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Related Experiment Video

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

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Dynamic Network Characteristics of Power-electronics-based Power Systems.

Yuxi Ji¹, Wei He¹, Shijie Cheng¹

¹The State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China.

Scientific Reports

|June 21, 2020

Summary

Traditional power flow analysis is insufficient for power-electronics-dominant systems. This study introduces dynamic power flow, revealing a new relationship between instantaneous powers and voltage vectors for improved analysis.

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Area of Science:

Electrical Engineering
Power Systems Analysis
Renewable Energy Integration

Background:

Traditional power flow studies rely on quasi-stationary approximations, which are inadequate for modern power systems with high penetration of power electronics.
The fast dynamics of converters in renewable energy sources significantly alter system behavior, necessitating a reevaluation of existing analysis methods.
Power-electronics-dominant systems exhibit complex dynamical behaviors that are not fully understood with current analytical tools.

Purpose of the Study:

To develop a novel concept of dynamic power flow for a more accurate description of power-electronics-dominant network characteristics.
To uncover an explicit dynamic relationship between instantaneous powers and voltage vectors in these evolving power systems.
To provide a better understanding of the dynamical nature of power-electronic-dominant power systems.

Main Methods:

Development of a new dynamic power flow concept.
Derivation of an explicit mathematical relation between instantaneous powers and voltage vectors.
Verification through simulations including transient analysis of a power-electronics-based system and small-signal stability analysis of a voltage source converter.

Main Results:

A novel dynamic power flow concept has been successfully developed.
An explicit dynamic relationship between instantaneous powers and voltage vectors was uncovered and mathematically formulated.
Simulations confirmed the validity of the proposed dynamic power flow method for transient and stability analyses.

Conclusions:

The proposed dynamic power flow method accurately describes network characteristics in power-electronics-dominant systems.
The new mathematical relation provides improved insights into the behavior of these systems.
The findings enhance the understanding of the dynamical nature of modern, converter-interfaced power systems.