Energy and environmental problems are two challenges today and production and use of recycled energy is the focus of world attention. More and more attention is being drawn to more reliable solar power generating systems, and more than 50GW solar power generating capacity is being constructed in the world every year.
At present, there are two widely-used types of solar power systems—central or distributed. The main problems in the construction of distributed solar power systems are to guarantee flexibility of distributed power sources, stability of voltage and frequency of the weak grids, optimized management and distribution of electric systems and improvement of electric power quality.
O Yong Nam, a section head at the Faculty of Physical Engineering, has designed a novel phase synchronization method for distributed power systems by combining good harmonic and DC offset cancellation characteristics of the discrete Fourier transform (DFT) and frequency adaptation characteristics of phase locked loop (PLL). The validation of the suggested method has been simulated with Microsoft Excel and MATLAB Simulink software.
The proposed method has shown to be effective for grid voltage signal synchronization in non-ideal grid conditions with frequency variation and harmonic distortion and for reference signal synchronization in multi-inverter standalone systems. Also, it is not sensitive to the DC offset in the measurement process.
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