减轻水库破坏深度的多目标调度模型与方法

本文根据出力均匀化的原则建立多目标优化模型求解出调度方案 ,并结合水库实例计算 ,指导水库实际的调度以减轻水库破坏程度 .     

Price forecast in the competitive electricity market by support vector machine

The electricity market has been widely introduced in many countries all over the world and the study on electricity price forecast technology has drawn a lot of attention. In this paper, with different parameter C_i and ε_i assigned to each training data, the flexible C_i Support Vector Regression (SVR) model is developed in terms of the particularity of the price forecast in electricity market. For Day Ahead Market (DAM) price forecast, the load, time of use index and index of day type are taken as the major factors to characterize the market price, therefore, they are selected as the inputs for the flexible SVR forecast model. For the long-term price forecast, we take the reserve margin R^m, HHI and the fuel price index as the inputs, since they are the major factors that drive the market price variation in long run. For short-term price forecast, besides the detailed analysis with the young Italian electricity market, the new model is tested on the experimental stage of the Spanish market, the New York market and the New England market. The long-term forecast with the SVR model presented is justified by the forecast with the data from the Long Run Market Simulator (LREMS).     

Strategic bidding of offer curves: An agent-based approach to exploring supply curve equilibria

We model a market in which suppliers bid step-function offer curves using agent-based modeling. Our model is an abstraction of electricity markets where step-function offer curves are given to an independent system operator that manages the auctions in electricity markets. Positing an elementary and computationally accessible learning model, Probe and Adjust, we present analytic results that characterize both the behavior of the learning model and the properties of step-function equilibria. Thus, we have developed a framework for validating agent-based models prior to using them in situations that are too complicated to be analyzed using traditional economic theory. In addition, we demonstrate computationally that, by using alternative policies, even simple agents can achieve monopoly rewards for themselves by pursuing more industry-oriented strategies. This raises the issue of how participants in oligopolistic markets actually behave.     

频哪醇重排反应的研究进展

频哪醇重排反应是由1,2-二醇在酸催化下发生分子内重排脱水,生成频哪酮的反应。频哪酮是一种重要的有机化工中间体,广泛应用于农药、医学、染料等领域。本文综述了频哪醇重排反应的研究进展,主要包括频哪醇在高温液态水和超临界水中的重排反应;无机酸、路易斯酸和分子筛催化的反应;固相条件下的反应;以及光化学、电化学重排等方面的研究...     

Bidding in sequential electricity markets: The Nordic case

For electricity market participants trading in sequential markets with differences in price levels and risk exposure, it is relevant to analyze the potential of coordinated bidding. We consider a Nordic power producer who engages in the day-ahead spot market and the hour-ahead balancing market. In both markets, clearing prices and dispatched volumes are unknown at the time of bidding. However, in the balancing market, the market participant faces an additional risk of not being dispatched. Taking into account the sequential clearing of these markets and the gradual realization of market prices, we formulate the bidding problem as a multi-stage stochastic program. We investigate whether higher risk exposure may cause hesitation to bid into the balancing market. Furthermore, we quantify the gain from coordinated bidding, and by deriving bounds on this gain, assess the performance of alternative bidding strategies used in practice.     

电能表自动化检定压接过程动力学仿真分析

分析了电能表自动化检测中自动压接过程的运动状态,采用ADAMS软件对压接过程进行仿真,研究了检测装置内置弹簧的刚度系数、弹簧的预载对电能表与端子间接触力的影响;研究了压接速度对接触力大小的影响。仿真结果表明：内置弹簧的刚度系数越大,电能表与压接端子接触力越大;弹簧预载越大,接触力越大,二者皆与接触力呈线性关系。本文详细研究了检测装置内置弹簧对接触力的影响,为进一步改进电能表检测装置提供了重要的参考依据。     

A Hydrazine-Nitrate Flow Battery Catalyzed by a Bimetallic RuCo Precatalyst for Wastewater Purification along with Simultaneous Generation of Ammonia and Electricity

The traditional technologies for industrial and agricultural effluent treatment are often energy-intensive. Herein, we suggest an electrochemical redox strategy for spontaneous and simultaneous decontamination of wastewater and generation of both fuels and electricity at low cost. Using hydrazine and nitrate effluents as a demonstration, we propose a hydrazine-nitrate flow battery (HNFB) that can efficiently purify the wastewater and meanwhile generate both ammonia fuel and electricity with the assistance of our developed bimetallic RuCo precatalyst. Specifically, the battery delivers a peak power density of 12 mW cm⁻² and continuously operates for 20 h with an ammonia yield rate of ca. 0.38 mmol h⁻¹ cm⁻² under 100 mA cm⁻². The generated electricity can further drive a hydrazine electrolyzer to produce hydrogen fuel. Our work provides an alternative pathway to purify wastewater and generate high value-added fuels at low cost.     

基于可逆固体氧化物电池堆的电能高效存储

研究了固体氧化物电池堆中电能的可逆存储与产生,通过相变金属存储燃料电池模式下的热能并在电解池模式下加以利用. 系统的荷电状态(即氢燃料百分比)可显著增加开路电压,系统压力的增加有效提高了开路电压. 较高的系统压力可促进电极表面的物质扩散和输运,相应地改善电极的极化电阻. 通过有效的热能管理,系统的电能可逆存储的循环效率可高达92%.     

A new pricing scheme for a multi-period pool-based electricity auction

A new pricing scheme is proposed for determining the social welfare distribution in a centralized pool-based auction in the context of solving the unit commitment problems under competition. A significant contribution of this paper over previous publications on this subject is the inclusion of the price-responsive demand side for the multi-period auctions with dynamic commitment characteristics. The model allows every thermal unit and every consumer to obtain individual maximum profits, and at the same time it gives the market coordinator an adequate tool for solving the ensuing technologically constrained unit commitment problem with fair market clearing. The pricing model is in the form of a mixed linear programming model that minimizes the sum of the compensation costs. The accompanying case study illustrates the approach proposed.     

晚清科学译著《电学》初探

《电学》是我国近代第一部较系统、全面地介绍西方19世纪电磁学的中文译著,在中国近代物理学史和科学传播史上占有重要地位．对《电学》的英文底本和中译本进行了比较研究,首先介绍了《电学》译书的时代背景及原著者、译者的情况;梳理了中英文版本的《电学》章节和内容,并进行了对比分析,对书中涉及的电磁学知识和实用技术进行归类整理并择要介绍,对电磁学专业名词的翻译方法进行归纳和分析,对本书的翻译水平也给予了评价;最后,将《电学》与其前后出版的同类翻译著作做了比较,指出《电学》一书在电磁学专业翻译方面的开创性以及对其后诸多同类译著的示范和借鉴作用．