The paper provides information on use of direct current (DC) energy in the electric power supply industry of agriculture and water management, hydraulic engineering construction, metallurgy, irrigation and melioration. The need for non-contact non-destructive control of high amperage DCs of high-capacity electrical installations in irrigation and melioration, hydraulic engineering has been identified. The basic requirements for non-contact transducers and sensors of high amperage DC measurements without circuit breaking are formulated. Identified priority directions in the development of above mentioned transducers. The general construction principles of non-contact ferromagnetic transducers of high amperage DCs and the results of the development of one of the modification of the developed wide-range magneto modulation contactless transducers of high amperage DCs and a device based on it are given. It is shown that the developed transducer and device, as distinct from the known ones, have increased accuracy and sensitivity, technological design and small weight and dimensions with low material consumption and cost. The error estimation of the developed magneto modulation non-contact wide-range device for non-destructive control of high amperage currents is carried out and it’s RMS (root-mean-square) and entropy errors are estimated. It can be widely used in power systems in irrigation and melioration, in water supply system, industry, railway transport, science, technology and for testing power meters at their installation site for contactless control of DC and also ACs (alternative currents).
Recently due to the worldwide population grows much attention has been paid to increasing total electricity generation. However, traditional power plants, which are used hydrocarbon fuels, cause one of the challenging problems like environmental contamination and global warming in the world. In this case, renewable or alternative energy sources can be a promising replacement for traditional hydrocarbon fuels. Uzbekistan has lots of small rivers and water reservoirs and the use of these potentials in the perspective to generate power it is a unique decision of the problem. Usually in small power plants use low-speed generators and efficiency of these type generators are very low. Hence, the main objective of this study is to increase the efficiency of the low power generator by improving and optimizing the specifications and parameters of the low power generators. The use of low-speed generators with permanent magnet excitation for micro-hydroelectric power plants and wind turbines is relevant in terms of providing good weight and size indicators, simplicity of construction, lack of sliding contacts, with the ability to perform a generator of low rotation speeds, which causes low cost and high reliability. In this study, the natures of the influence of the main geometric dimensions of the mass-dimensional parameters and the air gap on the energy indicators of the generator are estimated. Theoretical and experimental research results are submitted.
In article are brought frequency regulation of the asynchronous electric motor and that reach to energy saving itself. Frequency management is energy saving so regulation of the frequency of the rotation of the asynchronous engine are provided increasing coefficient of efficiency and reduction of the loss to powers. A machine asynchronous is often used today as a power scale ranging with a motor from some Watts to several thousand kW. For power applications exceeding several kW, asynchronous motors run solely on three-phase AC power supplies. Owing to the sensitivity of a process or the critical nature of certain applications, the network may be supported with an Uninterruptible Power Supply.
Nowadays, water and energy resources are becoming scarcer due to the inefficient use of these vital resources in agricultural irrigation worldwide. The unique solution to this problem is the application of smart technology in water distribution systems. But the most pivot weir installations in water distribution systems have not access to power and have a remote location from the power line. This problem requires developing a low-power smart system for water level and flow measurement and control in open canals. In this study, the authors attempt to detect the advantages and disadvantages of existing methods and hardware, the most important influencing factors of the system for energy efficiency, and develop a more energy-efficient and precise smart system for water flow and level measurement and controls in open canals. The question of the development of a low power smart system for water flow and level measurement and control in open canals in terms of energy efficiency is considered as well. Theoretical and experimental research results are submitted.
This paper discusses the question of modeling and simulation of water levels control in open canals as a key decition of water and energy resources scarsity in the vegetation period of agricultural irrigation. The mathematical model of the water levels control in open canals is developed and the outcomes are evaluated using by Matlab’s tool Simulink. In addition, the paper proposes that the pivot weir or overshot gate for water levels control in open canals is simple in terms of precise and quality control of the upstream and downstream water levels control. Then dynamic equation of control object that describes dynamic state of the water levels control was obtained. A functional diagram has been developed and PID control was applied for the water levels control in the open canals. PID control was applied for the water levels control in the open canals to know how faster response the object to disturbance. Based on functional diagram the model of the system was built in Simulink environment and obtained the dynamic response.
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