Distributed Control Nodes for Grid Harmonic Management
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Solution Overview
Problem
Traditional utility power grids face challenges in managing peak demand, reactive power instability, and grid voltage control due to the integration of renewable energy sources and increased use of air conditioning units, leading to issues like rolling brownouts and blackouts, and require significant infrastructure and centralized management.
Innovation Solution
A distributed power grid control system with hierarchical control nodes that monitor and manage power generation and consumption at points of common coupling, adjusting real and reactive power to maintain grid stability and compliance with regulations, using converters and metering devices to control harmonic distortion and noise contribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If traditional centralized grid infrastructure is used to manage peak demand, then power delivery capability is improved, but infrastructure cost and complexity increase
Solution Approach 1:
The patent divides the centralized grid into distributed control nodes that operate autonomously at local levels. Each control node manages a specific segment of the grid, making decisions about power flow and load management independently. This segmentation reduces the complexity of centralized infrastructure while maintaining overall power delivery capability through coordinated local actions.
2Adaptability or versatility
If more renewable energy sources are integrated into the grid, then energy sustainability is improved, but grid stability deteriorates due to reactive power instability
Solution Approach 1:
The patent implements feedback mechanisms at each distributed control node that continuously monitor reactive power conditions and adjust local power flow accordingly. This real-time feedback allows the system to maintain grid stability by compensating for fluctuations introduced by renewable energy sources, enabling higher integration levels without sacrificing reliability.
3Power
If motorized equipment is used to control voltage levels at substations, then voltage regulation is improved, but power factor degradation increases
Solution Approach 1:
The patent replaces mechanical voltage control devices with electronic power conversion systems at distributed control nodes. These electronic systems regulate voltage through semiconductor-based power electronics rather than mechanical switches, achieving voltage regulation while maintaining or improving power factor through intelligent control algorithms that manage reactive power flow.
4Ease of operation
If centralized management controls the entire grid, then coordination is improved, but response time to local disturbances worsens
Solution Approach 1:
The patent segments the centralized management function into distributed intelligence at multiple control nodes throughout the grid. Each node autonomously detects and responds to local disturbances in real-time, eliminating the communication delays inherent in centralized control. The segmented architecture maintains coordination through standardized inter-node communication protocols while achieving rapid local response times.
Data Source
AI summary
A distributed control node enables total harmonic control. The control node measures current drawn by a load, including harmonics of the primary current. A metering device can generate an energy signature unique to the load including recording a complex current vector for the load in operation identifying the primary current with a real power component and a reactive power component, and identifying the harmonics with a real power component, a reactive power component, and an angular displacement relative to the primary current. The control node can control a noise contribution of the load due to the harmonics as seen at a point of common coupling to reduce noise introduced onto the grid network from the load.