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GRID CONVERTERS FOR
PHOTOVOLTAIC AND
WIND POWER SYSTEMS
Grid Converters for Photovoltaic and Wind Power Systems Remus Teodorescu, Marco Liserre and Pedro Rodríguez
© 2011 John Wiley & Sons, Ltd. ISBN: 978-0-470-05751-3
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GRID CONVERTERS FOR
PHOTOVOLTAIC AND
WIND POWER SYSTEMS
Remus Teodorescu
Aalborg University, Denmark
Marco Liserre
Politecnico di Bari, Italy
Pedro Rodr´ıguez
Technical University of Catalonia, Spain
A John Wiley and Sons, Ltd., Publication
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This edition first published 2011
C 2011, John Wiley & Sons, Ltd
Registered office
John Wiley & Sons, Ltd, The Atrium, Southern Gate, Chichester, West Sussex, PO19 8SQ, United Kingdom
For details of our global editorial offices, for customer services and for information about how to apply for permission to
reuse the copyright material in this book please see our website at www.wiley.com.
The right of the author to be identified as the author of this work has been asserted in accordance with the Copyright,
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MATLAB R
accuracy of the text or exercises in this book. This book’s use or discussion of MATLAB R
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Library of Congress Cataloguing-in-Publication Data
Teodorescu, Remus.
Grid converters for photovoltaic and wind power systems / Remus Teodorescu, Marco Liserre, Pedro Rodr´ıguez.
p. cm.
Includes bibliographical references and index.
ISBN 978-0-470-05751-3 (hardback)
1. Electric current converters.
systems–Equipment and supplies.
2. Photovoltaic power systems–Equipment and supplies.
I. Liserre, Marco.
II. Rodr´ıguez, Pedro.
III. Title.
TK7872.C8T46 2011
621.31
244–dc22
A catalogue record for this book is available from the British Library.
Print ISBN: 9780470057513
E-PDF ISBN: 9780470667040
O-book ISBN: 9780470667057
Set in in 10/12pt Times by Aptara Inc., New Delhi, India
3. Wind energy conversion
2010031106
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Contents
About the Authors
Preface
Acknowledgements
Introduction
1
1.1 Wind Power Development
1.2
1.3
Photovoltaic Power Development
The Grid Converter – The Key Element in Grid Integration
of WT and PV Systems
References
2
2.1
2.2
2.3
2.4
2.5
2.6
2.7
Basic Full-Bridge Inverter
H5 Inverter (SMA)
HERIC Inverter (Sunways)
REFU Inverter
Full-Bridge Inverter with DC Bypass – FB-DCBP (Ingeteam)
Full-Bridge Zero Voltage Rectifier – FB-ZVR
Summary of H-Bridge Derived Topologies
Photovoltaic Inverter Structures
Introduction
Inverter Structures Derived from H-Bridge Topology
2.2.1
2.2.2
2.2.3
2.2.4
2.2.5
2.2.6
2.2.7
Inverter Structures Derived from NPC Topology
2.3.1
2.3.2
2.3.3
Typical PV Inverter Structures
2.4.1
Neutral Point Clamped (NPC) Half-Bridge Inverter
Conergy NPC Inverter
Summary of NPC-Derived Inverter Topologies
H-Bridge Based Boosting PV Inverter with High-Frequency
Transformer
Three-Phase PV Inverters
Control Structures
Conclusions and Future Trends
References
xiii
xv
xvii
1
1
3
4
4
5
5
6
7
11
13
15
17
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3
3.1
3.2
3.3
3.4
3.5
3.6
4
4.1
4.2
4.3
4.4
4.5
4.6
4.7
5
5.1
5.2
IEEE 1547 Interconnection of Distributed Generation
IEC 61727 Characteristics of Utility Interface
VDE 0126-1-1 Safety
IEC 61000 Electromagnetic Compatibility (EMC – low frequency)
EN 50160 Public Distribution Voltage Quality
Grid Requirements for PV
Introduction
International Regulations
3.2.1
3.2.2
3.2.3
3.2.4
3.2.5
Response to Abnormal Grid Conditions
3.3.1
3.3.2
3.3.3
Power Quality
3.4.1
3.4.2
3.4.3
Anti-islanding Requirements
3.5.1
3.5.2
3.5.3
Summary
References
Voltage Deviations
Frequency Deviations
Reconnection after Trip
DC Current Injection
Current Harmonics
Average Power Factor
AI Defined by IEEE 1547/UL 1741
AI Defined by IEC 62116
AI Defined by VDE 0126-1-1
PLL Based on a T/4 Transport Delay
PLL Based on the Hilbert Transform
PLL Based on the Inverse Park Transform
Grid Synchronization in Single-Phase Power Converters
Introduction
Grid Synchronization Techniques for Single-Phase Systems
Grid Synchronization Using the Fourier Analysis
4.2.1
4.2.2
Grid Synchronization Using a Phase-Locked Loop
Phase Detection Based on In-Quadrature Signals
Some PLLs Based on In-Quadrature Signal Generation
4.4.1
4.4.2
4.4.3
Some PLLs Based on Adaptive Filtering
4.5.1
4.5.2
4.5.3
4.5.4
The SOGI Frequency-Locked Loop
4.6.1
Analysis of the SOGI-FLL
Summary
References
The Enhanced PLL
Second-Order Adaptive Filter
Second-Order Generalized Integrator
The SOGI-PLL
Islanding Detection
Introduction
Nondetection Zone
Contents
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32
32
33
33
34
34
35
35
36
36
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5.3
5.4
5.5
5.6
Overview of Islanding Detection Methods
Passive Islanding Detection Methods
OUF–OUV Detection
5.4.1
Phase Jump Detection (PJD)
5.4.2
Harmonic Detection (HD)
5.4.3
5.4.4
Passive Method Evaluation
Active Islanding Detection Methods
Frequency Drift Methods
5.5.1
Voltage Drift Methods
5.5.2
5.5.3
Grid Impedance Estimation
PLL-Based Islanding Detention
5.5.4
5.5.5
Comparison of Active Islanding Detection Methods
Summary
References
Grid Converter Structures for Wind Turbine Systems
Introduction
6
6.1
6.2 WTS Power Configurations
6.3
Grid Power Converter Topologies
6.3.1
6.3.2
Single-Cell (VSC or CSC)
Multicell (Interleaved or Cascaded)
6.4 WTS Control
6.5
7
7.1
7.2
7.3
7.4
7.5
Generator-Side Control
WTS Grid Control
6.4.1
6.4.2
Summary
References
Grid Requirements for WT Systems
Introduction
Grid Code Evolution
7.2.1
Denmark
Germany
7.2.2
Spain
7.2.3
UK
7.2.4
7.2.5
Ireland
US
7.2.6
China
7.2.7
7.2.8
Summary
Frequency and Voltage Deviation under Normal Operation
Active Power Control in Normal Operation
7.4.1
7.4.2
Reactive Power Control in Normal Operation
7.5.1
7.5.2
7.5.3
Power Curtailment
Frequency Control
Germany
Spain
Denmark
vii
96
98
98
99
99
103
104
104
110
110
114
119
121
121
123
123
124
128
128
133
135
136
139
142
142
145
145
146
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149
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7.6
7.7
7.8
7.9
8
8.1
8.2
8.3
8.4
8.5
8.6
9
9.1
9.2
9.3
UK
Ireland
US
Germany
Spain
US-WECC
7.5.4
7.5.5
7.5.6
Behaviour under Grid Disturbances
7.6.1
7.6.2
7.6.3
Discussion of Harmonization of Grid Codes
Future Trends
7.8.1
7.8.2
7.8.3
Summary
References
Local Voltage Control
Inertia Emulation (IE)
Power Oscillation Dumping (POD)
Unbalanced Grid Voltages during a Grid Fault
Transient Grid Faults, the Voltage Sags (Dips)
Propagation of Voltage Sags
Grid Synchronization in Three-Phase Power Converters
Introduction
The Three-Phase Voltage Vector under Grid Faults
8.2.1
8.2.2
8.2.3
The Synchronous Reference Frame PLL under Unbalanced and Distorted
Grid Conditions
The Decoupled Double Synchronous Reference
Frame PLL (DDSRF-PLL)
8.4.1
8.4.2
8.4.3
8.4.4
The Double Second-Order Generalized Integrator FLL (DSOGI-FLL)
8.5.1
8.5.2
8.5.3
8.5.4
Summary
References
Structure of the DSOGI
Relationship between the DSOGI and the DDSRF
The FLL for the DSOGI
Response of the DSOGI-FLL
The Double Synchronous Reference Frame
The Decoupling Network
Analysis of the DDSRF
Structure and Response of the DDSRF-PLL
Grid Converter Control for WTS
Introduction
Model of the Converter
9.2.1
9.2.2
AC Voltage and DC Voltage Control
9.3.1
9.3.2
Mathematical Model of the L-Filter Inverter
Mathematical Model of the LCL-Filter Inverter
Management of the DC Link Voltage
Cascaded Control of the DC Voltage through the AC Current
Contents
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Tuning Procedure of the PI Controller
PI-Based Voltage Control Design Example
Synchronous Frame VOC: PQ Open-Loop Control
Synchronous Frame VOC: PQ Closed-Loop Control
Stationary Frame VOC: PQ Open-Loop Control
Stationary Frame VOC: PQ Closed-Loop Control
Virtual-Flux-Based Control
Direct Power Control
9.3.3
9.3.4
Voltage Oriented Control and Direct Power Control
9.4.1
9.4.2
9.4.3
9.4.4
9.4.5
9.4.6
Stand-alone, Micro-grid, Droop Control and Grid Supporting
9.5.1
9.5.2
9.5.3
Summary
References
Grid-Connected/Stand-Alone Operation without Load Sharing
Micro-Grid Operation with Controlled Storage
Droop Control
9.4
9.5
9.6
Control of Grid Converters under Grid Faults
Introduction
10
10.1
10.2 Overview of Control Techniques for Grid-Connected Converters under
Unbalanced Grid Voltage Conditions
10.3 Control Structures for Unbalanced Current Injection
10.3.1
Decoupled Double Synchronous Reference Frame Current
Controllers for Unbalanced Current Injection
Resonant Controllers for Unbalanced Current Injection
Instantaneous Active–Reactive Control (IARC)
Positive- and Negative-Sequence Control (PNSC)
Average Active–Reactive Control (AARC)
Balanced Positive-Sequence Control (BPSC)
Performance of the IARC, PNSC, AARC and BPSC Strategies
Flexible Positive- and Negative-Sequence Control (FPNSC)
10.3.2
Power Control under Unbalanced Grid Conditions
10.4.1
10.4.2
10.4.3
10.4.4
10.4.5
10.4.6
Flexible Power Control with Current Limitation
10.5.1
10.5.2
10.5.3
10.5.4
10.5.5
Summary
References
Locus of the Current Vector under Unbalanced Grid Conditions
Instantaneous Value of the Three-Phase Currents
Estimation of the Maximum Current in Each Phase
Estimation of the Maximum Active and Reactive Power Set-Point
Performance of the FPNSC
10.4
10.5
10.6
Grid Filter Design
Introduction
Filter Topologies
11
11.1
11.2
11.3 Design Considerations
11.4
11.5 Resonance Problem and Damping Solutions
Practical Examples of LCL Filters and Grid Interactions
ix
216
217
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221
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222
224
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226
228
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229
231
234
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237
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238
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