Parallel Inverter Connection Switching for Phase-Safe AC Sharing
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Solution Overview
Problem
Current portable bidirectional energy storage inverters face challenges in ensuring same frequency and phase of mains supply input during parallel operation, and simultaneous powering on/off, which poses security risks and reduces reliability, making parallel operation difficult for ordinary users.
Innovation Solution
A parallel operation connecting device with a control switch, concentrator, and connectors ensures identical AC lines for two energy storage inverters, with a detection circuit to verify connections, allowing simultaneous powering on/off and eliminating phase sequence concerns, using a relay to control mains supply lines and signal wires for safe and reliable parallel operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If independent mains supply input for each inverter is used, then each inverter can operate independently, but frequency and phase consistency cannot be ensured during parallel operation
Solution Approach 1:
The patent divides the mains supply input into two separate alternating current lines (first and second AC lines), each independently connected to one inverter. This segmentation allows independent connection and disconnection of each inverter while maintaining frequency and phase consistency through the concentrator's control mechanism.
Solution Approach 2:
The concentrator acts as an intermediary device that receives the single-phase mains supply and distributes it to two identical alternating current lines. It ensures frequency and phase consistency by controlling the on-off state of both AC lines through a control switch, preventing forced grid connections and voltage differences.
2Ease of operation
If separate power supply lines are used for each inverter, then connection flexibility is improved, but simultaneous powering on/off cannot be achieved
Solution Approach 1:
The patent merges the control of two separate alternating current lines into a single control switch within the concentrator. This allows simultaneous powering on/off of both inverters by controlling the common on-off state of both AC lines, ensuring reliable parallel operation while maintaining connection flexibility.
3Manufacturing precision
If phase sequence consideration is required, then connection accuracy may be improved, but operation complexity increases for ordinary users
Solution Approach 1:
The patent creates equipotential conditions by providing identical alternating current lines to both inverters through the concentrator. This eliminates phase sequence differences and voltage potential differences between the two inverters, allowing ordinary users to connect without considering phase sequence while maintaining high connection accuracy and safety.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution ensures correct L/N wire connection without phase sequence consideration, enables simultaneous powering on/off of energy storage inverters, and detects proper connection to enter parallel operation mode, enhancing safety and usability by avoiding forced grid connections and voltage differences.
Implementation Method 1
using a relay to control mains supply lines
Data Source
AI summary
A parallel operation connecting device includes a control switch, a concentrator, a first connector and a second connector; the concentrator is connected between an alternating current power supply and the first connector and the second connector to form two identical alternating current lines, and on-off of both the two alternating current lines is controlled by the control switch; the control switch is configured to simultaneously switch on the two alternating current lines when the first connector is connected to the first energy storage inverter and the second connector is connected to the second energy storage inverter and simultaneously switch off the two alternating current lines when the first connector is disconnected from the first energy storage inverter and/or when the second connector is disconnected from the second energy storage inverter.