Frequency stability in modern power network from complex network viewpoint

Abstract

Grid-connected operation of Renewable Energy and Storage (RES) nodes make the dynamics of modern power grid to be more complex. A model of power grid, considering RES nodes, is being proposed to address frequency synchronization and stability analysis. First, a unified dynamical model of four different types of nodes are established according to the swing equation, including the RES nodes with power-frequency droop inverter controllers. The storage nodes have charging and discharging states. We provide a sufficient condition for the existence and stability of frequency synchronized solution via the linear time-varying consensus protocol of multi-agent system. The results are validated by Western System Coordinating Council and the Shaanxi North Power Grid model.

Stability analysis of discretized structure systems based on the complex network with dynamics of time‐varying stiffness

“…Its theoretical analysis methods are widely used in various science and industry branches such as the stabilities and associative memory in biological and artificial neural networks, [1][2][3][4][5] the synchronization and consistency of network agents in aerospace engineering, [6][7][8][9][10][11][12] and the vulnerabilities and stabilities of large-scale electric networks. [13][14][15][16][17] The main purpose of using complex network methods for analyzing such systems is that the considered system consists structurally of many nodes with their link relations, and the dynamics of system can be transferred as the dynamics of nodes and their link relations, and thus, the solution for concerned problem may be obtained by analyzing the dynamic behaviors of nodes and their link relations.…”

A novel deep reinforcement learning enabled agent for pumped storage hydro‐wind‐solar systems voltage control

“…However, WP and solar power generation are affected by climate change, and the characteristics of uncertainty, randomness, and uncontrollability challenge the stability of the systems through aspects such as frequency stability [5], small signal stability [6], and voltage stability [7]. In particular, the voltage overrun problem is particularly serious.…”