The AC-DC-AC Converter Design for Parallel Asynchronous Generator Based Microhydro Power Plants

2021 ◽  
Author(s):  
Arief Marwanto ◽  
Rudi Irmawanto ◽  
Muhamad Haddin ◽  
Marwan Rosyadi
Keyword(s):  
Power Plants ◽  
Asynchronous Generator ◽  
Converter Design

scholarly journals MODELING OF COMPATIBLE WORK OF DISTRIBUTED POWER SOURCES OF ELECTRIC POWER AND CENTRALISED POWER SUPPLY

2018 ◽  
pp. 189-195
Author(s):  
Petro Lezhnyuk ◽  
Iryna Hunko ◽  
Juliya Malogulko ◽  
Iryna Kotylko ◽  
Lіudmyla Krot
Keyword(s):  
Power Supply ◽  
Power Plants ◽  
Solar Power ◽  
Energy Sources ◽  
Hydroelectric Power Station ◽  
Hydroelectric Power ◽  
Distributed Energy ◽  
Power Stations ◽  
Asynchronous Generator ◽  
Solar Power Plants

Urgency of the research. Current trends of distributed generation development in Ukraine indicate a rapid generation in-crease from renewable energy plants. Most developed countries gradually refuse from the fossil fuels use and invest more and more to the “green” energy. Therefore, there is a need for a detailed study of the operation conditions of distributed energy sources due to their instability, as well as the processes that arise in distribution electric networks with diverse types of distributed energy sources. Target setting. In the producing process of power energy by distributed energy sources due to the increase in their num-ber, there are situations where several renewable sources of energy operate to only one system of buses. Thus, such distributive networks acquire the features of a local power system, which complicates the control process of such systems, and also there is a problem with the electricity supply of consumers. Actual scientific researches and issues analysis. The analysis of publications suggests that in literature more attention is paid to studying the operating modes of solar power plants, or small hydroelectric power plants. However, almost no attention was paid to the study of their cooperation work. Uninvestigated parts of general matters defining. Only a few works are devoted to the study of the cooperation of the diverce sources of distributed energy sources in the local electrical systems. That is why, their impact on power distribution networks and on the grid in general has not been studied extensively. The research objective. In this article was considered the influence of asynchronous generators on small hydroelectric power plants on the operation modes of distribution electrical networks, and were investigated the processes that are occurring in local power systems with different types of distributed energy sources. The statement of basic materials. Based on the research results, was developed a computer model of a such system in the PS CAD software environment. Two solar stations and one small hydroelectric power station with an asynchronous generator were connected to the power supply. It was shown the simulation of two modes of operation: a joint operation of a small hydroelectric power station, two solar power stations and a power supply center; a joint operation of a small hydroelectric pow-er plant, two solar power stations and a power supply disconnected. Conclusions. As a result of computer simulation, it is shown that by switching on a small hydroelectric power plant with an asynchronous generator in the case of an emergency shutdown of centralized power supply, it is possible to restore the work of solar power plants, and thus partially or completely restore the power supply of consumers.

scholarly journals The main types of wind turbines-generators in the power supply system

2022 ◽  
Vol 23 (5) ◽  
pp. 24-33
Author(s):  
S. K. Sheryazov ◽  
S. S. Issenov ◽  
R. M. Iskakov ◽  
A. B. Kaidar
Keyword(s):  
Wind Energy ◽  
Wind Power ◽  
Wind Turbines ◽  
Smart Grids ◽  
Power Plants ◽  
Power Conversion ◽  
Power Converter ◽  
Wind Energy Conversion ◽  
Wind Power Plants ◽  
Asynchronous Generator

PURPOSE. Conduct a detailed analysis of existing wind turbines. Analyze the role, place and features of the functioning of wind power plants. Provide various options for generators and schemes for converting wind energy into electricity. Provide recommendations for improving the reliability of wind turbines in smart grids.METHODS. The article was prepared using analytical methods, statistical, theoretical, factorial and technical methods.RESULTS. A fixed speed asynchronous generator used in a wind power conversion system (WECS) without a power converter interface draws a significant portion of the reactive power from the grid. This configuration features simple, reliable operation. Wind turbine asynchronous generator with dual power supply. can improve overall power conversion efficiency by performing maximum power point tracking (MPPT), and an increase in speed of about 30% can improve dynamic performance and increase resilience to system disturbances that are not available for turbine types 1 and 2. The use of full-scale 100% power converters will significantly increase the productivity of SPEV wind energy conversion systems, but will slightly increase the cost of the power converter, up to 7% - 12% of the total equipment cost. By using a large number of pole pairs for all types of permanent magnet synchronous generator (PMG), the turbine gearbox can be removed. This type of wind energy conversion system is more resilient to grid disruptions compared to type 1, 2 and 3 wind systems. The review shows that types 3 and 4 technologies are used to most efficiently sell and recycle wind turbines in electricity markets.CONCLUSION. The article analyzes the features of the functioning of wind power plants operating on the grid. Various options for generators and schemes for converting wind energy into electricity are presented. A detailed analysis of existing wind turbines is provided. Recommendations are given for improving the reliability and efficiency of wind power plants in smart grids.

Research of DSP-Based Automatic Quasi-Synchronization Device

2014 ◽  
Vol 926-930 ◽  
pp. 466-469
Author(s):  
Li Ge ◽  
Wen Hong Liu ◽  
Chun Yan Wang
Keyword(s):  
Power Plants ◽  
Energy Savings ◽  
Technology Development ◽  
Development Path ◽  
The Disabled ◽  
Asynchronous Generator ◽  
Phase Out ◽  
Automatic Synchronization ◽  
Advanced Computer ◽  
Manual Mode

Automatic quasi-synchronization device is an important device for power plants, which directly affect the safety and life of the generator as well as energy savings. Adverse devices and network with the same period a manual generator are killers and it has an affect the operation of the power system. There are still a large number of power plants and networks using manual mode, although most plants have automatic synchronizing device, but most are in the disabled state. Technology development path suited to phase out production which is old and bad and replace them with the more advanced new products. Therefore, the development of advanced computer automatic synchronizing device can greatly prevent the occurrence of the closing asynchronous generator. This paper introduces the development status automatic synchronizing device, discusses the hardware design of DSP-based automatic synchronizing device and automatic synchronization process simulation.

scholarly journals The problems of using Autonomous power plants based on induction machines with short-circuit rotor

2016 ◽  
Vol 12 (3) ◽  
pp. 97-103
Author(s):  
Alexander G Scherbakov ◽  
Olga V Arkhipova
Keyword(s):  
Mathematical Model ◽  
Power Supply ◽  
Power Plants ◽  
Power Supply System ◽  
Short Circuit ◽  
Induction Machines ◽  
Supply System ◽  
Software Product ◽  
Asynchronous Generator ◽  
The Mathematical Model

This article describes the mathematical model of the Autonomous power supply system based on asynchronous generator and the description of a software product that implements the proposed mathematical model.

scholarly journals Области применения и возможность использования асинхронных генераторов в автономных ветроэнергетических установках

2021 ◽  
Vol 70 (2) ◽  
pp. 93-96
Author(s):  
А.Н. Соболь ◽  
А.А. Андреева
Keyword(s):  
Wind Power ◽  
Wind Turbines ◽  
Power Plants ◽  
Excitation Frequency ◽  
Lower Power ◽  
Wind Power Plants ◽  
Semiconductor Converter ◽  
Asynchronous Generator ◽  
Frequency Character ◽  
Dual Power

Autonomous asynchronous generators can be classified depending on how the excitation frequency character, a method of stabilizing a voltage, type and number of phases. The issue of using autonomous asynchronous generators with capacitive excitation in wind power plants is quite relevant. Advantages of wind turbines based on a dual power asynchronous generator: the use of a semiconductor converter of lower power, which can significantly reduce its cost

Use of fractals to describe microstructures of porous thick-film platinum electrodes

1992 ◽  
Vol 50 (1) ◽  
pp. 314-315
Author(s):  
Steven D. Toteda
Keyword(s):  
Fractal Dimension ◽  
Power Plants ◽  
Electrical Response ◽  
Cubic Phase ◽  
Platinum Electrodes ◽  
Fine Grained ◽  
Impedance Response ◽  
Platinum Particles ◽  
Energy Surfaces ◽  
Highly Porous

Zirconia oxygen sensors, in such applications as power plants and automobiles, generally utilize platinum electrodes for the catalytic reaction of dissociating O2 at the surface. The microstructure of the platinum electrode defines the resulting electrical response. The electrode must be porous enough to allow the oxygen to reach the zirconia surface while still remaining electrically continuous. At low sintering temperatures, the platinum is highly porous and fine grained. The platinum particles sinter together as the firing temperatures are increased. As the sintering temperatures are raised even further, the surface of the platinum begins to facet with lower energy surfaces. These microstructural changes can be seen in Figures 1 and 2, but the goal of the work is to characterize the microstructure by its fractal dimension and then relate the fractal dimension to the electrical response. The sensors were fabricated from zirconia powder stabilized in the cubic phase with 8 mol% percent yttria. Each substrate was sintered for 14 hours at 1200°C. The resulting zirconia pellets, 13mm in diameter and 2mm in thickness, were roughly 97 to 98 percent of theoretical density. The Engelhard #6082 platinum paste was applied to the zirconia disks after they were mechanically polished ( diamond). The electrodes were then sintered at temperatures ranging from 600°C to 1000°C. Each sensor was tested to determine the impedance response from 1Hz to 5,000Hz. These frequencies correspond to the electrode at the test temperature of 600°C.

The Effects of Ion Implantation on the Surface Features of Inconel 600

1985 ◽  
Vol 43 ◽  
pp. 288-289
Author(s):  
John D. Rubio
Keyword(s):  
Grain Boundary ◽  
Ion Implantation ◽  
Nuclear Power ◽  
Power Plants ◽  
Surface Region ◽  
Selective Dissolution ◽  
Boundary Region ◽  
Near Surface ◽  
Inconel 600 ◽  
Steam Generator Tubing

The degradation of steam generator tubing at nuclear power plants has become an important problem for the electric utilities generating nuclear power. The material used for the tubing, Inconel 600, has been found to be succeptible to intergranular attack (IGA). IGA is the selective dissolution of material along its grain boundaries. The author believes that the sensitivity of Inconel 600 to IGA can be minimized by homogenizing the near-surface region using ion implantation. The collisions between the implanted ions and the atoms in the grain boundary region would displace the atoms and thus effectively smear the grain boundary.To determine the validity of this hypothesis, an Inconel 600 sample was implanted with 100kV N2+ ions to a dose of 1x1016 ions/cm2 and electrolytically etched in a 5% Nital solution at 5V for 20 seconds. The etched sample was then examined using a JEOL JSM25S scanning electron microscope.

Work structure in nuclear power plants

1983 ◽  
Author(s):  
Marjorie B. Bauman ◽  
Richard F. Pain ◽  
Harold P. Van Cott ◽  
Margery K. Davidson
Keyword(s):  
Nuclear Power ◽  
Power Plants ◽  
Nuclear Power Plants ◽  
Work Structure
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