An Improved False Data Injection Attack Scheme Considering Operational Risk of Microgrid Group

This paper establishes a false data injection attack (FDIA) model considering operation risk, which provides a reference for microgrid operators to build defense strategies. Firstly, considering the probability distribution and output characteristics of distributed generation and load in microgrid group, the microgrid operation risk index is established. Then, a FDIA optimization model aiming at maximized the operation risk value of microgrid group is established, and the measurement system is injected with false data including attack time and different tampering degrees, which is solved by particle swarm optimization(PSO) algorithm. Finally, by analyzing the system operation risk value after attacking different nodes, the attacked nodes, attack time and attack vector in the attack scheme are determined. The example analysis is carried out in the improved 30 node microgrid group. The results show that for wind power nodes with strong randomness and nodes with large load, the operation risk value of microgrid group increases significantly when FDIA is applied in the time period of large power fluctuation.

I. Introduction

As the scale of microgrids continues to expand, and multiple microgrids in the same region form microgrid group, which is conducive to improving the overall operation stability and economy of microgrid group. However, due to the increasingly high scalability and flexibility of network communication terminals, distributed controlled microgrid group is very vulnerable to cyber attacks [1], which may lead to the deviation of microgrid line power flow and voltage at a mild level, and may lead to breakdown of microgrid group at a serious level. In recent years, common cyber attacks include replay attack, false data injection attack (FDIA) and denial of service (DOS) attack. Due to its strong interference and concealment, FDIA can tamper with measurement data of measurement system, and has a direct impact on the decision of dispatching center. FDIA is a cyber attack with a high threat degree to microgrid group. Therefore, in order to strengthen the microgrd group’s defense against FDIA, it is of great practical significance to study the FDIA scheme considering the operation risk of microgrid group.