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In this study, the authors propose a new mathematical model that allows the accurate computation of currents flowing through a substation's grounding grid buried in horizontal multilayered earth, which is a hybrid of Galerkin's method of moment and the conventional nodal analysis method based on ‘T’ typical basic elements. The dynamic state complex image method and the closed form of Green's function...
This paper analyses the main reasons of yield risks, combined with the tariff recovery problems and the particularity of electricity market in power enterprises. Relative measures and methods are proposed to lower yield risks according to the analysis results. Besides, a yield risk management control evaluation system is established combined with Risk Control Theory. The management control measures...
With the rapid development of large-scale interconnected power systems, inter-area low frequency oscillation phenomena occasionally occur; thus, the small signal stability problem has become a serious issue affecting power system stability. When analyzing the small signal stability of a large-scale power grid (in particular, on-line dynamic security early warning systems), given the high rank of the...
In this paper, a new sparse approximation technique is proposed for incremental power grid analysis. Our proposed method is motivated by the observation that when a power grid network is locally updated during circuit design, its response changes locally and, hence, the incremental “change” of the power grid voltage is almost zero at many internal nodes, resulting in a unique sparse pattern. An efficient...
The The development of society and economic increases the demand of electric power with more stability in power system. Therefore, research on emergency management for power system is of great theoretical and practical significance to reduce their occurrence and the losses they bring. Based on the general theory of emergency management and combined with the characteristics of grid emergencies, the...
Plug-in hybrid electric vehicles (PHEVs) are recently being widely touted as a viable alternative to conventional vehicles due to their environment friendly and energy-wise features. Assuming that moving into the future, a large number of PHEV users will exist, the overall influence of charging the on-board ESS is non-negligible. Instead of charging from grid, renewable energy, such as wind energy...
A DC microgrid is a hybrid renewable system that renewable sources supply the average load demand, while storage and nonrenewable generation maintain the power balance in the presence of the stochastic renewable sources. The control strategy can realize the optimal allocation of power by using DC bus signal and the bus voltage is controlled by PV converter, battery converter and fuel cell converter...
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