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Grid synchronization is an important part in the control of grid-connected power electronic converters. The fundamental phase-angle at the point of common coupling should be tracked on-line in order to control energy transfers. Digital implementation allows to implement high performance algorithms, which are robust in the presence of power quality phenomena. However, different kinds of distortion...
This paper presents a new open-loop architecture for three-phase grid synchronization based on moving average and predictive filters, where accurate measurements of phase, frequency, and amplitude are carried out in real time. Previous works establish that the fundamental positive sequence vector of a set of utility voltage/current vectors can be decoupled using Park's transformation and low-pass...
Phase locked loop (PLL) algorithms for grid synchronization are a very important part of the control in most of the grid-connected power converters applications. The performance of the PLL should not be much affected under distorted grid conditions: the presence of harmonics, unbalance, noise, etc in the inputs should not distort PLL measurements. This paper presents an optimized design approach of...
A single phase converter can be used for low-power grid connected applications. In photovoltaic applications it is possible to remove the transformer in the inverter in order to reduce losses, costs and size. Galvanic connection of the grid and the DC sources in transformerless systems can introduce additional leakage currents because of the earth parasitic capacitance. This currents increase conducted...
Multilevel voltage source inverters synthesize the AC output terminal voltage from several levels of voltages, stepped waveforms can be produced, which approach the reference waveform with low harmonic distortion, thus reducing filter requirements. The need of several sources on the DC side of the converter makes multilevel technology attractive for photovoltaic and fuel cells applications. For low-power...
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