A Robust Method to Secure Multi-Inverter Grid Tied PV and Battery Energy Storage Systems Against Cyber Intrusions

Conference · Sun Oct 29 04:00:00 EDT 2023 · 2023 IEEE Energy Conversion Congress and Exposition (ECCE)

DOI:https://doi.org/10.1109/ecce53617.2023.10362166· OSTI ID:2427415

Ibrahim, Hasan; Kim, Jaewon; Wang, Shaozhe; Enjeti, Prasad

This paper details a robust method to secure a multi-inverter grid tied system that interfaces photovoltaic (PV) and battery energy storage against potential cyber-attacks. The method can be applied to any third-party inverter systems without a need to modify their internal controls. A small random private excitation signal termed "watermark" is injected into the DC input voltage terminals (via a series transformer) connected to the PV/battery inverter system. An external robust cyber intrusion detector (CID) hardware consisting of a digital signal processor (DSP) generates the "watermark" and also receives the sensor signals that control the setpoints of the PV/battery grid tied system. The CID algorithm is shown to detect all possible cyber intrusions (such as false data injection(FDI)) on external sensor signals such as P and Q measured by a smart meter that control the overall system operation. The proposed CID computes online system ID and two variance tests in real time on each sensor signal and is able pinpoint intrusion location in a multi-inverter system. Results on a hardware in the loop (HIL) of a two-inverter grid connected system demonstrate effectiveness of the proposed CID system for FDI and unobservable FDI. Test results on a laboratory prototype will be discussed in the conference presentation.

• Research Organization: Texas A&M Engineering Experiment Station
• Sponsoring Organization: USDOE
• DOE Contract Number: EE0009031
• OSTI ID: 2427415
• Conference Information: Journal Name: 2023 IEEE Energy Conversion Congress and Exposition (ECCE)
• Country of Publication: United States
• Language: English