Industrial Electric Energy Efficiency and Influential Factors in China

As traditional single-factor electricity intensity can not reveal the real electricity consumption efficiency accurately, this study applies the data envelopment analysis (DEA) approach to calculale the total-factor electricity consumption efficiency of China’s 33 industrial sectors from year 1998 to 2007, and uses the Tobit model to analyze the influential factors of electric energy efficiency. The result shows that China’s industrial electricity efficiency is universally low. Further study shows that industrial structure and technological progress have positive influence on consumption efficiency, while industry concentration and electricity price have negative influence on consumption efficiency. The effect of property right structure is fluctuated. Therefore, to optimize industry structure, promote technological progress, maintain competition, and deepen the reform of electricity price are beneficial for the improvement of electric energy efficiency.     

Double Pressure on Power Grids——The demand for electricity is dropping while the electricity price is not adjusted properly

Since October 2008,China‘s social consumption of electricity had,for the first time,grown negatively compared to the same period of the previous year,and in November the negative growth range further expanded. The major pressure faced by the electricity industry has now turned from the contradiction between coal and electricity to electricity quantity. This is undoubtedly a true and new test to electricity enterprises which get used to high growth but are now suffering great losses. The reform of electricit...     

How Should Generation Enterprises Deal with Crisis?

Since October 2008,China‘s social consumption of electricity had,for the first time,grown negatively compared to the same period of the previous year,and in November the negative growth range further expanded. The major pressure faced by the electricity industry has now turned from the contradiction between coal and electricity to electricity quantity. This is undoubtedly a true and new test to electricity enterprises which get used to high growth but are now suffering great losses. The reform of electricit...     

Countermeasures against Crisis by Generation Enterprises

Since October 2008,China‘s social consumption of electricity had,for the first time,grown negatively compared to the same period of the previous year,and in November the negative growth range further expanded. The major pressure faced by the electricity industry has now turned from the contradiction between coal and electricity to electricity quantity. This is undoubtedly a true and new test to electricity enterprises which get used to high growth but are now suffering great losses. The reform of electricit...     

Gather Strength and Wait for Opportunities

Since October 2008,China‘s social consumption of electricity had,for the first time,grown negatively compared to the same period of the previous year,and in November the negative growth range further expanded. The major pressure faced by the electricity industry has now turned from the contradiction between coal and electricity to electricity quantity. This is undoubtedly a true and new test to electricity enterprises which get used to high growth but are now suffering great losses. The reform of electricit...     

Beijing to build world-class urban power network

In2005,the maximum load and electricity consumption of the whole society in Beijing came up to10,650MW and57.05TWh respectively,both hitting an all-time high.Urban power network is an important infrastructure of a city.Consequently,the construction of a p…     

Electricity Supply and Consumption

In 2004, the total yearly electricity generation amounted to 2194.4 TWh, it was 15.18% over the previous year and a net increase of 289.2 TWh. Of which, hydro-electricity amounted to 331 TWh, or 17.65% increased, thermal electricity amounted to 1810.4 TWh, or 14.66% increased over the previous year, which accounted for 82.50% of the nation＇s total. The nuclear electricity generation grew steadily and the yearly generation amounted to 50.5 TWh, or 15.08% increased over the previous year.     

Power demand forecast for 2011 by China Electricity Council

The China Electricity Council published the report on the analysis of power supply and demand situation across the country in 2011 recently.According to the report it is forecasted that in 2011, China’s economy will keep steady and fast growth, and power demand will continue to increase. The electricity consumption of the whole society across the country will reach about 4 700 TWh with a year-on-year growth of about 12%, which will slow down to some extent as compared with 2010. With the implementation of industrial development, energy-saving measures and tariff policies, the growth and structure of electricity consumption will be greatly improved.     

Economic Dispatch of Smart Distribution Networks for Electricity Cost Reduction

Consumers＇ electricity cost keeps increasing over the time in most countries across the world. The main reason is that importing electricity from generation plants far from a load center is relatively expensive, as costs are paid not only for generation but also for energy loss and network use. To this end, it is more economi- cal to use electricity generated by local distributed generations. In order to reduce customers＇ electricity cost, a new economic dispatch of smart distribution networks is proposed. Economic dispatch of smart distribution network is to meet load demand with the least consumers＇ electricity cost considering distributed generators, while recognizing all operational limits of generation and transmission facilities in a distribution network. Case study shows that consumers＇ electricity cost can be reduced by about 200/o through economic dispatch of distri- bution network. Further, generation cost and emission of distribution network are reduced as well.     

China’s power consumption to rebound

China’s power consumption is expected to rise 4 percent to 6 percent year-on-year in the fourth quarter as the country’s economy is stabilizing. That will bring electricity consumption in the entire year to 4.94 TWh, up 5 percent from a year earlier, the China Electricity Council said on October 30. According to CEC, the country’s total installed power generation capacity will hit 1.14 TWh at the end of this year. Power demand and supply will be balanced because there are     

洗浴废水热量循环再利用可行性研究及应用

本文对洗浴废水热量循环再利用进行了可行性研究和实验验证,更重要的是通过洗浴废水热量循环再利用方案的推广应用,单个家庭单台电热水器年节约用电可以达到200度,按照中国电热水器保有量7000万台计算,一年节约用电140亿度,折合560万个寒庭的年用电量。     

“以电代油”在油田钻井系统的应用及其效益

油田用于钻探石油的机械钻机和电动钻机的动力来源都是柴油燃料。大庆油田工业电网电源非常普遍,将燃油模式改为用电模式经济效益非常可观,且有利于环境保护。进行井队燃油驱动钻机与电驱动钻机同工况的实例对比,分析了油田供电方案的效益指标,促进“以电代油”项目在钻井系统的应用。     

计及电源结构时空特性的电能替代评价

现有需求侧管理节能评价方法无法量化由终端设备用能种类改变产生的节能效果,传统电能替代评价方法无法计及基于电力网络潮流的真实电源结构对评估结果的影响。建立了一种计及电力网络、电源结构和用户用电方式的电能替代节能减排评价模型,提出和推导了计及清洁能源消纳的电力能耗系数和电力煤耗系数,用于表征电力系统能耗水平,并从用能全过程的角度量化广义节能下的电能替代项目节能量和减排量。算例分析了电力能耗和煤耗系数的时空特性,建立典型场景数据库,以电动汽车为代表说明通过需求响应和储能优化电能替代项目的运行对评估指标具有积极影响。     

大庆油田抽油机分布式风网互补供电系统可行性研究

根据1981-2010年期间气象测风塔实测数据分析,大庆地区达到了风能较丰富区的指标,有利于风力发电机有效利用.为此,提出在油田采区内布置中、小型风力发电机,与周边数台抽油机构成分布式风网互补供电系统的方案.优先利用风电,不足的部分由网电补充.对1台30 kW风力发电机为两台抽油机供电的方案进行测算,其结果表明,年节约电费1.58万元、减少污染物排放69.24 t.从风电技术、经济效益、环境保护等方面进行的可行性分析可知,此方案在技术和经济上切实可行.     

基于功率或电量预测的智能配电网统计线损同期化方法

智能配电网中电量采集数据缺失、遗漏导致按月线损统计不是严格意义上的自然月。为解决线损统计不同期问题,提出基于功率或电量预测的方法来改善配网线损统计。通过挖掘售电量数据,提出了一种基于年度售电量的灰色预测结果。再根据季度、月度层级占比得到月售电量的预测方法,与实际值的平均相对误差仅为1.94%,证明此方法简单有效适合电力各部门的广泛应用。将月售电量预测结果应用于线损统计,结合供电比例系数法,改善表计供、售电量不对应的问题,使得同期化,对按月实时分析网损有实际意义。     

电力市场的日有功优化调度

在电力市场条件下,电力系统日有功调度已由单纯的电能供需平衡分配过渡到追求全网总共电成本最小、寻求用户电价最低为目标。针对这一特点,提出了在多约束的条件下,寻求全网经济效益最优的两步简单求解法。首先应用优先级法以求得机组经济组合,然后再采用改进型优先顺序法进行经济负荷分配。该方法还可应用于水火电混合电力系统和互联电力系统的日有功优化调度。该研究成果已被开发成软件系统,投入省级电网的调度运营,效益十分显著。     

电力投资 输变电投资行情看好 电站设备步入阶段性顶部

中国经济的快速发展,带来了全社会用电量和电力投资的持续增长。2007年中国经济的快速发展,带动我国全社会的用电量达到26726亿千瓦时,同比增长15%;电量达20111亿千瓦时,同比增长16.4%。这些发展,使得我国电力行业的投资呈逐步增长趋势,其投资结构也正逐步趋于优化。输变电设备行业投资前景看好,而电站设备已步入本轮周期的阶段性顶部。     

能耗管理系统不同数据预测模型的比较研究

分析了建筑能耗的影响因素,建立了BP神经网络预测模型,基于径向基网络的预测模型和灰色BP神经网络预测模型。并以上海某大型公司建筑原始用电能耗统计数据作为样本,采用Matlab对预测模型进行仿真预测,分别得到公司建筑用电量峰电、谷电和平电的预测结果。结果表明,灰色BP神经网络预测效果较好。     

华东地区电动汽车发展趋势及用电需求预测

对2020-2040年华东地区电动汽车用电需求进行预测。首先对华东地区电动汽车保有量进行预估,然后利用平均用电量法和油耗计算法分别预测电动汽车的用电耗能情况。最后分情景对电动汽车引起的用电负荷进行预测。结果显示,华东地区电动汽车保有量2020-2030年快速增长,年均增长率为79.11%,2040年达到3720万辆。电动汽车引起的用电需求2020年、2030年和2040年分别为7 TWh、132 TWh和198 TWh,年均增长率从24.60%降至4.11%,2020-2040年整体年均增长率超过18%。2040年电动汽车年均用电负荷增长率为2.27%,最低负荷为41859 MW,最高负荷为93021 MW。     

考虑临时驻车充放电管理的电动汽车配送路径规划方法

随着充电基础设施保障能力的提升,电动汽车配送工作过程中的长时间驻车行为与电网存在的交互行为与能量转移存在研究价值。为提高电动汽车参与物流配送的效率,提出日调度背景下考虑临时驻车充放电管理的电动汽车配送路径规划方法。计及实时电价、车载电量、载货限重、单侧送达时间窗约束,考虑电池损耗、充电站服务时间、分时电价及实时服务费,构建以配送时间、耗电成本、车辆成本、配送延迟惩罚之和最小为目标的电动汽车配送路径优化模型,采用模拟退火改进的非支配排序遗传算法求解。以某26节点路网系统为算例,验证了所提方法能有效减少配送总成本,降低续航不足的风险,提升交通与能源互动潜力。