ROA-van-der-pol

Region of attraction for van der pol system Reference: [1] Meng F , Wang D , Yang P , et al. Application of sum-of-squares method in estimation of region of attraction for nonlinear polynomial systems (August 2019)[J]. IEEE Access, 2020, PP(99):1-1. [2] Mazumder S K , Fuente E . Stability Analysis of Micropower Network[J]. IEEE Journal of Emerging & Selected Topics in Power Electronics, 2016, 4(4):1299-1309. Requirement: SOSTOOLS