Inertia Optimization Control and Transient Stability Analysis of Wind Power Grid-Connected System

Abstract

The virtual inertia control effectively makes up for the insufficient inertia caused by the high penetration wind power grid connection. However, it has an impact on the mechanical part of the wind turbine and greatly increases the difficulty of the dynamic stability analysis of the system, resulting in limited engineering practicability. Therefore, the state equation of the wind power grid-connected system is established in this paper, and the influence of virtual inertia control on wind turbine shafting oscillation is analyzed based on the small-signal theory. Secondly, the nonlinear extended disturbance observer is designed as the compensation signal of inertia control to improve its dynamic stability supportability. Based on the integral manifold method, the shafting model of the wind turbine is reduced, and the transient energy function of shafting is established, which provided the basis for the design of the shafting stability controller. Finally, a grid-connected wind power system with high permeability is installed, and the results demonstrate that under the proposed control strategy, the swing stability of power angle is significantly improved, and the wind turbine shafting oscillation is suppressed.

Frequency stability control method for multi-energy system considering storage characteristics and transmission inertia of hot and gas pipeline network

“…The above research mainly focuses on the control of the frequency regulation characteristics of the power subsystem after adding clean energy into the multi-energy microgrid, or the research on the coordinated and optimized scheduling control of the grid primary frequency regulation and multi-energy microgrid by adding energy storage devices. In order to meet the inertia demand of the multi-energy microgrid system and improve the frequency cooperative support capability of the system, it is necessary to analyze the influencing factors of the inertia demand of the multi-energy microgrid cluster, and to realize the inertia frequency stability of the system through the coordination of multi-energy [16][17][18][19].…”

Transient energy transfer control of frequency-coupled energy storage devices in low inertia prosumer energy systems

“…With the application of voltage source converters, the decoupled RPG has gained great potential in power regulation. The kinetic energy stored in a rotating rotor can be utilized to provide rapid frequency response by introducing the frequency control modules, such as df/dt (Xiong et al, 2021a;Song et al, 2022;You et al, 2022), P/f droop (Xiong et al, 2021b;Yang et al, 2023b) and PID (Wang et al, 2015;Zhu et al, 2018) into the maximum power point tracking (MPPT) control of variable speed wind turbines. However, unlike wind turbines, the PV arrays and energy storage devices have no rotational kinetic energy (Alipoor et al, 2013).…”