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This paper proposes optimal switching period phase-shifted method for slave inverter to reduce grid current ripples in synchronized two parallel three-phase grid-connected voltage-source inverters (VSI). In parallel operation, a 180 degree phase shifted method generally takes of advantage of reducing grid current ripples in same DC-link voltage for each grid-connected VSI. However, in case of unequal...
This paper proposes an improved discontinuous PWM (DPWM) method in a grid-connected inverter system. When the conventional 60° DPWM is used in the switching method, the output voltage of the inverter has many harmonics compared to the continuous PWM (CPWM) switching method. In large-scale system, a LCL-filter cannot sufficiency reduce the harmonics of the inverter output voltage. If these harmonics...
This paper presents an open-circuit fault detection method for a grid-connected neutral-point clamped (NPC) inverter system. Further, a fault-tolerant control method under an open-circuit fault in clamping diodes is proposed. Under the grid-connected condition, it is impossible to identify the location of a faulty switch by the conventional methods which usually use the distortion of outputs because...
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