Distributed Power Converter Control Without a Central Controller
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Solution Overview
Problem
In distributed power conversion systems, existing technologies face inefficiencies due to uncoordinated operation of DC/DC converters, leading to high switching losses, voltage unbalance, and increased costs, particularly under light loads, and rely on centralized controllers that can cause single-point failures.
Innovation Solution
A method and device for controlling distributed power conversion systems by configuring control units to generate and compare coordination variables, allowing power modules to operate based on their serial numbers and optimal operating numbers, thereby eliminating the need for a centralized controller and optimizing module operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a centralized controller is used to coordinate power modules, then system control capability is improved, but system reliability deteriorates due to single-point failure
Solution Approach 1:
The centralized controller is segmented into distributed control units, with each power module having its own control unit. The coordination function is distributed among all control units rather than concentrated in a single controller, eliminating the single-point failure issue while maintaining coordination capability.
Solution Approach 2:
Each control unit autonomously determines its own operating state by comparing its serial number with the optimal operating number calculated from coordination variables. The system achieves coordination through self-service decision-making at each module level without requiring a central authority.
2Ease of operation
If all power modules operate simultaneously under light load, then power sharing is simplified, but system efficiency deteriorates due to high inherent losses
Solution Approach 1:
The number of operating power modules is dynamically adjusted based on the optimal operating number calculated from coordination variables. Under light load conditions, fewer modules operate to reduce inherent losses, while under heavy load, more modules operate to share the power demand, optimizing efficiency across different operating conditions.
Solution Approach 2:
The system changes the operating parameter of the number of active modules based on load conditions. By calculating the optimal operating number from coordination variables and comparing it with module serial numbers, the system dynamically determines which modules should operate to minimize total system loss while meeting power demands.
3Loss of energy
If DC/DC converters operate in burst mode under light load, then switching loss is reduced, but output voltage ripple increases
Solution Approach 1:
Power modules operate in periodic burst mode where each module is turned on and off in sequence according to the coordination control. The periodic activation of modules in a rotating sequence based on serial number comparison reduces switching losses while the distributed timing of bursts across multiple modules helps mitigate voltage ripple compared to simultaneous bursting.
Data Source
AI summary
A method for controlling a distributed power conversion system comprises: configuring N control units for controlling N power modules of the system respectively, wherein each of the control units is configured to execute: step S1, generating a first variable Q1 reflecting respective module serial numbers R according to a coordination variable; step S2, generating a second variable Q2 reflecting the optimal operating number M of the modules; and step S3, comparing the first variable Q1 and the second variable Q2, wherein, when the first variable Q1 is greater than the second variable Q2, the corresponding power module stops; and when the first variable Q1 is less than or equal to the second variable Q2, the corresponding power module runs.