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SUMMARY In this paper, the principles of the three‐phase saturated transformer coupling new‐type solid state fault current limiter (SSFCL) are studied using the equivalent circuit method; in addition, considering the nonlinearity of the iron core material in the saturated transformer, the circuit field‐coupled 3‐D finite‐element analysis is employed to investigate the transient performance of the proposed SSFCL. The analysis and simulation results show that the novel SSFCL has negligible impact on the power system during the normal operating stage, automatic response to the short‐circuit fault, and especially low secondary voltage level during the current‐limiting stage, which are of great significance to the reduction of the thyristor voltage level, the DC reactance, as well as the volume and cost of the whole SSFCL. The current‐limiting effect is also tested in the simulation of a multi‐machine power system with the protection of SSFCL. Last, the comparison of the simulation and experimental results proves the feasibility of the proposed SSFCL. Copyright © 2012 John Wiley & Sons, Ltd.

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Energy storage charging pile participating in the joint operation of power grid can not only reduce the cost of power grid expansion, but also obtain the benefit of participating in the auxiliary management service of power grid demand side response, so as to reduce operation cost. In this paper, energy storage charging pile is used to participate in the joint operation optimization of grid demand side response, and a model of optimal allocation of container energy storage in distribution network is proposed. Based on operation strategy of Optical storage charging station vehicle, the model aims to maximize investor's income in investment cycle, considering the income of participating in the voltage regulation, the subsidy income of delaying upgrading of distribution network, its investment and operation cost, and considering the constraints of voltage regulation of distribution network, the conversion of access nodes, energy conservation, etc., so as to optimize the number and rated capacity of Optical storage charging station vehicle. Finally, the case study of ieee33 node system is carried out. The results show that optimal configuration model can make investors of optical storage charging station gain profits and improve the economy of optical storage charging station.

In order to reduce the low effective utilization of the combined thermal power supply system caused by the abnormal energy distribution, the design of the electric conversion and energy storage integration of SOFC combined power supply system based on feature fusion is proposed. The design of internal combustion engine, heat storage device and battery is carried out. Based on the system temperature, SOFC heat exchanger model is established. The energy state in the heat exchanger model is analyzed and judged by feature fusion. According to the results, the energy is converted, stored and released. The experimental results show that the energy utilization efficiency of the system can reach 81.57%, which is 36.9% higher than the source system, which has good application value.