Segmented Safety Switches for PV Voltage Control
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Solution Overview
Problem
Photovoltaic systems face challenges in safely managing voltage levels during unsafe conditions, requiring disconnecting or short-circuiting PV generators while ensuring compliance with changing safety regulations, and existing solutions are not cost-effective or easily deployable.
Innovation Solution
The implementation of a controllable safety switch system that can be deployed between PV generators, with auxiliary power circuits and communication devices to monitor and control voltage levels, allowing for safe operation by disconnecting or short-circuiting PV generators as needed, and can be retrofitted into existing systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If safety switches are deployed between PV generators to maintain safe voltage levels, then safety compliance is improved, but system complexity and cost increase
Solution Approach 1:
The system divides the PV installation into segments with individual safety switches deployed between PV generators. Each safety switch independently controls voltage levels in its segment, allowing localized safety management without requiring system-wide complexity. This segmentation enables compliance with safety regulations while maintaining manageable system architecture.
Solution Approach 2:
Safety switches serve as intermediary devices between PV generators, actively controlling voltage levels by disconnecting or short-circuiting generators as needed. These intermediary components simplify the overall safety management by providing a dedicated mechanism for voltage control, rather than requiring complex system-wide monitoring and control infrastructure.
2Adaptability or versatility
If safety switches are added to comply with future regulations, then adaptability is improved, but manufacturing cost increases
Solution Approach 1:
The safety switch system is designed to be dynamically configurable, allowing the number and placement of switches to be adjusted based on current and future safety regulations. This dynamic adaptability enables the system to comply with evolving regulations without requiring complete system redesign, thereby controlling manufacturing costs while maintaining regulatory compliance flexibility.
Solution Approach 2:
The safety switches are designed as universal components that can be deployed in various configurations to meet different regulatory requirements. This multi-functionality allows a single component design to serve multiple compliance scenarios, reducing the need for specialized components for each regulation level and thereby controlling manufacturing costs.
3Reliability
If safety switches are deployed in all locations, then safety coverage is improved, but installation difficulty increases
Solution Approach 1:
The system uses segmentation to deploy safety switches at strategically chosen locations between PV generators rather than at every possible point. This segmented approach provides comprehensive safety coverage by dividing the system into manageable segments, each protected by individual switches, while avoiding the installation complexity of universal deployment.
4Reliability
If auxiliary power circuits are added to power safety switches, then operational reliability is improved, but device complexity increases
Solution Approach 1:
The auxiliary power circuits are designed to automatically power the safety switches using energy harvested from the PV system itself. This self-service approach ensures operational reliability by providing continuous power to safety switches without requiring external power sources or complex power management infrastructure, thereby minimizing device complexity while maintaining reliability.
Data Source
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AI summary
Various implementations described herein are directed to a methods and apparatuses for disconnecting, by a device, elements at certain parts of an electrical system. The method may include measuring operational parameters at certain locations within the system and/or receiving messages from control devices indicating a potentially unsafe condition, disconnecting and/or short-circuiting system elements in response, and reconnection the system elements when it is safe to do so. Certain embodiments relate to methods and apparatuses for providing operational power to safety switches during different modes of system operation.