Inverter Interconnection Bus with Continuous Conductors
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Solution Overview
Problem
Existing power delivery systems from arrays of DC-AC inverters to an AC grid face inefficiencies and reliability issues due to daisy-chained connections, which can lead to power loss and system failure upon fault in a single inverter, and require costly and complex protective devices.
Innovation Solution
A system utilizing a cable assembly with continuous conductors and tap connections, where each inverter is connected via a single separable connector to a power delivery bus, reducing power loss and allowing for localized fault isolation with protective circuit elements like fuses and surge protectors, and incorporating an earth ground for safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If daisy-chained connections are used to interconnect inverters, then the system can be assembled with simple connectors, but power loss increases and reliability decreases due to faults propagating through the entire array
Solution Approach 1:
The patent segments the power delivery system by replacing continuous daisy-chained connections with independent radial connections from a common bus. Each inverter connects individually to the bus via separate conductors, isolating faults to individual inverters rather than propagating them through the entire array. This segmentation maintains ease of assembly while dramatically improving reliability.
2Device complexity
If daisy-chained connections are used, then connector complexity is reduced, but protective devices become more costly and complex to ensure system safety
Solution Approach 1:
The patent introduces a common bus as an intermediary component that centralizes protective devices. Instead of requiring protective equipment at each connector interface in a daisy-chain, the bus provides a centralized location for breakers and surge protectors. This intermediary structure simplifies the overall protective circuitry while maintaining safety, as the bus acts as a common protection point for all inverters.
3Reliability
If radial connections with continuous conductors are used, then power loss is minimized and reliability is improved, but the cable assembly complexity increases
Solution Approach 1:
The patent merges multiple individual inverter connections into a single integrated cable assembly with a common bus. Rather than using separate cables for each inverter, the system combines all conductor paths into one unified assembly that terminates at a common location. This merging reduces the number of separable connectors and simplifies installation while maintaining the reliability benefits of radial connections.
Data Source
AI summary
A system and apparatus for interconnecting an array of power generating assemblies includes a cable assembly having a plurality of continuous conductors and a plurality of cable connectors electrically coupled to the continuous conductors. The continuous conductors are configured to receive inverter AC power generated by inverters and deliver the combined AC power to an AC grid or other power sink. The cable connectors are configured to mate with corresponding connectors of the inventers to deliver the AC power to the continuous conductors.