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This paper presents an SPWM-based division-summation (D-Σ) digital control for paralleled three-phase grid-connected inverters. The proposed D-Σ control approach derives the plant, and then obtains the control gains or duty-ratio control laws to cancel the variation effects of dc voltage, switching period and inductance. With the D-Σ digital control, each inverter can track sinusoidal reference current...
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