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This paper proposes using phasor measurement unit (PMU) data to trigger one-shot control in response to loss of synchronism detection. Decision trees (DTs) are trained to associate voltage magnitude and angle measurements with loss of synchronism. Different approaches to the DT construction process are illustrated in an early section of the paper by restricting the input vector to only two elements...
In this paper, enhancement of transient stability of Single Machine Infinite Bus (SMIB) system with a double circuit transmission line using a Non-superconducting Fault Current Limiter (NSFCL) is proposed. Stability analysis for such system is discussed in detail. It is shown that, the stability depends on the resistance of NSFCL in fault condition. To effective improvement of stability, the optimum...
Based on the dynamic security region, an optimal searching algorithm for emergency control measures was proposed. This algorithm changed the optimal point for generator tripping according to the transformation of unstable modes during the search process, which avoided the influence of negative effect problems caused by generator tripping in the transient stability control. A system with 8 generators...
Taking single generator infinite-bus system as example, equivalent reactance between generator and infinite bus is calculated and analytic expression of electromagnetic power is derived during the whole process during the whole process from single-phase fault occurred to fault-phase breaker tripped, single-phase re-closing to permanent fault and till three phase breakers tripped. Then single-phase...
In power systems, superconducting fault current limiters (SFCL) emerge as an alternative to limit the prospective short circuit currents to lower levels. The purpose of this paper is to study the influence of using superconducting devices on the transient stability of the synchronic operation and power quality. Different SFCL design and local of installation are also analyzed. Simulation studies are...
During recent years, the size of individual wind turbines has grown closer to 10 MW, and the size of wind power plants has increased significantly to 300 MW or more. This growing size of wind power generation requires that careful evaluation of transient stability of the overall grid should be undertaken. This paper attempts to investigate the impact of wind power plant penetration on the transient...
Based on the transient energy function (TEF) theory with classical models considered, the optimal re-closing time (ORT) can be calculated accurately. This paper mainly focuses attention on the validity and practicability analyzing of ORT obtained from this method. Firstly, the characteristics and influencing factors of the ORT are put forward and analyzed, and also the setting strategy of re-closing...
This paper mainly deals with the transient stability analysis of a 3Phi double circuit line in comparison with that of equivalent 6Phi transmission line. The method of conversion of 3Phi double circuit line into 6Phi line using 3Phi/6Phi transformers and the method of obtaining corresponding equivalent p.u. reactance values are explained. A computer program in MATLAB is developed using Gauss-seidelpsilas...
This paper describes the effect of wind turbine mechanical characteristic of construction and grid parameters on the transient voltage stability of a fixed speed wind turbine (FSWT) connected to a simple grid. The model of FSWT has been developed in Matlab/Simulink. Using this model, a three-phase fault is applied close to the wind turbine (WT) and cleared by disconnecting the faulted line. The effects...
This paper describes the transient stability analysis of a 10 kV distribution network with wind generators, microturbines and CHP plants. The network being modeled in Matlab/Simulink takes into account detailed dynamic models of the generators. Fault simulations at various locations are investigated. For the studied cases, the critical clearing times are calculated. Some network parameters which influence...
Large number of 400 V distributed generators (DGs) connected to existing electric systems may have a great impact on their dynamic behaviour when external disturbances occur, such as a three-phase short circuit fault. This paper presents an investigation about the transient stability and the capacity of DG to withstand disturbances in the distribution network. Three proposed solutions to avoid the...
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