Abstract
Aiming at the low frequency oscillation and voltage drop caused by the wind-thermal bundled system transmitted to the load center across AC and DC lines, an adaptive sliding mode gain control method based on the structure decentralized control theory is proposed. On the basis of this method, a rotor-side adaptive terminal sliding mode controller for doubly-fed induction generator based on synchronous rotating coordinate system is designed. Based on RTDS, a real-time simulation platform for transient stability control of “wind-thermal bundled” transmission system was developed, and real-time simulation experiments were performed. Experimental results prove that the proposed method in this paper can effectively suppresses the frequency and voltage fluctuations of the system, significantly improve the transient stability of the system and enhance the robustness of the system during grid faults.
Highlights
When wind energy resources are concentrated in remote areas far away from the power load center, wind power cannot be integrated well
Based on the grid-connected operation model of the wind-fire bundling AC / DC transmission system, this paper proposes a variable gain sliding mode additional control strategy for the rotor flux linkage of the doubly-fed wind power generator set to improve the transient stability of the grid-connected voltage and frequency of the doubly-fed wind farm
Aiming at the transient stability of the voltage and frequency of the wind-fired AC / DC transmission system, this paper proposes an adaptive terminal sliding mode control algorithm based on the rotor flux linkage of the double-fed wind farm aimed at enhancing the transient stability of the voltage and frequency
Summary
When wind energy resources are concentrated in remote areas far away from the power load center, wind power cannot be integrated well. It is possible to use the AC-DC parallel-connected transmission line based on VSC-HVDC to transmit power [2], which will be the most common operation mode for windthermal bundled power transmission in the future In this way, the characteristics of conventional thermal power stations that can regulate frequency and voltage can be fully utilized, and the fluctuation of output power of the wind farm can be effectively mitigated. Based on the grid-connected operation model of the wind-fire bundling AC / DC transmission system, this paper proposes a variable gain sliding mode additional control strategy for the rotor flux linkage of the doubly-fed wind power generator set to improve the transient stability of the grid-connected voltage and frequency of the doubly-fed wind farm.
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