I. Introduction
The power system is a fundamental economic-social infrastructure. The recent trends of Industrial Internet-of-Things (IIoT) technology have profoundly transformed the conventional power system in the last decades. In particular, the latest advances in smart grids extensively integrate the advanced information and communication technology (ICT) [1] with the conventional power system, which significantly increase the grid efficiency and reliability. However, the new ICT systems employed by smart grids as well as other IIoT networks are facing great security challenges especially under the mounting threats of cyberattacks. State estimation, which calculates the state of the power network system from the raw measurements gathered by the supervisory control and data acquisition (SCADA) system [2], plays a very essential role in the control center. In particular, compromised system state estimation may interfere the operation of power systems, since many power system applications (such as economic dispatch, contingency analysis, etc.) rely on the results of state estimation [3]. Liang et al. [4] and Deng et al. [5] presented comprehensive surveys on the impacts of cyberattacks on state estimation, e.g., line congestion [6], power outage [7], communication block [8], etc.