Page 9 - Advances in Renewable Energies and Power Technologies

viii Contents

CHAPTER 5 DMPPT PV System: Modeling and Control
Techniques.......................................................... 163
Marco Balato, Luigi Costanzo, Massimo Vitelli
1. Maximum Power Point Tracking of a Photovoltaic Source .... 163
2. Central Maximum Power Point Tracking and Distributed
Maximum Power Point Tracking....................................... 164
3. Necessity of Joint Adoption of Distributed Maximum
Power Point Tracking and Central Maximum Power Point
Tracking: Hybrid Maximum Power Point Tracking .............. 167
3.1 HMPPTS Technique..................................................171
3.2 HMPPTF Technique..................................................180
References......................................................................... 201
CHAPTER 6 Flexible Power Control of Photovoltaic Systems .... 207
Frede Blaabjerg, Ariya Sangwongwanich, Yongheng Yang
1. Introduction .................................................................. 207
2. Demand to Grid-Connected PV Systems ............................ 209
2.1 Overloading of the Grid (Overvoltage) During PV
Peak-Power Generation Period....................................209
2.2 Grid Voltage Fluctuation Because of Intermittency
of PV Energy...........................................................210
2.3 Limited-Frequency Regulation Capability to Stabilize
the Grid During Frequency Deviation...........................210
3. Possible Solutions for Flexible Power Control of PV
Systems........................................................................ 211
3.1 Integrating Energy Storage Systems.............................211
3.2 Installing Flexible Loads............................................212
3.3 Modifying the Control Algorithm of the Power
Converters...............................................................213
4. Power Converter Technology and Control for PV Systems .... 214
4.1 System Diagram of Grid-Connected PV Systems ...........214
4.2 Control Structure of Grid-Connected PV Systems...........217
4.3 Maximum Power Point Tracking Algorithms.................218
5. Flexible Active Power Control of PV Systems .................... 220
5.1 Power-Limiting Control Algorithm ..............................220
5.2 Power Ramp-Rate Control Algorithm...........................221
5.3 Power Reserve Control Algorithm ...............................222
6. Summary....................................................................... 225
References......................................................................... 226