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  • Open Access

    ARTICLE

    Improve Strategy for Transient Power Angle Stability Control of VSG Combining Frequency Difference Feedback and Virtual Impedance

    Dianlang Wang1, Qi Yin1, Haifeng Wang1, Jing Chen1, Hong Miao2, Yihan Chen2,*

    Energy Engineering, Vol.122, No.2, pp. 651-666, 2025, DOI:10.32604/ee.2025.057670 - 31 January 2025

    Abstract As the penetration rate of distributed energy increases, the transient power angle stability problem of the virtual synchronous generator (VSG) has gradually become prominent. In view of the situation that the grid impedance ratio (R/X) is high and affects the transient power angle stability of VSG, this paper proposes a VSG transient power angle stability control strategy based on the combination of frequency difference feedback and virtual impedance. To improve the transient power angle stability of the VSG, a virtual impedance is adopted in the voltage loop to adjust the impedance ratio R/X; and the… More >

  • Open Access

    ARTICLE

    Analysis of Renewable Energy Absorption and Economic Feasibility in Multi-Energy Complementary Systems under Spot Market Conditions

    Xiuyun Wang, Zipeng Zhang, Chuang Liu*, Guoliang Bian

    Energy Engineering, Vol.122, No.2, pp. 577-619, 2025, DOI:10.32604/ee.2024.056748 - 31 January 2025

    Abstract As the power system transitions to a new green and low-carbon paradigm, the penetration of renewable energy in China’s power system is gradually increasing. However, the variability and uncertainty of renewable energy output limit its profitability in the electricity market and hinder its market-based integration. This paper first constructs a wind-solar-thermal multi-energy complementary system, analyzes its external game relationships, and develops a bi-level market optimization model. Then, it considers the contribution levels of internal participants to establish a comprehensive internal distribution evaluation index system. Finally, simulation studies using the IEEE 30-bus system demonstrate that the More >

  • Open Access

    ARTICLE

    Value Assessment Method for the Grid-Alternative Energy Storage Based on Coordinated Planning Framework

    Bingqing Wu1, Yunli Yue1, Yi Zhou1, Hengyu Zhou2, Haowen Guan1, Zhenjiang Shi1, Zili Chen2,*, Zhaoyuan Wu2

    Energy Engineering, Vol.122, No.2, pp. 621-649, 2025, DOI:10.32604/ee.2025.056335 - 31 January 2025

    Abstract As the development of new power systems accelerates and the impacts of high renewable energy integration and extreme weather intensify, grid-alternative energy storage is garnering increasing attention for its grid-interaction benefits and clear business models. Consequently, assessing the value of grid-alternative energy storage in the system transition has become critically important. Considering the performance characteristics of storage, we propose a value assessment frame-work for grid-alternative energy storage, quantifying its non-wires-alternative effects from both cost and benefit perspectives. Building on this, we developed a collaborative planning model for energy storage and transmission grids, aimed at maximizing… More >

  • Open Access

    REVIEW

    The Electric Vehicle Surge: Effective Solutions for Charging Challenges with Advanced Converter Technologies

    Rajanand Patnaik Narasipuram1,*, Md M. Pasha2, Saleha Tabassum3, Amit Singh Tandon4

    Energy Engineering, Vol.122, No.2, pp. 431-469, 2025, DOI:10.32604/ee.2025.055134 - 31 January 2025

    Abstract The global adoption of Electric Vehicles (EVs) is on the rise due to their advanced features, with projections indicating they will soon dominate the private vehicle market. However, improper management of EV charging can lead to significant issues. This paper reviews the development of high-power, reliable charging solutions by examining the converter topologies used in rectifiers and converters that transfer electricity from the grid to EV batteries. It covers technical details, ongoing developments, and challenges related to these topologies and control strategies. The integration of rapid charging stations has introduced various Power Quality (PQ) issues,… More >

  • Open Access

    ARTICLE

    Changes in Depression, Anxiety, and Stress Levels during a Religious Period: A Prospective Cohort Study

    Ibrahim M. Gosadi*

    International Journal of Mental Health Promotion, Vol.27, No.1, pp. 41-49, 2025, DOI:10.32604/ijmhp.2024.059822 - 31 January 2025

    Abstract Objective: There is conflicting evidence suggesting an association between Ramadan and mental health. Aim: This study aims to assess changes in depression, anxiety, and stress levels during Ramadan among university students from Saudi Arabia and to measure the magnitude of change in these levels according to gender. Methods: This study is a prospective cohort study. Data was collected using a structured questionnaire that measured demographic data of the students, and levels of depression, anxiety, and stress utilizing the short form of the Depression Anxiety Stress Scales questionnaire (DASS 21). The assessments were performed starting from the… More >

  • Open Access

    ARTICLE

    Psychometric Properties of the Shortened Committed Action Questionnaire (CAQ-8): Evidence from Classical Test Theory and Network Analysis

    Haiyan Hu, Shuanghu Fang*, Qilin Zheng, Dongyan Ding

    International Journal of Mental Health Promotion, Vol.27, No.1, pp. 65-76, 2025, DOI:10.32604/ijmhp.2024.059324 - 31 January 2025

    Abstract Objectives: This study aimed to assess the reliability and validity of the abbreviated Committed Action Questionnaire (CAQ-8) in a cohort of 1635 Chinese university students. Methods: Participants completed the Chinese version of the CAQ-8 along with other standardized measures, including the Acceptance and Action Questionnaire-II (AAQ-II), the Valuing Questionnaire (VQ), the Satisfaction with Life Scale (SWLS), the Depression Anxiety Stress Scales (DASS-21), and the World Health Organization Five-item Well-Being Index (WHO-5). A retest was conducted one month later with 300 valid responses. Results: Exploratory factor analysis (n = 818) identified a 2-factor structure, confirmed through validated… More >

  • Open Access

    ARTICLE

    Associations between Rejective Parenting Style and Academic Anxiety among Chinese High School Students: The Chain Mediation Effect of Self-Concept and Positive Coping Style

    Dexian Li1, Wencan Li2, Xin Lin3,*, Xingchen Zhu4,*

    International Journal of Mental Health Promotion, Vol.27, No.1, pp. 1-17, 2025, DOI:10.32604/ijmhp.2024.058744 - 31 January 2025

    Abstract Background: The phenomenon of academic anxiety has been demonstrated to exert a considerable influence on students’ academic engagement, leading to the emergence of a phenomenon known as “learned helplessness” and undermining the self-confidence and motivation of high school students. Using acceptance-rejection theory, this study elucidated how a rejective parenting style affects Chinese high school students’ academic anxiety and explored the urban-rural heterogeneity of this relationship. Methods: Data were analyzed using a stratified whole-cluster random sampling method. There are a total of 30,000 high school students in the three regions of northern and central China (from… More >

  • Open Access

    ARTICLE

    The Association between Problematic Internet Use, Resilience, and Fatigue in First-Year Medical College Students in China: A Moderated Mediation Model

    Xiumei Chen1,2, Xiaobing Lu3,*, Yufu Ning1, Lifeng Wang1, Jeffrey H. Gamble4, Xianhe Chen5, Xingyong Jiang6, I-Hua Chen7,*, Peijin Lin8

    International Journal of Mental Health Promotion, Vol.27, No.1, pp. 51-63, 2025, DOI:10.32604/ijmhp.2024.057750 - 31 January 2025

    Abstract Background: Resilience is crucial for medical college students to thrive in the highly stressful environment of medical education. However, the prevalence of problematic internet use (PIU) in this population may negatively impact their resilience. This study investigated the influence of problematic online gaming (PG) and problematic social media use (PSMU) on the resilience of medical college students in China. Methods: A sample of 5075 first-year medical college students from four Chinese universities was studied. PG served as the independent variable, resilience as the dependent variable, fatigue as the mediator, and PSMU as the moderator. Structural… More >

  • Open Access

    ARTICLE

    The Relationship between Parent-Child Conflict and Non-Suicidal Self-Injury: A Moderated Mediating Model

    Min Li*

    International Journal of Mental Health Promotion, Vol.27, No.1, pp. 89-95, 2025, DOI:10.32604/ijmhp.2024.057223 - 31 January 2025

    Abstract Objectives: To explore the approaches for reducing non-suicidal self-injury (NSSI) behaviors in Chinese adolescents, the present study investigated the association between parent-child conflict and NSSI in adolescents, while also examining the mediating role of depression and the moderating role of rumination thinking. Methods: A cluster sampling method was employed to select 1227 Chinese adolescents aged 12 to 18 as participants, who completed measures including the Parent-Child conflict, Depression, Rumination Thinking, and Non-Suicidal Self-Injury questionnaires. The present study used SPSS 26.0 to conduct the Descriptive statistics, correlation analysis, and reliability tests, and PROCESS 3.3 to test… More >

  • Open Access

    ARTICLE

    Execution of Bioconvective Radiative Dissipative Non-Newtonian Magnetohydrodynamic Flow Comprising Stratification with BVP4C Approach Configured with Vertical Plane

    Gurram Dharmaiah1, Jupudi Lakshmi Rama Prasad2, Chegu Ramprasad3, Samad Noeiaghdam4,*, Unai Fernandez-Gamiz5, Saeed Dinarvand6

    CMES-Computer Modeling in Engineering & Sciences, Vol.142, No.2, pp. 2019-2044, 2025, DOI:10.32604/cmes.2025.061190 - 27 January 2025

    Abstract The mathematical model for non-Newtonian magnetohydrodynamics flows across a vertically stretched surface with non-linear thermal radiation, mass and heat transfer rates, thermophoretic and Brownian movements, bio-convection, and motile microbes considered in the present work. It is possible to regulate the nanomaterial suspension in the nanofluid using the growth of microbes. With the use of boundary layer approximation, highly nonlinear partial differential equations were derived for the present flow model. The nonlinear partial differential equations are converted into ordinary differential equations by utilizing similarity transmutations, which simplify them. Numerical elixirs for ordinary differential equations are found More >

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