Parallel Inverter Phase Sensing for Lateral Position Verification
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Solution Overview
Problem
Current power system monitoring and control methods lack effective means to verify the lateral positioning of DC to AC three-phase inverters, which is crucial for mapping and identifying inverters, detecting faulty or swapped units, and ensuring proper installation and operation.
Innovation Solution
The implementation of proximity sensors and targets on power device housings, combined with sensing parameters from AC output terminals, allows for the verification of lateral positioning and identification of inverters, enabling monitoring and sensing to establish the location and status of each inverter relative to others, and ensuring correct installation and operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional monitoring methods (display mounted on inverter housing) are used, then the system is simple and cost-effective, but the system cannot verify lateral positioning of inverters or detect faulty units
Solution Approach 1:
The patent introduces proximity sensors as intermediary devices that detect the presence and position of neighboring inverters. These sensors act as mediators between the inverter housing and the monitoring system, providing positional information without requiring complex direct communication between all system components. The sensors enable reliable inverter identification and positioning while maintaining relatively simple system architecture.
2Reliability
If no positional verification method is implemented, then the system remains simple, but the system cannot detect swapped or faulty inverters
Solution Approach 1:
The monitoring system utilizes the inverters' own operational characteristics (AC output parameters such as voltage, current, and frequency) to verify their positional status. Each inverter essentially monitors itself and its neighbors by comparing expected versus actual electrical parameters, enabling detection of swapped or faulty units without requiring external verification equipment.
3Measurement precision
If proximity sensors and targets are added to verify lateral positioning, then inverter localization accuracy improves, but system cost and complexity increase
Solution Approach 1:
The patent replaces complex mechanical positioning verification systems with electrical field-based proximity sensing. Instead of using mechanical markers, physical measurements, or manual verification procedures, the system uses electromagnetic fields detected by proximity sensors to determine inverter positions and orientations. This substitution achieves precise measurement while maintaining relatively simple implementation.
Data Source
Figure 1A~1B
Figure 1C
Figure 1D
AI summary
A method and a system sense at least one phase difference between at least two phases of a group of parallel connected three phase AC output terminals (e.g., a first phase AC output terminal, a second phase AC output terminal, or a third phase AC output terminal). The parallel connected AC output terminals may be three parallel connected DC to AC three phase inverters. Features of the parallel connected three phase AC output terminals enable wiring of conductors to one phase of an AC output terminal to be swapped with wiring of conductors of one phase of another phase AC output terminal. A sign of at least one phase difference is verified different from signs of other phase differences thereby the system determining the lateral position of the at least one three phase inverters relative to at least one other of the three phase inverters.