What is it about?

This research explores how to improve the control of a particular kind of power supply that's widely used in industries, especially when it's working in a high-power situation. When multiple power supply units work together in what's called Input-Parallel Output-Parallel (IPOP) mode, there are often problems like slow response of the output voltage and large "ripples" (undesired fluctuations) which can be problematic in specific applications like electrophoresis and electroplating. We introduce an enhanced Adaptive Linear Active Disturbance Rejection Control (A-LADRC) technique that tweaks the system’s controls for a faster voltage response. To address the ripple, one control strategy we use adjusts the duty cycle of a single unit based on feedback, while another strategy for when multiple units are used together ensures the units' peaks and valleys counterbalance each other. We tested our methods on a 42V/12000A high-power DC supply, finding that our approach effectively sped up the system’s voltage response and reduced ripple, indicating promising practical and industrial applications.

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Why is it important?

This work is vital due to the widespread use of three-phase isolated AC-DC-DC power supplies in various industrial applications, particularly those requiring high-power. The paper not only addresses, but also proposes viable solutions to significant issues of slow output voltage response and large voltage ripples, which are pivotal in ensuring optimal operational efficiency in specific applications. This enhancement in control strategies not only ensures a more stable and reliable power supply but also broadens the application scope of high-power DC supplies by making them apt for applications that are sensitive to voltage variations and ripples, such as in precise manufacturing processes. By achieving improved output voltage response and minimized ripples, this research stands to contribute substantially to the field, promoting technological advancements in industrial power supply management and related applications.

Perspectives

Navigating through the complexities of controlling high-power DC supplies, especially in IPOP mode, has unveiled intricate details and deep insights into the functioning and potential improvement areas within industrial power systems. Creating a control strategy that not only enhances output voltage response but also effectively mitigates ripple was a nuanced challenge, blending theoretical constructs with practical applicability. Witnessing the actualization of the proposed control strategies, and observing their effectiveness in a real-world 42V/12000A high-power DC supply, has been an enriching experience, cementing the belief in continuous exploration and innovation in the field. This journey, while technically intricate, underscored the significant impact that refined control strategies can impart in the domain of high-power industrial applications, ushering in enhanced reliability and operational precision.

Professor/PhD Supervisor/SMIEEE Yang Li
Northeast Electric Power University

Read the Original

This page is a summary of: Output Voltage Response Improvement and Ripple Reduction Control for Input-Parallel Output-Parallel High-Power DC Supply, IEEE Transactions on Power Electronics, September 2023, Institute of Electrical & Electronics Engineers (IEEE),
DOI: 10.1109/tpel.2023.3290590.
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