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For the harmonic resonance problem of the photovoltaic multi-inverter parallel grid-connected system, this paper mainly analyzes the resonant characteristics of the LCL interface circuit. The model of the LCL interface circuit is given, and with the increase of grid-connected inverter number, the resonant characteristics are analyzed respectively which the circuit system is stimulated by the harmonic...
In order to develop a practicable extended interaction klystron (EIK) at 0.34 THz, the potential inaccuracy in fabrication process is studied. The influences of tolerance on electric field distribution, ß-value, resonance frequency and impedance are discussed, leading to the acceptable tolerance. Finally the tolerance within 10 um in fabricating the structure of gap is demonstrated acceptable with...
The photovoltaic grid-connected power system filter interface circuit analysis and optimization design is the important measure to improve the system stability and grid power quality. This paper analyzes the three-phase LCL filter interface circuit model respectively on ABC coordinates and αβ coordinates. The frequency characteristic of L, LC, LCL three kinds of filter carries out comparative analysis...
This paper studies the inherent damping of digitally controlled LCL-filtered voltage source inverters (VSIs) that adopt single-loop inverter-current feedback (ICF) or grid-current feedback (GCF), through investigating the virtual impedance introduced by each feedback control method. The virtual impedance consists of resistance and reactance which are found to be delay-dependent. The virtual resistor...
This paper compares three current control methods for LCL-filtered grid-connected inverters, they are single-loop control based on inverter current feedback, that based on grid current feedback, and dual-loop control with capacitor current feedback active damping. The virtual impedance introduced by each method is identified, which comprises frequency-dependent resistance and reactance. The reactance...
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