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The replacement of traditional synchronous generators by renewable energy generation has made the issue of voltage stability increasingly prominent. Based on the basic principle of PU curve for static voltage stability analysis, this paper studies the mechanism of renewable energy generation equipment's influence on static voltage stability, analyzes and extracts the leading influencing factors, that is, the load power factor and the equivalent impedance on the transmission path. Specifically, the influence of renewable energy generation on static voltage stability is studied for the two situations that renewable energy power generation does not participate in voltage regulation and participates in voltage regulation. Considering the dynamic characteristics of renewable energy generation, this paper proposes a more practical static voltage stability that is closer to the actual situation. The dynamic characteristics of renewable energy generation mainly refer to its overcurrent capability limitation and switching control logic. Finally, the analysis results of this paper are verified by the simulation of an IEEE standard example.
Inspec keywords: power grids; power system stability; voltage control; power factor; renewable energy sources; power system simulation; IEEE standards
Subjects: Power system management, operation and economics; Control of electric power systems; Energy resources; Stability in control theory; Voltage control; Power system control