scholarly journals Choosing variable-frequency drive systems for the mining process units

2021 ◽  
Vol 244 ◽  
pp. 09011
Author(s):  
Natalia Kugusheva ◽  
Alexander Semenov ◽  
Ilya Yakushev ◽  
Svetlana Pavlova ◽  
Ayaal Egorov ◽  
...  
Keyword(s):  
Electric Drive ◽  
Low Voltage ◽  
Variable Frequency ◽  
Variable Frequency Drive ◽  
Study Objective ◽  
Frequency Converters ◽  
Diamond Mining ◽  
Variable Frequency Drives ◽  
Voltage Frequency ◽  
Drive Systems

Mining enterprises are energy intensive facilities. The capacity of single technological units can reach 5 MW. Variable-frequency drive systems are often used to set them in motion. The paper analyzes the features of choosing and using variable-frequency drives under diamond mining conditions. The study objective is to formulate and formalize the problems of introducing and operating variable-frequency drives at diamond-mining enterprises to further develop and implement guidelines for improving the performance of this drive type. To achieve this objective, the use of variable frequency drives in various process units of diamond mining should be studied and analyzed. The units are considered, for which in recent years, electric drive systems have been groundlessly (according to the authors) chosen by the engineering staff of enterprises. A technical and economic comparison of low-voltage frequency converters with the same power but different control modes is performed. The economic indicators of introducing high-voltage and low-voltage frequency converters into an existing electric drive system are calculated and represented as a comparative table. Conclusions are made on the need to proceed with the research and develop guidelines for implementing frequency converters at diamond-mining enterprises.

Applications of analog and hybrid computers in electric power research

SIMULATION ◽  
1970 ◽  
Vol 15 (2) ◽  
pp. 73-79 ◽  
Author(s):  
P.C. Krause
Keyword(s):  
Power Systems ◽  
Electric Power ◽  
Variable Frequency ◽  
Variable Frequency Drive ◽  
Computation Techniques ◽  
Simulation Techniques ◽  
Dc Power ◽  
Methods Of Analysis ◽  
Hybrid Computation ◽  
Drive Systems

Recent applications of analog and hybrid computation techniques in research in variable-frequency drive systems and dc power systems are discussed. Although simulation techniques are not presented explicitly, publications are cited wherein the methods of analysis are set forth in de tail. Several new areas of electric power research which offer interesting and challenging applications of hybrid computation are briefly described.

Discrete Control of Air Conditioning Units in Mission Critical Facilities

2015 ◽  
Author(s):  
Sergio A. Bermudez ◽  
Hendrik F. Hamann ◽  
Levente J. Klein ◽  
Fernando J. Marianno ◽  
Alan C. Claassen
Keyword(s):  
Air Conditioning ◽  
Control Method ◽  
Discrete Control ◽  
Variable Frequency ◽  
Variable Frequency Drive ◽  
Variable Frequency Drives ◽  
Critical Facilities ◽  
Mission Critical ◽  
Safety Features ◽  
Almost All

For redundancy, almost all mission-critical facilities such as data centers are fitted with more air condition units than required. These units are most of the time heavily underutilized, where the fans within the units are still consuming energy circulating air without actually providing cooling. In more modern facilities such fans are equipped with variable frequency drives, which can reduce substantially the energy consumption if proper controls are implemented. While there have several solutions for controlling and optimizing such variable frequency drive operated air conditioning units, control systems without variable frequency drives (discrete on/off ACU controls) have not been addressed thoroughly. In this paper, we present a practical, distributed and automatic control method for such discrete air conditioning units. The technique includes several safety features and is based on dense environmental sensing and events like hotspots or device failures. We discuss this approach by way of example of a case study.

scholarly journals Energy saving system of cascade variable frequency induction electric drive

2019 ◽  
Vol 124 ◽  
pp. 01037 ◽  
Author(s):  
V. N. Meshcheryakov ◽  
D. V. Lastochkin ◽  
Z.M. Shakurova ◽  
S. Valtchev
Keyword(s):  
Energy Saving ◽  
Electric Drive ◽  
Block Diagram ◽  
Electrical Circuit ◽  
Variable Frequency ◽  
Variable Frequency Drive ◽  
Stator Current ◽  
Static Mechanical ◽  
Saving Mode ◽  
Induction Electric Drive

This paper discusses the wound rotor induction motor and variable-frequency drive (VFD) that regulates the stator voltage frequency. The stator and rotor windings are connected to a common electrical circuit. The slip energy of the motor goes to the DC link and feeds the stator winding of the motor. The block diagram of the electric drive, the equivalent circuit and the basic characteristic of the cascade VFD are considered. It is shown that the energy-saving mode with a minimum ratio “stator current/torque” is achieved at an angle between vectors of the stator current and the excitation current at the level of 45 degrees. The experimental static mechanical characteristics of the electric drive were obtained. These characteristics provide a limitation of the starting torque.

scholarly journals The impact of higher voltage and current harmonics on the operation of electrical systems

2019 ◽  
Vol 124 ◽  
pp. 05067 ◽  
Author(s):  
A.N. Egorov ◽  
Ya.S. Kharitonov ◽  
V.M. Khubieva ◽  
I.A. Yakushev ◽  
N.V. Golubtsov ◽  
...  
Keyword(s):  
Energy Efficiency ◽  
Electric Drive ◽  
Electromagnetic Compatibility ◽  
The Other ◽  
Variable Frequency ◽  
Maintenance Costs ◽  
Current Harmonics ◽  
Electrical Systems ◽  
Drive Systems ◽  
The Impact

The article deals with the assessment of impact of higher harmonics on the operation of variablefrequency electric drive systems used in processing units at mining enterprises. Beyond that, energy efficiency and operation experience of variable-frequency electric drive usage at mining enterprises were studied. The advantages and drawbacks of implementation of variable-frequency electric drive systems were found. They include energy saving and reducing maintenance costs for processing units on one hand, as well as losses due to their incorrect selection and electromagnetic compatibility distortion on the other hand.

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