Modeling and mechanism analysis of inertia and damping issues for wind turbines PMSG grid-connected system
- PDF / 1,142,907 Bytes
- 11 Pages / 595.276 x 790.866 pts Page_size
- 27 Downloads / 218 Views
(0123456789().,-volV)(0123456789(). ,- volV)
METHODOLOGIES AND APPLICATION
Modeling and mechanism analysis of inertia and damping issues for wind turbines PMSG grid-connected system Shengqing Li1 • Zhang Donghui1 • Zheng Lan1 • Wen Chen1
Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Aiming at the problem of global climate change and energy crisis, wind power has become the focus of energy sustainable development in all countries. The wind turbines (WTs) power system is connected to the grid via the power electronic converter, causing the system inertia level to drop. In this paper, the direct-drive WT system is considered as the research object, and the whole-system frequency response model is established. The inertia and damping characteristics of the WT converter systems with virtual inertia control are analyzed. With the support of fan rotor kinetic energy and the energy saved in a capacitor, the simple control can also make the system exhibit different degrees of inertia and damping features. The results show that the equivalent inertia and the WT inertia time constant, capacitance parameters and virtual control parameters kd are related; the equivalent damping parameter is related to the steady-state operating point parameters and the virtual control parameter kp; the equivalent synchronization parameter is related to the steady-state operating point parameters and the virtual inertia control parameter ki. Finally, the correctness of the inertial and damping characteristics of the WT grid-connected system is verified by simulation, which provides a theoretical reference for studying the inertial damping of power electronic dominant systems. Keywords High proportion of renewable energy Virtual inertia Direct-drive wind turbines generation system Inertia and damping characteristics Power electronics-dominated power systems
1 Introduction Nowadays, wind turbines (WTs) generator technology is developing rapidly, and large-scale wind turbines have been connected to the power grid via power electronic converters, which have led to the development of power systems in the direction of power electronics (Blaabjerg et al. 2006; Zhao et al. 2018a). Traditionally, the inertia and damping levels of power systems, such as thermal power and hydropower, are gradually weakened, and the safe operation of power systems is threatened (Chang et al. 2017a). Different from conventional power generation system, WTs grid-connected generation systems of full-power converter control and frequency response of the grid are Communicated by V. Loia. & Zheng Lan [email protected] 1
nearly decoupled (Delille et al. 2012; Carrasco et al. 2006; Chang and Yang 2017). Permanent magnet synchronous generator (PMSG)-based WTs, which normally operate at maximum power point tracking (MPPT) control, are considered inertia-free in power systems. If this part of energy can be utilized, the inertia that the WTs can provide is also considerable for the wind farm. Based on maximum power control, in Conroy and Watso
Data Loading...
