Transient Angle Stability of Virtual Synchronous Generators Using Lyapunov's Direct Method

With an increasing number of distributed energy resources integrated into the power system, inverters need to take on the corresponding responsibility for the security and stability of the system. Virtual synchronous generators (VSGs) are proposed to mimic dynamic characteristics of traditional rota...

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Bibliographic Details
Published in:IEEE transactions on smart grid 2019-07, Vol.10 (4), p.4648-4661
Main Authors: Shuai, Zhikang, Shen, Chao, Liu, Xuan, Li, Zuyi, Shen, Z. John
Format: Article
Language:English
Subjects:
Computer simulation
Control stability
Distributed generation
Dynamic characteristics
Electric potential
Energy sources
Generators
Inverters
Liapunov direct method
Lyapunov’s direct method
Parameters
Power control
Power system stability
Reactive power
Reactive power control
reactive power control loop
Reserve capacity
Security
Stability
Stability analysis
Stability criteria
State variable
Transient analysis
transient angle stability
Virtual synchronous generator
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Summary:With an increasing number of distributed energy resources integrated into the power system, inverters need to take on the corresponding responsibility for the security and stability of the system. Virtual synchronous generators (VSGs) are proposed to mimic dynamic characteristics of traditional rotational synchronous generators (RSGs) to compensate for the loss of inertia and reserve capacity. Similar to RSGs, VSGs will experience transient angle instability under certain conditions, which likely threatens the system security. In this paper, transient angle stability of a VSG is investigated by Lyapunov's direct method. The deteriorative effect of reactive power control loop on transient angle stability is first analyzed and then voltage variation is incorporated into an approximate Lyapunov's direct method. In this method, the inverter internal voltage is treated as a parameter rather than a state variable. Moreover, the influence of different parameters on transient angle stability is studied. Finally, an enhanced control strategy is presented to improve the transient angle stability by adjusting the reference power. Numerical simulation results are presented to validate the effectiveness of the proposed method and the enhanced control.
ISSN:1949-3053
1949-3061
DOI:10.1109/TSG.2018.2866122