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Synchronization instability issue and the corresponding low-frequency power oscillation phenomenon between synchronous generators were already found in electric power systems and addressed by various solutions. However, the grid-synchronization behaviors and the potential instabilities between multi-paralleled power electronic inverters have not been well-understood due to the different synchronization...
More attention to the electromagnetic interference (EMI) issues arises in grid-interface converter system where the radio frequency (RF) conducted emissions have to be considered on both dc and ac-side, such as in the application of photovoltaic (PV) system, dc distribution system, and charging system in electric vehicles (EVs). This paper presents a brief overview of the recent EMI research activities...
This paper presents a state-feedback model to predict the frequency behavior of the grid-interface converter which uses phase-locked loop (PLL) techniques to synchronize with the grid. The frequency positive-feedback mechanism in the converter system is proposed and quantified in the model. The nonlinear behavior of the PLL under the weak grid condition can be accurately predicted and the large-signal...
This paper presents a novel anti-islanding (AI) detection algorithm for three-phase (3Φ) grid-interface converters in distributed generation systems. A generic phase-locked loop (PLL) model by considering the converter interaction with grid is proposed. And the frequency positive-feedback mechanism is proposed to predict the frequency behavior of the grid-interface converter system, especially under...
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