Photovoltaic Rapid Turnoff Control Without Heartbeat Signals
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Solution Overview
Problem
Conventional photovoltaic systems require continuous heartbeat signals or periodic excitation pulses from a central controller to maintain shutdown devices, leading to high software resource occupation and increased power consumption.
Innovation Solution
A rapid shutdown method and device for photovoltaic modules that allow the shutdown device to autonomously control its state based on status parameters, reducing the need for continuous communication from a central controller by using a switching unit, bypass diode, driving unit, parameter collecting module, and processor to detect faults in the inverter channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous heartbeat signals or periodic excitation pulses are transmitted from the central controller to maintain shutdown devices in the on-state, then the shutdown devices can be reliably controlled, but software resources of the central controller are occupied and power consumption increases
Solution Approach 1:
The shutdown device is equipped with a processor that autonomously determines whether to remain in the on-state by detecting status parameters (such as current flow) without requiring continuous external control signals. The device serves itself by making control decisions based on local sensing, eliminating the need for the central controller to continuously transmit heartbeat signals or excitation pulses.
Solution Approach 2:
The control decision-making function is extracted from the central controller and transferred to the shutdown device itself. By removing the continuous control signal transmission requirement from the central controller, software resources are freed and power consumption is reduced while the shutdown device maintains autonomous control capability.
2Reliability
If continuous heartbeat signals or periodic excitation pulses are transmitted from the central controller to maintain shutdown devices in the on-state, then the shutdown devices can be reliably controlled, but software resources of the central controller are occupied
Solution Approach 1:
The shutdown device autonomously monitors its own status parameters and determines whether to maintain the on-state without requiring continuous software intervention from the central controller. This self-service approach simplifies the central controller's software by removing the need for continuous heartbeat signal generation and handling.
Solution Approach 2:
The control logic and decision-making software are extracted from the central controller and implemented in the shutdown device's processor. This distribution of control functionality reduces the software burden on the central controller while maintaining reliable shutdown device operation.
Data Source
AI summary
A photovoltaic assembly turnoff device, and a photovoltaic system. The rapid turnoff method includes: after receiving a start signal, a photovoltaic assembly turnoff device controls itself to be turned on, so that a photovoltaic assembly connected thereto achieves electric energy output; then, the photovoltaic assembly turnoff device can measure a state parameter thereof to determine whether a corresponding inverter channel in a photovoltaic system has a fault; if the corresponding inverter channel in the photovoltaic system has the fault, control the photovoltaic assembly turnoff device to be turned off, so that the photovoltaic assembly connected thereto stops the electric energy output; if the corresponding inverter channel in the photovoltaic system has no fault, always keep the photovoltaic assembly turnoff device to be turned on.