Detection technique for power system under cyber attack

In order to maintain the security and reliability of smart grid, more efficient operations of relays are required. In this paper, an innovative scheme has been introduced to distinguish the fault and power swing condition, which arise due to change of heavy load and cyber-attack. Microprocessor based relays are proposed to control circuit breakers command signal in case of power swing and fault. A Magnitude-Derivative check algorithm(M-DC) for microprocessors based relays is presented to discriminate faults and power swings condition on the basis of the rate of change of current and reactive power. To make the microprocessor relays more reliable, an efficient scheme is proposed, in which attack detector monitors the command signal of microprocessor relays and determines whenever, adversary tries to manipulate the command signal.

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