The integration of large scale wind farms bring serious influence to the stability of power system. In this paper, a simulation model of doubly-fed induction generator (DFIG) based wind turbine with capacity of 1.5 MW is constructed using the module of parameter identification in simulation software DIgSILENT. Then, to decrease the modeling error came from the difference between the wind energy utilization factor table in the DIgSILENT model and that of the actual wind generator, a new modified wind energy utilization factor table is developed. Finally, the DFIG-based wind turbine model, with corresponding identified parameters, is used to the practical wind generator by its actual operation data. The simulation result show that the active power output by the constructed simulation model has the similar tendency with the practical wind power data, i.e. the proposed method and the constructed model are effective.
Due to the serious air pollution problem since 2012 in the Beijing-Tianjin-Hebei (BTH) region, the Chinese government launched the national strategy of the BTH Coordinated Development (the BTHCD). Meanwhile, energy transition is also a national strategy in the region. What is the relationship between these two strategies, and in particular how can energy transition serve BTHCD strategy? Firstly, the paper identifies the three main areas of the BTHCD strategy, namely, transportation integration, industrial upgrading and transfer, and ecological and environmental protection, and finds that the ultimate goals of the strategy are to promote economic growth and environment protection in the region. Then, an empirical study is conducted by using the BVAR model, which further shows the that energy transition and BTHCD are closely related. Finally, policy recommendations are made for enabling an energy transition that supports the BTHCD.
As the proportion of new energy continues to increase, the safty and stability of the power system faces severe challenges. Many a flexible resource should be established to ensure that the regulating ability of the power system is enough, so as to cope with the load fluctuations caused by the gird-connected new energy. This article analyses the technical characteristics of various flexible resources, and which aspect that each flexible resource can contribute to the regulating ability of the power system. On this basis, this paper proposes a quantitative analysis method of the improvement of power system regulating ability based on the consumption model of new energy, using the addition of new energy grid-connected capacity as a quantitative indicator to evaluate the improvement of system regulating ability contributed by each type of flexible resource. Combined with calculation examples, a quantitative analysis of usual flexibility resources is carried out.
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