The Small-Signal Stability Analysis of the Droop-Controlled Converter in Electromagnetic Timescale

By Rui Wang, Qiuye Sun, Dazhong Ma, Zhenwei Liu. IEEE Transactions on Sustainable Energy, 2019

165 citations recorded by the source corpus.

Recently, the converters controlled by droop controller with phase-locked loop were observed in islanded ac microgrids. However, only the state-space-based approach was applied to investigate the stability of this converter in the previous works. Compared with the state-space-based approach, the characteristic equation approach has plenty of advantages, such as convenient stability margin analysis (phase margin, gain margin, etc.) and simple stability criterion (Routh criterion). Thus, a novel small-signal modeling approach based on characteristic equation for converter-dominated ac microgrids is proposed to assess the system low-frequency stability in this paper. First, considering zero-order holder and time delay, the small-signal characteristic equation of this converter is presented by Padé approximation and dynamic phasor model. Furthermore, the implementation and parameter design of the converters are studied under the practical considerations. Compared with the existing characteristic equation methods, the proposed approach can verify that the performance is significantly improved. Eventually, simulations and experimental results are presented, indicating that the proposed approach can assess the system low-frequency stability conveniently and accurately.

Subfields: Control and Systems Engineering, Electrical and Electronic Engineering

View Paper: https://www.semanticscholar.org/paper/2860f8924ace57a00f0d97268a615e4ec45b5b62

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Control and Systems Engineering

1. Peng Wang
2. Qiuye Sun
3. Rui Wang
4. Dazhong Ma

In Electrical and Electronic Engineering

1. Peng Wang
2. Qiuye Sun
3. Rui Wang
4. Dazhong Ma

Citations in the corpus

• SoC-Based Droop Coefficients Stability Region Analysis of the Battery for Stand-Alone Supply Systems With Constant Power Loads (2021, background): “Traditionally, the conservative stability criterion is to obtain the analytical condition, such as phase margin, gain margin, and σ margin [2].”