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ESG ratings and corporate success: analyzing the environmental governance impact on Chinese companies’ performance 环境、社会和治理评级与企业成功:分析环境治理对中国企业绩效的影响
IF 3.4 4区 工程技术 Q3 ENERGY & FUELS Pub Date : 2024-08-26 DOI: 10.3389/fenrg.2024.1371616
Sidi Chen, Min Fan
This study explores the impact of ESG ratings on corporate performance, focusing on achieving sustainable development and corporate sustainability through innovation within the context of high-quality global economic growth. In recent years, ESG ratings have garnered significant attention in the financial sector, influencing corporate strategy and performance management. While some argue that ESG activities might detract from profitability, others highlight that firms with strong ESG performance can access low-cost capital, thereby enhancing overall performance. Using a sample of China’s A-share listed companies from 2009 to 2021, this research examines the influence and mechanisms of ESG ratings on corporate performance. The findings indicate a significant positive relationship between ESG ratings and corporate performance, which remains robust after rigorous testing. Mediation analysis reveals that ESG ratings improve corporate performance by alleviating financing constraints and enhancing corporate reputation. Furthermore, the performance-enhancing effects of ESG ratings are more pronounced in firms with robust internal controls and private enterprises. This research provides empirical evidence to support stronger ESG investment and the refinement of the ESG rating system.
本研究探讨了环境、社会和公司治理评级对企业绩效的影响,重点是在全球经济高质量增长的背景下,通过创新实现可持续发展和企业可持续性。近年来,环境、社会和公司治理评级在金融领域备受关注,对企业战略和绩效管理产生了影响。有人认为,环境、社会和公司治理活动可能会削弱企业的盈利能力,但也有人强调,环境、社会和公司治理表现优异的企业可以获得低成本资本,从而提高整体业绩。本研究以 2009 年至 2021 年中国 A 股上市公司为样本,考察了环境、社会和公司治理评级对企业绩效的影响和机制。研究结果表明,环境、社会和公司治理评级与企业绩效之间存在明显的正相关关系,且经过严格检验后仍保持稳健。中介分析表明,ESG 评级通过缓解融资约束和提高企业声誉来提高企业绩效。此外,ESG 评级对内部控制健全的企业和私营企业的绩效提升作用更为明显。这项研究为支持加强 ESG 投资和完善 ESG 评级体系提供了经验证据。
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引用次数: 0
Research on line loss prediction of distribution network based on ensemble learning and feature selection 基于集合学习和特征选择的配电网线损预测研究
IF 3.4 4区 工程技术 Q3 ENERGY & FUELS Pub Date : 2024-08-23 DOI: 10.3389/fenrg.2024.1453039
Ke Zhang, Yongwang Zhang, Jian Li, Zetao Jiang, Yuxin Lu, Binghui Zhao
IntroductionAccurate prediction of line losses in distribution networks is crucial for optimizing power system planning and network restructuring, as these losses significantly impact grid operation quality. This paper proposes a novel approach that combines advanced feature selection techniques with Stacking ensemble learning to enhance the effectiveness of distribution network loss analysis and assessment.MethodsUtilizing data from 44 substations over an 18-month period, we integrated a Stacking ensemble learning model with multiple feature selection methods, including correlation coefficient, maximum information coefficient, and tree-based techniques. These methods were employed to identify the key predictors of power loss in the distribution network.ResultsThe proposed model achieved a Mean Absolute Percentage Error (MAPE) of 3.78% and a Root Mean Square Error (RMSE) of 1.53, demonstrating a substantial improvement over traditional linear regression-based prediction methods. The analysis revealed that historical line loss and line active power were the most influential predictive variables, while the inclusion of time-related features further refined the model's performance.DiscussionThis study highlights the efficacy of combining multiple feature selection methods with Stacking ensemble learning for predicting power loss in 10 kV distribution networks. The enhanced accuracy and reliability of the proposed model offer valuable insights for electrical engineering applications, potentially contributing to more efficient and sustainable energy distribution systems. Future research could explore the applicability of this approach to other distribution network voltage levels and investigate the incorporation of additional environmental and network-specific factors to further improve power loss prediction.
导言准确预测配电网络中的线损对于优化电力系统规划和网络重组至关重要,因为这些损耗会严重影响电网运行质量。本文提出了一种新方法,将先进的特征选择技术与堆叠集合学习相结合,以提高配电网损耗分析和评估的有效性。方法利用 44 个变电站 18 个月的数据,我们将堆叠集合学习模型与多种特征选择方法相结合,包括相关系数、最大信息系数和基于树的技术。结果该模型的平均绝对百分比误差 (MAPE) 为 3.78%,均方根误差 (RMSE) 为 1.53,与传统的基于线性回归的预测方法相比有了显著改善。分析表明,历史线损和线路有功功率是最有影响力的预测变量,而时间相关特征的加入则进一步完善了模型的性能。 讨论 本研究强调了将多种特征选择方法与堆叠集合学习相结合预测 10 千伏配电网电能损耗的功效。所提模型的准确性和可靠性得到了提高,为电气工程应用提供了宝贵的见解,可能有助于提高配电系统的效率和可持续性。未来的研究可以探索这种方法在其他配电网络电压等级中的适用性,并研究纳入其他环境和网络特定因素以进一步改进功率损耗预测。
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引用次数: 0
Progress in green hydrogen adoption in the African context 非洲在采用绿色氢能方面取得的进展
IF 3.4 4区 工程技术 Q3 ENERGY & FUELS Pub Date : 2024-08-23 DOI: 10.3389/fenrg.2024.1429118
Enoch I. Obanor, Joseph O. Dirisu, Oluwaseun O. Kilanko, Enesi Y. Salawu, Oluseyi O. Ajayi
Hydrogen is an abundant element and a flexible energy carrier, offering substantial potential as an environmentally friendly energy source to tackle global energy issues. When used as a fuel, hydrogen generates only water vapor upon combustion or in fuel cells, presenting a means to reduce carbon emissions in various sectors, including transportation, industry, and power generation. Nevertheless, conventional hydrogen production methods often depend on fossil fuels, leading to carbon emissions unless integrated with carbon capture and storage solutions. Conversely, green hydrogen is generated through electrolysis powered by renewable energy sources like solar and wind energy. This production method guarantees zero carbon emissions throughout the hydrogen’s lifecycle, positioning it as a critical component of global sustainable energy transitions. In Africa, where there are extensive renewable energy resources such as solar and wind power, green hydrogen is emerging as a viable solution to sustainably address the increasing energy demands. This research explores the influence of policy frameworks, technological innovations, and market forces in promoting green hydrogen adoption across Africa. Despite growing investments and favorable policies, challenges such as high production costs and inadequate infrastructure significantly hinder widespread adoption. To overcome these challenges and speed up the shift towards a sustainable hydrogen economy in Africa, strategic investments and collaborative efforts are essential. By harnessing its renewable energy potential and establishing strong policy frameworks, Africa can not only fulfill its energy requirements but also support global initiatives to mitigate climate change and achieve sustainable development objectives.
氢是一种丰富的元素,也是一种灵活的能源载体,作为一种环境友好型能源,为解决全球能源问题提供了巨大的潜力。当用作燃料时,氢在燃烧或在燃料电池中只产生水蒸气,这为包括交通、工业和发电在内的各个领域提供了减少碳排放的途径。然而,传统的氢气生产方法通常依赖化石燃料,除非与碳捕获和储存解决方案相结合,否则会导致碳排放。相反,绿色氢气是通过太阳能和风能等可再生能源的电解产生的。这种生产方式保证了氢气在整个生命周期内的零碳排放,使其成为全球可持续能源转型的重要组成部分。在太阳能和风能等可再生能源资源丰富的非洲,绿色氢气正成为可持续满足日益增长的能源需求的可行解决方案。本研究探讨了政策框架、技术创新和市场力量对促进非洲各地采用绿色氢能的影响。尽管投资和有利政策不断增加,但高生产成本和基础设施不足等挑战极大地阻碍了绿色氢能的广泛应用。要克服这些挑战,加快非洲向可持续氢经济的转变,战略投资和合作努力至关重要。通过利用其可再生能源潜力和建立强有力的政策框架,非洲不仅可以满足其能源需求,还可以支持减缓气候变化和实现可持续发展目标的全球倡议。
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引用次数: 0
Preparation and characterization of Al-12Si/ceramic composite phase change heat storage material 铝-12Si/陶瓷复合相变蓄热材料的制备与表征
IF 3.4 4区 工程技术 Q3 ENERGY & FUELS Pub Date : 2024-08-23 DOI: 10.3389/fenrg.2024.1455576
Gaoqun Zhang, Dabo Duan, Jingcen Zhang, Junjie Hao, Zhanfeng Deng
Thermal storage ceramics using metals as phase change materials (PCMs) have both high thermal conductivity and high heat storage density. However, in the process of use is very easy to occur in the metal phase change material leakage, will seriously affect the service life of the thermal storage ceramics. In this study, ceramic composite phase change heat storage materials with Al-12Si alloy as phase change material were prepared. Firstly, Al-12Si was pretreated by sol-gel method and high temperature heat treatment to obtain the pretreated Al-12Si alloy powder with dense alumina shell layer. After that, the pretreated Al-12Si alloy powder was mixed and pressed with alumina, silicon dioxide, magnesium oxide, and mullite respectively, and sintered at 1,100°C, 1,200°C, or 1,300°C. The experimental results show that the metal phase change materials and the four ceramic materials show good chemical compatibility, and pretreated Al-12Si essentially retains its initial shape and is uniformly dispersed in the heat storage material. Among all the samples, the pre-treated Al-12Si/mullite ceramic thermal storage materials with a sintering temperature of 1,200°C showed the best thermal storage performance. The thermal conductivity of the samples was up to 17.94 W/(m·K). The latent heat storage value was 139.51 J/g before thermal cycling, 138.27 J/g after 100 thermal cycling, which was only decreased by 0.89%, and there was almost no alloy leakage. This study has successfully realized that the ceramic thermal storage material possesses high thermal conductivity, high thermal storage density and excellent thermal cycling performance at the same time, and provides a new method for the production and preparation of Al-12Si/ceramic heat storage materials, which has great potential for application in heat storage systems.
使用金属作为相变材料(PCM)的蓄热陶瓷具有高导热性和高蓄热密度。但在使用过程中极易发生金属相变材料的泄漏,将严重影响蓄热陶瓷的使用寿命。本研究制备了以 Al-12Si 合金为相变材料的陶瓷复合相变蓄热材料。首先,通过溶胶-凝胶法和高温热处理对 Al-12Si 进行预处理,得到具有致密氧化铝外壳层的预处理 Al-12Si 合金粉末。然后,将预处理后的 Al-12Si 合金粉末分别与氧化铝、二氧化硅、氧化镁和莫来石混合压制,并在 1,100°C 、1,200°C 或 1,300°C 下烧结。实验结果表明,金属相变材料与四种陶瓷材料具有良好的化学相容性,预处理后的 Al-12Si 基本保持了初始形状,并均匀地分散在储热材料中。在所有样品中,烧结温度为 1,200°C 的预处理 Al-12Si/mullite 陶瓷蓄热材料的蓄热性能最好。样品的导热系数高达 17.94 W/(m-K)。热循环前的潜热存储值为 139.51 J/g,热循环 100 次后为 138.27 J/g,仅下降了 0.89%,而且几乎没有合金泄漏。该研究成功实现了陶瓷蓄热材料同时具有高导热系数、高蓄热密度和优异的热循环性能,为 Al-12Si/ 陶瓷蓄热材料的生产和制备提供了一种新方法,在蓄热系统中的应用潜力巨大。
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引用次数: 0
A Succinct review of strengths, weaknesses, opportunities, and threats (SWOT) analyses, challenges and prospects of solar and wind tree technologies for hybrid power generation 对太阳能和风能混合发电技术的优势、劣势、机会和威胁(SWOT)分析、挑战和前景的简要回顾
IF 3.4 4区 工程技术 Q3 ENERGY & FUELS Pub Date : 2024-08-23 DOI: 10.3389/fenrg.2024.1417511
Kumaresen Mohanaravi, Mahendran Samykano, Adarsh Kumar Pandey, Muhamad Mat Noor, Kumaran Kadirgama
IntroductionThe increasing global demand for sustainable energy solutions highlights the urgency of exploring renewable resources, particularly sunlight, which is abundant and virtually limitless. This study reviews innovative technologies like solar trees, wind trees, and hybrid solar-wind trees, which are emerging as efficient structures for harnessing renewable energy.MethodsA comprehensive SWOT analysis was conducted to evaluate the strengths, weaknesses, opportunities, and threats associated with solar, wind, and hybrid trees. The analysis also considered sustainability aspects, focusing on the efficiency and practicality of these technologies in various settings.ResultsSolar trees mimic natural foliage, utilizing solar modules to convert sunlight into electricity, while wind trees incorporate micro-wind turbines and solar panels, effectively harnessing both wind and solar energy. Hybrid solar-wind trees combine these technologies to provide a consistent energy supply. These structures are compact, cost-effective, and adaptable to urban landscapes.DiscussionChallenges such as land use, aesthetic considerations, and public perception were identified. The review emphasizes the need for future research to optimize configurations and address these challenges, ensuring the successful integration of these technologies into sustainable urban landscapes.ConclusionThis review provides critical insights for renewable energy researchers, particularly in the development of hybrid wind and solar power systems, promoting energy security and climate resilience.
导言:全球对可持续能源解决方案的需求日益增长,这凸显了开发可再生资源的紧迫性,尤其是充足且几乎无限的阳光。本研究综述了太阳能树、风能树和太阳能-风能混合树等创新技术,这些技术正在成为利用可再生能源的高效结构。方法 对太阳能树、风能树和混合树的优势、劣势、机会和威胁进行了全面的 SWOT 分析。结果太阳能树模仿自然树叶,利用太阳能模块将太阳光转化为电能,而风能树则结合了微型风力涡轮机和太阳能电池板,有效地利用了风能和太阳能。太阳能-风能混合树将这些技术结合起来,提供稳定的能源供应。这些建筑结构紧凑、成本效益高,可适应城市景观。本综述强调了未来研究优化配置和应对这些挑战的必要性,以确保这些技术成功融入可持续城市景观。
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引用次数: 0
Cloud-edge collaborative high-frequency acquisition data processing for distribution network resilience improvement 云边缘协作式高频采集数据处理,提高配电网抗灾能力
IF 3.4 4区 工程技术 Q3 ENERGY & FUELS Pub Date : 2024-08-07 DOI: 10.3389/fenrg.2024.1440487
Sanlei Dang, Jie Zhang, Tao Lu, Yongwang Zhang, Peng Song, Jun Zhang, Rirong Liu
To realize transparent monitoring and resilience improvement of low-voltage distribution network, both the data acquisition scope and frequency have been greatly expanded. Cloud-edge collaboration leverages the edge server’s real-time response capabilities and the cloud server’s robust data processing power to enhance the performance of high-frequency data acquisition processing. Nonetheless, it continues to confront challenges such as the entanglement of optimization variables, the presence of uncertain information, and a lack of awareness regarding acquisition frequencies. In this paper, we propose a machine learning-based cloud-edge collaborative data processing optimization algorithm to minimize the weighted sum of data processing delay and device energy consumption for distribution network resilience improvement. The joint optimization problem is decoupled into device-edge data offloading subproblem and edge-cloud data splitting subproblem, which are solved by the proposed upper confidence bound (UCB) based frequency-aware device-edge data offloading optimization algorithm and the exponential-weight algorithm for exploration and exploitation (EXP3) based edge-cloud data splitting optimization algorithm, respectively. Simulation results show that the proposed algorithm is superior to existing algorithms in performances of energy consumption and total processing delay.
为实现低压配电网的透明监控和弹性提升,数据采集的范围和频率都得到了极大的扩展。云边协同利用边缘服务器的实时响应能力和云服务器强大的数据处理能力,提高了高频数据采集处理的性能。然而,它仍然面临着优化变量的纠缠、不确定信息的存在以及缺乏对采集频率的认识等挑战。在本文中,我们提出了一种基于机器学习的云边协同数据处理优化算法,以最小化数据处理延迟和设备能耗的加权和,从而提高配电网的弹性。联合优化问题被解耦为设备边缘数据卸载子问题和边缘云数据拆分子问题,分别由提出的基于置信上限(UCB)的设备边缘数据卸载优化算法和基于指数加权算法的边缘云数据拆分优化算法来解决。仿真结果表明,所提出的算法在能耗和总处理延迟方面优于现有算法。
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引用次数: 0
Model predictive control for single-phase cascaded H-bridge photovoltaic inverter system considering common-mode voltage suppression 考虑共模电压抑制的单相级联 H 桥光伏逆变器系统的模型预测控制
IF 3.4 4区 工程技术 Q3 ENERGY & FUELS Pub Date : 2024-08-07 DOI: 10.3389/fenrg.2024.1371239
Xinwei Wei, Wanyu Tao, Xunbo Fu
In this article, a model predictive control (MPC) with common-mode voltage (CMV) suppression is proposed for single-phase cascaded H-bridge (CHB) inverters, which can also simultaneously achieve control objectives of grid-connected current tracking, voltages balancing of different H-bridge submodules on the DC-side and switching frequency reduction. To suppress high-frequency components of the common-mode voltage without additional switching devices, the algorithm proposed designs the predicted and reference values of the CMV and incorporates them in the cost function. At the same time, the capacitor voltages balancing control is integrated in the calculation of the optimal modulation function of the H-bridge, which reduces the complexity of control effectively. Besides, switching times of the MOSFETs are compared in two cycles. The cost function is constructed to represent comprehensive effect of the control. Finally, an experiment is performed on the hardware-in-the-loop experimental platform. The experimental results show that the proposed algorithm can offer a better voltage THD and reduce the times of switch action by nearly half while maintaining high-precision current tracking and maximum power point of photovoltaic modules, which alleviate the potential electromagnetic interference and cabling problem.
本文针对单相级联 H 桥 (CHB) 逆变器提出了一种具有共模电压 (CMV) 抑制功能的模型预测控制 (MPC),它还能同时实现并网电流跟踪、直流侧不同 H 桥子模块的电压平衡以及降低开关频率等控制目标。为抑制共模电压的高频分量而无需额外的开关设备,所提出的算法设计了 CMV 的预测值和参考值,并将其纳入成本函数。同时,在计算 H 桥的最佳调制功能时,还纳入了电容器电压平衡控制,从而有效降低了控制的复杂性。此外,MOSFET 的开关时间在两个周期内进行比较。构建了成本函数来表示控制的综合效果。最后,在硬件在环实验平台上进行了实验。实验结果表明,所提出的算法可以提供更好的电压总谐波失真(THD),并将开关动作时间减少近一半,同时保持高精度的电流跟踪和光伏组件的最大功率点,从而缓解了潜在的电磁干扰和布线问题。
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引用次数: 0
Smart home load scheduling system with solar photovoltaic generation and demand response in the smart grid 智能电网中带有太阳能光伏发电和需求响应功能的智能家居负荷调度系统
IF 3.4 4区 工程技术 Q3 ENERGY & FUELS Pub Date : 2024-08-07 DOI: 10.3389/fenrg.2024.1322047
Lyu-Guang Hua, S. Haseeb Ali Shah, Baheej Alghamdi, Ghulam Hafeez, Safeer Ullah, Sadia Murawwat, Sajjad Ali, Muhammad Iftikhar Khan
This study introduces a smart home load scheduling system that aims to address concerns related to energy conservation and environmental preservation. A comprehensive demand response (DR) model is proposed, which includes an energy consumption scheduler (ECS) designed to optimize the operation of smart appliances. The ECS utilizes various optimization algorithms, including particle swarm optimization (PSO), genetic optimization algorithm (GOA), wind-driven optimization (WDO), and the hybrid genetic wind-driven optimization (HGWDO) algorithm. These algorithms work together to schedule smart home appliance operations effectively under real-time price-based demand response (RTPDR). The efficient integration of renewable energy into smart grids (SGs) is challenging due to its time-varying and intermittent nature. To address this, batteries were used in this study to mitigate the fluctuations in renewable generation. The simulation results validate the effectiveness of our proposed approach in optimally addressing the smart home load scheduling problem with photovoltaic generation and DR. The system achieves the minimization of utility bills, pollutant emissions, and the peak-to-average demand ratio (PADR) compared to existing models. Through this study, we provide a practical and effective solution to enhance the efficiency of smart home energy management, contributing to sustainable practices and reducing environmental impact.
本研究介绍了一种智能家居负载调度系统,旨在解决与节能和环境保护有关的问题。研究提出了一个全面的需求响应(DR)模型,其中包括一个旨在优化智能家电运行的能耗调度器(ECS)。ECS 采用了多种优化算法,包括粒子群优化算法 (PSO)、遗传优化算法 (GOA)、风驱动优化算法 (WDO) 和混合遗传风驱动优化算法 (HGWDO)。这些算法相互配合,在基于价格的实时需求响应(RTPDR)下有效地安排智能家电的运行。由于可再生能源具有时变性和间歇性,因此将其有效集成到智能电网(SG)中具有挑战性。为解决这一问题,本研究使用电池来缓解可再生能源发电的波动。仿真结果验证了我们提出的方法在优化解决智能家居负载调度问题方面的有效性。与现有模型相比,该系统实现了公用事业账单、污染物排放和峰均需求比(PADR)的最小化。通过这项研究,我们为提高智能家居能源管理的效率提供了一个实用有效的解决方案,有助于可持续发展实践和减少对环境的影响。
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引用次数: 0
Medium-voltage feeder blocks division method considering source-load uncertainty and characteristics complementary clustering 考虑源负载不确定性和特性互补聚类的中压馈线区块划分方法
IF 3.4 4区 工程技术 Q3 ENERGY & FUELS Pub Date : 2024-08-07 DOI: 10.3389/fenrg.2024.1452011
Jieyun Zheng, Zhanghuang Zhang, Ying Shi, Zhuolin Chen
Existing feeder block division methods fail to consider the complementary characteristics and uncertainty between power sources and loads, which result in excessive feeder blocks, low inter-block balance, and significant disparity in net load peak-valley difference. To address these issues, a medium-voltage feeder block division method that considers the uncertainty and complementary characteristics of sources and loads is proposed. Firstly, based on the probability density characteristics of sources and loads, an uncertainty model of DG output and load demand is established. Secondly, considering the constraints of block maximum load rate and feeder non-crossing, a feeder block division model is established. Additionally, a set of center circles is defined, and based on this, an improved K-means clustering algorithm is proposed. The initial clustering centers based on the center circles is set, and the clustering centers based on the arcs of the center circles corrected. And the weighted distances between power sources and clustering centers are calculated. An algorithm flow for improved K-means clustering feeder block division is designed accordingly. Finally, the case studies show that the result of block division is improved.
现有的馈线区块划分方法未能考虑电源和负载之间的互补特性和不确定性,从而导致馈线区块过多、区块间平衡度低、净负载峰谷差悬殊。针对这些问题,本文提出了一种考虑了电源和负载的不确定性和互补性的中压馈线区块划分方法。首先,基于电源和负载的概率密度特征,建立了 DG 输出和负载需求的不确定性模型。其次,考虑到区块最大负载率和馈线不交叉的约束条件,建立了馈线区块划分模型。此外,还定义了一组中心圆,并在此基础上提出了一种改进的 K-means 聚类算法。根据中心圆设定初始聚类中心,并根据中心圆的弧线修正聚类中心。并计算电源和聚类中心之间的加权距离。据此设计出改进的 K-means 聚类馈电块划分算法流程。最后,案例研究表明,区块划分的结果得到了改善。
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引用次数: 0
Stability analysis and stabilization control of a grid-forming VSC-HVDC system 形成电网的 VSC-HVDC 系统的稳定性分析和稳定控制
IF 3.4 4区 工程技术 Q3 ENERGY & FUELS Pub Date : 2024-08-07 DOI: 10.3389/fenrg.2024.1437287
Yi Lu, Gang Shi, Qian Chen, Peng Qiu, Jianqiao Zhou, Renxin Yang, Jianwen Zhang
As the penetration of the integrated intermittent and fluctuating new energy (e.g., wind and photovoltaic power) increases, the conventional grid-following voltage source converter (VSC)-based high voltage direct current (HVDC) transmission system faces the problem of interactive instability with the grid. A novel grid-forming control strategy is proposed to overcome these issues, which adopts the dynamics of a DC capacitor to realize the function of self-synchronization with the grid. Moreover, the per-unit DC voltage can automatically track the grid frequency, acting as a phase-locked loop. Next, the small-signal model of the grid-forming VSC-HVDC system is established, and the stability of the system is analyzed using the eigenvalue analysis method and the complex power coefficient method. In addition, the stabilization controller is proposed for the grid-forming (GFM) control structure, which further enhances the grid-forming VSC-HVDC system’s stability and helps it operate stably under both stiff and weak grid conditions. Research results show that the VSC-HVDC system under the proposed grid-forming control can work stably in both stiff and weak grids. The grid-forming VSC-HVDC system is robust and can maintain stable operations with a large range variation of the parameters in the current and voltage control loop. Simulations are carried out on the PSCAD/EMTDC platform to verify the proposed grid-forming control strategy.
随着间歇性和波动性综合新能源(如风能和光伏发电)渗透率的增加,传统的基于电压源变换器(VSC)的高压直流(HVDC)输电系统面临着与电网交互不稳定的问题。为克服这些问题,我们提出了一种新颖的成网控制策略,它采用直流电容器的动态特性来实现与电网自同步的功能。此外,单位直流电压可自动跟踪电网频率,起到锁相环的作用。接下来,建立了成网 VSC-HVDC 系统的小信号模型,并使用特征值分析法和复功率系数法分析了系统的稳定性。此外,还提出了成网(GFM)控制结构的稳定控制器,进一步增强了成网 VSC-HVDC 系统的稳定性,有助于其在硬电网和弱电网条件下稳定运行。研究结果表明,在拟议的成网控制下,VSC-HVDC 系统可以在僵电网和弱电网中稳定运行。成网 VSC-HVDC 系统具有很强的鲁棒性,在电流和电压控制环中的参数变化范围较大时也能保持稳定运行。在 PSCAD/EMTDC 平台上进行了仿真,以验证所提出的电网形成控制策略。
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引用次数: 0
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