Acknowledgements Introduction p. 1 Electric Power Quality p. 3 Impacts of Power Quality Problems on End Users p. 4 Power Quality Standards p.

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1 Preface p. xv Acknowledgements p. xix Introduction p. 1 Electric Power Quality p. 3 Impacts of Power Quality Problems on End Users p. 4 Power Quality Standards p. 6 Power Quality Monitoring p. 7 Power Electronic Applications in Power Transmission Systems p. 8 HVDC Transmission p. 8 HVDC Light p. 9 Static Var Compensator (SVC) p. 10 Thyristor Controlled Series Compensator (TCSC) p. 12 Static Compensator (STATCOM) p. 14 Static Synchronous Series Compensator (SSSC) p. 16 Unified Power Flow Controller (UPFC) p. 16 Other FACTS Devices p. 17 Power Electronic Applications in Power Distribution Systems p. 18 Distributed Generation p. 22 References p. 23 Characterization of Electric Power Quality p. 27 Power Quality Terms and Definitions p. 29 Transients p. 29 Short Duration Voltage Variations p. 33 Long Duration Voltage variations p. 35 Voltage Imbalance p. 36 Waveform Distortion p. 36 Voltage Fluctuations p. 39 Power Frequency Variations p. 39 Power Acceptability Curves p. 39 Power Quality Problems p. 40 Poor Load Power Factor p. 41 Loads Containing Harmonics p. 42 Notching in Load Voltage p. 45 DC Offset in Loads p. 45 Unbalanced Loads p. 46 Disturbance in Supply Voltage p. 52 Conclusions p. 53 References p. 54 Analysis and Conventional Mitigation Methods p. 55 Analysis of Power Outages p. 55 Analysis of Unbalance p. 60

2 Symmetrical Components of Phasor Quantities p. 60 Instantaneous Symmetrical Components p. 64 Instantaneous Real and Reactive Powers p. 67 Analysis of Distortion p. 72 On-line Extraction of Fundamental Sequence Components from Measured Samples p. 76 Harmonic Indices p. 84 Analysis of Voltage Sag p. 86 Detroit Edison Sag Score p. 88 Voltage Sag Energy p. 88 Voltage Sag Lost Energy Index (VSLEI) p. 88 Analysis of Voltage Flicker p. 90 Reduced Duration and Customer Impact of Outages p. 92 Classical Load Balancing Problem p. 93 Open-Loop Balancing p. 94 Closed-Loop balancing p. 98 Current Balancing p. 102 Harmonic Reduction p. 104 Voltage Sag or Dip Reduction p. 108 Conclusions p. 110 References p. 111 Custom Power Devices: An Introduction p. 113 Utility-Customer Interface p. 114 Introduction to Custom Power Devices p. 116 Network Reconfiguring Devices p. 117 Load Compensation using DSTATCOM p. 121 Voltage Regulation using DSTATCOM p. 126 Protecting Sensitive Loads using DVR p. 127 Unified Power Quality Conditioner (UPQC) p. 130 Custom Power Park p. 131 Status of Application of CP Devices p. 134 Conclusions p. 136 References p. 136 Structure and Control of Power Converters p. 137 Inverter Topology p. 138 Single-Phase H-Bridge Inverter p. 138 Three-Phase Inverter p. 143 Hard-Switched Versus Soft-Switched p. 146 High Voltage Inverters p. 153 Combining Inverters for Increased Power and Voltage p. 154 Multi-Step Inverter p. 155 Multilevel Inverter p. 162

3 Chain Converter p. 167 Open-Loop Voltage Control p. 169 Sinusoidal PWM for H-Bridge Inverter p. 169 Sinusoidal PWM for three-phase Inverter p. 174 SPWM in Multilevel Inverter p. 175 Space Vector Modulation p. 178 Other Modulation Techniques p. 180 Closed-Loop Switching Control p. 182 Closed-Loop Modulation p. 182 Stability of Switching Control p. 183 Sampled Error Control p. 185 Hysteresis Control p. 187 Second and Higher Order Systems p. 188 Sliding Mode Controller p. 192 Linear Quadratic Regulator (LQR) p. 193 Tracking Controller Convergence p. 195 Condition for Tracking Reference Convergence p. 198 Deadbeat Controller p. 200 Pole Shift Controller p. 202 Sequential Linear Quadratic Regulator (SLQR) p. 203 Conclusions p. 210 References p. 212 Solid State Limiting, Breaking and Transferring Devices p. 215 Solid State Current Limiter p. 216 Current Limiter Topology p. 216 Current Limiter Operating Principle p. 217 Solid State Breaker (SSB) p. 220 Issues in Limiting and Switching Operations p. 223 Solid State Transfer Switch (SSTS) p. 225 Sag/Swell Detection Algorithms p. 232 Algorithm Based on Symmetrical Components p. 232 Algorithm Based on Two-Axis Transformation p. 233 Algorithm Based on Instantaneous Symmetrical Components p. 234 Conclusions p. 238 References p. 239 Load Compensation using DSTATCOM p. 241 Compensating Single-Phase Loads p. 242 Ideal Three-Phase Shunt Compensator Structure p. 245 Generating Reference Currents using Instantaneous PQ Theory p. 249 Generating Reference Currents using Instantaneous Symmetrical Components p. 259 Compensating Star Connected Loads p. 260

4 Compensating Delta Connected Loads p. 265 General Algorithm for Generating Reference Currents p. 268 Various Compensation Schemes and Their Characteristics Based on the General Algorithm p. 269 Discussion of Results p. 270 Generating Reference Currents when the Source is Unbalanced p. 276 Compensating to Equal Resistance p. 278 Compensating to Equal Source Currents p. 280 Compensating to Equal Average Power p. 282 Conclusions p. 285 References p. 285 Realization and Control of DSTATCOM p. 287 DSTATCOM Structure p. 288 Control of DSTATCOM Connected to a Stiff Source p. 291 DSTATCOM Connected to Weak Supply point p. 296 DSTATCOM Structure for Weak Supply Point Connection p. 299 Switching Control of DSTATCOM p. 302 DC Capacitor Control p. 308 DSTATCOM Current Control through Phasors p. 310 Case-1: When Both Load and Source are Unbalanced p. 311 Case-2: When Both Load and Source are Unbalanced and Load Contains Harmonics p. 313 Case-3: Both Load and Source are Unbalanced and Distorted p. 314 DC Capacitor Control p. 319 DSTATCOM in Voltage Control Mode p. 321 State Feedback Control of DSTATCOM in Voltage Control Mode p. 322 Output Feedback Control of DSTATCOM in Voltage Control Mode p. 327 Conclusions p. 330 References p. 330 Series Compensation of Power Distribution System p. 333 Rectifier Supported DVR p. 335 DC Capacitor Supported DVR p. 340 Fundamental Frequency Series Compensator Characteristics p. 341 Transient Operation of Series Compensator when the Supply is Balanced p. 346 Transient Operation when the Supply is Unbalanced or Distorted p. 348 Series Compensator Rating p. 350 An Alternate Strategy Based on Instantaneous Symmetrical Components p. 355 DVR Structure p. 359 Output Feedback Control of DVR p. 360 State Feedback Control of DVR p. 365 Voltage Restoration p. 370 Series Active Filter p. 372 Conclusions p. 376

5 References p. 376 Unified Power Quality Conditioner p. 379 UPQC Configurations p. 380 Right-Shunt UPQC Characteristics p. 381 Left-Shunt UPQC Characteristics p. 388 Structure and Control of Right-Shunt UPQC p. 391 Right-shunt UPQC Structure p. 391 Right-Shunt UPQC Control p. 392 Harmonic Elimination using Right-Shunt UPQC p. 398 Structure and Control of Left-Shunt UPQC p. 401 Left-Shunt UPQC Structure p. 401 Left-Shunt UPQC Control p. 402 Conclusions p. 405 References p. 406 Distributed Generation and Grid Interconnection p. 407 Distributed Generation--Connection Requirements and Impacts on the Network p. 407 Standards for Grid Connection p. 408 Key Requirements in Standards p. 408 Grid Friendly Inverters p. 409 Angle Stability for Inverters p. 410 Issues for Distributed Generation p. 410 Interaction and Optimal Location of DG p. 411 EigenAnalysis and Voltage Interaction p. 411 Simulation Results of EigenAnalysis and Voltage Interaction p. 415 Power Quality in DG p. 417 Mitigation of Voltage Dip during Motor Start p. 417 Harmonic Effects with DG p. 419 Voltage Flicker and Voltage Fluctuation p. 421 Islanding Issues p. 422 Anti-Islanding Protection p. 422 Vector Shift p. 423 Dedicated Islanding Operation p. 423 Rate of Change of Frequency (ROCOF) p. 424 Distribution Line Compensation p. 425 Line Voltage Sensitivity p. 425 Case-1: Heavy Load p. 426 Case-2: Light Load p. 435 Real Generation p. 435 Protection Issues for Distributed Generation p. 435 Technologies for Disributed Generation p. 437 Power Quality Impact from Different DG Types p. 437

6 Conclusions p. 441 References p. 441 Future Directions and Opportunities for Power Quality Enhancement p. 443 Power Quality Sensitivity p. 443 Costs of Power Quality p. 444 Mitigation of Power Quality Impacts from Sags p. 446 Utility Based Versus Customer Based Correction p. 447 Dips and Outages p. 448 Harmonic, Flicker and Voltage Spikes p. 449 Power Quality Contribution to the Network from Customer Owned Equipment p. 450 Issues p. 450 Addressing the Barriers to Customer Owned Grid Friendly Inverters p. 451 Interconnection Standards p. 451 Power Quality Performance Requirements and Validation p. 452 Commercial Customers p. 452 Regulator Requirements p. 452 An Example p. 453 Shape of Energy Delivery p. 454 Role of Compensators in Future Energy Delivery p. 455 Conclusions p. 456 References p. 456 Index p. 457 Table of Contents provided by Blackwell's Book Services and R.R. Bowker. Used with permission.

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