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Energies 2017, 10(8), 1146; https://doi.org/10.3390/en10081146

Virtual Synchronous Generator Based Auxiliary Damping Control Design for the Power System with Renewable Generation

1
School of Electrical Engineering, Southeast University, Nanjing 210096, China
2
State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems, China Electric Power Research Institute, Nanjing 210003, China
3
Qinghai Province Key Laboratory of Photovoltaic Grid Connected Power Generation Technology, State Grid Qinghai Electric Power Research Institute, Xining 810008, China
*
Author to whom correspondence should be addressed.
Received: 27 June 2017 / Revised: 29 July 2017 / Accepted: 31 July 2017 / Published: 4 August 2017
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Abstract

Aiming for large-scale renewable energy sources (RES) integrated to power systems with power electronic devices, the technology of virtual synchronous generator (VSG) has been developed and studied in recent years. It is necessary to analyze the damping characteristics of the power system with RES generation based on VSG and develop its corresponding damping controller to suppress the possible low frequency oscillation. Firstly, the mathematical model of VSG in a per unit (p.u) system is presented. Based on the single-machine infinite bus system integrated with an RES power plant, the influence of VSG on the damping characteristics of the power system is studied qualitatively by damping torque analysis. Furthermore, the small-signal model of the considered system is established and the damping ratio of the system is studied quantitatively by eigenvalue analysis, which concluded that adjusting the key control parameters has limited impacts on the damping ratio of the system. Consequently, referring to the configuration of traditional power system stabilizer (PSS), an auxiliary damping controller (ADC) for VSG is designed to suppress the low frequency oscillation of the power system. Finally, simulations were performed to verify the validity of theoretical analysis and the effectiveness of designed ADC. View Full-Text
Keywords: renewable energy sources; virtual synchronous generator; auxiliary damping controller; small-signal model; eigenvalue analysis renewable energy sources; virtual synchronous generator; auxiliary damping controller; small-signal model; eigenvalue analysis
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Gao, B.; Xia, C.; Chen, N.; Cheema, K.M.; Yang, L.; Li, C. Virtual Synchronous Generator Based Auxiliary Damping Control Design for the Power System with Renewable Generation. Energies 2017, 10, 1146.

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