About 50-70 % of all energy produced in the world is consumed by the electric drive. However, its operation is often accompanied by the appearance of various kinds of defects and damage caused by poor-quality manufacturing, failure of individual elements of electric motors without loss of performance. It results in more energy consumption and premature repair of electrical equipment, and an increase in material costs and enlarged use of energy resources. To eliminate the negative consequences of the operation of an electric drive with defects and damage to induction motors, the monograph presents methods and systems of fault-tolerant control that allow the adjustment of the operating modes using the means of a variable-frequency electric drive. The main idea of such systems is to maintain the operability of technological mechanisms in the event of various malfunctions. The worked out methods and systems make it possible to detect various types of damage at the initial stages of their development. Then, based on the obtained information, they allow upgrading the control algorithm to maintain the operable state of the electromechanical equipment to the possibility of replacing the corresponding equipment or repairing the electric drive motor. That is, the most rational area for using the developed fault-tolerant control systems is industrial equipment, which must continue to operate, despite the deterioration in dynamic characteristics and energy efficiency.
Author(s): Mykhaylo V. Zagirnyak, Andrii P. Kalinov, Anna V. Kostenko, Viacheslav O. Melnykov
Series: Electrical Engineering Developments
Publisher: Nova Science Publishers
Year: 2022
Language: English
Pages: 296
City: New York
Contents
Preface
Acknowledgments
Abbreviations List
Main Symbols
Chapter 1
The Analysis of Induction Motor Damages and the Methods for Their Compensation by Means of a Variable-Frequency Electric Drive
1.1. The Trends of Development of General Industrial AC Variable-Frequency Electric Drives
1.2. The Analysis of the Causes for the Deterioration of the Operation Efficiency of the Variable-Frequency Electric Drive
1.3. The Analysis of the Prerequisites for Improving the Control Methods and Enhancing the Efficiency of VFED with Asymmetric IM
1.4. The Analysis of Typical Damages to Power Electric Circuits of Variable-Frequency ED
1.4.1. Heat Loads
1.4.2. Electrical Loads
1.4.3. Mechanical Loads
1.4.4. The influence of Environmental Factors
1.5. The Review of the Existing Methods for the Control of IM with a Damage to the Stator Power Circuit
Conclusion
Chapter 2
Mathematical Modeling of the Systems of a Variable-Frequency Electric Drive
2.1. The Implementation of the Power Unit of a Variable-Frequency AC Electric Drive with a Frequency Converter
2.2. Mathematical Modeling of Alternating Current Electric Drive Systems with Vector Control
2.3. A Mathematical Model of an Inductions Motor with Asymmetric Stator Windings
2.4. The Assessment of the Operation Modes of the Variable-Frequency Electric Drive with a Vector Control
2.4.1. The Assessment of Losses in the Power Part of the Variable-Frequency ED
2.4.2. The Assessment of Variable Components of Power Consumption and Electromagnetic Torque of IM
Conclusion
Chapter 3
The Correction of the Operation Modes of Induction Motors with Stator Asymmetrical Windings during Scalar Control
3.1. The Development of a System to Compensate for the Impact of IM Asymmetry by Means of VFED
3.1.1. The Development of a Method for Compensating for the Influence of a Three-Phase IM Asymmetry by Means of VFED
3.1.1.1. The Compensation for the Variable Components of IM Instantaneous Power
3.1.2. Mathematical Modeling of the Developed System of Compensation for the Influence of the Asymmetry of Three-Phase Loading by Means of VFED
3.1.2.1. Modeling the Operation of VFED with the System of Compensation for the Influence of the Asymmetry of Three-Phase Active-Inductive Loading
3.1.2.2. Modeling of VFED Operation with the System of Compensation for the Influence of IM Asymmetry
3.2. The Assessment of the Stator Phase Asymmetry Influence on IM Service Life
3.3. The Research of the Losses in the Power Semiconductor Keys of the Autonomous Voltage Inverter with the Compensation for IM Asymmetry Influence
3.4. The Calculation of the Voltage Regulator in the System of Compensation for IM Asymmetry Influence by Means of VFED
3.5. The Calculation of the Recommended Loading Level of an Asymmetric Induction Motor
Conclusion
Chapter 4
The Correction of the Operation Modes of Induction Motors with Stator Asymmetrical Windings during Vector Control
4.1. The Compensation for the Variable Component of the Electromagnetic Torque of an Induction Motor
4.2. The Compensation for the Variable Component of the Consumed Active Power of the Induction Motor
4.3. Phase Vector Control System for an Induction Motor with Asymmetric Stator Windings
4.3.1. The Theoretical Bases of the use of the Phase Control Systems for Asymmetric Motors
4.3.2. The Features of Creating the Systems of IM Phase-by-Phase Control
4.3.3. The Adjustment of the Phase Control System to Compensate for the Variable Component of IM Electromagnetic Torque
4.3.4. The Adjustment of the Phase Control System to Compensate for the Variable Component of IM Power Consumption
Conclusion
Chapter 5
The Determination of the Parameters of Induction Motors during Operation with a Frequency Converter
5.1. The Analysis of the Methods for the Identification of the Electromagnetic Parameters of the Induction Motor in the Start-up Period
5.1.1. The Stator Resistance
5.1.2. The Stator Inductive Reactance
5.1.2.1. Method 1 [218]
5.1.2.2. Method 2 [214]
5.1.2.3. Method 3 [219]
5.1.2.4. Method 4 [161]
5.1.2.5. Method 5 [220]
5.1.3. The Inductance of the Magnetization Circuit
5.1.3.1. Method 1 [217]
5.1.3.2. Method 2 [220]
5.1.3.3. Method 3 [161]
5.1.4. Rotor Resistance
5.1.4.1. Method 1 [221]
5.1.4.2. Method 2 [222]
5.1.4.3. Method 3 [222]
5.1.4.4. Method 4 [219]
5.1.4.5. Method 5 [161]
5.1.4.6. Method 6 [220]
5.2. The Assessment of Induction Motor Parameters Based on the Low Frequency Sinusoid Test Effects
5.3. The Systems for Measuring the Electrical Parameters of the Variable-Frequency Electric Drive
5.4. The Experimental Verification of the System of the Assessment of the Parameters of the Induction Motor in the Pre-Start Period
5.5. The Influence of the Signal Amplitude and Phase Errors on the Determination of Induction Motor Electromagnetic Parameters
Conclusion
Chapter 6
The Development of the Methods for the Indirect Determination of the Energy Characteristics of IM Operation and the Improvement of the Economic Efficiency of the Induction Motor Stock Operation
6.1. The Quantitative Assessment of the Error of the Calculation of the Active Instantaneous Power of Three-Phase Systems in the Serial Poll of ADC of Voltage and Current Channels
6.2. The Assessment of the Energy Indicators of the Operation of Variable-Frequency Electric Drives on the Basis of Current and Voltage Instantaneous Values
6.3. Working out a Method for the Improvement of the Economic Efficiency of the Operation of Variable-Frequency Electric Drive Induction Motors
Conclusion
Conclusion
References
About the Authors
Index
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