Page 11 - Power Quality in Electrical Systems
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Contents ix
Summary 107
References 108
Chapter 8. Methods for Correction of Power-Quality
Problems 109
Introduction 109
Correction Methods 110
Voltage disturbances versus correction methods 111
Reliability 113
Design of load equipment 115
The design of electric-power supply systems 117
Power harmonic filters 119
Utilization-dynamic voltage compensators 119
Uninterruptible power supplies 119
Transformers 120
Standby power systems 122
Summary 126
References 126
Chapter 9. Uninterruptible Power Supplies 129
Introduction 129
History 131
Types of UPS Equipment 133
Commercial equipment 134
Energy storage 137
Batteries 138
Flywheels 139
Fuel cells 141
Ultracapacitors 144
Summary 145
References 145
Chapter 10. Dynamic Voltage Compensators 147
Introduction 147
Principle of Operation 148
Operation on ITIC curve 151
Detection of disturbance and control 152
Commercial equipment 153
Summary 154
References 154
Chapter 11. Power Quality Events 155
Introduction 155
Method 1 155
Method 2 156
Personal Computers 156
Power-quality characteristics 157
Modes of malfunction 160
Sensitivity to voltage sags and interruptions 160
Correction measures 162
