Distributed Impedance Injection Modules for Power Grid Stability
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Solution Overview
Problem
The high-voltage power grid faces challenges in balancing lines and responding to disturbances due to the integration of new distributed generation systems and loads, leading to issues like small signal stability, power oscillations, and sub-synchronous resonance, which require faster and more localized control capabilities to maintain operational stability.
Innovation Solution
The implementation of self-aware distributed impedance injection modules (DIIMs) with high-speed communication capabilities, local intelligence centers (LINCs), and FACTS-based control devices, enabling sub-cyclic response and coordinated control across the power system to address disturbances and fluctuations, integrating energy storage and demand response units for enhanced stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If traditional EMS and SCADA control systems are used to control HV power grid, then centralized monitoring and control is achieved, but the response speed to disturbances is slow and localized control capability is insufficient
Solution Approach 1:
The patent segments the centralized control function into distributed local control units (LCUs) that are deployed at various points along the HV power transmission lines. Each LCU independently monitors local conditions and executes control actions, eliminating the need for all decisions to traverse through centralized EMS/SCADA systems. This segmentation enables sub-cyclic response speeds while maintaining overall system coordination.
Solution Approach 2:
The patent introduces a new hierarchical dimension to the control architecture by adding local control units between the traditional centralized control layer and the physical power flow layer. This creates a multi-layered control structure where fast local decisions handle immediate disturbances, while slower centralized coordination manages overall system optimization, effectively adding a temporal and spatial dimension to control responsiveness.
2Adaptability or versatility
If distributed generation systems are integrated into the power grid, then renewable energy penetration increases, but line balancing capability deteriorates and stability issues arise
Solution Approach 1:
The patent implements local control units with specialized intelligence tailored to specific grid segments experiencing distributed generation integration issues. Each LCU is equipped with algorithms specifically designed to handle local line balancing, voltage regulation, and stability maintenance, allowing customized responses to different types of distributed generation connections rather than applying uniform centralized control rules.
Solution Approach 2:
The patent establishes continuous feedback loops between local control units and the power flow conditions they monitor. LCUs receive real-time measurements of line currents, voltages, and power flows, and automatically adjust control actions to maintain stability. This distributed feedback mechanism enables rapid correction of instability caused by distributed generation without waiting for centralized system responses.
3Reliability
If self-aware distributed impedance injection modules are deployed on HV transmission lines, then localized line balancing and disturbance response capability improve, but system complexity and communication requirements increase
Solution Approach 1:
The patent designs local control units as universal devices that can perform multiple functions including impedance injection, power flow control, voltage regulation, and disturbance mitigation. By consolidating these diverse control capabilities into single multi-functional LCUs deployed along transmission lines, the system achieves high reliability without proportionally increasing device complexity, as each unit serves several critical functions simultaneously.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution provides a standardized, high-reliability, and dynamic control capability that enables the power system to respond quickly to disturbances, maintaining stability and optimizing power flow from generation to distribution, reducing the risk of power delivery issues and brownouts.
Implementation Method 1
inject an appropriate inductive or capacitive impedance (alternately inject an equivalent voltage component) on to the line to locally balance the lines for power transfer
Implementation Method 2
integrating energy storage and demand response units for enhanced stability
Data Source
AI summary
A system architecture and method for enabling hierarchical intelligent control with appropriate-speed communication and coordination of control using intelligent distributed impedance/voltage injection modules, local intelligence centers, other actuator devices and miscellaneous FACTS coupled actuator devices is disclosed. Information transfer to a supervisory utility control is enabled for responding to integral power system disturbances, system modelling and optimization. By extending the control and communication capability to the edge of the HV power grid, control of the distribution network through FACTS based Demand response units is also enabled. Hence an integrated and hierarchical total power system control is established with distributed impedance/voltage injection modules, local intelligence centers, connected other actuator devices, miscellaneous FACTS coupled devices and utility supervisory all networked at appropriate speeds allowing optimization of the total power system from generation to distribution.