Mitigating zero dynamic attack in communication link‐enabled droop‐controlled hybrid AC/DC microgrids

Abstract

This article focuses on mitigation of zero dynamic attack in communication link-enabled droop-controlled hybrid AC/DC microgrids (MGs). To transmit setpoints for droop controllers and to also send measured AC and DC voltages and AC frequency in this sort of MGs, a communication link is required. Such links are exposed to cyber-attacks. First of all, this article tries to indicate that the system would be vulnerable to zero dynamic attack. In the second step, it is shown that zero dynamic attack can be mitigated by closing the secondary control loop. It is also shown that the attack can be distinguished from load/generation disturbances. In order to proceed with the challenge, the control signal in a closed loop system is used as the tricks of the trade. To achieve the goal, parity space as a kind of model-based fault detection approach is applied to a recently proposed dynamic model for droop-controlled hybrid AC/DC MGs. Evaluation of the detecting approach confirms that not only it can detect the attack effectively, but also it distinguishes from disturbance perfectly.