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Removing the isolation transformer in grid-connected photovoltaic (PV) inverters is desirable to increase efficiency and reduce the size, weight, and cost of these systems. However, it may also allow leakage current through the stray capacitance between the PV array and ground, causing a safety risk. Both efficiency and leakage current depend upon both inverter topology and modulation strategy. In...
Disturbances from the utility grid including voltage sags, harmonics and the grid impedance will affect the LCL-filter-based grid-connected inverter's connecting to the grid. In this paper, a repetitive-based controller with dual close-loop and feedforward for a single-phase system is proposed. In the method, dual close-loop control with feedforward can limit the resonance peak of the LCL filter and...
In this paper, a new control scheme of a proportional resonant (PR) + harmonic compensation (HC) combined with inductor current state feedback and load current feed-forward for an Active Voltage Quality Regulator is proposed. The inductor current state feedback is used to enhance the stability and increase the damping factor to eliminate the resonant peak of output LC filter. The load current feed...
The customer awareness of power quality problems in power distribution systems has increased these years. In practice, lots of power quality problems were fond in a mobilephone telecom station supplied by a rural utility end, which caused severe damages to the major equipment inside the mobilephone station building, including the off-the-line switching mode power supply for the telecom equipment and...
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