Rapid Shutdown Circuit for Remote PV Module Inspection
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Solution Overview
Problem
Current rapid shutdown devices (RSDs) for photovoltaic systems are difficult to inspect efficiently, especially when installed on tiled roofs, requiring dismounting and individual measurement of modules, leading to high maintenance costs and labor-intensive processes.
Innovation Solution
A rapid shutdown device with a logic-and-analog circuit, RSD ID storage, and a control command receiving circuit that allows for remote control and inspection of RSDs without dismounting, using a bypass circuit to enable sequential testing of RSDs and photovoltaic modules, reducing the need for physical disassembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If modules are dismounted and measured one by one for RSD inspection, then measurement precision is improved, but loss of time and productivity deteriorate
Solution Approach 1:
The system segments the inspection process by assigning unique IDs to each RSD and enabling individual addressing through control commands. This allows the detector to selectively test specific RSDs (e.g., first RSD, second RSD) without physically disassembling modules, achieving precise targeted inspection while maintaining system integrity and reducing inspection time.
Solution Approach 2:
The patent introduces a detector as an intermediary device that communicates with RSDs through control commands and detection signals. This intermediary enables remote identification and testing of RSDs without direct physical contact or module disassembly, resolving the contradiction between precise measurement and time efficiency.
2Measurement precision
If modules are dismounted for RSD inspection, then measurement precision is improved, but device complexity and ease of operation worsen
Solution Approach 1:
The RSD system performs self-identification through unique IDs and self-testing through controlled activation. The detector sends activation commands to specific RSDs, which then self-test and report their status, eliminating the need for manual disassembly and complex inspection procedures while maintaining high measurement precision.
Solution Approach 2:
The patent replaces the mechanical disassembly process with an electrical/electronic identification and testing system. Instead of physically removing modules to access RSDs, the system uses control commands and electrical signals to identify and test RSDs remotely, substituting mechanical operations with electronic ones for improved ease of operation.
3Productivity
If all RSDs are continuously activated for inspection, then productivity is improved, but energy consumption increases
Solution Approach 1:
The inspection system uses periodic activation of RSDs based on unique ID addressing rather than continuous activation. The detector selectively activates specific RSDs (first RSD, second RSD, etc.) only when needed for testing, allowing other RSDs to remain inactive. This periodic selective activation maintains high inspection productivity while significantly reducing overall energy consumption compared to continuous operation of all RSDs.
Data Source
AI summary
A rapid shutdown device (RSD) includes: a logic-and-analog circuit; an RSD ID storage for storing an unique RSD ID; a control command receiving circuit for receiving and decode a control command including a combination of an all-RSD turn-on command, a single-RSD turn-on command and a to-be-tested RSD ID; a switch circuit connected to the logic-and-analog circuit; and a bypass circuit connected between two output terminals of the RSD. When the switch circuit is turned off, the bypass circuit is turned on. The logic-and-analog circuit controls the on/off state of the switch circuit according to a decoding result of the control command receiving circuit and the unique RSD ID stored in the RSD ID storage. When the switch circuit is turned on, an output voltage received from a photovoltaic module coupled to the RSD is outputted via the RSD.