基于If-Then-Else规则的热电联产系统能量调度方法

为了降低热电联产系统能量调度算法计算的复杂度,减少计算时间,提出了一种基于If-Then-Else规则的热电联产系统能量调度方法。通过引入逻辑变量来描述设备的启停状态和工作模式,建立混合逻辑动态模型,在模型预测控制的框架下,根据实时电价以及本地能源、电力负荷和热力负荷的预测结果,为模型中的二元决策变量赋值,从而将模型中的混合整数线性规划问题转化为线性规划问题。最后,通过仿真将本文提出的方法和混合整数线性规划方法进行比较,结果表明,本文所采用的方法在性能上几乎没有损失,平均计算时间降低65%。     

热电联产和区域供热对减少CO2排放的贡献

CO2作为一种温室气体,是全球气候变暖的主要原因。采用热电联产和区域供热是抑制CO2排放的有效手段。文章通过世界上一些代表性国家的统计数据对此进行了说明,并对我国的情况进行了分析。     

冷热电联供系统运行模式优化

以最小运行费用和最小一次能耗率为目标函数,基于非线性规划和动态规划,利用MATLAB对冷热电联供系统的运行模式进行优化。通过与常规供能方式的比较,为建筑供能方案初设提供辅助设计。     

英国和欧洲的热电联产_热电联产工程系列报告之二

通过对英国在热电联产工程方面的现状、水平、效益、经营方式及发展前景等进行全面、系统、概括的介绍、旨在引起广大热能动力工作者及相关机构和部门的兴趣和重视,并系统考虑抓紧进行自己的工作。     

偏差电量考核下风光储混合发电商的市场均衡博弈研究

为了更直观地分析风光储混合发电商对市场均衡博弈结果和市场力的影响,在偏差电量考核衡量风光储混合发电出力随机波动性的基础上,综合考虑各发电商的出力限制和储能系统的运行约束,建立以风光储混合发电商和传统发电商收益最大化为目标的市场均衡博弈模型,调用CPLEX软件求解利用非线性互补函数处理得到的混合整数规划模型,并对比分析了风光储混合发电商作为价格接受者和影响者参与电力市场竞争对均衡博弈电价和投标出力的影响。结果表明,风光储混合发电商参与电力市场竞争可抑制传统发电商的市场力,对电价有显著的\"削峰填谷\"作用;当风光储混合发电商作为价格影响者时,对电价的影响会减弱,但其收益有所增加。     

区域供热技术在希腊国内供热中的有效应用

希腊的区域供热始于1994年,采用热电联产技术向用户供热。预计目前在建项目完成以后,总装机容量将超过300MW,其中约85％为现有燃煤机组,其余16％主要是烧柴油和液化石油气的调峰机组。目前用户数量已超过25000户,供热建筑超过6000幢。由于区域供热价格具有竞争力,且初始投资成本低,所以时希腊而言尤其具有吸引力。随着希腊能源市场自由化以及输气管线的完善,区域供热技术将在能源和环保领域产生更大的效益。     

Theoretical research of a silica gel–water adsorption chiller in a micro combined cooling,heating and power (CCHP) system

A novel micro CCHP system, which is based on a two bed silica gel–water adsorption chiller, is constructed in this work. To reveal the chiller characteristic in this system, a transient model of the adsorption chiller is developed. According to the comparison of the simulated results and experimental data, the presented model shows a good performance in predicting the chiller performance, with both stable and variable heat source temperature. With the analysis of simulated results, it is found that the cooling capacity and the coefficient of performance (COP) of the chiller are influenced significantly by the average value and variation rate of electric load, as well as the average value of cooling load. The water tank also shows a great effect on the chiller performance. To get better performance of the chiller, the water tank should be adopted when the electric load is low or its variation rate is positive, and should not be utilized when the electric load is high or its variation rate is negative. A 500 L water tank is recommended in order to get better performance and acceptable start-up time. Furthermore, to get better performance as well as higher security, a cold accumulator should be adopted.     

天然气热电冷联产的技术方案分析

天然气热电冷联产(CCHP)由于其较高的能源利用率,在全世界范围内得到了迅速的发展和广泛的利用。目前国内外相关设备已经比较成熟,因而热、电、冷相关技术参数的匹配便成为该总能系统中的技术关键,并在很大程度上影响到系统的经济效益。介绍了天然气热电冷联产系统的基本概念及发展应用情况,然后以国内某工厂CCHP系统的设计为实例,对“以热定电”和“以电定热”两种技术方案进行了参数计算和方案比较,并确定了“以电定热”的推荐方案。     

基于有机朗肯循环的生物质能热电联产技术的研究

阐述了中国生物质能开发和利用的前景,总结比较了国内外不同的生物质能热电联产技术,提出并介绍了基于有机朗肯循环(ORC)的生物质能热电联产技术。最后,讨论了ORC在回收余热、废热和冷能等方面的应用。     

Practical modelling of micro combined heat and power applications for local authority district heating schemes

The primary purposes of this paper are to describe a practical model which can be used to assist economic evaluation of district heating proposals, with particular reference to potential micro combined heat and power (CHP) applications, and to discuss the results of applying this model to a proposal for a particular scheme. The problems of realistic simulation of demand patterns, and the sensitivity of micro-CHP project values to scale, fuel prices, differential purchase/selling tariffs for electricity, duty cycle and plant utilization factors are discussed. Of several options, two were shown to be economically viable, relative to existing methods of supply (gas-fired boilers); however, the margin of benefit is small relative to wisely chosen modern boiler installations. A brief discussion of alternative methods of finance is provided; ceteris paribus, the proposed scheme would not be likely to attract venture capital from would-be lease-hire agencies. There is scope however for pilot schemes, whose results could be used to define more closely the limits of uncertainty of, for example, annual availability and duty cycle influences on the cost economics of operations.     

Estimating future balancing power requirements in wind–PV power system

This paper presents a general model—based on the Monte Carlo simulation—for the estimation of power system uncertainties and associated reserve and balancing power requirements. The proposed model comprises wind, PV and load uncertainty, together with wind and PV production simulation. In the first stage of the model, wind speed and solar irradiation are simulated, based on the plant disposition and relevant data. The second stage of the model consists of wind speed, PV power and load forecast error simulation, based on the associated statistical parameters. Finally, both wind and PV forecast error are combined with the load forecast error, resulting in the net uncertainty. This net uncertainty, aggregated on a yearly level, presents a dominant component in balancing power requirements. Proposed model presents an efficient solution in planning phase when the actual data on wind and PV production is unavailable.     

基于AA-CAES的冷热电三联产系统的热经济性分析

为了研究储热罐内热量的分配和利用对先进绝热压缩空气储能系统性能的影响,提高系统在可再生能源并网应用中的效率与经济性,提出5种热量分配方案。采用数值模拟的方法,比较系统5种方案下的热力学与经济学特性,并研究关键参数对不同方案下系统性能的影响。结果表明：热量分配比越大,循环效率越高,而年利润率越小。对于5种热量分配方案,循环效率和年利润率随储气室最大压比的增大均存在最小值,且存在最佳的换热器效能,使得循环效率和年利润率具有最大值。压缩机入口温度的变化对5种热量分配方案的循环效率和年利润率的影响各不相同。系统年利润率随着燃料价格的升高而减少,而随着产品价格的升高而增加。