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Related Experiment Video

Updated: Sep 9, 2025

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

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Published on: February 14, 2025

Adaptive Virtual Impedance Droop Control of Parallel Inverters for Islanded Microgrids.

Hongzhi Yang¹, Zibo Sun¹, Haoran Wang¹

¹Institute of Automation, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250000, China.

Sensors (Basel, Switzerland)

|August 28, 2025

Summary

This study introduces an adaptive droop control for inverters, improving reactive power sharing in microgrids without communication. The method enhances stability by addressing impedance mismatches and measurement errors.

Keywords:

adaptive virtual impedance droop control parallel inverters power sharing

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Area of Science:

Electrical Engineering
Power Systems
Control Theory

Background:

Droop control is vital for parallel inverter operation but suffers from reactive power imbalance and circulating currents in microgrids due to impedance mismatches and measurement errors.
Existing methods often require communication, which is not always feasible in microgrid environments.

Purpose of the Study:

To propose a communication-free adaptive droop control strategy for enhanced reactive power sharing in microgrids.
To address challenges posed by line impedance mismatches and measurement inaccuracies in inverter-based microgrids.

Main Methods:

Developed an Adaptive Virtual Impedance Droop Control (AVIDC) mechanism utilizing only local measurements from each inverter.
Integrated the deviation between the ratio of reactive power to output voltage and its reference value into the control strategy.
Employed simulation and experimental validation to assess the control strategy's performance.

Main Results:

The proposed AVIDC method effectively balances reactive power output and voltage drop dynamically.
Demonstrated significant improvement in the accuracy of reactive power sharing among inverters.
Validated the elimination of the need for inter-inverter communication.

Conclusions:

The adaptive droop control strategy offers a robust and effective solution for accurate reactive power sharing in microgrids.
The AVIDC mechanism enhances microgrid stability and reliability by mitigating circulating currents and power imbalances.
This communication-free approach is suitable for practical microgrid implementations.