Inverter Grid Type Identification via Voltage Sampling
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Solution Overview
Problem
Manual identification of grid types for inverter devices is time-consuming and laborious, especially when connecting multiple inverters to different low-voltage power grids, requiring complex parameter resetting.
Innovation Solution
An inverter device with a control unit that automatically identifies grid types by sampling voltages between power lines and neutral lines, using both grid-connected switching units and control ground lines to determine whether the grid is 208V or 240V based on voltage relationships and vector analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual identification of grid type is performed, then accurate grid type determination is achieved, but time consumption and labor requirements increase significantly
Solution Approach 1:
The inverter device automatically performs grid type identification by itself without requiring professional personnel intervention. The control unit samples voltages and automatically determines grid type (208V or 240V), making the system self-serve in the identification process.
Solution Approach 2:
The patent replaces manual mechanical operation with automated electrical measurement and control. The control unit uses voltage sampling and vector analysis to automatically identify grid type, substituting the manual mechanical process with an automated electrical control system.
2Reliability
If professional personnel manually reset control parameters and protection parameters when grid type changes, then correct parameters are configured, but the process becomes complicated and time-consuming
Solution Approach 1:
The control unit continuously monitors grid voltage characteristics and automatically adjusts control parameters and protection parameters based on the identified grid type. This feedback mechanism ensures correct parameter configuration without manual intervention.
Solution Approach 2:
The inverter performs grid type identification and parameter configuration in advance before actual operation. By determining grid type and setting parameters preliminarily, the system avoids complicated on-site parameter resetting when grid type changes.
3Power
If the number of grid-connected inverters is large, then power system capacity increases, but manual identification and parameter setting becomes increasingly laborious
Solution Approach 1:
Each inverter device independently performs automatic grid type identification and parameter configuration without requiring professional personnel for each unit. This self-service capability dramatically improves installation efficiency when deploying multiple inverters.
Data Source
AI summary
A method for identifying type of a grid automatically and an inverter device thereof are provided. The inverter device comprises a power line L1, a power line L2, a neutral line N and a ground line electrically connectable to a first power line, a second power line, a neutral line and a ground line of the grid, respectively. The method comprises: sampling at least two of voltages between L1 and L2, between L1 to N and between L2 to N when the two neutral lines are connected, and identifying the type of the grid based on the sampling result; and sampling the voltage between L1 and L2 when the two neutral lines are not connected, sampling at least one of a voltage between L1 and GND and between L2 and GND with cooperation of a grid-connected switching unit, and identifying the type of the grid based on the sampling results.