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Calculation of Maximum Distributed Photovoltaic Access Capacity Considering Protection Operation Characteristics

The access of distributed photovoltaics (PVs) to the distribution network affects the original current quick-break protection, resulting in the change of protection range and an increase in the risk of protection malfunction. This study analyzes the influence of the current increase caused by distributed PVs on the current quick-break protection of the distribution network, takes into account the different power factors of distributed PVs during the fault, and propose a calculation method for the maximum access capacity of distributed PVs on the premise that distributed PV access does not cause the malfunction of downstream current quick-break protection. The test results confirm the effectiveness of the proposed method for calculating the maximum access capacity of distributed PVs, which can prevent the malfunction of current quick-break protection caused by distributed PV access to the distribution network.