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Updated: Sep 12, 2025

Experimental Investigation of the Hierarchical Control in DC Microgrids Using a Real-time Simulator
06:04

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Impedance shaping based stabilization control method for DC Micro-grid Feed-forward compensation.

Xiaojuan Zhang1,2, Bo Jing3, Yuan Wang4

  • 1College of Mechanical Engineering, Xijing University, Xi'an, China. hansi-321@163.com.

Scientific Reports
|August 8, 2025
PubMed
Summary
This summary is machine-generated.

A new feed-forward control method stabilizes DC microgrids by shaping energy storage unit impedance. This method prevents oscillation instability during charging, ensuring reliable system operation and minimal voltage deviations.

Keywords:
Constant power unitFeed-forward compensationImpedance shapingNegative impedance characteristicsStability

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Area of Science:

  • Electrical Engineering
  • Control Systems
  • Power Electronics

Background:

  • Bi-directional converters in DC microgrids exhibit negative impedance during charging.
  • This negative impedance characteristic can reduce system stability and cause oscillation instability.
  • Existing methods may not sufficiently address stability issues in DC microgrid energy storage.

Purpose of the Study:

  • To propose and validate a novel feed-forward compensation control method for enhancing DC microgrid stability.
  • To mitigate oscillation instability caused by negative impedance characteristics of energy storage units during charging.
  • To ensure stable system operation and minimize steady-state voltage deviation in DC microgrids.

Main Methods:

  • Implementing a feed-forward compensation control strategy based on impedance shaping.
  • Designing a transfer function within the current feed-forward loop to ensure bus voltage following.
  • Selecting an appropriate time constant to achieve desired port impedance characteristics (positive resistive near oscillation frequency, negative at low frequency).

Main Results:

  • The proposed control method effectively reshapes the port impedance of the energy storage unit.
  • Simulations and semi-physical tests confirmed enhanced system stability margins.
  • Stable system operation with minimal steady-state voltage deviation was achieved.

Conclusions:

  • The feed-forward compensation control method successfully addresses negative impedance issues in DC microgrid charging.
  • The approach ensures system stability and improves overall performance.
  • This method offers a viable solution for stable energy storage integration in DC microgrids.