Tianjin City promotes the construction of power grid

A few days ago, Tianjin＇s leading group of power grid construction held the third meeting on which the work in 2006 was summarized in an all-round way and the work in 2007 was arranged.     

China published the construction cost of power projects

On June 19 this year, the regulatory information release on the construction cost of power projects in the 10th Five-Year Plan period, sponsored by the State Electricity Regulatory Commission of China (SERC) and co-sponsored by China Power Engineering Consulting Group Corporation and China Hydropower Engineering Consulting Group Corporation, was held in Ningbo,Zhejiang Province.According to the report on construction cost of the power projects having been put into operation during implementation of the 10th Five-Year Plan, the specific     

Quality monitoring of electrical power to evaluate the operational reliability of power equipment and active–adaptive voltage control in distribution power grids

Monitoring systems of power quality and operation mode parameters are currently being developed and widely introduced. These systems make it possible to receive needed information in different nodes of a grid in real time, as well as build up data archives over a long period of time. The presence of such information makes it possible to change the approach to short- and long-term control by distribution grids. This paper describes the possibilities of application of information obtained from a monitoring system to control distribution power grids using the example of reliability evaluation of power equipment to schedule the repairs, and active–adaptive voltage control system. The dependences are shown of probability of failure of power equipment on operation time under different types of load curves and power quality. The conclusion is drawn that the wear of main equipment significantly increases when it is operated in conditions of low power quality. The dependence is shown of changing repair and inspection frequency of equipment on operation time and operating conditions. This paper describes the structure and principles of operation of an active–adaptive voltage control system. As a test example, the amount of violations upon steady-state voltage deviations of power consumers in a distributed grid using different methods of voltage control in a power supply center are compared. It is shown that, at nonuniform load in the grid, the required voltage level cannot be provided by the counterload regulation method. The ease of use of a monitoring system of the power quality of operation mode parameters of power consumers makes it possible to use the control system providing a required voltage level for the greatest number of power consumers.     

Construction of Russia’s pilot binary power unit at the pauzhet geothermal power station

The basic process diagram and main technical solutions adopted in constructing the pilot 2.5-MW Pauzhet binary geothermal power station are described. Results obtained from an analysis of some principles of selecting the working fluid and optimizing the working parameters and operating modes of this power unit are presented.     

Both of the two large power grid corporations invest much capital in power grid construction

To change the lagging situation of power grid construction,the two large power grid corporations will invest much capital in the period of the11th Five Year.It is reported that the State Grid Corporation will inject more than800billion Yuan in power grid …     

Acid rain urges thermal power to quicken the pace of desulphurization

An investigation of the State Environmental Protection Administration shows that 38.6% of 343 cities in China have reached Grade II air quality. The administration held a meeting in Hangzhou in November this year and discussed how to enhance the construction and operation of desulphrization equipment of thermal power plants.     

Practical application of the benchmarking technique to increase reliability and efficiency of power installations and main heat-mechaniс equipment of thermal power plants

Data on the comparative analysis variants of the quality of power installations (benchmarking) applied in the power industry is systematized. It is shown that the most efficient variant of implementation of the benchmarking technique is the analysis of statistical distributions of the indicators in the composed homogenous group of the uniform power installations. The benchmarking technique aimed at revealing the available reserves on improvement of the reliability and heat efficiency indicators of the power installations of the thermal power plants is developed in the furtherance of this approach. The technique provides a possibility of reliable comparison of the quality of the power installations in their homogenous group limited by the number and adoption of the adequate decision on improving some or other technical characteristics of this power installation. The technique provides structuring of the list of the comparison indicators and internal factors affecting them represented according to the requirements of the sectoral standards and taking into account the price formation characteristics in the Russian power industry. The mentioned structuring ensures traceability of the reasons of deviation of the internal influencing factors from the specified values. The starting point for further detail analysis of the delay of the certain power installation indicators from the best practice expressed in the specific money equivalent is positioning of this power installation on distribution of the key indicator being a convolution of the comparison indicators. The distribution of the key indicator is simulated by the Monte-Carlo method after receiving the actual distributions of the comparison indicators: specific lost profit due to the short supply of electric energy and short delivery of power, specific cost of losses due to the nonoptimal expenditures for repairs, and specific cost of excess fuel equivalent consumption. The quality loss indicators are developed facilitating the analysis of the benchmarking results permitting to represent the quality loss of this power installation in the form of the difference between the actual value of the key indicator or comparison indicator and the best quartile of the existing distribution. The uncertainty of the obtained values of the quality loss indicators was evaluated by transforming the standard uncertainties of the input values into the expanded uncertainties of the output values with the confidence level of 95%. The efficiency of the technique is demonstrated in terms of benchmarking of the main thermal and mechanical equipment of the extraction power-generating units T-250 and power installations of the thermal power plants with the main steam pressure 130 atm.     

Projects of power sources approved

The National Development and Reform Commission has recently published 168 construction projects of power sources with a total generating capacity of 121,000 MW which were approved since 2004. The Bulletin No. 57, 2005 issued by the commission points out that in recent years, the national economy developed rapidly and the supply of electricity was relatively     

After the Depletion of Resources——Inspiration from transit of Fuxin from ＂city of coal power＂ to ＂city of wind power＂

Fuxin, Liaoning Province, the former ＂city of coal power＂ is depleted of resources because of over-exploitation. It did not, however, become devastated as some energy-depleted cities, but is making efforts in transition to a ＂city of wind power＂, a new type of energy base.     

An overview of the application of installation diagnostic technology in China''''s electric power industry

Installation diagnostic technology is a synthetic applied technol-ogy emerging recently,which is a methodology for evaluatingthe stress,worsening,fault,strength,function etc.,without disassem-bling the installation.The position,degree as well as cause of abnor-mality can be detected during operation using an installation diagno-sis system,thereby predicting and evaluating its reliability and deter-mining the repairing method.     

Wind power base is rising in the desert area of Northwest China

The first wind power project in Gansu, Yumen Wind Power Farm belonging to Gansu Jieyuan Company was built up in 1997. Up to 2005, there were 74 wind power units in operation in Jiajin Power Grid. Their installed capacity totaled 52.2 MW.At present, the third and fourth phase projects are under construction. These two projects will be equipped with 68x850 kW units. It is expected that all the units will     

Macroscopic analysis of optimum water power installed capacity in power system

There are two kinds of generating equipment in a firmly con-nected power network,one is water power plants(shortenedas“water power”,below),the other is thermal power plants(includingcoal-fired,oil-fired and nuclear power plants,but the analysis in thisarticle is based mainly on coal-fired power generation.And they willbe shortened as“thermal power”below).As far as power output isconcerned,when the share of water power installed capacity in     

Firsts of steam generator unit in the history of new China’s power industry

Unit eaPaeity(MW) 6 12 25 25 50 50100100125200300300300300330500600600600800900Name ofPowerPlant Tianj扭、nP.R Chongqing_P.R Fuxin P.P, ZhabeiP.P. FushunP.P. Zhabel P.P. JilinC卫. 一Ga匀ing P.P. wujinzP.P._ ChaoyangP.P. wangting只P. 饰omengP.R Yuanbaoshan RP shihengP卫、 Dalate P.P一 ShentouNo.2 P.P‘ PingweiP.P.一、勺anbaoshanP.只、HarbinNo.3 P.P一 SuizhongP、P.叭厄igaoqiaoN。念G.C.Ndte.’ P.P.一PowerP白n心CP.一山g‘nerationP勿nt,’ G.C一GenerationCo刀切anyFirsts …     

Development of power industry in Chongqing

The policy of reform and opening to the outside world has brought about a historical opportunity for the power industry of Chongqing to develop rapidly. In 1992, two 360-MW units of Huaneng Luohuang Power Plant went into operation. In 1995, the total installed capacity of Chongqing Power Plant came up to 800 MW after extended. In 1996, Chongqing became a municipality directly under the Central Government, which created another great opportunity for further development of the power industry in Chongqing. Till the year, the installed capacity of the whole city reached 2993.1 MW and the annual generation totaled 13.316 TWh. The electricity sold of the national grid was 11.382 TWh. There were 299 substations (35-220 kV) with an aggregate capacity of 6564.6 MVA and 35-500 kV transmission lines of 9157.76 km in length. By the end of 2005, the installed capacity and the annual generation were 5645.4 MW and 25.112 TWh respectively. The electricity sold of the national grid amounted to 28.934 TWh. There were 458 substations (35-500 kV) with an aggregate capacity of 24,693.7 MVA and 35-500 kV transmission lines of 14,932.14 km in length.     

Guangdong''''s desulphurization plan of power plants

Guangdong will completely carry out an environmental protectionplanning to strictly control SO2 emission,shut down and closesmall thermal power units with serious pollution and enhanceatmospheric quality control.     

Viable transformation of an electric utility? The case of the Puerto Rico electric power authority

There are similarities that Puerto Rico’s electric grid transformation has with other jurisdictions in terms of integration of distributed energy resources (DERs), net energy metering (NEM) and a diversified energy mix. However, it is important to first evaluate the impacts of Puerto Rico’s debt restructuring in view of federal emergency funds to be deployed. This paper aims to analyze expected impacts of the restructuring agreement and related plans on Puerto Rico’s economy and on its electric utility, PREPA. A restructuring agreement, and related plans, that considers a charge that starts at 2.768 cents per Kwh; that its length is 47 years; that comprises a nonbypassable and unavoidable charge, including on energy generated by consumers; and that excludes the regulator from the evaluation and implementation of debt restructuring charges, it is worth to analyze.     

Stability improvement of power system by simultaneous AC–DC power transmission

This paper presents a concept of improving the transient stability of power system by simultaneous AC–DC power transmission through a transmission line. A double circuit long transmission line is converted to simultaneous AC–DC line for feasibility study. Loss of synchronism is prevented by quickly producing sufficient decelerating energy to counteract accelerating energy gained during fault and subsequently due to loss of line after clearing the fault. Fast controllability and modulation of DC component is utilized to achieve this feature. The system under consideration is found to remain stable under transient condition up to transmission angle of 80°. Simulation study on PSCAD/EMTDC is carried out to validate the concept.     

SG has an inkling of the nth Five-Year Plan for power grid development

The SG is drawing up the 11 th Five-Year Plan and a report on 2020 long-term planning for power grid development. Preliminary analyses indicate that the corporation will have newly-added 330-kV and above transmission lines of 60,000 km and a substation capacity of 300 GVA, and make an investment of     

Improving the accuracy of multisided travelling wave determination of location of a fault in a power line by means of the difference–distance-measuring technique

The double-ended travelling wave method of determination of location of a fault in electrical networks has significant errors due to changes in the propagation velocity of electromagnetic waves. We have developed a travelling wave method of improving the accuracy of location of a fault determination in power transmission lines that is based on navigation algorithms. The method is applicable to lines with branches. The distance to fault determination for the developed method is up to twice as accurate as the double-ended travelling wave location of a fault method. The accuracy of the developed method is less influenced by external factors (change of sag, soil resistance, the instantaneous value of the current at the fault time) than is the accuracy of the double-ended travelling wave location of a fault method. The proposed method allows reducing the errors in determining distance to the location of a fault, and its accuracy is less affected by external factors. The developed method can be incorporated into existing and prospective devices based on travelling wave methods of location of a fault determination.