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The following topics are dealt with: Power system monitoring and optimization; power system management and power transmission; power generation and power system planning; power generation-thermal power, wind power and solar power; environment protection; power transmission and electromagnetic analysis; power system security and monitoring; energy efficiency and environment-friendly technologies.
Mobile bridges are primarily to make span-crossing and form traffic path flexibly and rapidly. FRP (Fiber-reinforced polymer composite) is suitable for the construction of mobile bridge as its advantages of light-weight and high-strength. In this paper, the ANSYS optimization module is used to optimize the linear of the FRP bridge, in order to lose the weight of the bridge.
Though the combination energy-saving measure for mechanical oil production well plays a very important role in improving the whole economic efficiency of the oil field, it does not reach to the optimal saving status. Except for the increasing inputs of saving measure, optimizing of the combination of kinds of saving equipment and technology is needed for enhancing the economic efficiency of the combination...
Steam pipelines play an important role in industrial enterprises. They joint the heat producer and users, and constitute the energy transmission networks. The total cost on steam pipelines include the expense of steel and heat insulator, converted expense of heat loss, and construction cost. This study develops a mathematical model of total cost on steam pipelines with golden section algorithm. The...
Optimization of the combination of power generation units is a very important problem as to improve the economic efficiency of power plant. Mind Evolutionary Computation (MEC) simulates the evolutionary process of human's mind. With convergence and variation process, MEC can get the optimum solution Compared with other optimizing method such as dynamic planning method, its arithmetic is simple- and...
An orthogonal experimental scheme is designed for analyzing the powertrain system based on GT-drive. What extent of engine, gear-box and final drive influence on dynamic and economic performance of vehicle is presented respectively; hence, we can get An optimal matching option is get by comparing the results under different schemes. The effectiveness of this method is proven by real experiment.
This paper addresses the problem of identifying the optimal location for power quality monitors.The proposed approach is based on using the integer programming-based model and PSO to solve the optimization problem. Establish a 0-1 sensitivity equation to form the constrains of integer programming by PSCAD/EMTDC.The proposed approach gives the minimum number of power quality monitors and their locations...
Motivated by the topics of active portfolio management payed close attention by many researchers and the fact that there exists rarely explicit solution approach in robust portfolio literature. We propose an active portfolio model in which we minimize the worst-case probability loss of portfolio subject to multiple weights constraints. We explore the explicit solution of the proposed model. And we...
Aiming at regional power grid whose power supply is a substation that connects the upper and lower grid, REI (Radial Equivalent Independent) equivalent is applied to voltage and reactive power optimization control, and varying-intercept linear regression method is proposed to obtain equivalent parameters according to local data taking into account the difficulty of getting the upper grid operating...
Energy density and power density are two of the most significant specifications for a fuel cell system. Generally speaking, energy density should be derived from the fuel cell efficiency. All these performance indices are closely correlated with the control variables of the balance of plant (BOP). The present paper proposes an optimization algorithm that maximizes the fuel cell efficiency. The strategy...
A comprehensive optimal regulation model for distribution networks is presented, which utilizes the reactive power regulating means, sectionalizing and tie switchers to reduce active power losses. A loop-based coding scheme is proposed for reconfiguration description. The reactive tabu search algorithm is employed to get the optimal solution. The efficiency of the proposed method is identified by...
If a linear turbine cascade experimental apparatus uses only few cascade model, it has several advantages in experiment, such as increasing the accuracy of experimental result by applying bigger turbine cascade model on the same apparatus without increasing compressor power, and easy access of optical devices within the cascade passage. However, it is difficult to make the same periodic flow conditions...
The Combined cooling, heating and power (CCHP) system should be operated under the optimal scheme to meet the varying demand for cooling, heating and electricity and to reduce cost and save energy for buildings. Based on the analysis of the energy flow, a mixed integer linear program (MILP) optimal model has been developed. The objectives are to minimize the annual total cost, primary energy consumption...
The back-pressure of the direct air-cooled unit directly affects the system running economy. Based on the thermodynamic model of the air-cooled system, according to the basic method of seeking the optimal back-pressure in theory, this article has established the back-pressure optimization mathematical model of the air-cooled unit to obtain the optimal back-pressure under the actual operating conditions,...
A new heuristic optimization algorithm is proposed in the paper, that is an improved ant colony algorithm for solving continuous space optimization problems. It is used in dynamic parameter aggregation based on frequency domain aggregation. The result from aggregation of generator electromagnetic circuit and excitation system show that an improved ant colony algorithm in aggregation of generator dynamic...
In this paper the soft turn-on of NPT IGBT under Active Voltage Control (AVC) is presented. The AVC technique is able to control the IGBT switching trajectory according to a pre-defined reference signal generated by a FPGA chip. By applying a special designed reference signal at turn-on, the IGBT turn-on current overshoot and diode recovery can be optimized. Experiments of soft turn-on with different...
An operation mode called hybrid sliding pressure operation mode, which considered the valve point and operation load together, was proposed in this paper based on the analysis and study of a large number of unit operation optimization methods. In addition, according to the steam-excited vibration occurred during the optimization process when the nozzle governing steam turbine switch single valve to...
The transesterification reaction of beef tallow to biodiesel using Cs2O/γ-Al2O3 as a solid base catalyst was studied. Response surface methodology and central composite rotation design were employed to optimize the reaction conditions. The optimum conditions giving 95.5% biodiesel yield were: reaction time 120 min, temperature 66°C, catalyst amount 5.3% (based on the weight of oil), molar ratio of...
Reasonable black start schemes play a major role to the fast restoration of power system after black-out. Partitioning the whole system into several subsystems which are restored in parallel can speed up the restoration process. This paper proposes an optimization approach of network partitioning and the restoration sequence determination for black-start. The optimization target is to restore as many...
In literature, variable speed control of belt conveyors is recommended to save energy consumption. However, the current implementations mostly focus on lower level control loops without operational considerations at the system level. This paper intends to take a model based optimization approach to improve the operation efficiency of belt conveyors with consideration of various constraints. Specifically,...
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