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Inverse system method for nonlinear control is introduced to the excitation control for a synchronous generator in this paper. The nonlinear model of the single machine-infinite bus system was transformed to the corresponding pseudo-linear system, and a variable structure controller was designed to the pseudo-linear system. A saturation function was used to eliminate the chatter of variable structure...
Static voltage stability assessment (VSA) of power system based on load margin computation has been a basic module in modern EMS. However, the static load voltage characteristics, automatic adjustment of ULTC and switchable shunt are not considered in most VSA tools. Furthermore, the thermal limit induced branch outage is not considered. Therefore, the maximal power limits obtained in VSA are not...
It is imperative to accurately consider the effect of external network on internal system's voltage stability for Online voltage stability assessment of a subsystem within a large interconnected power grid. Since the heaviest load condition of a system and a set of credible severe contingencies have to be considered in VSA, traditional network equivalent with respect to a snapshot case cannot meet...
The interaction and nonlinear relationship between different parameters or groups of parameters always are interested by the operators in control center of power grid. A practical tracing method of two parameter stability boundary for voltage stability assessment is proposed. In the traditional tracing method of two parameter bifurcation boundary a second order Hessian matrix of power flow equations...
Because of the certain stochastic nature of renewable generation, large-scale distributed generation systems can impose unpredictable impact on the stability of their integrated transmission systems. This paper demonstrates that power system oscillations can be caused by unpredictable changes of operating conditions of integrated distributed generation systems and hence presents a novel method of...
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