Abstract
This study focuses on the dynamics of a grid-tied voltage source converter (GVSC) during electromechanical oscillations. A small-signal model with GVSC port variables (DC voltage and AC power) as the outputs and a terminal voltage vector as the input is derived to reveal the passive response of the GVSC on the basis of the power equation in the d–q coordinate system. An input–output transfer function matrix is constructed according to the proposed model. The frequency response of this matrix in the electromechanical bandwidth is described to reflect the dynamic behavior of the GVSC. The effects of the operation parameters, i.e., the grid strength, reference value of the control system, and grid voltage, on the dynamic behavior of the GVSC in the electromechanical bandwidth, are investigated using frequency domain sensitivity. Analysis results show that the GVSC generates responses with respect to the electromechanical mode. These responses have different sensitivities to the operation parameters. The IEEE 10-machine power system simulation is performed, and the power hardware-in-the-loop platform with the GVSC was applied to validate the analysis.
Highlights
The proportion of grid-tied voltage source converters (GVSCs) in the power grid has been expanding with the increases in renewable power generation capacity and voltage source converter-based high-voltage direct current [1,2]
According to the dynamic system scale and model order, the calculation methods of the frequency domain sensitivity function can be divided into the direct method based on the transfer function and the indirect method based on the Fourier transform (FT)
Driven by the electromechanical behavior of the power system, the GVSC generates the same mode oscillation as an electromechanical oscillations (EOs), which can be observed by the DC voltage and AC power of the GVSC, especially the reactive power
Summary
The proportion of grid-tied voltage source converters (GVSCs) in the power grid has been expanding with the increases in renewable power generation capacity and voltage source converter-based high-voltage direct current [1,2]. GVSCs and the grid are important in suppressing EOs. With reference to the analysis of synchronous machines, a small signal model of a GVSC is deduced in the frequency domain on the basis of the dynamic equation in the d–q coordinate using a single-machine infinite system as the scene [8,9,10]. With reference to the analysis of synchronous machines, a small signal model of a GVSC is deduced in the frequency domain on the basis of the dynamic equation in the d–q coordinate using a single-machine infinite system as the scene [8,9,10] This model takes the DC voltage and the difference between the reference and feedback values as the inputs and the current and voltage as the outputs.
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
