Watt-hour Meter DER Interconnection with Surge Protection
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Solution Overview
Problem
The integration of distributed energy resources (DERs) into the electrical grid poses challenges in ensuring safety, power quality, and automatic disconnect capabilities while meeting compliance with interconnection requirements, particularly in facilitating the transition to a smarter grid.
Innovation Solution
A watt-hour meter with electrical junction points that interface DERs to energy-consuming structures and the electrical distribution grid, incorporating surge protection, voltage and current sensors, relays, and a core processor for data computation and control, ensuring safe and efficient integration and disconnect capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If DERs are integrated into the electrical grid, then power generation capacity and grid intelligence are improved, but safety risks and power quality issues worsen
Solution Approach 1:
The patent introduces a watt-hour meter with electrical junction points as an intermediary device between DERs and the grid. This meter includes surge protection devices, relays, and monitoring components that mediate the connection, providing safety functions while enabling power generation integration. The meter acts as a buffer that allows DER connectivity while protecting the grid from potential hazards.
Solution Approach 2:
The patent segments the electrical connection into distinct functional zones within the watt-hour meter housing. Separate electrical junction points are provided for grid connection, DER connection, and load connection. This segmentation allows independent control and protection of each connection point, enabling safe DER integration while maintaining grid stability.
2Productivity
If DERs are integrated into the electrical grid, then renewable energy utilization is improved, but power quality degradation worsens
Solution Approach 1:
The watt-hour meter serves as an intermediary that monitors and manages power flow between DERs and the grid. It includes surge protection devices that filter harmful electrical transients, and relays that control power flow to maintain voltage and frequency stability. This mediation allows renewable energy utilization while protecting power quality.
Solution Approach 2:
The patent incorporates surge protection devices and protective relays that act in advance to prevent power quality degradation. These components are positioned to detect and counteract harmful electrical conditions before they can affect the grid or DERs, providing preliminary protection against voltage spikes, frequency variations, and other power quality issues.
3Device complexity
If manual disconnect procedures are used for DERs, then system simplicity is improved, but safety and compliance worsen
Solution Approach 1:
The watt-hour meter incorporates automatic disconnect functionality that operates without manual intervention. The relay system automatically detects grid conditions and opens or closes connections as needed, enabling the system to self-manage safety functions. This eliminates the need for manual disconnect procedures while maintaining safety and compliance requirements.
Solution Approach 2:
The patent includes monitoring components that continuously detect grid conditions and provide feedback to the relay control system. Based on this feedback, the relays automatically adjust connection status to maintain safety and compliance. This feedback mechanism enables automatic disconnect capability while keeping the overall system design relatively simple.
Data Source
AI summary
A watt-hour meter may include one or more electrical junction points that interface a Distributed Energy Resource to an energy-consuming structure and to the electrical distribution grid, while maintaining compliance with interconnection requirements for safety, power quality and automatic disconnect capabilities.