Abstract
This paper proposes a generalized design method of extended state observer (ESO) based nonsingular terminal sliding mode (NTSM) control for voltage source converter (VSC) station. The non-linear loads and external disturbances and parameter perturbations of the converter station are considered as external disturbances which are bounded. The ESO is designed to reject the external disturbances which include not only the unmeasured system states but also the modeling uncertainties. At the same time, the non-singular terminal sliding mode control method based on ESO is proposed to solve the problems of slow dynamic response of output voltage and high waveform distortion rate in converter station. The proposed control method is validated through numerical simulation shows a closed-loop dynamics and better transient performance, and the controller can effectively suppress the differential peak values of active power, reactive power and DC voltage in the initial stage of system start-up. Under conditions of non-singularity of the controller, the influence of system disturbances in the chattering of the controller is effectively eliminated and the robust performance of the system is enhanced.
Highlights
W ITH the rapid development of new energy, in the solution of new energy grid-connected scheme, voltage source converter based multi-terminal HVDC transmission system(VSC-MTDC) which developed from two-terminal
As an important part of VSC-MTDC system, converter station needs to control the stability of its own DC voltage and active power transmission, and needs to realize coordinated control between them
The non-singular terminal sliding mode (NTSM) control method based on extended state observer (ESO) is proposed to solve the problems of slow dynamic response of output voltage and high waveform distortion rate in converter station
Summary
W ITH the rapid development of new energy, in the solution of new energy grid-connected scheme, voltage source converter based multi-terminal HVDC transmission system(VSC-MTDC) which developed from two-terminal [1]. The non-singular terminal sliding mode (NTSM) control method based on ESO is proposed to solve the problems of slow dynamic response of output voltage and high waveform distortion rate in converter station. Parametric uncertainties, i.e. smoothing inductor L, parasitic phase resistance R, and the angular frequency of the grid ω, are fully considered and included into the model, so the control robustness is guaranteed L0,R0, and ω0 are the nominal values and∆L,∆R , and ∆ω are the parametric uncertainties that can be considered as unknown slow variant signals.The control objectives for three-phase grid-connected power converters are as follows. EXTENDED STATE OBSERVER DESIGN FOR THE CONVERTER STATION In three-phase grid-connected power converters, there are different kinds of disturbances, such as parameter uncertainties and load variations. The sliding mode controller is designed by using the corrected error which can compensate the disturbance of the system and enhance the robustness of the system
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