About How to avoid circulating current in photovoltaic inverters
generated circulating current. The circulating current is a function of the generated common-mode voltages of the parallel inverters and can be minimized by synchronizing the inverters. The synchronization has previously been achieved by a communication link. However, in photovoltaic systems the inverters may be located far apart from each other.
generated circulating current. The circulating current is a function of the generated common-mode voltages of the parallel inverters and can be minimized by synchronizing the inverters. The synchronization has previously been achieved by a communication link. However, in photovoltaic systems the inverters may be located far apart from each other.
To regulate extremely tightly and restrict the circulating current among inverters in a microgrid, requires a very strong control over the amplitude and frequency of the output voltage. This circulating current is caused by initial voltage variations across inverters connected to the same DC bus and the same load [ 8 , 9 ].
The circulating current is generated when the parallel inverters operate with an interleaving scheme to improve the quality of the output current. The isolated transformers to the ac sides can mitigate the circulating current by eliminating the closed current path.
In order to avoid the activation of over voltage protection device, which may disconnect the inverter from the grid, the PV should stop operating at its MPP and the PV power must be.
Aiming at the zero sequence circulating current problem of multi machine photovoltaic grid connected inverter, a repetitive control strategy is proposed. Firstly, based on the analysis of the circulating current model of the inverter parallel system, a controller combining the improved repetitive control of circulating current and PI control is .
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