Solar Module Autonomous Voltage Regulation Circuit
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Solution Overview
Problem
Conventional solar modules face challenges in managing increasing string voltage, leading to potential damage and inefficiencies, especially in longer strings, as they require additional cabling and complex control systems to maintain safe voltage levels and prevent ground faults.
Innovation Solution
The integration of a protective circuit with a short-circuit switch and control unit within each solar module allows autonomous voltage regulation, ensuring compliance with maximum common mode and differential mode voltages without additional cabling, enabling longer string connections while maintaining safety and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If solar modules are connected in series to form longer strings for economical energy generation, then the voltage of the string increases, but the risk of ground faults and inverter damage increases
Solution Approach 1:
The solar module is divided into multiple electrically separable parts (first and second parts) with independent short-circuit switches. This segmentation allows selective short-circuiting of individual parts to manage voltage levels while maintaining system operation, resolving the contradiction between long string operation and safety.
Solution Approach 2:
The solar module incorporates autonomous protective circuits with control units that automatically detect voltage conditions and actuate short-circuit switches without external intervention. This self-service mechanism ensures continuous safety monitoring and automatic protection against ground faults and overvoltage conditions.
2Reliability
If safety circuits are added to monitor and protect against ground faults and voltage thresholds, then system safety improves, but device complexity increases
Solution Approach 1:
The protective circuit, control unit, and short-circuit switches are integrated directly into the solar module structure. This merging consolidates multiple safety functions into a unified system, reducing overall device complexity while maintaining comprehensive protection capabilities.
Solution Approach 2:
The control unit autonomously monitors voltage conditions and automatically actuates short-circuit switches without requiring external control systems or complex wiring. This self-service approach simplifies the overall system architecture while ensuring reliable safety protection.
3Reliability
If additional short-circuit paths with switches are added to protect against overvoltage, then system reliability improves, but installation expense increases
Solution Approach 1:
The short-circuit switches and protective circuits are integrated into the solar module manufacturing process itself, combining multiple functions into a single manufactured unit. This integration eliminates the need for additional field installation of separate protection components, reducing installation expenses while maintaining reliability.
4Reliability
If the string is disconnected from the inverter to protect against ground faults, then system safety improves, but energy production is interrupted
Solution Approach 1:
The solar module is segmented into multiple parts with independent short-circuit switches, allowing selective short-circuiting of only the affected part while keeping the rest of the module and string operational. This segmentation enables localized protection without forcing complete system disconnection, maintaining energy production continuity.
Solution Approach 2:
The autonomous control unit detects ground fault conditions and automatically actuates the appropriate short-circuit switch to isolate only the faulty section. This self-service mechanism provides targeted protection that maintains overall system operation and energy production while protecting against ground faults.
Data Source
AI summary
A solar module includes one or more photovoltaic (PV) modules, a short-circuit switch connected in parallel with at least one of the one or PV modules, and a control unit connected in parallel with the short-circuit switch. The at least one of the one or more PV modules supplies electrical power to the control unit and is connectable via a first and a second module terminal to further solar modules to form a string. The control unit is configured to actuate the short-circuit switch depending on an insulation voltage dropped between a ground potential reference terminal of the solar module and one of the first and second module terminals.