Future electricity demand will significantly increase, while flexibility in supply will decrease, due to an increase in the use of renewable energy sources. The most effective way to prepare distribution grids for thi...
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ISBN:
(纸本)9781467325950
Future electricity demand will significantly increase, while flexibility in supply will decrease, due to an increase in the use of renewable energy sources. The most effective way to prepare distribution grids for this increase in loading and decrease in supply-flexibility is to apply balancing, load-shifting, peak-shaving and other smart-grid related technologies. Without the implementation of smart grid technologies in distribution networks, it is almost impossible to keep the power supply at the current reliability and quality levels. An important factor in the success of smart grids, is the implementation of distribution automation systems (DAS). The ability to reconfigure networks, divert powerflows, isolate faults and prevent overloading of network components all contributes to the optimal operation of self-healing distribution grids, which is necessary for future electricity demands. In this paper, a literature research on the status of distribution automation research is presented and an outlook towards future roles of distribution automation systems is explored. Emphasis is put on the integration of different applications in order to be able to grasp the full potential of DAS. Furthermore an elaborate case study is presented, considering the effects of DAS integration into the live distribution grid.
A triple bi-directional DC/DC converter used for powerflow control of energy storage in wind power system is designed. Firstly, the paper analyzes energy flow characteristic of wind power system containing hybrid ene...
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A triple bi-directional DC/DC converter used for powerflow control of energy storage in wind power system is designed. Firstly, the paper analyzes energy flow characteristic of wind power system containing hybrid energy storage(the battery and the supercapacitor). Secondly, working principle of the triple bi-directional DC/DC converter is explained and mathematical model is constructed. Then, based on the model, control unit consisting of voltage outer loop and current inner loop is designed. To ensure the consistency of working state of batteries in parallel, a novel current-sharing strategy is proposed based on battery SOC(state of charge). To realize energy distribution between the battery and the supercapacitor, a one-order low pass filter is used to detach the low frequency component in feedback voltage. The simulation results show that the converter can effectively regulate the load voltage and reasonably distribute the power between both energy storage elements.
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