Power Converter Proportional Gain Adjustment for Single Unit Detection
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Solution Overview
Problem
In parallel multiplexed power conversion systems, it is difficult to determine if a power conversion unit is operating alone, making it challenging to stop unnecessary units and improve efficiency, as existing solutions rely on external information.
Innovation Solution
A power conversion device with parallel multiplexable units, where each unit includes a power converter, a voltage controller with a voltage adjuster for proportional control, and an operation manager that changes the proportional gain to determine if it is operating alone by comparing changes in steady-state offset and gain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If power conversion units are configured in parallel multiplex to eliminate custom design needs, then adaptability and ease of manufacture are improved, but it becomes difficult to determine whether a unit is operating alone, preventing efficiency optimization
Solution Approach 1:
Each power conversion unit independently determines its own operational state by monitoring its output current and comparing it with the sum of reference currents from other units. This self-service approach eliminates the need for external information or complex inter-unit communication while accurately identifying single versus parallel operation modes for efficiency optimization.
2Reliability
If all power conversion units operate continuously to maintain system availability, then reliability is improved, but energy efficiency deteriorates when only one unit is needed
Solution Approach 1:
The operational state of power conversion units is made dynamic rather than static. Units can switch between operating and stopped states based on real-time conditions. The system dynamically adjusts the number of active units according to load requirements, allowing efficiency optimization without compromising reliability, as units can be quickly activated when needed.
3Stability of the object's composition
If power averaging function is implemented to prevent power concentration, then load distribution is improved, but the ability to identify single operation mode and stop unnecessary units is lost
Solution Approach 1:
The system implements feedback by continuously monitoring the output current of each power conversion unit and comparing it with the sum of reference currents from other units. This feedback mechanism provides real-time information about the operational state, enabling the system to identify single operation mode and make appropriate control decisions while maintaining stable load distribution through the power averaging function.
Data Source
AI summary
A power conversion device is configured with a plurality of power conversion units multiplexed in parallel each having a power converter for converting a power between a power source and a common load. At least one of the power conversion units is provided with an operation manager for managing the operation of the power converter. The operation manager changes the proportional gain of a voltage adjuster that performs a proportional control by inputting the steady-state offset between a target voltage and a voltage to the load, to determine, by comparing a change in the steady-state offset with a change in the proportional gain, whether the at least one power conversion unit is in a single operation in which the other power conversion units are in no operation.