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Low-Frequency Oscillation Analysis of Grid-Connected VSG System Considering Multi-Parameter Coupling
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作者 Shengyang Lu Tong Wang +6 位作者 yuanqing liang Shanshan Cheng Yupeng Cai Haixin Wang Junyou Yang Yuqiu Sui Luyu Yang 《Computer Modeling in Engineering & Sciences》 SCIE EI 2023年第6期2373-2386,共14页
With the increasing integration of new energy generation into the power system and the massive withdrawal of traditional fossil fuel generation,the power system is faced with a large number of stability problems.The p... With the increasing integration of new energy generation into the power system and the massive withdrawal of traditional fossil fuel generation,the power system is faced with a large number of stability problems.The phenomenon of low-frequency oscillation caused by lack of damping and moment of inertia is worth studying.In recent years,virtual synchronous generator(VSG)technique has been developed rapidly because it can provide considerable damping and moment of inertia.While improving the stability of the system,it also inevitably causes the problem of active power oscillation,especially the low mutual damping between the VSG and the power grid will make the oscillation more severe.The traditional time-domain state-space method cannot reflect the interaction among state variables and study the interaction between different nodes and branches of the power grid.In this paper,a frequency-domain method for analyzing low-frequency oscillations considering VSG parameter coupling is proposed.First,based on the rotor motion equation of the synchronous generator(SG),a secondorder VSG model and linearized power-frequency control loop model are established.Then,the differences and connections between the coupling of key VSG parameters and low-frequency oscillation characteristics are studied through frequency domain analysis.The path and influencemechanism of a VSG during low-frequency power grid oscillations are illustrated.Finally,the correctness of the theoretical analysis model is verified by simulation. 展开更多
关键词 Inverter power supply low-frequency oscillation virtual synchronous generator rotor motor equation
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