DC/DC Converter Droop Control for Fast Link Voltage Response
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Solution Overview
Problem
Conventional DC/DC converters have fixed droop control curves and operation points, leading to non-response issues during voltage fluctuations and limitations in charging, discharging, and idle driving, especially when the link voltage is within the charging or discharging voltage sections.
Innovation Solution
A DC/DC converter control method that dynamically calculates the slope of the droop control curve based on the reference voltage and required power values, allowing for active adjustment of the operation point, enabling charging, discharging, and idle driving in all voltage sections by calculating the target current value from the output power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a fixed droop control curve is used, then the control method is simple, but the operation point cannot be actively changed and response to voltage fluctuations is delayed
Solution Approach 1:
The patent applies dynamics by transitioning from a fixed droop control curve to a dynamically adjustable one. The control curve is now modified in real-time based on the relationship between link voltage and reference voltage, allowing the operation point to actively track voltage changes and eliminate response delays while maintaining operational simplicity through automated calculation.
Solution Approach 2:
The patent changes the parameter of the droop control curve (its slope) based on voltage conditions. When link voltage deviates from the reference voltage, the curve's operation point and slope are adjusted accordingly, enabling active adaptation to voltage fluctuations rather than relying on a predetermined fixed curve.
2Stability of the object's composition
If the droop control curve is fixed, then the control system is stable, but charging and discharging operations are limited when link voltage is in specific sections
Solution Approach 1:
The patent makes the droop control curve dynamic by allowing its operation point to shift based on link voltage conditions. This enables the system to adaptively perform charging, discharging, or idle operations across all voltage sections while maintaining stability through controlled, rule-based adjustments rather than arbitrary changes.
Solution Approach 2:
The patent achieves multi-functionality by enabling the DC/DC converter to perform charging, discharging, and idle operations in all link voltage sections. The adaptive droop control curve allows the system to universally handle different operational modes regardless of voltage conditions, eliminating the limitations of fixed voltage section restrictions.
3Device complexity
If power output is fixed at 0 in idle section, then the control is simple, but a non-response section is formed when voltage falls or rises
Solution Approach 1:
The patent applies dynamics by making the idle section power output variable rather than fixed at zero. When voltage fluctuations occur, the droop control curve adjusts the operation point to enable active response in the idle section, allowing the system to actively counteract voltage changes while maintaining manageable control complexity through automated adjustment.
4Ease of operation
If the operation point is fixed on a determined droop curve, then the system is easy to control, but the DC/DC converter cannot be matched with inverters of various manufacturers
Solution Approach 1:
The patent changes the droop control curve parameters (operation point and slope) based on inverter characteristics and voltage conditions. This allows the system to adapt to different inverter manufacturers and models while maintaining ease of control through automated parameter adjustment rather than requiring manual reconfiguration for each inverter type.
Data Source
AI summary
According to an embodiment, the present invention may comprise: an input unit which receives a required power value and a reference voltage value from an inverter and receives a link voltage value from a direct current link capacitor; and a control unit which calculates a slope of a droop control curve according to the reference voltage value and the required power value, calculates an output power value by substituting a difference value between the link voltage value and the reference voltage value into the slope, and calculates a target current value according to the output power value.