A Demodulation-Based Method for Instantaneous Phase-Angle Estimation of Unbalanced Three-Phase Voltage Systems

Reza, Md. Shamim; Hossain, Maruf

doi:10.1109/jestpe.2021.3065231

Cited by 6 publications

(2 citation statements)

References 29 publications

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“…Recently, several optimizations of PLL have been attempted to address the above issues. The traditional synchronous reference frame PLL (SRF-PLL) is hard to deal with voltage harmonics and asymmetry [9]. To provide the necessary filtering capability, a moving average filter based PLL (MAF-PLL) and a notch filter based PLL (NF-PLL) are proposed [10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

A mode switching based transient ride‐through phase‐locked loop

Fan

Han

Zhang

et al. 2023

IET Power Electronics

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In the case of grid voltage quality problems, the traditional phase‐locked loop (PLL) is hard to detect the accurate grid frequency and phase during the transient response, which will be detrimental to the transient synchronous stability of grid‐connected inverters. This paper proposes a mode switching based transient ride‐through PLL (TRT‐PLL), aiming to improve the transient phase‐locking performance through detection technique and mode switching. The TRT‐PLL incorporates a hybrid filter (HF), a dual‐speed detection module, and a state switch into the traditional synchronous reference frame PLL (SRF‐PLL) structure. The theoretical analysis and paradigm design of TRT‐PLL is presented in detail. Digital simulations and physical experiments are carried out for the comparisons with other existed PLL techniques. The results demonstrate that the satisfied transient performance of the TRT‐PLL has significant advantages, especially in the event of phase jumps.

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Section: Introductionmentioning

confidence: 99%

A mode switching based transient ride‐through phase‐locked loop

Fan

Han

Zhang

et al. 2023

IET Power Electronics

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“…Among them, fast and accurate amplitude-phase detection is the basis for the subsequent works [4], and is crucial for highperformance control of converters [5], [6]. Indeed, with the wide application of converters, the grid code requires grid-tied converters to equip with fault ride-through capabilities [7]- [9], making it necessary to study effective amplitude-phase detection methods when considering DDC components associated with large grid X/R ratios.…”

Section: Introductionmentioning

confidence: 99%

Amplitude-Phase Detection for Power Converters Tied to Unbalanced Grids with Large X/R Ratios

Xiong

Liu

et al. 2021

IEEE Trans. Power Electron.

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Amplitude-phase information of the voltage/current phasor, which is the prerequisite for grid-tied converter control and protection, can change almost instantaneously in lowvoltage distribution systems with small X/R ratios. However, the equivalent impedances of high-voltage power systems are usually inductive (with large X/R ratios), and the power flow of pertinent grids generates decaying DC (DDC) components with large amplitude and long duration during large disturbances. Therefore, the X/R ratios and DDC components must be fully considered in amplitude-phase detection to achieve effective converter control and protection. To this end, the main components present in the transient voltage/current of a high-voltage power system after unbalanced disturbance are first analyzed, and the general transient model is obtained by synthesizing multi-mode DDC components. Then, by resorting to waveform characteristics of different components, an amplitude-phase detection algorithm is proposed based on the multi-component parallel-detection structure. Compared to existing techniques, the detection time is reduced to half grid cycle. Finally, an iterative variable-interval integral algorithm is developed, improving the anti-noise ability of detection algorithm, and overcoming the computational burden issue. This enables the direct integration of algorithm into the converter's embedded processor. Experiment results verified the effectiveness and superiority of the proposed technique.

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