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.

ENERGY-SAVING MODE OF OPERATION OF THE ELECTRIC DRIVE OF THE OIL CROPS CHOPPER

2019 ◽  
Vol 5 (1) ◽  
pp. 8-12
Author(s):  
Matkarim Ibragimov ◽  
◽  
Gulnoz Ergasheva
Keyword(s):  
Energy Saving ◽  
Electric Drive ◽  
Oil Crops ◽  
Mode Of Operation ◽  
Saving Mode

scholarly journals Braking mode simulation of induction motor of variable-frequency drive using stator current harmonics

2016 ◽  
Vol 16 (1) ◽  
pp. 87-98
Author(s):  
Dmitriy Statovoy ◽  
Nikolay Karnauhov ◽  
Feniks Bonilya ◽  
Maksim- Filimonov
Keyword(s):  
Induction Motor ◽  
Variable Frequency ◽  
Variable Frequency Drive ◽  
Current Harmonics ◽  
Stator Current

scholarly journals Improving power efficiency of underloaded pipelines with variable frequency drives

2020 ◽  
Vol 4 (1) ◽  
pp. 4-9
Author(s):  
Pavel A. Revel-Muroz ◽  
◽  
Georgy N. Matveev ◽  
Leonid M. Bekker ◽  
Konstantin Y. Shtukaturov ◽  
...  
Keyword(s):  
Power Consumption ◽  
Energy Saving ◽  
Power Efficiency ◽  
Electric Energy ◽  
Operating Conditions ◽  
Main Line ◽  
Variable Frequency ◽  
Variable Frequency Drive ◽  
Trunk Pipeline ◽  
Variable Frequency Drives

The paper considers the option to reduce power consumption in the operation of the underloaded trunk pipeline by engaging additional pump units with lower rotor r.p.m. control using variable frequency drive. Under these conditions, the operating point of the pumps (delivery rate, head) approaches to the rated output, thus increasing the efficiency of the pumps and decreasing the electricity power consumption for pumping operations. The paper presents comparative calculations of operating conditions for a section of the trunk pipeline with a specified pumping capacity of 35 million t/year (60 % of the design load) when one, two and three main line pumps with variable frequency drives are engaged. The power consumption for pumping is calculated using the dependence of the variable frequency drive and motor efficiencies on the electric motor load and rotational speed. Based on the results of calculations, the electric energy saving is determined when additional pumping units are engaged. The experience has shown that when the second main line pump was engaged, the electric energy saving for pumping was 3.7% compared to the condition with one pump running. However, if the third pump is engaged, the saving is only 1.9 % – the decrease is due to lower motor and variable frequency drive efficiencies in the underloaded condition.

Improving Energy Efficiency of the Variable Frequency Drive of the Forced-Draught Fan with the Two-Speed Asynchronous Motor

2015 ◽  
Vol 792 ◽  
pp. 128-133 ◽  
Author(s):  
Ekaterina A. Khramshina ◽  
Alexander S. Karandaev ◽  
Rifkhat R. Khramshin
Keyword(s):  
Electric Drive ◽  
Frequency Control ◽  
Asynchronous Motor ◽  
Energy Performance ◽  
Hot Water ◽  
Control Mode ◽  
Variable Frequency ◽  
Variable Frequency Drive ◽  
Low Speed ◽  
Variable Frequency Control

Based on the example of forced-draught fans of the GOFHWB-100 series hot water boilers (gas and oil fired hot water boilers) power supply reserves of the electric drive with two-speed asynchronous motor have been determined. The structural chart of the developed control system of the electric drive with winding changeover depending on the boiler performance is provided. The paper considers power consumption of electric drive in the variable frequency speed control mode at the motor operation on the high and low speed windings. It presents methods for calculation of energy performance based on computing the equivalent efficiency of the fluid-handling application. The analysis of the efficiency change has proved that the variable frequency control enables electric power savings at the low speed winding by 5 to 6%. The results obtained are recommended to be widely applied at the change-over of the electric drives with two-speed asynchronous motors to the variable frequency control of performance.

scholarly journals Online-Identification of Electromagnetic Parameters of an Induction Motor

2020 ◽  
Vol 63 (5) ◽  
pp. 423-440
Author(s):  
V. K. Tytiuk ◽  
M. L. Baranovskaya ◽  
O. P. Chorny ◽  
E. V. Burdilnaya ◽  
V. V. Kuznetsov ◽  
...  
Keyword(s):  
Equivalent Circuit ◽  
Induction Motor ◽  
Electric Drive ◽  
Frequency Control ◽  
Quality Parameters ◽  
Variable Frequency ◽  
Electromagnetic Parameters ◽  
Online Identification ◽  
Motor Operation ◽  
Induction Electric Drive

Incompliance of the settings of the system to control actual values of the parameters of a variable frequency induction electric drive may sometimes result in complete non-operability of a variable frequency electric drive as well as in the considerable reduction of the dynamic quality parameters. Such parameters as active rotor resistance, rotor inductance, and inductance of the magnetization circuit are available for the immediate measuring. They are not identified in terms of the acceptance tests, and the values presented in catalogues and reference books are calculated ones that may differ considerably from the real values of a certain machine. Despite constant studies by the researchers, a task to identify electromagnetic parameters of the equivalent circuit of an induction motor is still important and topical. The objective of the paper is to develop a method of online-identification of the electromagnetic parameters of an induction motor making it possible to implement accurate regulator adjustment of the frequency control system in terms of operational changes in the driving motor parameters. For the first time, the paper analyzes a steady mode of induction motor operation which does not apply T-network of the equivalent circuit of an induction motor. An approach has been proposed relying on the equation of an induction motor in three-phase fixed coordinate system obtained on the basis of the theory of generalized electromechanical converter. 

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