Estimating the amplitude of the grid voltage is important for low-voltage ride-through (LVRT) operation in single-phase systems. It requires fast dynamics and is typically achieved through a phase-locked loop (PLL). This paper proposes a fast amplitude estimation (FAE) method without a PLL structure. The grid voltage is formulated as a vector sum of sine and cosine functions, resulting in an algebraic model with two unknown parameters. The proposed FAE identifies the two parameters, and thus achieving a fast fault detection (i.e., the amplitude estimation). Experimental results verify the performance of the proposed method in terms of fast dynamics.
- Amplitude estimation
- voltage sags
- low-voltage ride-through (LVRT)
- parameter identification
- single-phase systems
- grid synchronization
Zhang, J., Zhao, P., Zhang, Z., Yang, Y., Blaabjerg, F., & Dai, Z. (2020). Fast amplitude estimation for Low-Voltage Ride-Through Operation of Single-Phase Systems. IEEE Access, 8, 8477-8484. . https://doi.org/10.1109/ACCESS.2019.2963226