Backup Interface Module for Selective Microgrid Load Switching
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Solution Overview
Problem
During electrical grid outages, existing systems fail to provide uninterrupted power to critical loads, and existing backup configurations are either insufficient or overly complex, lacking flexibility in managing power distribution among different load groups.
Innovation Solution
A backup interface enclosure with electric circuitry and a base plate that allows for the formation of a microgrid by disconnecting load groups from the utility grid and connecting them to backup power sources, such as photovoltaic sources or batteries, with a modular design enabling configurable backup configurations through relays and detection circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a backup power source is installed to provide uninterrupted power during grid outages, then reliability of critical loads is improved, but device complexity and cost increase
Solution Approach 1:
The system segments loads into different groups (critical and non-critical loads) and provides selective backup power to each group. The interface enclosure divides the electrical system into separate controllable sections, allowing backup power to be applied only where needed rather than to the entire system, thus improving reliability of critical loads while limiting complexity growth.
Solution Approach 2:
The system dynamically switches between grid power and backup power sources based on grid availability and load priority. Relays and detection circuits enable automatic transition between power sources, and the system can adapt its configuration by connecting or disconnecting different load groups from backup power as conditions change, providing flexible reliability enhancement without permanent complex wiring for all loads.
2Reliability
If all loads are connected to backup power source in full backup configuration, then reliability is improved, but cost and complexity of backup system increases significantly
Solution Approach 1:
The system divides loads into multiple groups with different priority levels. The interface enclosure provides separate connection points and control for each load group, enabling selective backup power distribution. This segmentation allows the system to achieve reliable power for critical loads without the complexity and cost of protecting every single load, as non-critical loads can be excluded from backup coverage.
Solution Approach 2:
Different load groups receive different levels of backup power protection based on their criticality. Critical loads are connected to backup power sources through the interface enclosure while non-critical loads are excluded or receive lower priority service. This local differentiation of power protection quality optimizes the balance between reliability improvement and system complexity by applying backup power only where most needed.
3Adaptability or versatility
If backup interface enclosure is designed with modular components for flexibility, then adaptability to different configurations is improved, but device complexity increases
Solution Approach 1:
The interface enclosure is designed as a modular assembly with separate detection circuits, relay modules, and connection terminals that can be independently configured. Each module performs a specific function (grid detection, load switching, backup power connection) and can be adjusted or replaced based on the desired backup configuration, providing adaptability while keeping individual module complexity manageable.
Solution Approach 2:
The interface enclosure is designed to support multiple backup configurations (full backup, partial backup, different load group priorities) using the same basic modular components. The detection circuits and relays can be programmed or wired to achieve different operational modes, allowing a single universal interface enclosure design to adapt to various customer needs without requiring completely different hardware for each configuration scenario.
Data Source
AI summary
Systems, apparatuses, and methods are described for a backup system. The configuration of the backup system in terms of number of load groups, power sources, and/or total power limit may be altered. An interface enclosure of the backup system may include a housing for electric circuitry, where the housing may be a clam-shell design including a base plate and a backup interface module. The base plate may comprise a frame, one or more detachable hinges, and/or two or more multi-terminals. The base plate may include a plurality of multi-terminals. The multi-terminals may be arranged to connect to one or more load groups, power sources, power devices, other multi-terminals, etc. Each load group that is connected to the multi-terminals may be disconnected from the utility grid and connected to the one or more sources of backup power in the case of a utility grid shutdown.