Defence against data loss in PMU-measured power system

The construction of information support system for power grid has tightened the connection of cyber and physical space in the grid. While bringing benefits for automation and controllability, it also introduces higher risks of cyber-attacks. In this paper, a method of observability analysis and state estimation for PMU-measured power system is described, and an index of measurement redundancy degree considering critical measurements is designed. To protect the system against loss of measurements due to natural cause and malicious attack, a two-player zero-sum game theory model is built, using the redundancy degree index as payoffs for both sides. A case study is performed to validate the state estimation and observability analysis method, and best defense strategies are achieved in different data loss scenarios.