Reduced DC-link Capacitance AC Motor Drives

218 Pages·2020·14.834 MB·English

by  Gaolin Wang, Nannan Zhao, Guoqiang Zhang, Dianguo Xu

Gaolin Wang
Nannan Zhao
Guoqiang Zhang
Dianguo Xu
Reduced
DC-link
Capacitance AC
Motor Drives
Reduced DC-link Capacitance AC Motor Drives
Gaolin Wang Nannan Zhao
(cid:129) (cid:129)
Guoqiang Zhang Dianguo Xu
(cid:129)
Reduced DC-link
Capacitance AC Motor
Drives
123
GaolinWang Nannan Zhao
Harbin Institute of Technology Harbin Institute of Technology
Harbin, Heilongjiang, China Harbin, Heilongjiang, China
Guoqiang Zhang Dianguo Xu
Harbin Institute of Technology Harbin Institute of Technology
Harbin, Heilongjiang, China Harbin, Heilongjiang, China
ISBN978-981-15-8565-4 ISBN978-981-15-8566-1 (eBook)
https://doi.org/10.1007/978-981-15-8566-1
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Preface
ReducedDC-linkcapacitancemotordrivesystemhasbeendevelopedforitshigher
reliability, higher power density, lower cost, and longer lifetime. Compared with
the conventional drive system equipped with large volume electrolytic capacitors,
the DC-link capacitance is reduced remarkably. The DC-link voltage fluctuates
obviously,andthecouplingbetweenthegridinputsideandtheinverteroutputside
is enhanced. Many techniques have been developed to improve the drive system
performance in the last few decades.
The book focuses on the advanced control of reduced dc-link capacitance AC
motor drives. The proposed control strategies are verified by experimental results,
which include high power factor control, drive system stability control, beat phe-
nomenon suppression, enhanced flux-weakening control, anti-overvoltage control,
etc. The major features of this book are the systematic analysis, effective and
optimized control of the practical issues in industry application, which could help
thereaders tolearnthereduceddc-linkcapacitancePMSMdrivesandpromotethe
drive system application. This book could benefit researchers, engineers, and stu-
dents in the field of AC motor drives.
Harbin, China Gaolin Wang
Nannan Zhao
Guoqiang Zhang
Dianguo Xu
v
Contents
1 Basic Knowdge of AC Motor Drives. . . . . . . . . . . . . . . . . . . . . . . . . 1
1.1 Structure and Mathematical Model . . . . . . . . . . . . . . . . . . . . . . . 1
1.1.1 PMSM Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.1.2 PMSM Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1.3 PMSM Mathematical Model in Three-Phase
Coordinate Frame . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2 Space Vector and Coordinate Transformation. . . . . . . . . . . . . . . . 5
1.2.1 Introduction of PMSM Space Vector . . . . . . . . . . . . . . . . 5
1.2.2 Coordinate Transformation. . . . . . . . . . . . . . . . . . . . . . . . 6
1.2.3 PMSM Mathematical Model in Different Coordinate
Frames . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
1.3 Space Vector Pulse Width Modulation (SVPWM) . . . . . . . . . . . . 11
1.3.1 Principle and Realization of SVPWM. . . . . . . . . . . . . . . . 11
1.3.2 Evaluation of Maximum Voltage Vector in SVPWM. . . . . 14
1.4 Vector Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
1.4.1 Basic Structure of Vector Control System . . . . . . . . . . . . . 16
1.4.2 Principle of Field Orientation Control. . . . . . . . . . . . . . . . 16
1.5 Model Based Sensorless Control . . . . . . . . . . . . . . . . . . . . . . . . . 17
1.5.1 Concept of Extended Electromotive Force. . . . . . . . . . . . . 17
1.5.2 Sliding-Mode Observer Construction . . . . . . . . . . . . . . . . 18
1.5.3 Full-Order Sliding-Mode Observer . . . . . . . . . . . . . . . . . . 19
1.5.4 Stability Analysis of Sliding-Mode Observer. . . . . . . . . . . 21
1.6 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
2 High Power Factor Control of Grid Input Current . . . . . . . . . . . . . 27
2.1 Power Characteristic Analysis of Drive System . . . . . . . . . . . . . . 28
2.1.1 Topology of Single-Phase Reduced DC-Link
Capacitance Motor Drives . . . . . . . . . . . . . . . . . . . . . . . . 28
vii
viii Contents
2.1.2 Grid Input Power. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
2.1.3 Inverter Output Power . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
2.2 Inverter Power Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
2.2.1 Principle of Inverter Power Control . . . . . . . . . . . . . . . . . 30
2.2.2 Inverter Power Control Scheme . . . . . . . . . . . . . . . . . . . . 31
2.2.3 Inverter Power Control Loop . . . . . . . . . . . . . . . . . . . . . . 31
2.3 Parameter Determination of Inverter Power Controller . . . . . . . . . 33
2.3.1 Mathematical Model of Inverter Power Control Loop . . . . 33
2.3.2 Parameters Design of PR Controller . . . . . . . . . . . . . . . . . 34
2.3.3 Parameters Determination. . . . . . . . . . . . . . . . . . . . . . . . . 35
2.4 Inverter Power Compensation Based on DC-Link Voltage
Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
2.4.1 Performance Evaluation of Inverter Power Control . . . . . . 35
2.4.2 Closed Loop Control of DC-Link Voltage Control . . . . . . 36
2.4.3 DC-Link Voltage Reference Generation . . . . . . . . . . . . . . 38
2.4.4 DC-Link Voltage Control Realization . . . . . . . . . . . . . . . . 39
2.4.5 Analysis of Maximum Motor Speed . . . . . . . . . . . . . . . . . 42
2.5 Experimental Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
2.6 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
3 Resonance Suppression Between Line Inductor and DC-Link
Capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
3.1 Analysis of LC Resonance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
3.1.1 Drive System Model Construction . . . . . . . . . . . . . . . . . . 53
3.1.2 Stability Analysis of Drive System . . . . . . . . . . . . . . . . . . 54
3.1.3 Influence of DC-Link Capacitance on Drive System . . . . . 55
3.2 DC-Link Voltage Feedback Based Active Damping Control
Method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
3.2.1 Principle of Active Damping Control . . . . . . . . . . . . . . . . 56
3.2.2 Direct Damping Current to Stabilize Drive System . . . . . . 57
3.2.3 Stability Analysis Using Routh-Hurwitz Criterion . . . . . . . 58
3.2.4 Realization of Direct Damping Current. . . . . . . . . . . . . . . 60
3.2.5 Parameters Determination of Direct Damping Current
Generator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
3.2.6 Experimental Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
3.3 Virtual Resistor Based Active Damping Control. . . . . . . . . . . . . . 69
3.3.1 Different Configurations of Virtual Damping Resistor . . . . 69
3.3.2 Stability Analysis of Virtual Resistor Based Active
Damping Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
Contents ix
3.4 Inductor Current Feedback Based Active Damping Control
Method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
3.4.1 Realization of Inductor Current Feedback Control . . . . . . . 73
3.4.2 Compensation of Distorted Grid Voltage. . . . . . . . . . . . . . 73
3.4.3 Experimental Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
3.5 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
4 Impedance Model Based Stability Control . . . . . . . . . . . . . . . . . . . . 85
4.1 Impedance Modeling of PMSM. . . . . . . . . . . . . . . . . . . . . . . . . . 85
4.2 System Performance Evaluation. . . . . . . . . . . . . . . . . . . . . . . . . . 88
4.2.1 System Stability Analysis. . . . . . . . . . . . . . . . . . . . . . . . . 88
4.2.2 Analysis of Grid Current Harmonics. . . . . . . . . . . . . . . . . 89
4.3 DC-Link Voltage Feedback Stability Control Method. . . . . . . . . . 90
4.3.1 DC-Link Voltage Feedback Based Stability Control
Method. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
4.3.2 System Stability Analysis. . . . . . . . . . . . . . . . . . . . . . . . . 90
4.3.3 Analysis of Grid Current Harmonics. . . . . . . . . . . . . . . . . 91
4.4 Grid Current Feedback Based Stabilization Control Method . . . . . 92
4.4.1 Principle of the Grid Current Feedback Based
Stabilization Control Method . . . . . . . . . . . . . . . . . . . . . . 92
4.4.2 System Stability Analysis. . . . . . . . . . . . . . . . . . . . . . . . . 93
4.4.3 Analysis of Grid Current Harmonics. . . . . . . . . . . . . . . . . 95
4.4.4 Experimental Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96
4.5 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
5 Analysis and Suppression of Beat Phenomenon . . . . . . . . . . . . . . . . 103
5.1 Beat Phenomenon Simply Caused by DC-Link Voltage . . . . . . . . 103
5.2 Beat Phenomenon of Reduced DC-Link Capacitance IPMSM
Drives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104
5.2.1 Effect of Fluctuated DC-Link Voltage on Motor
Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104
5.2.2 Interaction Between DC-Link Voltage Fluctuation
and Load Torque Fluctuation . . . . . . . . . . . . . . . . . . . . . . 106
5.3 Drive System Performance Analysis Influenced by Beat
Phenomenon . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108
5.3.1 Effect of Beat Phenomenon on Grid Current . . . . . . . . . . . 108
5.3.2 Effect of Beat Phenomenon on Motor Speed. . . . . . . . . . . 108
5.4 Beat Phenomenon Suppression Method . . . . . . . . . . . . . . . . . . . . 109
5.4.1 Principle of Beat Phenomenon Suppression Method . . . . . 109
5.4.2 Beat Phenomenon Suppression of Grid Current. . . . . . . . . 110
5.4.3 Beat Phenomenon Suppression of Motor Speed. . . . . . . . . 111
5.4.4 Experimental Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112
x Contents
5.5 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121
References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121
6 Flux-Weakening Control Method . . . . . . . . . . . . . . . . . . . . . . . . . . . 123
6.1 Conventional Flux-Weakening Control . . . . . . . . . . . . . . . . . . . . 123
6.2 Torque Ripple Analysis Caused by DC-Link Voltage
Fluctuation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124
6.2.1 Introduction of Three-Phase Reduced DC-Link
Capacitance PMSM Drives. . . . . . . . . . . . . . . . . . . . . . . . 124
6.2.2 Analysis of Influence on Stator Voltage . . . . . . . . . . . . . . 125
6.2.3 Analysis of Torque Ripple . . . . . . . . . . . . . . . . . . . . . . . . 128
6.3 Adjustable Maximum Voltage Based Flux-Weakening Control . . . 131
6.3.1 Principle of the Control Method. . . . . . . . . . . . . . . . . . . . 131
6.3.2 Realization of the Control Method . . . . . . . . . . . . . . . . . . 133
6.3.3 Analysis of Stator Current Vector Trajectory. . . . . . . . . . . 135
6.4 Power Loss Analysis of Flux-Weakening Control. . . . . . . . . . . . . 136
6.5 Experimental Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137
6.6 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145
References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146
7 Motor Loss Based Anti-Overvoltage Control . . . . . . . . . . . . . . . . . . 147
7.1 Braking Performance Analysis Under Reduced DC-Link
Capacitance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147
7.1.1 Electrical Power Analysis Under Breaking Process . . . . . . 147
7.1.2 DC-Link Voltage Analysis Under Breaking Process. . . . . . 149
7.2 Motor Loss Based Braking Method. . . . . . . . . . . . . . . . . . . . . . . 150
7.3 Stator Current Vector Orientation Based Anti-Overvoltage
Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152
7.3.1 Principle Analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152
7.3.2 Current Trajectory Planning in Braking Process. . . . . . . . . 153
7.3.3 Anti-Overvoltage Realization Using Stator Current
Vector Orientation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 154
7.3.4 Parameters Determination of Voltage Controller . . . . . . . . 156
7.3.5 Experimental Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158
7.4 Energy Control Error Analysis of Braking Scheme. . . . . . . . . . . . 162
7.5 Dual Anti-Overvoltage Control Method . . . . . . . . . . . . . . . . . . . . 168
7.5.1 Principle Analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 168
7.5.2 Realization of Dual Anti-Overvoltage Control Method. . . . 169
7.5.3 Analysis of Energy Control Error . . . . . . . . . . . . . . . . . . . 170
7.5.4 Voltage Controller Coefficient Autoregulation . . . . . . . . . . 171
7.5.5 Experimental Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . 174
7.6 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 185
References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 187
Contents xi
8 Optimized Overmodulation Strategy. . . . . . . . . . . . . . . . . . . . . . . . . 189
8.1 Overmodulation Method of SVPWM. . . . . . . . . . . . . . . . . . . . . . 189
8.1.1 Conventional Overmodulation of SVPWM . . . . . . . . . . . . 189
8.1.2 Analysis of the Overmodulation in Reduced DC-Link
Capacitance PMSM Drives. . . . . . . . . . . . . . . . . . . . . . . . 190
8.2 Voltage Distortion Caused by Convensional Dual-Mode
Overmodulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 191
8.3 Transition Analysis of Uncontrollable Modulation Region . . . . . . 196
8.4 Voltage Bundary Based Overmodulation Scheme. . . . . . . . . . . . . 198
8.4.1 Optimized Voltage Boundary Based Overmodulation
Strategy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 198
8.4.2 Experimental Results of Optimized Voltage Boundary
Based Overmodulation Strategy . . . . . . . . . . . . . . . . . . . . 202
8.5 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 207
References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 210