Abstract

Considering the unique fault detection requirements of smart distribution grid, a distributed regional protection system is proposed. The distributed generations (DGs), which are widely installed in smart distribution grid, are considered to impact the power system protection performance, especially the operation of overcurrent relays that are widely used in traditional distribution grid. This chapter revises the principle of overcurrent protection that can reflect the phase-to-phase fault of next line. Then, the smart distributed terminal unit (SDTU) can use the overcurrent information and direction information to judge the fault to be at upstream or downstream. With protection-associated areas known, SDTU can exchange information with forward associated area to complete the fault isolation function. The algorithm has high selectivity and reliability through simulation verification.

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