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.
Highlights
The power system may experience sustained low frequency oscillation in the transmission lines after being disturbed due to the lack of damping [1,2]
The single-machine infinite bus system integrated with the renewable energy sources (RES) power plant shown in Figure 3 is modeled in Matlab/Simulink
The key parameters are the same as that used in the eigenvalue analysis, which are listed in Tables 1 and 2
Summary
The power system may experience sustained low frequency oscillation in the transmission lines after being disturbed due to the lack of damping [1,2]. The virtual synchronous generator (VSG), which represents the voltage source converter operated in a similar way as the synchronous generator [8,9], is regarded as a promising method of friendly integration of RES generation This strategy has been widely used in the field of micro-grid inverter [10,11], wind and photovoltaic power generation [12,13], low frequency AC transmission (LFAC) [14] as well as high voltage direct current (HVDC) [15,16], and achieves a good control effect.
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