Advanced Materials Research Vols. 1008-1009

Abstract: In-Situ combustion is an important transformation mode for heavy oil development, and the key to its success is ignition in the reservoir, On the basis of investigation and research into some related techniques both at home and abroad, this paper presents the development of mobile electric igniter, technical string, down-hole monitoring system, putting-in and putting-out device; the integral outside diameter of the igniter is φ25.4mm; this paper forms the technique of mobile electric ignition for fire flood in vertical hole and introduces the technical principle. The field test results show that the maximum outlet air temperature of the igniter is 527°C when the steam injection rate is 6500Nm³/d; And that realizes high temperature igniting of mobile electric igniter for the first time. This technique will effectively reduce the operation cost of fire flood, and provides technical reserve for separate zone ignition in thick mass oil pool of Liaohe Oilfield.

Abstract: MoO₃ was synthesized by thermal decomposition of ammonium molybdate. The structure and surface morphology of the as-prepared MoO₃ was characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The supercapacitive behaviour of MoO₃ in 1 mol L^-1 KCl electrolyte was studied by cyclic voltammetry (CV), galvanostatic charge-discharge cycling (CD). The affect of thermal decomposition temperature on the capacitive behaviour of MoO₃ was also discussed here. The results indicate that MoO₃ show good capacitive behaviour with a specific capacitance of 148.9 F g^-1 at 0.7 A g^-1. Thermal decomposition temperature has an important influence on the capacitive behaviour and crystallization of MoO₃.

Abstract: More and more attention is paid to the pollution and emission issues in aviation, renewable energy is applied on Unmanned Aerial Vehicles (UAVs). Solar and hydrogen energy were used in the hybrid power system to achieve the goals of zero-emission and long endurance. The power system was carefully designed to maximize its efficiency. The connection among solar cells, fuel cells and lithium batteries which were used in power system was discussed. The coupling relationship among propeller, motor and batteries (including solar cells, fuel cells and lithium batteries) was studied. The effects of power system configuration on system efficiency were analyzed. The results show that well-matched propeller, motor and batteries can effectively improve the power system efficiency.

Abstract: Electric Vehicles (EVs) are becoming increasingly popular in recent years. Battery Electric Vehicles (BEVs) are a type of EVs use stored energy more efficiently than typical internal combustion engine powered counterparts. A key challenge of BEV is the limited battery energy. In order to relieve electric vehicle range anxiety for BEV owners and achieve an optimal battery sizing for BEV, a travel distance power consumption model has been created to model the travel behavior of BEV in the fleet. The model provides an efficient way of estimating the power requirements of electric vehicles reach the destination.

Abstract: High penetration of electric vehicles has brought huge impact on the safe and stable operation of power grid. How to effectively improve the comprehensive utilization rate of electric vehicle charging and discharging has become the most important problem for the grid operation. In this paper, we establish the centralized station model which takes the minimal real power loss as its objective and bring variance optimization function. Using IEEE 30-bus system as simulation system, this paper uses genetic algorithm to find the best solution of the above model. The result shows that reasonable arrangement of charge and discharge plans not only smoothes the load curve, but reduces real power loss.

Abstract: Electric vehicle (EV) power supply infrastructure construction and the related technologies are the prerequisite and core of the EV industry development respectively. This paper introduces the technology research and application situation of charging, battery swapping and smart charging/battery swap service network operation management in China, and meanwhile introduces the EV energy supply infrastructure construction and some typical pilot projects in China. And the EV energy supply technologies development trend is discussed at last.

Abstract: Black start of power system is an issue of typical semi-structural optimization. Black-start scheme of power-grid recovery should have one or more alternative plans, when one project due to some special links cannot be successfully implemented, the other can quickly be implemented, so as to ensure the success rate of black-start crisis recovery. The preplan of crisis management requires the effective plan of crisis disposal, especially the preplan of black-start-path must be established, because effective recovery-path program can obtain an effective disposal of crisis to prevent the spread of the crisis. It is by the model of DEA that can evaluate the relative efficiency of the same type of black-start-path with multiple input, multiple output indexes, so as to identify gaps and improve the factors that affect the efficiency. So we chose the DEA model to evaluate the selection-path of black-start.

Abstract: A method based on modeling approach that from points to face and boundary conditioned parameter is put forward in this paper. Starting from the Point Model with statistical characteristics, the characteristic parameters which influence the configuration rate of reactive power compensation (RPC) are adopted as boundary conditions. Expanding from Point Model to Analysis Model, different features of actual 20kV cable distribution feeders can be covered. Then, with the optimization research on RPC of urban cable lines in 20 kV distribution networks, the recommended range of RPC rate in different transformers is worked out, which can be extended to the application of 20 kV urban distribution network. The simulation shows that the proposed method can optimize the reactive power configuration in 20 kV distribution networks without the complicated computation of optimal reactive power planning.

Abstract: In order to solve the islanding effect of single phase photovoltaic grid-connected system, by introducing some common passive and active detection, and generalizing the advantages and disadvantages of the two detections, we came up with and design an output energy changing method to achieve the detection and prevention of the islanding effect. Modeling and simulating this system under MATLAB , and the results show that the output energy changing method can detect the generation of islanding effect accurately, and achieve the anti-islanding effect effectively.

Abstract: Aiming at the two decomposition and coordination reactive power optimization algorithms both of which are based on proximal center algorithm, they are compared in detail in the calculation process, communication and coordination mode and the amount of required communication data in each iteration. Taking the IEEE 118-node system and the IEEE 300-node system as an example, the coefficient matrix, communication and coordination mode and the amount of required communication data in each iteration of the two algorithms are compared and analyzed. The convergence characteristics of the two algorithms are the same, and which algorithm is better depends on the communication and coordination mode is more convenient to apply and you want to select.