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The Preisach model weighting function is given by partial derivations of a measured magnetic flux density that leads to high errors. Therefore other methods of the weighing function estimation are used frequently. In order to verify the direct approach the extended experiment was made and data were numerically processed to reduce known errors. It results in model of the hysteresis loop usable in a...
The synchronous reference frame phase-locked loop (SRF-PLL) is widely used for synchronization applications. However, it suffers from a poor performance under unbalanced and distorted grid conditions. To improve the filtering capability of SRF-PLL, moving average filter (MAF) is incorporated into its control loop at the cost of a slow transient response of PLL in recently published literature. To...
This paper proposes a novel three-phase phase-locked loop (PLL) algorithm, which focuses on the reforming of the primary signals before grid synchronization rather than improving the phase estimation methodologies. The unbalanced signals are reformed to balanced ones without damage to the phase angle, through which the negative sequence of the grid voltages is removed. This eliminates the estimation...
This paper mainly studies the PLL algorithms for TCSC, expecting the PLLs to achieve the following performances: rapidly and accurately tracking line current phase and frequency, effectively suppressing sub-harmonics and harmonics, robustness to the disturbances and other types of pollutions. The paper first describes the concept of PLL. Then on the basis of the comparison among several kinds of single-phase...
This paper presents a modified three-phase phase locked loop, consisting of a multi-block adaptive notch filter (ANF) integrated into a conventional three-phase synchronous reference frame phase-locked loop (SRFPLL). The addition of the ANF to the system allows it to become frequency adaptive. Also, since the ANF consists of multiple blocks which are in parallel with one another, the system is able...
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