HV Line Impedance Module Communication Under Corona Interference
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Solution Overview
Problem
Distributed intelligent impedance injection modules (IIMs) operating on high voltage power grids face challenges in establishing secure and efficient communication with substations and central utilities, particularly due to high voltage and corona discharge interference, which can impact their ability to respond effectively to power flow and disturbance issues.
Innovation Solution
The implementation of a method using a local synchronizable clock capability and secure communication protocols, such as HMAC-SHA-256 key exchange, to establish secure connections between IIMs and local intelligent centers (LINC), enabling sub-cyclic speed communication while resisting unauthorized access and corona interference, utilizing specific frequencies like 915 MHz and 2.4 GHz, and antenna designs to minimize corona discharge effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If IIMs are distributed on HV transmission lines for local power flow control, then response speed to local disturbances is improved, but communication security and reliability deteriorate due to high voltage and corona discharge interference
Solution Approach 1:
The patent introduces an intermediary communication system that bridges the IIMs on HV lines with the control center. This intermediary system uses specific frequency bands (915 MHz, 2.4 GHz) and modulation techniques to transmit control signals and data through the harsh electromagnetic environment, thereby maintaining reliable communication while enabling fast local response capability.
Solution Approach 2:
The patent employs parameter changes in the communication signals, including frequency selection (915 MHz, 2.4 GHz), modulation schemes, and encoding methods, to adapt the communication system to the high voltage environment. These parameter adjustments enable the system to maintain signal integrity and security despite corona discharge and electromagnetic interference.
2Reliability
If secure communication protocols are implemented between IIMs and LINC, then communication security is improved, but system complexity increases due to authentication and key exchange mechanisms
Solution Approach 1:
The patent implements preliminary authentication and key exchange between IIMs and LINC before actual power flow control operations. The HMAC-SHA-256 key exchange and mutual verification of identities are performed in advance, establishing secure communication channels that simplify subsequent control operations while maintaining high security standards.
3Productivity
If sub-cyclic speed communication is established for fast response, then productivity in disturbance response is improved, but susceptibility to unauthorized access increases
Solution Approach 1:
The patent uses an intermediary secure communication layer that mediates between the fast sub-cyclic control requirements and security concerns. This intermediary system implements encrypted communication channels and authentication protocols that protect against unauthorized access while maintaining the high-speed response capability needed for rapid disturbance mitigation.
Data Source
AI summary
Intelligent impedance injection modules (IIM)s are currently being used for line balancing and overcoming local disturbances on High Voltage (HV) transmission lines of an HV power grid. These distributed IIMs are connected and/or coupled to the HV transmission lines and operate with a pseudo ground at the voltage of the HV transmission line. In order to operate effectively, the IIMs need to communicate with other distributed IIMs across the three phases of the HV grid and also communicate with local intelligent centers LINCs that connect to and synchronize operations across each group of the distributed IIMs in a local region of the HV power grid. Systems and methods are presented for effective and secure sub-cyclic speed communication to and from the distributed IIMs, distributed IIMs to LINCs and substations to enable coordinated actions. Further the distributed IIMs and LINCs receive GPS signals and use the GPS clock for synchronizing operations.