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  • Open Access

    ARTICLE

    Low Carbon Building Design Optimization Based on Intelligent Energy Management System

    Zhenyi Feng*, Nina Mo, Shujuan Dai, Yu Xiao, Xia Cheng
    Energy Engineering, DOI:10.32604/ee.2022.023471
    (This article belongs to this Special Issue: Smart Grid - Issues and Solutions for Energy-disadvantaged Communities)
    Abstract The construction of relevant standards for building carbon emission assessment in China has just started, and the quantitative analysis method and evaluation system are still imperfect, which hinders the development of lowcarbon building design. Therefore, the use of intelligent energy management system is very necessary. The purpose of this paper is to explore the design optimization of low-carbon buildings based on intelligent energy management systems. Based on the proposed quantitative method of building carbon emission, this paper establishes the quota theoretical system of building carbon emission analysis, and develops the quota based carbon emission calculation software. Smart energy management system… More >

  • Open Access

    ARTICLE

    Coordinated Rotor-Side Control Strategy for Doubly-Fed Wind Turbine under Symmetrical and Asymmetrical Grid Faults

    Quanchun Yan1,2,*, Chao Yuan1, Wen Gu1, Yanan Liu1, Yiming Tang1
    Energy Engineering, DOI:10.32604/ee.2022.018555
    (This article belongs to this Special Issue: Wind Energy Development and Utilization)
    Abstract In order to solve the problems of rotor overvoltage, overcurrent and DC side voltage rise caused by grid voltage drops, a coordinated control strategy based on symmetrical and asymmetrical low voltage ride through of rotor side converter of the doubly-fed generator is proposed. When the power grid voltage drops symmetrically, the generator approximate equation under steady-state conditions is no longer applicable. Considering the dynamic process of stator current excitation, according to the change of stator flux and the depth of voltage drop, the system can dynamically provide reactive power support for parallel nodes and suppress the rise of DC side… More >

  • Open Access

    ARTICLE

    Displacement Field Variable Modeling Method for Heterogeneous Materials in Wind Power Blade Core Plates

    Ying He, Yongshuang Wen*, Xuemei Huang, Leian Zhang, Rujun Song, Chang Li
    Energy Engineering, DOI:10.32604/ee.2022.022223
    Abstract In order to study the mechanical properties of the heterogeneous core plate of the wind turbine blade, a modeling method of the core plate based on displacement field variables is proposed. Firstly, the wind turbine blade core plate was modeled according to the theory of modeling heterogeneous material characteristics. Secondly, the three-point bending finite element model of the wind turbine blade core plate was solved by the display dynamic equation to obtain the deformation pattern and force-deformation relationship of the core plate. Finally, the three-point bending static test was conducted to compare with the finite element analysis. The test results… More >

  • Open Access

    ARTICLE

    Analysis of Multiple Annular Pressure in Gas Storage Well and High-Pressure Gas Well

    Lihu Cao1,2, Jinsheng Sun1,*, Bo Zhang3,*, Nu Lu4, Yuqiang Xu1
    Energy Engineering, DOI:10.32604/ee.2022.022867
    (This article belongs to this Special Issue: Simulation of Flow and Transport Problems in Petroleum Engineering)
    Abstract In gas storage or high-pressure gas wells, annular pressure is an unavoidable threat to safe, long-term resource production. The more complex situation, however, is multiple annular pressure, which means annular pressure happens in not only one annulus but two or more. Such a situation brings serious challenges to the identification of well integrity. However, few researches analyze the phenomenon of multiple annular pressure. Therefore, this paper studies the mechanism of multi-annular pressure to provide a foundation for its prevention and diagnosis. Firstly, the multi-annular pressure is classified according to the mechanism and field data. Then the failure mechanism and function… More >