About Photovoltaic inverter circulating current
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6 FAQs about [Photovoltaic inverter circulating current]
How circulating current is generated in a parallel inverter?
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.
Why does circulating current flow between inverters?
The circulating current flows between the inverters when the reference voltages differ according to the dead time, imperfect symmetry in hardware, and dependent control of parallel inverters. Different zero-sequence voltages Vzsv1 and Vzsv2 are injected into each module based on the discrepancy of the reference voltages from Eq. (10).
How to provide voltage support in PV inverter?
To provide voltage support at the PCC, reactive power is injected into the grid under fault conditions as per the specified grid codes. As previously discussed, the simultaneous injection of peak active power from PVs and reactive power into the grid for voltage support can trigger the over current protection mechanism in PV inverter.
How do inverter modules calculate circulating current?
The individual inverter module can calculate the circulating current using the three-phase output current of each inverter module, and the amplitude is proportional to the phase difference of the carriers. Therefore, the instant phase difference of the carriers can be estimated using the circulating current.
Do modular inverters have a closed circuit?
Modular inverters have a closed circuit when each inverter shares the common DC source and AC bus. The circulating current is generated by differences in each inverter, such as hardware parameters and control process.
How does circulating current affect the power rating of a parallel inverter?
The circulating current deteriorates the output current quality and degrades the reliability of the parallel system [12, 13, 14, 15]. Harmonic components of circulating current can influence the inverter life cycle, limiting the power rating of the total parallel-connected inverter [16, 17].
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