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Performance of grid-connected converter relies on fast and precise estimation of phase angle and amplitude of the fundamental component of grid voltage signal to guarantee the proper synchronization of DG in modern power systems. However, the extent to which the frequency is estimated is dependent on the type of grid voltage abnormalities and structure of the phase-locked loop or frequency locked...
Grid synchronization has always been an important challenge for three-phase grid-connected converters under unbalanced and distorted grid conditions. Moreover, how to quickly and accurately extract multiple harmonic sequence information is essential for control systems. In this paper, a three-phase multiple harmonic sequence detection method is proposed for estimating both the fundamental and harmonic...
Grid synchronization has always been a great challenge for single-phase gird-connected converters since only one signal is provided and it is beneficial for the control system if grid information is obtained rapidly and accurately. In this paper, a novel quadrature signal generation algorithm and a phase-locked loop based on it are proposed and analyzed. The proposed algorithm functions as two finite...
Synchronous reference frame phase-locked loop (SRF PLL) is extensively employed for grid converter synchronization applications. When the input contains the fundamental positive sequence (FPS) component alone, it performs exceedingly well. However, with harmonic contamination and unbalance in the input, its performance degrades. For this purpose, many structural modifications are proposed. In this...
This paper presents a phase-locked loop (PLL) method aimed to provide an estimation of the phase angle and the amplitude of the fundamental positive sequence component of a three-phase reference signal subject to severe unbalance and high harmonic distortion. In addition the proposed scheme provides the estimation of the angular frequency, and both the positive and negative sequences of the fundamental...
Renewable energy sources require accurate and appropriate performance not only under normal grid operation but also under abnormal and faulty grid conditions according to the modern grid codes. This paper proposes a novel phase-locked loop algorithm (MSHDC-PLL), which can enable the fast and dynamic synchronization of the interconnected renewable energy system under unbalanced grid faults and under...
This paper presents a new PLL structure for single-phase grid-connected systems. Its peculiarity consists in the presence of an orthogonal signal generator, not dependent on the frequency of the input grid voltage and realized by simple and low-cost analog and digital devices. The paper gives a detailed description of the proposed PLL structure, also dealing with the appropriate design of the analog...
This paper briefly reviews the synchronization techniques for single-phase converter-interfaced distributed generation (DG) systems. These techniques are compared in terms of their capability in tracking frequency variations, and the phase angle of the grid signal in the presence of low order harmonic. The techniques introduced in this paper are applicable for a wide range of equipment like converter-interfaced...
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