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Instabilities due to mutual interactions among inverters in a grid system are sometimes observed. This paper proposes a stabilization method which adds feed-forward (FF) loop characteristics to improve output frequency impedance characteristics which satisfy the Nyquist stability criterion. The principle is that the output impedance is compulsively made passive with the FF loop characteristics and...
The increasing use of grid-connected inverter systems is resulting in a desire for parallel-connected inverters that offer greater power capacity while maintaining the high control bandwidth achieved by individual inverters. This paper demonstrates that, in addition to the traditional stability and bandwidth limitations of digitally controlled inverters, further stability and bandwidth limitations...
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