A novel efficient AgI‐Bi2MoO6/vermiculite adsorption‐photocatalyst is successfully synthesized by sol‐gel method and precipitation method. The structure and properties of AgI‐Bi2MoO6/vermiculite were analyzed by XRD, FT‐IR, XPS, SEM, TEM, BET, and DRS. All the AgI‐Bi2MoO6/vermiculite composites with different AgI content show enhanced photocatalytic performance for malachite green (MG) dye degradation compared to pure Bi2MoO6 and Bi2MoO6/vermiculite composites. The highest degradation efficiency for MG (30 mg/L) via 5 wt%‐AgI‐Bi2MoO6/vermiculite composite (AgI content 5 wt%) photocatalyst (1 g/L) reaches 98.89% in 60 min at pH 9 without salt. The enhanced performance can be attributed to the uniform dispersion of Bi2MoO6 and AgI on the surface of vermiculite, the stable structure, the enhanced adsorption and the widened visible‐light absorption range as well as the faster separation of electron‐hole pairs. Besides, the photocatalyst still shows relatively high adsorption and photocatalytic performance after three times recycling. In addition, the possible photocatalytic mechanism is proposed at the end.
According to the demand of wind farm power fluctuations stabilize and the characteristics of hybrid energy storage system. Taking vanadium redox flow battery (VRB) and supercapacitor (SC) as research object, a hybrid energy storage system optimal configuration model is builted. Combined with expert systems and improved genetic algorithm proposed a hybrid energy storage system to optimize the allocation method. The method first established desire output curve of the wind farm based on grid energy saving efficiency and static voltage stability indicators, then introduce coordinate control strategy based on expert system to improved genetic algorithm to get the result of optimal configuration and verify the correctness of this model and method. Finally, analysis the performance of VRB and SC in a typical days wind farm output situation, verify the conclusions of experts coordinated control strategy can extend the vanadium battery life.
This paper is divided into two cases to study the communication transmission equipment reliability in the state of the ice storm, according to the huge losses of power system communication caused by the ice storm. For the nodes or links which are not affected by the ice storm, we use the calculation with "the mean time between failures (MTBF)" and "the mean time to repair" (MTTR) to put forward the calculation methods; for the OPGW cable which influenced greater in ice storm, we use the fiber excess length and the elongation of fiber optic cable. It obtains all the paths of the network through improved adjacency matrix method, and then it uses binary decision diagram to obtain the overall reliability of the network. By testing the network nodes and links using "N-1" inspection, the key nodes and key links can be obtained. Finally, considering the importance degree of network transmission business, the reliability evaluation method of power system communication network based on the risk theory in the case of the ice storm has been put forward, and the example to verify that the method can provide the basis for the reliability assessment of the power system communication in the case of the ice storm has been given.
To accelerate feeder automation detection and fault solution, this paper applied the communication protocol and related technologies of IEC61850, proposed the information exchange among the feeder terminals, and improved GSE model which provided a function of fast and reliable input/output value in the whole system. Adopting the layered IP network communication theory, it divided the entire network into the backbone network and the branch network, and constructed a three-layer FA architecture. The three layers respectively were master station layer, slave station layer and terminal layer. Logic nodes supplied by IEC61850 were used to accomplish the modeling of TTU information in the paper. And then, it discussed the realization of terminal self-describing. Finally, this method was applied in the DAS, and it achieved the purpose of accelerating the detection and fault solution and improving the power distribution reliability. I. I NTRODUCTION With the development of society, economy and the technological progress, human put forward higher request to power grid security and power quality, the birth of smart grids solves these problems. The smart grids include smart transmission grids and smart distribution grids (SOG). SOG is the future vision of the distribution network[l], it with distribution senior automation technology as the foundation, through all sorts of advanced technologies, uses intelligent equipments to realize monitoring, optimization in the normal state of the power grid, and self-healing control under the abnormal operating condition[2]. Feeder automation (FA) is the most fundamental and important part of distribution network, being one of the key technologies to improve the reliability of the distribution network [1-3]. The key to realize intelligent in FA is the ability of making the intelligent electronic devices (lED) between the same or different manufactures exchange information and correctly using the interoperability of information, to avoid the phenomenon of 'automation island'. IEC61850 is a complete communication standard system on the substation automation system, using the top-down to hierarchical the system and define functions, and object models, thus completely gains the self-describing of object-oriented and application-oriented. Abstract model is adopted between devices to quickly input and output data values in system-wide, achieving the requirement of interoperabi lity[2-4]. The FA model based on the IEC61850 is an optimal control model. This paper studied the communication TENGHUAN Sichuan University -China 434988455@qq.com protocol and related technologies of IEC61850, proposed the information exchange among the feeder terminals, trying to realize feeder protection function on distribution FTU/TTUIDTU. This method was applied in the DAS, and it achieved the purpose of accelerating the communication and improving the reliability of power distribution. II. GOOSE MODEL Generic Substation Event (GES) model includes GOOSE model and GSSE model, the former supports public data exchang...
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