Accurate and fast estimation of single-phase grid voltage phase and frequency has the potential to improve the performances of various control and monitoring techniques used in electric power systems. This letter applies an adaptive sliding mode observer for frequency and phase estimation. The observer is simple, easy to tune, and suitable for real-time implementation. The proposed adaptive observer can be considered as an alternative to a phase-locked loop (PLL) with better performance. dSPACE-based experimental results are given to show the effectiveness and performance improvement of the proposed approach with respect to two other advanced PLL techniques, namely, pseudolinear enhanced PLL and second-order generalized integrator-frequency locked loop.

中文翻译：

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单相电网信号相位和频率的快速估计

准确快速地估计单相电网电压相位和频率有可能提高电力系统中使用的各种控制和监测技术的性能。这封信应用自适应滑模观测器进行频率和相位估计。观察器简单，易于调优，适合实时实现。所提出的自适应观测器可以被视为具有更好性能的锁相环 (PLL) 的替代方案。给出了基于 dSPACE 的实验结果，以显示所提出的方法相对于其他两种高级 PLL 技术的有效性和性能改进，即伪线性增强型 PLL 和二阶广义积分器频率锁定环。