Meter Socket Adapter Islanding Control for Bidirectional DERs
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Solution Overview
Problem
Current electrical power storage and deployment systems, particularly in electric vehicles, lack efficient integration with distributed energy resources and grid stability, leading to challenges in managing energy flow and preventing overcurrent conditions during grid outages.
Innovation Solution
A meter socket adapter (MSA) system with integrated sensors and communication circuits that monitor grid voltage and current, allowing for seamless integration with distributed energy resources (DERs) and enabling whole-building disconnect switches to isolate buildings from the utility grid, facilitating islanding mode and efficient energy management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple bidirectional distributed energy resources are integrated into the electrical system, then energy management capability and grid stability are improved, but the risk of overcurrent conditions and system complexity increase
Solution Approach 1:
The patent introduces a meter socket adapter as an intermediary device that connects between the utility grid and multiple distributed energy resources. This adapter provides a standardized interface and control mechanism that simplifies the integration of multiple DERs without requiring complex modifications to each individual resource or the main electrical panel. The adapter acts as a mediator that manages power flow and coordination between diverse energy sources.
Solution Approach 2:
The meter socket adapter is designed with multi-functional capabilities to handle various distributed energy resources (photovoltaic systems, wind turbines, energy storage systems, electric vehicles) through a single universal interface. It performs multiple functions including power flow management, islanding detection, overcurrent protection, and coordination of bidirectional power transfer, eliminating the need for separate specialized equipment for each DER type.
2Reliability
If islanding mode is enabled to provide power during grid outages, then reliability and power supply continuity are improved, but the risk of overcurrent conditions and safety hazards increase
Solution Approach 1:
The meter socket adapter incorporates real-time monitoring of grid voltage, current, and frequency parameters with automatic feedback control mechanisms. When grid failure is detected, the system continuously monitors the islanded microgrid conditions and adjusts power flow from distributed energy resources to prevent overcurrent conditions. The feedback loop ensures safe operation by detecting abnormal conditions and triggering protective actions.
Solution Approach 2:
The system performs preliminary detection of grid outage conditions and proactively transitions to islanding mode before complete power failure occurs. Overcurrent protection mechanisms are pre-configured and activated during the transition to islanded operation, preventing harmful current conditions before they can develop. The adapter prepares protective relays and control circuits in advance to ensure safe islanding operation.
3Productivity
If bidirectional power flow is allowed for energy storage and distributed energy resources, then energy efficiency and grid stability are improved, but the complexity of power flow management and control increases
Solution Approach 1:
The patent combines multiple power flow control functions into a single meter socket adapter unit that manages bidirectional power flow for multiple distributed energy resources simultaneously. It merges energy storage charging/discharging control, photovoltaic power injection management, load coordination, and grid interaction control into one integrated device, simplifying the overall system architecture while maintaining efficient bidirectional power flow.
Data Source
AI summary
A meter socket adapter may include an integrated whole-building disconnect switch configured to disconnect a building associated with the meter socket adapter from a utility grid, a distributed energy resource (DER) interface to connect a distributed energy resource (DER), and an energy management system (EMS) configured to monitor electrical current passing through the meter socket adapter and, based on the monitored current, actuate the whole-building disconnect switch.