signal orqali, uch fazali asinxron

motor aylanishlar tezligining grafigi hamda elektromagnit momenti, stator chulg'amida hosil bo'lgan uch fazali nosimmetrik sinusoidal garmonika, chiquvchi kuchlanish ko'rinishidagi signalning ushbu jarayonlarga ustma-ust tusha olishini ifodalaydigan xarakteristikalar olindi [4, 5, 7, 9, 23-32-b., 6-b.].

¡Rotor speed [mn]>

■ / !

I ......ту......

...../......

E_ /

1 !

/

j ! i 1

0 005 ftl 015 01 025 0.3 035 0.1 045 0.5

2 s 1 A 1 I 1

J A

1 j \ч \____

.....у...... .....\ ...._ v\M/V ^лд/w шттш i i

i■ V- V- v Л/--v TV v V V 1

ok oí ais ог 0.25 аз аз5 а« 0.45 os 0

3-rasm. Uch fazali asinxron motor boshqariluvchan chiqish kuchlanishli tok o'zgartkichiga bo'ylama nosimmetrik kuchlanish ta'sir etganda, aylanishlar soni (n)

va moment (M) grafiklari

Uch fazali asinxron motor 0 - 0.3 s vaqt oralig'ida o'zining elektromagnit momentning garmonikasi (3-rasm)dan ko'rinadiki, 0,3 s vaqt o'tgandan keyin barqaror ish rejimiga tushadi. Uch fazaning bir fazasini 0 deb qabul qilsak, qolgan fazalardagi kuchlanish statorda

sochiluvchi magnit maydonni Fo hosil qiladi, lekin asinxron motorining ish parametrlari yomonlashadi hamda nosimmetrik rejimida burchak tezligi (w) oshishi natijasida o'sish taxminan 1% ni tashkil etdi, rotor validagi foydali quvvat P2 taxminan 5% ga kamaydi.

ТЕХНИКА ФАНЛАРИ ТЕХНИЧЕСКИЕ НАУКИ TECHNICAL SCIENCES

Simulnik qilinganda, uch fazali asinxron motorning nosimmetrik rejimdagi barcha faza

kuchlanishlarining vaqtga nisbatan grafigini tuzamiz (4-rasm).

4-rasm. Uch fazali asinxron motorning bo'ylama nosimmetrik kuchlanish ta'sirida hosil

qilingan EYUKlar garmonika grafiklari

Uch fazali asinxron motorga nosimmetrik o'tayotgan nosimmetrik toklar garmonikalari kuchlanish ta'siridan stator chulg'amidan o'zgarishini matlab dasturida ko'ramiz.

5-rasm. Uch fazali asinxron motorga tarmoqdan nosimmetrik kuchlanish berilganda, stator chulg'amidan o'tayotgan tokning vaqtga bog'liq grafigi

Uch fazali asinxron motorga bo'ylama nosimmetrik kuchlanish ta'sir etganda, ishga tushirish 0-0.05 s oralig'ida sodir bo'lyapti. 0-0.3 s oralig'ida motor o'zining turg'un holatiga erishayotganini ko'rish mumkin. 0.3 s dan keyingi a fazada tok kuchi qiymati kamayotgani kuzatiladi.

Bunda iste'mol qilinayotgan reaktiv quvvat qiymati stator paziga aniqlik bilan joylashtirilgandan so'ng tokni kuchlanish ko'rinishidagi signalga o'zgartirish o'zgart-kichi yordamida nazorat qilib boshqarish imkoniyatiga erishish mumkin [13, 14, 17, 12-19-b.].

ТЕХНИКА ФАНЛАРИ ТЕХНИЧЕСКИЕ НАУКИ TECHNICAL SCIENCES

6-rasm. Stator chulg'amiga berilgan nosimmetrik kuchlanishni tokni kuchlanishga o'zgartirish o'zgartkichidan chiquvchi signal orqali tavsiflovchi grafig

Xulosalar

Tarmoqdan kelayotgan nosimmetrik kuchlanish statorda magnit maydoni hosil qiladi. Agar L1 fazada kuchlanish yo'q bo'lib qolsa, sezuvchi element L1 da kuchlanish yo'qligi haqida xabardor bo'ladi. Matlab

dasturida uch fazali asinxron motorni modellashtirish natijasida nosimmetrik kuchlanish ta'siri ish sharoitlarini tahlil qilish, nosimmetriklik darajasini aniq ifodalash va uni nazorat qilish imkonini beradi.

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ТЕХНИКА ФАНЛАРИ ТЕХНИЧЕСКИЕ НАУКИ TECHNICAL SCIENCES

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Sadullayev N.N., t.f.d., prof., "Energetika" fakulteti dekani, Buxoro muhandislik-texnologiya instituti.

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