Publication Date:
2018-08-09
Description:
In the new energy grid connected power generation system, accurately extracting the grid synchronization signals such as frequency, phase and amplitude of the grid voltage is the basis for effective control. A new design method of phase-locked loop (PLL) in static coordinate system is proposed for the demand of synchronous signal detection under unbalanced and harmonic conditions. This method uses the resonator to extract and filter the high frequency harmonics in the grid voltage, and combines the adaptive trap (ANF) and the positive and negative sequence elimination loop (PNSC) to complete the voltage positive and negative sequence separation, and then accurately extracts the synchronous information of the positive sequence voltage of the power grid. The simulation and experimental results show that under the conditions of unbalanced and harmonic grid, the designed PLL can quickly and accurately lock the property of the grid voltage, and has the advantages of high detection pr...
Print ISSN:
1757-8981
Electronic ISSN:
1757-899X
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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