Analysis of the Impact of Voltage Control on the Frequency Response Characteristics of Grid-Forming Converter
The virtual synchronous generator section of a grid-forming converter is the most important factor affecting its frequency dynamics,but the frequency of the internal voltage within a grid-forming converter does not only include the frequency of the virtual synchronous generator.To address this point of view,a research approach is proposed to characterize the effect of voltage control in influencing the frequency dynamics of grid-forming converter.Firstly,analogous to the frequency analysis method of the synchronous generator,the concept of the internal voltage of the grid-forming converter is proposed,and the frequency of the converter are characterized by the frequency of the internal voltage.Then the effect of the AC voltage control on the frequency dynamics in response to the active power perturbation within the electromechanical time scale is analyzed through the method of the motion equation modeling,and the influence trends of the voltage control parameter on the active power and the frequency response capability of the grid-forming converter are analyzed.It is found that larger voltage control proportional and integration parameters deteriorate the system frequency dynamics,but the response performance of the converter is mainly determined by the virtual synchronous generator.The simulations in MATLAB/Simulink with a 3-machine 9-node system and a real-world regional grid system verify the effectiveness of the method respectively.
grid-forming convertervirtual synchronous generatorAC voltage controlmotion equationfrequency responseac-tive power provision
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