PV Module Controller Circuit Rapid Shutdown Protocol
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Solution Overview
Problem
Current photovoltaic (PV) systems face challenges in meeting rapid shutdown requirements due to the lack of a unified communication protocol across different components from various manufacturers, which complicates interoperability and compliance with electrical codes and standards.
Innovation Solution
A controller circuit and method for PV modules that include a receiver circuit and a mode control and power conversion circuit, capable of switching between operating and standby modes in response to signals, ensuring safe voltage levels for maintenance and shutdown, utilizing a single communication protocol for interoperability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If module-level shutdown is implemented to meet NEC 2017 requirements, then safety for technicians and responders is improved, but device complexity increases due to additional communication protocols and control circuits
Solution Approach 1:
The controller circuit performs multiple functions: it serves as both a power management controller and a rapid shutdown communication node. The same controller that manages the PV module's power conversion also handles SunSpec protocol communication for rapid shutdown signaling, eliminating the need for separate dedicated shutdown communication hardware and reducing overall device complexity.
Solution Approach 2:
The patent combines the rapid shutdown communication functionality with the existing controller circuit architecture. The receiver circuit and mode control circuit are integrated into the same controller that performs power management, merging safety communication functions with power conversion control in a single unified device.
2Adaptability or versatility
If a unified communication protocol is adopted across different PV components, then interoperability is improved, but manufacturing complexity increases due to standardization requirements
Solution Approach 1:
The controller circuit is designed to universally communicate with other PV system components using the SunSpec protocol. This single standardized communication interface allows the controller to interoperable with various manufacturers' equipment (inverters, other modules, monitoring systems) without requiring manufacturer-specific communication hardware or protocols, simplifying system integration despite standardization requirements.
3Object-affected harmful factors
If the controller switches to standby mode with reduced voltage, then safety is improved, but power output is reduced
Solution Approach 1:
The controller dynamically switches between two operational modes based on real-time conditions: normal mode for power generation and standby mode for safety. The mode control circuit responds to receiver circuit signals to transition the power conversion circuit between these states, allowing the system to adapt its power output level according to operational requirements and safety conditions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables compliant and efficient rapid shutdown of PV systems, ensuring safety for technicians and responders by providing a unified communication protocol and safe voltage levels, enhancing interoperability between diverse PV system components.
Implementation Method 1
The switching converter circuit is configured to: receive a direct current (DC) voltage from a string of PV cells; convert the DC voltage to an operating voltage in a first mode; and convert the DC voltage to a standby voltage in a second mode.
Data Source
AI summary
A controller circuit for a PV module includes a receiver circuit and a mode control and power conversion circuit. The receiver circuit receives a first signal from a transmitter circuit and changes a second signal from a first state to a second state responsive to the first signal. The mode control and power conversion circuit receives a DC voltage from a string of PV cells, receives the second signal from the receiver circuit, switches from a first mode to a second mode in response to the second signal being in the second state, converts the DC string voltage to a standby voltage in the second mode, and provides the standby voltage to DC power lines. The standby voltage is less than an operating voltage provided by the mode control and power conversion circuit in the first mode.