Research on Synchronization Control of Distributed Generation Based on Second-Order Unified Model

doi:10.11930/j.issn.1004-9649.202305133

Abstract

Abstract:

The existing grid connection controls of distributed generation inverters are mainly classified into the grid-following (GFL) control and the grid-forming (GFM) control. In this paper, with the multi-timescale separation method, the second-order unified models of GFL and GFM synchronization control are established. Based on the unified models, the small-signal stabilities of GFL and GFM control are analyzed, pointing that GFL control is compatible with strong grid, while weak grid can improve the damping ratio of GFM control. Besides, the transient stabilities of GFL and GFM are analyzed, and a general stability-enhanced method is proposed to enhance the synchronization stability. Finally, these findings are corroborated by experimental tests.

Key words: distributed generation, transient stability, grid-following control, grid-forming control

Yan HUANG, Yingpeng HAO, Huixian WANG, Longye ZHENG, Kaizhe ZHANG, Yinliang XU. Research on Synchronization Control of Distributed Generation Based on Second-Order Unified Model[J]. Electric Power, 2023, 56(12): 41-50.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202305133

https://www.electricpower.com.cn/EN/Y2023/V56/I12/41

Figures/Tables 10

Fig.1 Circuit and control diagram of GFL control

Fig.2 Control diagrams of GFM synchronization

Fig.3 Sine curves of ${v_{{\text{pcc}}q}}-\tilde \theta $

Fig.4 Power angle curves of GFM control

Fig.5 RT-LAB-based hardware-in-loop platform

Fig.6 Validation results of small-signal second-order unified model.

Fig.7 Simulation results for GFL control.

Fig.8 Simulation results for GFM control.

Fig.9 Simulation results of the proposed GFM control under voltage sag fault.

Fig.10 Simulation results of the control method in Reference [3] under voltage sag fault.

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