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A New Synchronization Algorithm for Grid-Connected Inverters |
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PP: 869-875 |
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Author(s) |
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Xiaorui Guo,
Jifeng Guo,
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Abstract |
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| Synchronization algorithms are of great importance in control of grid-connected inverters as an integral part of distributed
power generation units such as photovoltaic systems. A new all-digital closed-loop phase-locked algorithm for the synchronization
signals of three-phase grid-connected inverters is presented even considering seriously distorted and variable-frequency utility
conditions. The proposed synchronization algorithm can suppress the negative sequence utility voltage at fundamental frequency and
high-frequency harmonic components effectively, and lock the positive sequence phase at fundamental frequency accurately.Moreover,
a frequency adaptation algorithm is also proposed for applications where large frequency variations are often expected. Finally, digital
simulation and experimental results both prove the feasibility of the proposed phase-locked method. The introduced synchronization
method provides higher degree of immunity and insensitivity to harmonics and other types of pollutions in the utility when used to
synchronize inverters. |
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