All sciences. №7, 2022. International Scientific Journal

– on the receiving side 8 of the fiber-optic communication line 7:

1) the received optical radiation is output through the output 9—2 of the directional coupler 9 from the fiber-optic communication line 7,

2) a total signal is generated from the received optical radiation using a photodetector 10,

3) mixer 11 by shifting the delayed inverse noise signal to the total signal, an information signal is isolated

When using the proposed method of protecting an information signal from unauthorized access in a fiber-optic communication line, in which a noise signal is generated on the receiving side before the total signal is formed, which is transmitted to the transmitting side of the fiber-optic communication line for mixing to the information signal.

On the receiving side, in the process of shifting to the total signal, the delayed inverse noise signal occurs with a complete phase coincidence of the noise and its inverse signal. As a result, the noise signal is fully compensated, the information signal is allocated and the information in the fiber-optic communication line is protected from unauthorized access.

Fig. 1. Block diagram of the device

A method of protecting an information signal from unauthorized access in a fiber-optic communication line, consisting in the fact that an information signal is formed on the transmitting side of a fiber-optic communication line, a total signal is formed by mixing a noise and information signal, formed by modulating the total signal of the optical radiation to be transmitted and introduced into a fiber-optic communication line, and on the receiving side of the fiber-optic communication line, the received optical radiation is output from it, from the received optical radiation, a total signal is formed from which an information signal is isolated, characterized in that before the formation of the total signal, an initial and inverse noise signal is formed on the receiving side, modulated with the initial noise signal of optical radiation and injected into the fiber-optic communication line, and the received optical radiation is output from it on the transmitting side of the fiber-optic communication line, a noise signal is formed from the received optical radiation, which is subject to the displacement of the information signal, and the allocation of the information signal on the receiving side is made by mixing the delayed inverse noise signal to the total signal, and the delay time of the inverse noise signal is determined by the expression, where: L is the length of the optical fiber; v is the speed of optical radiation in the optical fiber.

Literature

1. Korolkov, I. A. Kraschenko, V. G. Matyukhin, S. G. Sinev. Problems of protecting information transmitted over fiber-optic communication lines from unauthorized access/ Information Society, 1997, issue 1, pp. 74—77

2. A. V. Boos, O. N. Shukhardin. Analysis of the problems of ensuring the security of information transmitted via optical communication channels and ways to solve them.//Informational counteraction to the threats of terrorism: scientific and practical. Journal. /FSUE STC, Moscow. 2005, No. 5. p. 172180.

3. K.E.Rumyantsev, I.E. Khayrov. Protection of information transmitted via LED communication lines..//Information counteraction to terrorism threats: scientific and practical. Journal. /FSUE STC, Moscow. 2004, No. 2. pp. 27 – 32.

COMPUTER MODEL OF MICRO-HYDROELECTRIC POWER STATION USING THE POTENTIAL ENERGY OF GEOTHERMAL WATERS

UDC 004.94

Kuldashov Obbozjon Xokimovich

Doctor of Technical Sciences, Professor of the Scientific Research Institute “Physics of Semiconductors and Microelectronics” at the National University of Uzbekistan

Dadazhonov Tulanboy

Senior Lecturer of the Department of Electronics and Instrumentation of the Fergana Polytechnic Institute

Fergana Polytechnic Institute

Annotation. A model of joint operation of a micro – hydroelectric power plant and a geothermal water facility has been developed, taking into account their main technical and technological characteristics in a wide range of operating conditions, including rotor rotation speeds, generator excitation voltage, generator phase currents and output voltages in general.

Keywords: micro – hydroelectric power plant, model, HydraulicTurbine and Governor (HTG) unit, rotor rotations, generator excitation voltage, generator phase currents and output voltages.

Аннотация. Разработана модель совместной работы микро – ГЭС и объекта геотермальной воды, с учётом их основных технико-технологических характеристик в широком диапазоне эксплуатационных условий, в том числе скорости вращения ротора, напряжение возбуждения генератора, фазные токи генератора и выходные напряжения в целом.

Ключевые слова: микро – ГЭС, модель, блок HydraulicTurbine and Governor (HTG), вращения ротора, напряжение возбуждения генератора, фазные токи генератора и выходные напряжения.

The microelectric power plant model consisting of a hydraulic turbine and a synchronous generator is shown in Fig.1. The Hydraulic Turbine and Governor (HTG) unit is a model of a hydraulic turbine with a control system. The control system includes a proportional differential (PID) controller and a control servo motor [1]. The general scheme of the model is shown in Fig. 2.

Fig.1. microGES model

Fig. 2. Model of the control system

The required values of angular rotation speed (wref) and power (Pref) are fed to the first two inputs of the unit. The third and fourth inputs of the unit receive the actual values of the angular rotation speed (we) and active power (Pe). The fifth input is supplied with the deviation of the angular rotation frequency of the synchronous generator rotor (dw). The output signals are the mechanical power that must be supplied to the corresponding input of the synchronous machine unit (Rm), and the value of the hydraulic turbine gate opening (gate). Inputs 2 and 4 may remain unconnected if a signal about the shutter position is used as feedback, and not a speed deviation. Ice input and output values are measured in relative units.

The hydraulic turbine itself is modeled by a nonlinear system shown in Fig. 3.

Fig. 3. Hydraulic turbine model

The servomotor controlling the turbine gate is modeled by a second-order system (Fig.4).

Fig. 4. Servomotor model

The window for setting parameters of the Hydraulic Turbine and Governor (HTG) block is shown in Fig.5.

Fig.5. Window for setting parameters of the Hydraulic Turbine and Governor block

Unit parameters (HTG) :