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Related Experiment Video

Updated: Jun 28, 2025

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

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

Published on: February 14, 2025

A current reference-enhanced strategy endows the GFC in DC microgrids better dynamic response.

Wenqiang Xie¹, Xian Zheng², Mingming Shi²

¹State Grid Jiangsu Electric Power Co. LTD. Research Institute, Nanjing, 211100, China. bjxiewenqiang@163.com.

Scientific Reports

|April 13, 2024

Summary

A new non-integrator disturbance observer-based (NIDOB) strategy improves DC microgrid voltage control. This method enhances dynamic performance and transient response without increasing system bandwidth or introducing noise.

Keywords:

Current reference enhancement DC microgrids Dynamic performance Load disturbances Non-integrator control

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Area of Science:

Electrical Engineering
Power Systems
Control Theory

Background:

Constant Voltage Strategy (CVS) is suitable for small-capacity DC microgrids but suffers from slow dynamic performance due to integrator lag and load step disturbances.
Existing advanced methods to improve dynamic performance often increase system bandwidth, which is limited by the switching frequency and can introduce noise.

Purpose of the Study:

To develop a novel control strategy that accelerates transient response and eliminates integrator influence in DC microgrids.
To enhance the gain within the system bandwidth without compromising noise levels.

Main Methods:

Proposed a non-integrator disturbance observer-based (NIDOB) strategy for DC microgrid voltage control.
The NIDOB strategy feeds load current into the current reference, replacing the integrator's output.
Compared NIDOB against traditional and non-integrator directly-feedforward (NIDF) strategies, as well as bandwidth-increased methods.

Main Results:

The NIDOB strategy demonstrated superior dynamic performance compared to traditional and NIDF strategies.
NIDOB achieved better dynamic performance than bandwidth-increased strategies without introducing additional noise.
Theoretical analysis and experimental results validated the advantages of the proposed NIDOB strategy.

Conclusions:

The non-integrator disturbance observer-based (NIDOB) strategy offers an effective solution for improving DC microgrid voltage control dynamics.
NIDOB enhances transient response and eliminates integrator-induced sluggishness, providing a robust alternative to existing methods.