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A grid-connected inverter is equipped with an LCL filter after its output. This filter has a resonant characteristic and many active damping methods have been researched to suppress the resonant effects. The inverter is often controlled digitally and there is a control time delay which is inevitable due to A/D conversion, computation times, and so on. This delay degrades stabilities and damping effects...
A stability analysis method for parallel connected inverters to a grid system is investigated to analyze their stability behaviors. Basically frequency characteristics of the system impedance divided by the inverter output impedance are checked to satisfy the Middlebrook criterion. First a numerical computation method for the impedance is proposed. Then grid-connected inverter examples are analyzed...
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