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In this paper, a current controller based on equivalent-input-disturbance (EID) approach for the grid-connected single-phase photovoltaic inverter in microgrid is proposed. First, a signal generator is employed to generate the amplitude and the phase of reference current. The amplitude is calculated according to the data obtained from experiment devices, while the phase is regulated by a phase-locked...
One problem with a single-voltage source, three-level inverter is the drafting of its neutral-point voltage. This may occur during transition or when unbalanced loads are connected to the inverter system. Variation of neutral-point voltage may greatly deteriorate the power quality. In this paper, we employ an equivalent-input-disturbance approach to deal with this problem. By adding an extra neutral...
Installation of the photovoltaic power system on the roof of houses is increasing rapidly. The photovoltaic power system has two typical problems, one is large power output change depending on climate change, and the other is over voltage in distribution line due to reverse power flow. These problems will be remarkable subjects for large amount of installation of photovoltaic power system in near...
This paper presents an application of a two-dimensional continuous/discrete model based repetitive control method in voltage control of DC/AC inverters. The control objective is to suppress harmonic distortion, ensure high quality sinusoidal voltage output. Total harmonic distortion(THD) is one of the main criteria to evaluate power quality, it should be kept as small as possible. Modeling of the...
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