Power distribution network integrated protection method suitable for access of distributed power supplies
A technology of distributed power supply and distribution network, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve the problems of non-compliance and high cost, achieve strong practicability, reduce the impact of short-circuit distribution network, and avoid large-scale transformation Effect
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[0042] 1. If figure 1 As shown, when the end of the line BC is faulty, the access of the distributed power source reduces the fault current detected by the upstream line current protection A; and increases the fault current detected by the downstream line current protection B. At this time, in the two situations before and after the distributed power supply is connected, it is still necessary to ensure that the current protection can operate reliably. According to the power grid structure of the local distribution network, combined with the access of distributed power, two sets of fixed values are calculated respectively: one set is not connected to the inverter-type distributed power (DG), and the network equivalent value is used The system parameters are obtained by the simple method, and the protection setting value obtained by using the conventional distribution network stage current protection setting method; the other group is the current protection of the distribution...
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