An Enhanced Transfer Delay Frequency Locked Loop Method For Single Phase Grid Voltage Synchronization
2019 IEEE 10TH INTERNATIONAL SYMPOSIUM ON POWER ELECTRONICS FOR DISTRIBUTED GENERATION SYSTEMS (PEDG 2019)(2019)
摘要
In this paper, an enhanced transfer-delay frequency-locked loop (ETD-FLL) is proposed to achieve grid synchronization for single-phase grids. Applying two transferdelay units, a mathematic model is established to describe the integrated grid voltage in a linear regression form. Based on the proposed model, the ETD-FLL is proposed to estimate the frequency and phase angle. The proposed method has fast dynamics due to its TD-based structure. In addition, the usage of the integrator enhances the harmonic immunity of the proposed method. Finally, the experimental results show that the proposed ETD-FLL has good performance in terms of dynamics and harmonic immunity.
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关键词
Single-phase grid voltage, frequency locked loop, normalized gradient algorithm, frequency estimation, grid synchronization
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