Control and Grid Synchronization for Distributed Power Generation Systems Z.Leonowicz, PhD F. Blaabjerg, R. Teodorescu, M. Liserre, and A. V. Timbus: Overview of Control and Grid Synchronization for Distributed Power Generation Systems, IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, VOL. 53, NO. 5, OCTOBER 2006
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Control and Grid Synchronization for Distributed Power Generation Systems Z.Leonowicz, PhD F. Blaabjerg, R. Teodorescu, M. Liserre, and A. V. Timbus: Overview.
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Control and Grid Synchronization forDistributed Power
Generation Systems
Z.Leonowicz, PhD
F. Blaabjerg, R. Teodorescu, M. Liserre, and A. V. Timbus: Overview of Control and Grid Synchronization for Distributed Power Generation Systems, IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, VOL. 53, NO. 5, OCTOBER 2006
Renewable energy sources
• hydropower and wind energy• photovoltaic (PV) technology
• low efficiency• poor controllability of the distributed power generation systems (DPGSs)
based on wind and sun
Overview
1. Main DPGS structures,2. PV and fuel cell (FC) system3. Classification of wind turbine (WT)
systems with regard to the use of power electronics
4. Control structures for grid-side converter 5. Characteristics of control strategies
under grid fault conditions6. Grid synchronization methods
Causes
DPGS Control
• Input-side controller -extract the maximum power from the input source
• Grid-side controller1.control of active power generated to the
grid2.control of reactive power transfer
between the DPGS and the grid3.control of dc-link voltage4.ensure high quality of the injected power5.grid synchronization
Topologies of DGPS
• Photovoltaics and Fuel Cells – similar topology
• Wind Turbines – topology dependent on generator
Wind turbines
• WT Systems without Power Electronics
Wind turbines
• WT Systems with Power Electronics– Increased complexity– Higher cost– Better control of power input and grid interaction
• Partial Solution
WT with full-scale power converter
Control Structures for Grid-Connected DGPS
• Two cascaded loops– Fast internal current loop, regulates the
grid current– an external voltage loop, controls the dc-