查询词典 power distribution system

A state estimation algorithm based on Y-matrix is proposed. The method of equivalent current measurement transformation is adopted in power system state estimation for different types of measurement in transmission and distribution systems.

提出一种基于导纳矩阵方程的状态估计方法，针对输电系统和配电系统不同的量测类型，采用等效电流量测变换技术进行电力系统状态估计。

More than 80％ of the root system was at this layer. The vertical distribution of root weight and root volume could be expressed by exponential equation, power equation or polynomial equation.

各品种水稻根系重量均随土层深度增加而下降，但主要分布在土壤耕作层（0-20cm），而表层（0-10cm）就占80％以上。

Characteristics of power system frequency abnormal distribution.

电网频率的非正态概率分布特性。

An interconnected system for the distribution of electricity or electromagnetic signals over a wide area, especially a network of high-tension cables and power stations.

输电线路一个用来在广大地区内传递电力或电磁信号的内部相联的网络，尤指由高压电线和发电站组成的网络

This method can meet the inconstant characteristic and perfect the distribution of the var flow of complicated power system.

这种方法的缺点在于补偿量不能随电网参数波动而改变，不能动态解决无功分布不合理、电压波动大的问题。

Base on the principle, the main circuit and control circuit of 2-phase hybrid stepping motor systems are designed. The system can realize many functions such as fix-frequency pulse width modulation, current sampling, power magnifying, ring distribution, producing control signal, and so on.

完成了对二相混合式步进电动机微步驱动系统主电路及控制电路的具体设计，实现了恒频斩波、信号检测、环形分配、微步信号的产生等功能，并搭制了实验电路进行实验验证。

This paper presents a novel model of short-term trade planning in a competitive electricity pool, with the settlement rules involved in the objective function. Moreover, the concept of system marginal price is improved so as to reflect the reasonable distribution of benefits between transaction centers and suppliers. And the justice criterion from the standpoint of power plants is proposed, as well as the optimality criterion from the standpoint of transaction centers.

文中结合我国的实际情况，建立了以电网为核心的买电型短期交易计划的模型，提出了兼顾电网交易中心与发电商之间利益合理分配的浮动边际电价的新概念，并从电厂的角度给出了短期交易计划的公平性准则，从电网交易中心的角度给出了最优性判定准则。

At least three years of electrical engineering and system design experience; Experience in power generation and distribution is preferred

至少三年的电气工程师和系统设计经验，具有输配电行业经验者优先

For example, although Wuhan possesses an outstanding advantage in location, the city has not formed an industrial and business system of good overall arrangement with the surrounding areas in division, distribution and coordination of work, due to a serious rupture in economic quoits. Secondly, the strength in science and technology suffers a weak power in transformation that results in a brain drain and a decrease in scientific renovating ability. Moreover, a retarded development in industry and business has wasted the rich resources of skilled workforce, causing a lack of momentum that pushes forward the development of economy.In spite of an abundant supply of water resources, the city construction, due to deficiency in fund, still faces great difficulties with districts separated by the two rivers.

如武汉尽管有突出的区位优势，但由于经济圈层断档，与周边地区没有形成分工协作、布局合理的产业体系；科技实力雄厚，但科技转化能力不强，致使人才流失，科技创新能力下降；劳动力资源丰富，但由于产业发展滞后，致使大量熟练劳动力闲置，没有转化为经济增长的动力；水资源丰富，但由于资金不足，两江相隔给城市建设带来了较大的困难。

Fractal dimension ; Grey system ; Log data ; Power spectral analysis ; Normal distribution

分维；灰色理论；测井数据；功率谱分析；正态分布

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。