scholarly journals Investigation of the Emission Higher Harmonics into the Generator Grid

2021 ◽  
Vol 2096 (1) ◽  
pp. 012158
Author(s):  
V V Yaroshevich ◽  
A S Karpov ◽  
G P Fastiy
Keyword(s):  
Power Plants ◽  
Industrial Enterprise ◽  
Hydroelectric Power ◽  
Double Frequency ◽  
Linear Load ◽  
Generator Voltage ◽  
Bridge Rectifier ◽  
Tangential Forces ◽  
Non Linear Load ◽  
Aluminium Plant

Abstract The article considers a section of the grid with generator voltage busbars (GRU-10 kV) of one of the hydroelectric power plants HPP-I of a large cascade HPP, which supplies electricity to an aluminium plant via two busbars. It is described that the plant load includes converter units, including: transformers, bridge rectifier blocks and saturation chokes, which are powerful sources of harmonic disturbances. An overview of the developed model and the principles of its construction for studying the influence a powerful non-linear load on the generator is given. Analysis of the results calculations on the model showed that the load of an industrial enterprise creates current and voltage distortions in the electrical s not only of the plant itself, but also in urban grids, and on the busbars of the generator voltage HPP-I. The article analyzes the influence of the current effects of a large industrial enterprise load in asymmetric modes on hydrogenerators by evaluating torsional vibrations and tangential vibrations in generators. It is shown that tangential forces of double frequency (100 Hz) practically do not create significant vibration displacements when the natural frequency of the frontal parts basket is adjusted.

scholarly journals Analytical Approach to Sampling Estimation of Underwater Tunnels Using Mechanical Profiling Sonars

Sensors ◽  
2021 ◽  
Vol 21 (5) ◽  
pp. 1900
Author(s):  
Vitor Augusto Machado Jorge ◽  
Pedro Daniel de Cerqueira Gava ◽  
Juan Ramon Belchior de França Silva ◽  
Thais Mancilha ◽  
Waldir Vieira ◽  
...  
Keyword(s):  
Power Plant ◽  
Power Plants ◽  
Hydroelectric Power ◽  
Large Power ◽  
Unmanned Underwater Vehicles ◽  
Power House ◽  
Simulated Environment ◽  
Sonar Sensor ◽  
Power Plant Operation ◽  
Plant Power

Hydroelectric power plants often make use of tunnels to redirect the flow of water to the plant power house. Such tunnels are often flooded and can span considerable distances. Periodical inspections of such tunnels are highly desirable since a tunnel collapse will be catastrophic, disrupting the power plant operation. In many cases, the use of Unmanned Underwater Vehicles (UUVs) equipped with mechanical profiling sonars is a suitable and affordable way to gather data to generate 3D mapping of flooded tunnels. In this paper, we study the resolution of 3D tunnel maps generated by one or more mechanical profiling sonars working in tandem, considering synchronization and occlusion problems. The article derives the analytical equations to estimate the sampling of the underwater tunnels using mechanical profiling sonars (scanning sonars). Experiments in a simulated environment using up to four sensors simultaneously are presented. We also report experimental results obtained by a UUV inside a large power plant tunnel, together with a first map of this environment using a single sonar sensor.

Water quality impacts of small hydroelectric power plants in a tributary to the Pantanal floodplain, Brazil

2021 ◽  
Author(s):  
Rúbia Fantin Cruz ◽  
Stephen K. Hamilton ◽  
Hans M. Tritico ◽  
Ibraim Fantin‐Cruz ◽  
Daniela Maimoni Figueiredo ◽  
...  
Keyword(s):  
Water Quality ◽  
Power Plants ◽  
Hydroelectric Power ◽  
Hydroelectric Power Plants

Application of Intelligent Technological Systems in Order to Increase Efficiency of the Lock Chamber System in Hydro Power Plants

2015 ◽  
Vol 806 ◽  
pp. 64-73
Author(s):  
Aleksandar Vujović ◽  
Zdravko Krivokapić ◽  
Jelena Jovanović
Keyword(s):  
Power Plants ◽  
Hydroelectric Power Plant ◽  
Global Market ◽  
Real System ◽  
Hydroelectric Power ◽  
Initial State ◽  
Hydro Power ◽  
Lock Chamber ◽  
Levels Of Automation ◽  
Hydro Power Plants

The paper is a result of research at the Mechanical Engineering Faculty in Podgorica and represents the aspiration of authors to combine scientific and technical experience in order to achieve improvement in a real system. It is a complex system of lock chambers in a hydroelectric power plant. Based on a detailed analysis of the initial state, through the process modeling of complex real system, the authors identify possible areas where the intervening and applying modern systems with greater flexibility is necessary to achieve higher levels of automation. Also, proposed in the paper are measures for ensuring the security of information that rise system performance to a higher level compared to the competition and create an advantage in the global market.

Exploration of EMI in Buck Boost Converter – A Real Time Approach 

2014 ◽  
Vol 573 ◽  
pp. 78-82
Author(s):  
Gopal Janaki ◽  
A. Senthil Kumar
Keyword(s):  
Closed Loop ◽  
Load Condition ◽  
Boost Converter ◽  
Experimental Result ◽  
Loop Control ◽  
Class A ◽  
Linear Load ◽  
Constant Output ◽  
Non Linear Load ◽  
Conducted Emi

This paper explores the level of conducted EMI in a buck boost converter under a non linear load condition based on the CISPR 11 / Class A EMC standard. Here, the buck boost converter was designed to produce a constant output voltage irrespective of load conditions. The closed loop control is designed using dsPIC controller. Three different randomization firing schemes are adopted and the EMI analysis in each mode is done experimentally. Also, the results are compared with normal PWM scheme. The experimental result shows that in RPWM scheme the emission levels are comparatively low.

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