HVDC Security Logic Unit for Emergency Power Control
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Solution Overview
Problem
High voltage direct current (HVDC) transmission systems face potential cyber security issues due to unauthorized control attacks that can initiate emergency power control actions, leading to severe network dynamics and power flow violations, causing cascading outages or transient instability.
Innovation Solution
Incorporating a security logic unit in the converter controller to receive status data of the power system, determine the consistency of emergency power control commands with the current system state, and block inconsistent commands to prevent unauthorized execution, thereby ensuring secure emergency power control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If emergency power control commands are allowed to be executed based on remote triggers, then grid response speed and emergency control capability are improved, but system security and stability deteriorate due to potential unauthorized attacks
Solution Approach 1:
The patent introduces a security logic unit as an intermediary component between the remote emergency power control trigger and the HVDC transmission system. This unit verifies the consistency of emergency power control commands with the actual system state before execution, blocking unauthorized commands while allowing legitimate emergency responses. The security logic unit acts as a mediator that filters commands based on real-time system status verification.
Solution Approach 2:
The patent implements a feedback mechanism where the security logic unit continuously monitors system status data and compares it with the received emergency power control commands. The unit determines consistency between commands and actual system state, creating a closed-loop verification process that provides feedback on command legitimacy before execution, thereby preventing unauthorized control actions.
2Reliability
If remote emergency power control is implemented, then grid stability control capability is improved, but vulnerability to cyber attacks increases
Solution Approach 1:
The patent applies preliminary anti-action by implementing a preventive verification mechanism before emergency power control commands are executed. The security logic unit proactively checks whether received commands are consistent with the actual system state, blocking potentially harmful unauthorized commands before they can cause damage. This preliminary verification counteracts the vulnerability to cyber attacks while maintaining grid stability control capability.
3Reliability
If fast power control capability is used for emergency power control, then transient stability improvement is achieved, but risk of cascading outages increases due to unauthorized commands
Solution Approach 1:
The security logic unit serves as an intermediary that verifies the legitimacy of fast power control commands before they are executed by the HVDC transmission system. By checking consistency between commands and actual system state, the unit prevents unauthorized fast power control actions that could trigger cascading outages, while still allowing legitimate emergency control actions to improve transient stability.
Data Source
AI summary
Technologies for providing secure emergency power control of a high voltage direct current transmission (HVDC) system include a controller. The controller includes circuitry configured to receive status data indicative of a present physical status of a power system. The circuitry is also configured to obtain an emergency power control command triggered by a remote source. The emergency power control command is to be executed by an HVDC transmission system of the power system. Further, the circuitry is configured to determine, as a function of the status data, whether the emergency power control command is consistent with the present physical status of the power system and block, in response to a determination that the emergency power control command is not consistent with the present physical status of the power system, execution of the emergency power control command by the HVDC transmission system.