Abstract
Power system transient stability is a challenge when integrating large-scale wind turbines into weak grids. This paper addresses the issue of transient stability in such situations by optimizing a wind turbine’s active current behavior. A wind turbine’s active current reference controller and its setting optimization method are proposed based on analyses of two associated problems: the mechanism for improving transient stability of a single (synchronous) machine infinite bus (SMIB) system, as well as the various physical factor dependencies dictating how active and reactive wind turbine currents affect the swing dynamics of synchronous machines. Analysis of the first problem guided the design of the controller’s main structure. Analysis of the second problem guided selection of the control object within a wind turbine’s active and reactive currents, as well as helped recognition of the influential physical factors that must be considered in the parameter setting process. The efficiency of the controller and the validity of the analyses were verified by case studies using Kundur’s two-area system.
Highlights
Wind turbines are being increasingly integrated into weak grids that possess limited synchronous generators or long transmission lines, a situation found in many areas in China [1]
This paper addressed the issue of transient stability of weak grids with large-scale wind turbine integration by optimizing the active current behavior of wind turbines based on analyses of two associated problems
An analysis of the mechanism underlying transient stability improvement within a single machine infinite busbus (SMIB) system concluded that the transient stability of a SMIB system—including the first and second swing stabilities and other aperiodic or oscillatory stabilities—can be uniformly improved by dramatically increasing the magnitude of rotor acceleration in stages 2 and 4 and by moderately decreasing the magnitude in stages 1 and 3
Summary
Wind turbines are being increasingly integrated into weak grids that possess limited synchronous generators (i.e., are inertia weak) or long transmission lines (i.e., are link weak), a situation found in many areas in China [1]. An analysis mechanism for dependent on various physical factors—such as the location of the wind turbines and the strength of simple SMIB systems can produce engineering insights that can be used to guide the design of the the grid—in terms of affecting the swing dynamics of synchronous machines. An analysis of the main structure of a controller for transient stability improvement in systems that are more complex Another problem is howsystems the capability of the active andinsights reactivethat currents of a wind turbine are of the control object within a wind turbine’s active current and reactive current, as well as help dependent on various physical factors—such as the location of the wind turbines and the strength recognition of the influential physical must beof considered in themachines.
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