Distributed photovoltaic effect on distribution network protection

Typically by up to and including 35 kv voltage grade feeder access, when the capacity than large enough, will affect the distribution of short-circuit current, and thus affect the protection setting and matching principle. Distributed photovoltaic power generation on distribution network protection

normally, it through below 35 kv voltage grade feeder connections. When both capacity than is large enough, can affect the distribution of short-circuit current, and thus affect the protection setting and matching principle. Distributed photovoltaic effect on distribution network protection is mainly manifested in six aspects: ( 1) If distributed photovoltaic access feeder fails, the upstream downstream of feeder protection device failure may occur; ( 2) If the malfunction of the adjacent feeder feeder protection misoperation may occur; ( 3) The connection of distributed photovoltaic power generation and distribution network will affect the feeder protection sensitivity. Once in sensitivity to change, will lead to wrong operation or rejected. ( 4) The protection range of the feeder itself has certain. Will be distributed photovoltaic power distribution network will affect the protection range of the feeder and make it change; ( 5) Distributed photovoltaic power low voltage busbar substation, power distribution network feeder in the sensitivity of current protection would improve greatly. This is because the connection to the low voltage bus bar, after system short circuit capacity increases, the corresponding short-circuit current will increase, the sensitivity will increase accordingly; ( 6) Once distributed photovoltaic power generation is connected to the distribution network, once the volume increases, may lead to a selective loss of distribution system protection.