Impedance modeling and analysis of voltage‐source converter‐based high‐voltage direct current system for grid‐connected wind farm. (4th April 2022)

• Record Type: Journal Article
• Authors: Cao, Zequan; Dong, Xiaoliang; Hu, Sile; Yu, Sam S.; Liu, Bin; Li, Zhen; Liu, Xiangdong
• Is Part Of: International journal of circuit theory and applications. Volume 50:Number 8(2022)
• Page Start: 2759
• Page End: 2776
• Publication Date: 2022-04-04
• Subjects: PSO -- sub‐synchronous oscillation -- sequence impedance modeling -- VSC‐HVDC -- wind power; Electric circuit analysis -- Periodicals; 621.319205
• DOI: 10.1002/cta.3278
• Languages: English
• ISSNs: 0098-9886

Abstract

Summary: Oscillation issues of the gird‐connected offshore wind farm through the voltage‐source converter‐based high‐voltage direct current (VSC‐HVDC) have serios influence on the grid stability. However, in the previous modeling and analysis for the VSC‐HVDC system, the receiving‐end inverter station is usually considered as a constant voltage source, neglecting the impact of the inverter and AC grid. In addition, the commonly used mitigation method by modifying control parameters usually does not consider its influence on the controller's control performance. To analyze the system stability more rigorously and suppress the oscillation effectively, in this work, we firstly establish a detailed impedance model of VSC‐HVDC considering the inverter station and DC transmission line, based on which the stability analysis is also presented. Furthermore, an oscillation suppression method based on intelligent impedance optimization is proposed, which is solved by Particle swarm optimization (PSO) algorithm. The proposed impedance optimization method can achieve the maximum stability margin while the transient dynamic performance is still guaranteed, thereby suppressing the oscillation of the system. Simulations are conducted in PSCAD/EMTDC to validate the accuracy and effectiveness of the proposed modeling and suppression method. Abstract : Based on the sequence impedance modeling method, a detailed analytical model of voltage‐source converter‐based high‐voltage direct current (VSC‐HVDC) is established in this paper. It's concluded that the negligence of the inverter station model will significantly undermine the accuracy of stability analysis. A new intelligent impedance optimization method is proposed to achieve the maximum stability margin while the transient dynamic performance is guaranteed.