PV Inverter DC/DC Short-Circuit Numbering for Optimizer Strings
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Solution Overview
Problem
The duration required for setting string numbers on photovoltaic optimizers in a photovoltaic power generation system increases with the number of connected optimizers, necessitating a more efficient method to shorten this process.
Innovation Solution
A power supply system and control method that involves short-circuiting an input end of a DC/DC circuit, allowing multiple direct current converters to simultaneously set their numbers based on preset operating parameters, using broadcast indications and sequential control to ensure all converters in a DC/DC circuit complete number setting efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If string numbering is performed sequentially on each photovoltaic optimizer one by one, then the system can reliably identify and configure each optimizer, but the total duration for setting string numbers increases significantly as the quantity of optimizers increases
Solution Approach 1:
The patent segments the string number setting process by dividing optimizers into different voltage ranges (first voltage range and second voltage range). The inverter performs sequential voltage adjustment and detection on different voltage range groups rather than processing all optimizers one by one in a single sequence. This segmentation allows parallel processing of different voltage groups, reducing total setting duration while maintaining reliable identification through controlled voltage steps.
2Measurement precision
If the inverter controls only one photovoltaic optimizer at a time to set string numbers, then each optimizer can be accurately configured, but the overall system configuration time increases with the number of optimizers
Solution Approach 1:
The patent implements periodic action by cycling through different voltage adjustment steps (first voltage adjustment, second voltage adjustment, third voltage adjustment) and detection phases. The inverter periodically switches between adjusting voltage to different ranges and detecting which optimizers respond to each voltage level. This periodic cycle of adjustment-detection-adjustment allows multiple optimizers to be identified and configured in batches, significantly improving configuration speed while maintaining accurate identification through repeated verification at different voltage levels.
Data Source
AI summary
A power supply system includes at least four direct current converters and an inverter. The inverter includes at least two DC/DC circuits. The inverter controls an input end of one DC/DC circuit in the at least two DC/DC circuits to be short-circuited. The at least four direct current converters detect, in response to a case in which the input end of the DC/DC circuit in the at least two DC/DC circuits is short-circuited, whether output operating parameters of the at least four direct current converters meet a preset operating parameter range, and set a number for a direct current converter that is in the at least four direct current converters and whose output operating parameter meets the preset operating parameter range.