并网变换器的暂态同步稳定性研究综述

Transient Synchronization Stability Analysis of Voltage Source Converters: A Review

随着可再生能源渗透率的提高,并网变换器对系统动态及稳定性的影响逐渐突显出来,如目前广泛讨论的低惯性和宽频振荡问题等。该文探讨与并网变换器同步环节非线性动态紧密相关的暂态同步稳定问题。首先分析并网变换器与同步机在同步机制方面的相似性,揭示了变换器的暂态同步稳定性与同步机的功角稳定性在研究方法上的内在联系;其次针对当前变换器的暂态同步稳定性研究,从失稳机理、研究方法、镇定方法 3个方面展开全面的综述;接着总结了暂态同步稳定性研究所面临的难点,探讨了暂态同步的致稳方法,展望了未来的研究方向。该文全面地梳理和总结了并网变换器暂态同步稳定性问题的研究成果和一般性方法,为解决工程问题和未来更深入的研究提供了借鉴和思考。

With the increase of the penetration of renewable energy, the influence of grid connected converter on the dynamic and stability of the power grid is becoming severe, such as low inertia and wide-band oscillation. This paper discussed the problem of transient synchronization stability(TSS) which is closely related to the nonlinear dynamics of the synchronization unit of the converters. Firstly, the inherent relationship between the TSS of the VSC and angle stability of synchronous generator(SG) had been revealed by investigating the similarity of synchronization mechanism between VSC and SG. Secondly, the instability mechanism, analysis method and stabilization control regarding the TSS issue had been comprehensively reviewed. Thirdly, the challenge of TSS studying was summarized, the generally application-oriented stabilization method was proposed, and further synchronization issue for future research was prospected. The general method of TSS is concluded in this paper, which provides reference to applications and future research.