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Accession Number DE2013-1050321
Title Real and Reactive Power Control of a Three-Phase Single-Stage PV System and PV Voltage Stability.
Publication Date 2013
Media Count 8p
Personal Author D. T. Rizy F. Li H. Li P. Irminger S. Adhikari Y. Xu
Abstract Grid-connected photovoltaic (PV) systems with power electronic interfaces can provide both real and reactive power to meet power system needs with appropriate control algorithms. This paper presents the control algorithm design for a three-phase single-stage grid-connected PV inverter to achieve either maximum power point tracking (MPPT) or a certain amount of real power injection, as well as the voltage/var control. The switching between MPPT control mode and a certain amount of real power control mode is automatic and seamless. Without the DC-to-DC booster stage, PV DC voltage stability is an important issue in the control design especially when the PV inverter is operating at maximum power point (MPP) with voltage/var control. The PV DC voltage collapse phenomenon and its reason are discussed. The method based on dynamic correction of the PV inverter output is proposed to ensure PV DC voltage stability. Simulation results of the single-stage PV system during system disturbances and fast solar irradiation changes confirm that the proposed control algorithm for single-stage PV inverters can provide appropriate real and reactive power services and ensure PV DC voltage stability during dynamic system operation and atmospheric conditions.
Keywords Algorithms
Control systems
Electric power
Interconnected power systems
Photovoltaic power supplies
Solar energy
Voltage drop

Source Agency Technical Information Center Oak Ridge Tennessee
NTIS Subject Category 97N - Solar Energy
97E - Electric Power Transmission
Corporate Author Oak Ridge National Lab., TN.
Document Type Technical report
Title Note N/A
NTIS Issue Number 1326
Contract Number DE-AC05-00OR22725

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