Parallel Inverter Phase Swapping for Positional 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 operation and load balancing in power systems.
Innovation Solution
The solution involves swapping two phases of the three-phase output connections of DC to AC three-phase inverters within a junction box, allowing for the sensing of parameters like voltage, current, and phase angle to verify the lateral positioning of inverters, and using proximity sensors to detect the presence of nearby devices, thereby enabling accurate mapping and monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If traditional monitoring methods are used to read inverter parameters, then basic power conversion efficiency can be monitored, but inverter positional awareness and lateral positioning verification cannot be achieved
Solution Approach 1:
The system performs preliminary actions by swapping two phases of the three-phase output connections before monitoring. This phase swapping creates a distinctive electrical signature that allows the monitoring system to determine the lateral position of each inverter based on the phase angle relationships, thereby capturing positional information that would otherwise be lost
Solution Approach 2:
The invention changes the electrical parameters of the inverter output by swapping two phases of the three-phase connection. This parameter change (phase sequence modification) enables the monitoring system to distinguish between different lateral positions of inverters by detecting changes in phase angles and sequence, thus recovering positional information without adding complex hardware
2Reliability
If inverters are installed without verified lateral positioning, then installation is simple and quick, but faulty or swapped units cannot be detected and load balancing is compromised
Solution Approach 1:
The monitoring system provides feedback by continuously measuring phase angles and comparing them against expected values for correct lateral positioning. When an inverter is incorrectly positioned or faulty, the system detects the anomaly through phase angle deviations and can alert operators, thereby ensuring system reliability without complicating the installation process
Solution Approach 2:
The system performs self-verification by using its own monitoring capabilities to detect positioning errors and faults. The phase swapping technique enables the system to automatically determine inverter positions and identify issues without requiring external verification tools or complex installation procedures, maintaining ease of operation while improving reliability
Data Source
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.