Applied Mechanics and Materials Vols. 260-261

Abstract: A modularized stand-alone hybrid generating system is designed and its composition and working principle is illustrated; working principle of components of wind driven generator, photovoltaic array, storage battery and controller etc. are expounded and corresponding mathematical model is established. In addition, tracking and control measures of the maximum power point based on maximum power given method and perturbation and observation method is proposed and design of software of the system is offered. Finally, simulation of the system is studied based on SIMULINK, resulting in that the system can realize tracing and control of the maximum power point.

Abstract: Wind power is the most large-scale development of technical and economic conditions of non-hydro renewable energy. The real time forecasting for wind power is difficult because of the wind power data has nonlinear interaction. A new real time forecasting model for wind power is established. In the model, state space reconstruction is used to transfer the original wind power time series to high dimension space. The input vector and anticipant output vector can be gained by the changed data in the high dimension space. Based on the theory of support vector machine, the real time forecasting model is established with the principle of structural risk minimization of support vector machine. The new model is used for the real time forecasting of wind power. The results prove the efficiency and validity of the new model.

Abstract: The smart grid is a developing network of transmission lines, equipment, controls and new technologies working together to respond immediately to 21st Century demand for electricity, but the smart grid may also create much new vulnerability if not deployed with the appropriate security controls. In this paper, to evaluate the secure GOOSE message performance, we implemented the IEC 62351-6 MAC mechanism, applied it on F-IED using the IEC 61850 GOOSE stack and the HSM, built the security test environment, and obtained test results.

Abstract: Wind energy is an increasingly important component of a utility’s service offerings. Due to the intermittent nature of wind energy, the accuracy of wind farm output forecasts is critical to ensuring optimal integration of wind energy with other sources on a grid. GDF SUEZ has developed an innovative approach to improving the accuracy of wind farm output forecasts which involves developing ensembles of neural networks, each of which is tuned to the characteristics of its target area. An overview of neural network technology and the neural network ensemble modeling process is provided, along with preliminary results based on actual operating data from GDF SUEZ in Lyon France.

Abstract: Worldwide, governments are introducing several rules and standards in the aim of limiting the quantity of primary energy for air conditioning of buildings and supporting the use of renewable source of energy for generating thermal and electric energy to be utilized in buildings such as the European Directive on the Energy Performance of Buildings [1]. Along with these interventions, another important action takes currently place in the building sector, that is the introduction of passive structural components of the envelope, able to reduce the requirements of energy for air conditioning purposes. Among these building components, the so-called green roofs are becoming more and more interesting for designer and buildings owners. This simple technical solution, in fact, apart its effectiveness in lowering particularly the summer cooling loads, could make more attractive the shape of each single building and, when adopted on a large extension, of an entire city district, reducing the risks for urban heat island phenomena that represent a severe problem in urban contexts. In this work, a short review of the literature models for computing the energy balance of roof coverings will be proposed, with particular reference in modelling the heat exchange of a canopy.

Abstract: In allusion to the problems of convention current protection when it was used to collect circuit of wind farm, the relay protection should consider the short-circuit current of wind generators; The principle of adaptive current protection was described, the fault current and attenuation characteristic of asynchronous wind generator was studied, the scheme of adaptive current protection was proposed for wind farm operation. Taking PSCAD/EMTDC as the platform, simulation and record the voltage and current sample-data of different wind farm operation which can guarantee high sensitivity phase selection, the high accuracy wind generators impedance measure method based on FFT filter DC component is presented , and using MATLAB program achieved the scheme of adaptive current protection. Simulation results demonstrate that collect circuit adaptive current protection is adaptive wind farm operation model, and enhance the operation benefit of wind farm.

Abstract: This paper discusses how to ensure the security of Chinese petroleum industry, i.e. setting up supervision mechanism for the petroleum industry by rules and regulations; exploring and excavating domestic oil resources; saving oil resources; enlarging oil reserve and importing oil from other countries by diplomatic efforts.

Abstract: This paper uses a total-factor framework to investigate energy efficiency in 22 major energy consuming countries, which consuming more than100 million tons of oil equivalent in 2010, including 14 OECD countries and 8 non-OECD countries. Two DEA models, total-factor energy efficiency model and energy-saving energy efficiency model, are used in this article to analyze the China’s energy efficiency for impersonality and comprehensive, and to find the energy efficiency difference between china and other countries, especially BRICS and neighbor countries.

Abstract: The paper focuses on a semi-submersible floating offshore wind turbine (FOWT) and analyses its dynamic response in storm condition. The wind load is calculated based on wind block model; the hydrodynamic load is modeled using Potential Theory and Morison Equation. The time-domain dynamic response of the FOWT is simulated by SESAM software with duration of 3 hours. The performance of the FOWT is analyzed based on time history responses and response spectrums. The results show some unique characteristics that differ from offshore platforms and the analysis proofs that the performance is acceptable and the design is reliable.

Abstract: In order to explore the regularity of fire station construction in domestic chemical industry park, the study reviewed the typical safety incidents in decade. Under the summary of characteristics of fire disaster, explosion, and leakage incidents, this article puts forward the methods for the construction of fire station system in chemical parks, especially the fire station construction standards, equipment requirements and the enhanced fire station. Hopefully, the study will be beneficial for the future development of fire station construction in chemical industry parks.