Short circuit ratio is currently an effective indicator for measuring the voltage support strength of AC/DC systems.However,under the premise of selecting a certain base value,the short circuit ratio is a parameter expressed only by the modulus of the system's equivalent impedance.From the equations of actual systems,it can be seen that the stability of AC/DC power systems is not only related to the modulus of Thevenin's equivalent impedance,but also closely related to the impedance phase angle,Analyzing the relationship between critical short circuit ratio and impedance ratio is of great significance for guiding new energy access engineering.This paper studies the relationship between impedance ratio,maximum transmission power,and AC system parameters,derives the relationship between critical short circuit ratio and impedance ratio,and provides guidance for using impedance ratio as an auxiliary criterion to judge the strength of the power grid in engineering.
关键词
短路比/临界短路比/新能源并网/最大功率传输
Key words
Short circuit ratio/Critical short-circuit ratio/New energy grid connection/Maximum power transmission
维普
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