On the basis of the sustainable concept, organic compounds and carbon materials both mainly composed of light C element have been regarded as powerful candidates for advanced electrochemical energy storage (EES) syste...
详细信息
On the basis of the sustainable concept, organic compounds and carbon materials both mainly composed of light C element have been regarded as powerful candidates for advanced electrochemical energy storage (EES) systems, due to theie merits of low cost, eco-friendliness, renewability, and structural versatility. It is investigated that the carbonyl functionality as the most common constituent part serves a crucial role, which manifests respective different mechanisms in the various aspects of EES systems. Notably, a systematical review about the concept and progress for carbonyl chemistry is beneficial for ensuring in-depth comprehending of carbonyl functionality. Hence, a comprehensive review about carbonyl chemistry has been summarized based on state-of-the-art developments. Moreover, the working principles and fundamental properties of the carbonyl unit have been discussed, which has been generalized in three aspects, including redox activity, the interaction effect, and compensation characteristic. Meanwhile, the pivotal characterization technologies have also been illustrated for purposefully studying the related structure, redox mechanism, and electrochemical performance to profitably understand the carbonyl chemistry. Finally, the current challenges and promising directions are concluded, aiming to afford significant guidance for the optimal utilization of carbonyl moiety and propel practicality in EES systems.
The fault current limiter (FCL) has been envisaged as a feasible solution to defend against out-of-range short-circuit currents (SCCs) in power systems. However, the existing studies mainly sited and sized FCLs under ...
详细信息
The fault current limiter (FCL) has been envisaged as a feasible solution to defend against out-of-range short-circuit currents (SCCs) in power systems. However, the existing studies mainly sited and sized FCLs under deterministic fault scenarios. Moreover, the influences of FCLs on power systems are complex including dynamic aspects, which makes it extremely difficult to configure FCLs optimally. This paper proposes a risk-based many-objective FCL configuration framework. Specifically, a data-driven Proportional Hazard Model (PHM) is developed to evaluate the nodal long-term short-circuit probability considering equipment aging, weather statistics, and surrounding conditions. The risks in terms of out-of-range SCC, abnormal voltage sag, and transient instability are formulated as the objective functions of the FCL configuration model, as well as the overall FCL investment. The time-domain dynamic response process of FCLs is considered in both the SCC limiting and the transient stability simulation process, mainly in the form of a time-varying resistance. The state-of-the-art NSGA-III is deployed to search the Pareto-optimal FCL configuration solutions of the established many-objective FCL configuration problem. The numerical results verify that the risk-based model configures FCLs more economically with a 7.5% decrease of average FCL investment compared with the deterministic model.
Marine sports are an important part of experience economy. The research on the features and functions of marine sports conforms to the trend of marine economic development, and is of great significance to promoting th...
详细信息
Marine sports are an important part of experience economy. The research on the features and functions of marine sports conforms to the trend of marine economic development, and is of great significance to promoting the national fitness and economic development. This paper analyzes the development advantages of marine sports in different regions of China and studies the impacts of monsoon climate, ocean current and legal holiday on marine sport events. The results show that China's marine sports have the features of region, seasonality, diversity and holiday. As an important part of the experience economy in the new era, marine sports is of great significance to the national health, social and economic development and cultural exchanges at home and abroad. This paper puts forward the suggestion of combining marine sports with tourism culture according to the regional and seasonal features, which is of great reference significance for actively promoting the concept of marine sports and cultivating the marine sports market.
暂无评论