The admittance is a strong tool for stability analysis and assessment of the three-phase voltage source converters(VSCs) especially in grid-connected mode.However, the sequence admittance is hard to calculate when the...The admittance is a strong tool for stability analysis and assessment of the three-phase voltage source converters(VSCs) especially in grid-connected mode.However, the sequence admittance is hard to calculate when the VSC is operating under unbalanced grid voltage conditions. In this paper, a simple and direct modeling method is proposed for a three-phase VSC taking the unbalanced grid voltage as a new variable for the system.Then coupling in the three-phase system can be calculated by applying the harmonic linearization method. The calculated admittance of three-phase VSCs is verified by detailed circuit simulations.展开更多
就目前的研究来说,隐藏吸引子是一个比较新颖的课题,而研究动力系统中隐藏吸引子的存在性问题是一项重要的研究课题。通过建立一个新颖的非线性Van Der Pol-Duffing振子模型,运用一项新的研究方法,即分析-数值方法,从而研究非线性动力...就目前的研究来说,隐藏吸引子是一个比较新颖的课题,而研究动力系统中隐藏吸引子的存在性问题是一项重要的研究课题。通过建立一个新颖的非线性Van Der Pol-Duffing振子模型,运用一项新的研究方法,即分析-数值方法,从而研究非线性动力系统中隐藏吸引子的存在性问题。基于经典的动力系统Hopf分支理论,根据Routh-Hurwitz判据讨论平衡点的稳定性,利用谐波线性化方法和分析-数值方法,分析并验证隐藏吸引子的存在性,最后通过数值模拟定位出隐藏吸引子。展开更多
基金supported by National Natural Science Foundation of China(No.51637007,No.51507118)
文摘The admittance is a strong tool for stability analysis and assessment of the three-phase voltage source converters(VSCs) especially in grid-connected mode.However, the sequence admittance is hard to calculate when the VSC is operating under unbalanced grid voltage conditions. In this paper, a simple and direct modeling method is proposed for a three-phase VSC taking the unbalanced grid voltage as a new variable for the system.Then coupling in the three-phase system can be calculated by applying the harmonic linearization method. The calculated admittance of three-phase VSCs is verified by detailed circuit simulations.
文摘就目前的研究来说,隐藏吸引子是一个比较新颖的课题,而研究动力系统中隐藏吸引子的存在性问题是一项重要的研究课题。通过建立一个新颖的非线性Van Der Pol-Duffing振子模型,运用一项新的研究方法,即分析-数值方法,从而研究非线性动力系统中隐藏吸引子的存在性问题。基于经典的动力系统Hopf分支理论,根据Routh-Hurwitz判据讨论平衡点的稳定性,利用谐波线性化方法和分析-数值方法,分析并验证隐藏吸引子的存在性,最后通过数值模拟定位出隐藏吸引子。
