Influence of Inverter Parameters Based on Droop Control on Microgrid Stability

doi:10.3969/j.issn.1000-7229.2018.08.015

Abstract

Abstract: As we all know, microgrid has a strong acceptance of new energy. Droop control is the hotspot technology to realize the coordinated operation of power supply in island microgrid, which can best embody the “plug and play” characteristic of distributed generators （DG）. However, most research in this field is focused on the network topology, while ignoring the inverters internal control structure to some extent. From the droop control strategy used in the inverter, first of all, on the basis of in-depth study of the internal structure, the paper establishes a full-structure small-signal function model. Next, the effect of the change of controller parameters （droop coefficient and voltage loop coefficient） on the system stability is analyzed quantificationally via a case. And then, the range of control parameters is determined by the root locus method to provide selection reference for the inverters. Finally, time domain simulation is used to show the effectiveness of the model and the practicability of the analysis method. The results are also proved to satisfy the stable operation and dynamic characteristics of the microgrid.

Key words: droop control, inverter, small signal model, control parameter configuration, microgrid stability

CLC Number:

TM 73

LIANG Haifeng，DONG Yue，ZHENG Can. Influence of Inverter Parameters Based on Droop Control on Microgrid Stability[J]. Electric Power Construction, 2018, 39(8): 119-127.

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