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7CENTRAL ASIAN ACADEMIC JOURNAL ISSN: 2181-2489
OF SCIENTIFIC RESEARCH VOLUME 2 I ISSUE 5 I 2022
Scientific Journal Impact Factor (SJIF 2022=4.63) Passport: http://sjifactor.com/passport.php?id=2223Q
SYMMETRICAL MODE OF SYNCHRONOUS GENERATOR USED IN MICROGIDROELECTRIC POWER STATION
N. B. Pirmatov O. B. Parpiyev V. H. Karimov
Tashkent State Technical Andijan Machine-Building Tashkent State Technical University Institute University
ABSTRACT
Water for irrigation of agricultural crops is supplied through water facilities of different sizes. Effective use of the mechanical energy of the water in the garden of irrigation in this way allows to reduce the energy shortage in the Republic and prevent dependence on energy. In achieving such a result, it is desirable to use synchronous generators in Microges.
Keyswords: gidromechanics, gidromashinasozlik, channel, synchronous generator, symmetrical mode.
The development of gidroenergetics all over the world has a great impact on the development of strong energy gidromashinasosis in most countries. As a result, the capacity of the gidroagregates in each of the HPS under construction increased. For example, in Russia - the capacity of each hydroelectric power plant of the Volgograd HPP is 115 MW, in Bratsk - 250 MW, in Krasnoyarsk-500 MW, in Sayan - Shushensk - 640 MW, out of the gidroinshoots built in Central Asia, the Chirchik cascade - 899 MW, camel - 150 MW, built in the Sirdarya Farhod - 126 MW, Shahrichon - 28,7 MW, Birch-126 MW.
Today, the world's gidromechanics engineers and scientists have studied pumps, volumetric gidroosatms and hydrodynamic transmission machines with high productivity and pressure in gidromashinasozlik and achieved great success in their creation. For example, only water reservoirs in the main channel of the Great Mirzachul in Uzbekistan, Jizzakh pumping station, cattle, Zombies, Jizzakh, Gallaorol, camel furs can be an example of this [1].
Therefore, water for irrigation of agricultural crops is supplied through channels of different sizes, ditches, lotocks. Effective use of the mechanical energy of the water in the garden of irrigation in this way allows to reduce the energy shortage in the Republic and prevent dependence on energy.
Taking into account the above points, it is desirable to maintain the capacities produced by large-capacity HPS and HPS, and to introduce small HPS widely, without harming Environmental Protection.
CENTRAL ASIAN ACADEMIC JOURNAL ISSN: 2181-2489
OF SCIENTIFIC RESEARCH VOLUME 2 I ISSUE 5 I 2022|
Scientific Journal Impact Factor (SJIF 2022=4.63) Passport: http://sjifactor.com/passport.php?id=2223Q
When building small hydroelectric power plants, it will be necessary to use synchronous generators that are efficient, which convert the mechanical energy of water into electricity.
Bunda, sinxron generatorlarning nosimmetrik barqarorlashgan ish rejimlarini o'rganish talab etiladi.
The work of the synchronous generator in symmetrical loading.
Synchronous generator single-phase loads in addition to the symmetrical load on the electrical network, which provides energy (for example, electric lights, electric current running on a single-phase current transporti, electric furnaces and welding transformers with electric arc, etc.) when either connected or in single - phase and two-phase short-circuit (1, b,d-figure) modes, the irregularity of Phase currents occurs, the wiper angle between the phase currents of the bunda will not be equal to the electric angle of 120°.
1-picture. Three-phase synchronous generator loading symmetrical (ZA ^ ZB^ZC) (a) hol uchun hamda bir (b), ikki (d) va neytralga tushgan ikki fazali (e) qisqa tutashuv
sxemalari.
For the analysis of such a symmetrical mode, the symmetrical organizers method is used, as is the analysis of the symmetrical system in three-phase transformers. Bunda IA, IB, IC - three - phase symmetrical buckles divide the system into a system of straight I1, reverse I2 and zero I0 series symmetrical buckles.
The correct sequence of the currents system is IA1, IB1, IC1, which in a three-phase synchronous machine creates a yakor MYK, which rotates at the same frequency as the rotor. This is incurable compared to the MYK rotor chips. The inductive resistance of yakor's chalk for straight series buckles is equal to xd and xq.
The effect of reverse sequence currents on synchronous generator operation.
The reverse sequence of the system of currents IA2, IB2, IC2 forms the yakor MYK, which is turned to the opposite side in the direction of rotation of the rotor. This means that the magnetic field generated by the reverse sequence of currents is induced in the rotor and the calming (dempfer) crosses the chulgas and creates EYuK in them (hence the currents too). This is the power of the electrician and the frequency of the current (Figure 1, B) is greater than that of the yakor chulgamnik 2 marotaba.
CENTRAL ASIAN ACADEMIC JOURNAL OF SCIENTIFIC RESEARCH
ISSN: 2181-2489 VOLUME 2 I ISSUE 5 I 2022
Scientific Journal Impact Factor (SJIF 2022=4.63) Passport: http://sjifactor.com/passport.php?id=2223Q
Turbogenerators to the inverted circulating area formed by the reverse series of currents are extremely sensitive, since their rotor is massive (bulk, that is, holistic), the waste in them is large, and excessive heating of the rotor is dangerous, the machine'S fig is also reduced. For this reason, it is necessary to reduce the turbogenerator power relative to the symmetrical load.
Alternating current, which is formed in the excitation cell,the frequency of which is increased by 2 marotaba, affects the unchanged current of the same cell (that is, by adding) 2, forming a alternating current as in the figure.
2-picture. Starting at the symmetrical load of the synchronous generator the change shape of the cholgami current (a) and the reverse in the turbogenerator rotor the scheme of paths through which the currents formed the area of the sequence (b) [2] As a result of interaction of the starting area with the area of the stator with the area of the reverse sequence, as well as with the area of the rotor current, where the correct sequence area and frequency of the stator exceeds the area of the rotor current by 2 marotaba, tangential forces appear in the machine due to pulsating moments with.
Since the frequency of EYuK and current in the Rotor blades is 2 marotaba greater than that of the yakor worm, it is recommended to use extreme transient (or transient) inductive resistance when calculating reverse sequence buckles. In other words, short-circuit calming (dempfer) chulgami for reverse sequential flows will function just like the effect of short-circuit rotor chulgam on stator circulating magnetic flow in asynchronous machines.
In the Noayon pole synchronous generator, the reverse sequence field is induced in the massive rotor, with the reflected effect of the uyurma Current, its effect is much more sluggish.
In an open pole synchronous generator, the reverse sequence current forms the electric driving force (i.e. also the currents) in the dempfer Chuck, which, in turn,
a)
b)
CENTRAL ASIAN ACADEMIC JOURNAL ISSN: 2181-2489
OF SCIENTIFIC RESEARCH VOLUME 2 I ISSUE 5 I 2022
Scientific Journal Impact Factor (SJIF 2022=4.63) Passport: http://sjifactor.com/passport.php?id=2223Q
according to the Lens Rule, has a magnetizing effect on this current, and the machine's reverse sequence resultant current decreases.
The reverse sequence flow crosses the goh longitudinal and goho transverse axes of the rotor. For this reason, the average value of the inductive resistance of the machine for inverted series buckles can be obtained as follows:
x 2 = 0, 5 (x¿' + x¿') , (1.1)
if the dempferentum cholgami is located along the yakor circle, then x 2 « x'i « xJ'. (1.2)
In order to obtain the reverse sequence inductive resistance x2, in the experiment, it is necessary to connect the synchronous machine stator choline to the alternating current network, turning its rotor into the rotation of the field with a synchronous frequency to the opposite side (voltmeter connected to the starting choline shows a large voltage). The inductive resistance of the reverse sequence in the open-pole synchronous generators supplied with Dempfer Chuck is x2=0,15^0,35, while in turbogenerators the dempfer Chuck functions as a rotor mass and in them x2=0,12^0,25.
References
1. Nurmatov J., Ubaydullayev S., Rustamov R., O'rozov B., Yusupov M. Idravlika. - T.: "Ilm ziyo", - 2013.
2. Salimov J.S., Pirmatov N.B. Electric machines. -T.: O'zbekiston faylasuflari milliy jamiyati nashriyoti. 2011. - 408 b.
