中国电机工程学报2023，Vol.43Issue(23)：9114-9126,13.DOI:10.13334/j.0258-8013.pcsee.221236
外环限幅对VSC并网系统大扰动稳定性的影响研究
Research on the Large Disturbance Stability of Grid-connected VSC System Considering the Limiter Strategy of Outer Loop
摘要
Abstract
The proportion of renewable energy generation with voltage source converter(VSC)as the interface is increasing.The existing researches only focus on the characteristics of the phase-locked loop(PLL)and other control loops while ignoring the influence of nonlinear loops such as limiter on the stability.To fill the gap,the effect of the VSC outer loop and its limiter on the large disturbance stability is of the main interest in this paper.Firstly,a simplified grid-connected VSC system is established to analyze the existence of equilibrium points,which takes the electrical quantity constrained by the limiter as the state variable.Secondly,based on the Poincaré theorem and Lyapunov's second theorem,the deterministic condition of the fixed point is proved,which is a fixed position away from the outer loop limiter.The mechanism that the actual power is inconsistent with the command value under the large disturbance is revealed.Then,the limiter principle considering safety and stability is proposed,and based on this,the improved limiter strategy is designed.Finally,the analysis results based on the actual model show that a reasonable outer loop limiter can improve the stability of the grid-connected VSC system.关键词
VSC并网系统/大扰动稳定性/外环限幅/固定切出点:改进限幅策略Key words
grid-connected VSC system/large disturbance stability/outer loop limiter/the fixed point/improved limiter strategy分类
信息技术与安全科学引用本文复制引用
王一鸣,孙华东,徐式蕴,沈沉,毕经天,刘新元..外环限幅对VSC并网系统大扰动稳定性的影响研究[J].中国电机工程学报,2023,43(23):9114-9126,13.基金项目
国家电网有限公司总部科技项目:高比例新能源电力系统大扰动稳定特性及失稳判别理论研究(5100-202055389A-0-0-00).Supported by the Science and Technology Project of State Grid Corporation of China:Large Disturbance Stability Characteristics and Determination for Power System With High Penetration of Renewable Energy Generation(5100-202055389A-0-0-00). （5100-202055389A-0-0-00）
