二阶选择谐波重复控制(second order selective harmonic repetitive control, SOSHRC)策略因其良好的频率适应性和动态性能被广泛应用于并网逆变器控制中。针对传统SOSHRC策略的稳定性分析方法复杂、稳定性标准较为保守等问题,提出一...二阶选择谐波重复控制(second order selective harmonic repetitive control, SOSHRC)策略因其良好的频率适应性和动态性能被广泛应用于并网逆变器控制中。针对传统SOSHRC策略的稳定性分析方法复杂、稳定性标准较为保守等问题,提出一种新型二阶选择谐波重复-比例控制(second order selective harmonic repetitive control and proportional control, SOSHRC-PC)。首先,设计新型SOSHRC的结构和原理,并介绍新型SOSHRC-PC控制策略。然后,分析新型SOSHRC-PC控制器的稳定性和参数设计方法。最后,搭建基于新型二阶(6k±1)次谐波重复-比例控制的三相并网逆变器模型,仿真结果表明所提的控制策略具有良好的稳态和动态性能。展开更多
The Wilson coefficients of the standard model effective field theory are subject to a series of positivity bounds.It has been shown that while the positivity part of the ultraviolet(UV)partial wave unitarity leads to ...The Wilson coefficients of the standard model effective field theory are subject to a series of positivity bounds.It has been shown that while the positivity part of the ultraviolet(UV)partial wave unitarity leads to the Wilson coefficients living in a convex cone,further including the nonpositivity part caps the cone from above.For Higgs scattering,a capped positivity cone was obtained using a simplified,linear unitarity condition without utilizing the full internal symmetries of Higgs scattering.Here,we further implement stronger nonlinear unitarity conditions from the UV,which generically gives rise to better bounds.We show that,for the Higgs case in particular,while the nonlinear unitarity conditions per se do not enhance the bounds,the fuller use of the internal symmetries do shrink the capped positivity cone significantly.展开更多
文摘二阶选择谐波重复控制(second order selective harmonic repetitive control, SOSHRC)策略因其良好的频率适应性和动态性能被广泛应用于并网逆变器控制中。针对传统SOSHRC策略的稳定性分析方法复杂、稳定性标准较为保守等问题,提出一种新型二阶选择谐波重复-比例控制(second order selective harmonic repetitive control and proportional control, SOSHRC-PC)。首先,设计新型SOSHRC的结构和原理,并介绍新型SOSHRC-PC控制策略。然后,分析新型SOSHRC-PC控制器的稳定性和参数设计方法。最后,搭建基于新型二阶(6k±1)次谐波重复-比例控制的三相并网逆变器模型,仿真结果表明所提的控制策略具有良好的稳态和动态性能。
基金supported by the Fundamental Research Funds for the Central Universities(WK2030000036)the National Natural Science Foundation of China(12075233).
文摘The Wilson coefficients of the standard model effective field theory are subject to a series of positivity bounds.It has been shown that while the positivity part of the ultraviolet(UV)partial wave unitarity leads to the Wilson coefficients living in a convex cone,further including the nonpositivity part caps the cone from above.For Higgs scattering,a capped positivity cone was obtained using a simplified,linear unitarity condition without utilizing the full internal symmetries of Higgs scattering.Here,we further implement stronger nonlinear unitarity conditions from the UV,which generically gives rise to better bounds.We show that,for the Higgs case in particular,while the nonlinear unitarity conditions per se do not enhance the bounds,the fuller use of the internal symmetries do shrink the capped positivity cone significantly.