Damping optimization control for small-signal stability of power system with VSGs under multiple operating conditions

Virtual synchronous generator (VSG) can improve the inertia and damping of power electronics dominated power system. In this article, an additional wide area stabilizer is added to VSG to enhance the small-signal stability of power system with VSGs. Furthermore, a damping optimization control strategy is proposed to realize the coordinated parameter tuning of additional wide area stabilizers and power system stabilizers. Firstly, a comprehensive evaluation index is established to select the installation generator and input signal of wide area stabilizer. The stabilizer designed according to the comprehensive evaluation index can damp the target mode without affecting the non-target modes, and the eigenvalue drift problem is avoided. Secondly, based on the Jensen-Shannon divergence, a global stability evaluation index is proposed to improve the global eigenvalue damping allocation under multiple operating conditions. Finally, the parameters of wide area stabilizers are optimized by particle swarm optimization algorithm. The effectiveness of the proposed damping optimization control strategy is verified by simulations.