Parallel Power Conversion System Wiring Simplification
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Solution Overview
Problem
Conventional power conversion systems with multiple devices connected in parallel experience complex wiring due to the increased number of signal lines required for current sensing and communication between devices, leading to a complicated wiring configuration.
Innovation Solution
A power conversion system where each device includes a communication circuit to transmit and receive load current values through a communication line, allowing for simplified wiring by using multicore cables and differential signal transmission, enabling the calculation and elimination of cross currents without the need for direct connections between operation circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If each power conversion device is connected via signal lines to current sensors of other power conversion devices, then cross current can be reduced, but the number of signal lines increases and wiring becomes complicated
Solution Approach 1:
A communication line is introduced as an intermediary medium between power conversion devices and current sensors. Instead of direct signal line connections between devices and sensors, the communication line serves as a mediator that transmits current sensor data to all power conversion devices, thereby reducing wiring complexity while maintaining the capability to detect and reduce cross currents
Solution Approach 2:
The communication line performs multiple functions: it transmits current sensor data from any power conversion device to all other devices, enabling universal access to current information across the system. This multi-functional communication infrastructure replaces the need for dedicated signal lines between each device and sensor, simplifying the overall wiring configuration
2Power
If the number of power conversion devices is increased, then power conversion capacity is improved, but the number of signal lines increases and wiring configuration becomes complicated
Solution Approach 1:
Multiple individual signal line connections are merged into a single communication line infrastructure. Instead of having separate signal lines for each power conversion device connection, all devices share a common communication line that carries current sensor data from any device to all others, thereby maintaining power conversion capacity while preventing wiring complexity from increasing with device count
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
This configuration prevents the complexity of wiring from increasing with the number of power conversion devices, maintaining a simplified and efficient communication network for current management.
Implementation Method 1
an inverter converting direct-current (DC) power into alternating-current (AC) power and supplying the AC power to the load
Data Source
AI summary
A power conversion system includes n (n being an integer of 2 or more) power conversion devices (P1 to P4) connected in parallel to a load (4); and a communication line (2) connected to the n power conversion devices (P1 to P4). Each of power conversion devices includes a communication circuit (10) which transmits a load current value detected by a current sensor (37) to each of other (n−1) power conversion devices through the communication line (2), and receives (n−1) load current values transmitted through the communication line (2) from other (n−1) power conversion devices; and an operation circuit (11) calculating a shared current and a cross current of the corresponding power conversion device based on the n load current values. Accordingly, a wiring line is prevented from becoming complicated even when the number of power conversion devices is increased.