The transmission line parameters may not remain constant all the time, they may vary with different environment conditions, and the variation has much influence on the accuracy of fault location. In this paper, the effect of parameter variation on fault location was first studied using simulated transient data generated using EMTP, then an algorithm combined with parameter estimation was presented, and finally the presented algorithm was tested by simulated transient data generated using EMTP and actual recorded data. Test results show that the proposed algorithm can improve the accuracy of fault location, especially when the line parameters provided are not accurate.
Abstract.The distributed generation which is integrated in the active distribution network changes power flow, bringing new challenges to the voltage control. When voltage limit violation happens, in order to make the voltage return to normal range and improve the voltage quality, a novel voltage control strategy is proposed. Considering the voltage quality and node importance, the electrical closeness centrality and key node contribution degree are defined, and the key nodes are determined by the orders of the key node contribution degree. This paper uses the reactive power compensation devices which are installed at the key nodes coordinated with the reactive power output of the distributed generation to realize the voltage optimization control. The voltage optimization control model is established by taking the minimum power loss as an objective function. Using the particle swarm optimization algorithm solves the model. The simulation results of the improved IEEE-33 bus system verify the effectiveness of the proposed method.
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