Power Supply System Voltage Conversion Response Synchronization
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Solution Overview
Problem
In electric vehicles with multiple power storage units of different capacities, voltage conversion units with varying capabilities can cause unwanted circulation currents during startup, potentially damaging the power storage units due to differences in response characteristics.
Innovation Solution
A power supply system with a control system that adjusts the control gains in feedback units to match the response characteristics of voltage conversion units, ensuring that the time taken to reach a standard output value is consistent across all units, thereby preventing voltage differences and circulation currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple power storage units with different battery capacities are provided to increase overall battery capacity, then the battery capacity is improved, but voltage differences occur during transition causing unwanted circulation currents
Solution Approach 1:
The control system performs preliminary action by adjusting control gains before voltage conversion operations begin. The controller pre-calculates and sets appropriate control gains for each voltage conversion unit based on their specific characteristics, ensuring that response characteristics are matched before any voltage conversion occurs, thereby preventing circulation currents from the outset
Solution Approach 2:
The invention applies parameter changes by dynamically adjusting control gains in the feedback control of each voltage conversion unit. The controller modifies the control parameters (gains) to compensate for differences in inductance and other characteristics, making the response characteristics of all voltage conversion units consistent, which eliminates voltage differences and prevents circulation currents
2Loss of energy
If voltage conversion units with different voltage conversion capabilities are used to match different battery capacities, then voltage conversion efficiency is improved, but response characteristics differ causing voltage differences during transition
Solution Approach 1:
The controller changes control parameters by adjusting control gains for each voltage conversion unit based on their specific capabilities. This allows units with different voltage conversion capabilities to operate harmoniously with matched response characteristics, maintaining voltage stability while preserving the energy efficiency benefits of customized voltage conversion units
Solution Approach 2:
The invention implements feedback control where the controller continuously monitors the output of each voltage conversion unit and adjusts control gains accordingly. This feedback mechanism ensures that response characteristics remain matched across all units, preventing voltage differences during transitions while allowing each unit to operate at its optimal efficiency point
3Object-affected harmful factors
If control gains are adjusted to match response characteristics of voltage conversion units, then circulation currents are suppressed, but control system complexity increases
Solution Approach 1:
The control system applies self-service by automatically calculating and adjusting control gains without requiring manual intervention. The controller autonomously determines appropriate control gains based on the characteristics of each voltage conversion unit, simplifying the overall system operation while effectively suppressing circulation currents
Solution Approach 2:
The invention manages complexity through systematic parameter changes where control gains are adjusted based on predefined relationships with voltage conversion unit characteristics. This structured approach to parameter adjustment makes the control system manageable while achieving the goal of suppressing circulation currents
Data Source
AI summary
Transfer functions of control have duty commands as inputs and battery current values as outputs, provided corresponding to respected converters. Control gains are determined such that certain transfer functions substantially match with each other, with respect to delay elements.