Phase-Angle Stability Analysis of Microgrids in Electromagnetic Time Scale

doi:10.3969/j.issn.1000-7229.2019.09.012

Abstract

Abstract: With the large-scale integration of distributed renewable energy into power grid， synchronous oscillation and harmonic instability have attracted more and more attention. Compared with the traditional power system， the microgrid has plenty of characteristics， such as negative impedance， low inertia， negative damping and bidirectional power flow. Consequently， this paper proposes a phase stability analysis method based on small-signal modeling in electromagnetic time scale. Firstly， the small-signal modeling of power converter is established， and the phase stability of power converter is obtained by the inherent relationship between system phase angle and reactive power of distributed generation. Furthermore， the closed-loop transfer function of the power converter is established， and the phase stability region is obtained through eigenvalue analysis. Eventually， the proposed phase angle stability method in electromagnetic time scale is verified by simulation and experiment results.

Key words: distributed renewable energy source, electromagnetic time scale, small signal analysis, phase angle stability

CLC Number:

TM 712

WANG Rui， SUN Qiuye， ZHANG Xuemeng， MA Dazhong. Phase-Angle Stability Analysis of Microgrids in Electromagnetic Time Scale[J]. Electric Power Construction, 2019, 40(9): 99-106.

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