Advanced Materials Research Vols. 1008-1009

Abstract: On the basic of deeply analyzing the characteristic of circulation economy power system with high penetration of wind power, and researching the model and transient characteristics of DFIG, the problem on transient stability of circulation economy power grid was given through simulating and analyzing the huolinhe circulation economy demonstration project on wind power consumed in the local in the paper. At last, an optimal control strategy of wind turbine based on circulation economy power system with high penetration of wind power was proposed.

Abstract: According to the characteristics of the wind farm measuration, this paper presents a Fine and Robust State Estimation method for solving residual contamination problem caused by large-scale wind power integration. This method introduces the reference value of measurement type into the weight function and uses the pre-check information of state estimation measurement to do SCADA measurement pretreatment, and then form the bad data reference factor to assist positioning the bad data of measurement. Finally, the simulation tests of a regional power grid to prove that the proposed method can effectively identify telemetry bad data of wind farms eliminate residual pollution caused by it, which improve the accuracy of the State Estimation.

Abstract: In view of the disadvantage existing in stochastic programming and fuzzy programming that in the process of modeling of wind power both of them need a huge amount of historical data information to establish precise model, and the advantage of interval planning that it only need to know the upper and lower bounds of the variable in the uncertainty modeling and interval variables contains more information than real variables, this paper puts forward the interval model of the wind power, and use the interval possible degree to deal with the interval constraint conditions. At the same time, this paper adopted the chaotic particle swarm optimization algorithm based on logic from the map to solve the model. Finally, the paper proved the accuracy and effectiveness of the model and algorithm by an example.

Abstract: A large amount of hydrogen would be generated because of zirconium-water reaction during serious accidents in nuclear power plant (NPP). Hydrogen could be combusted or explode under certain conditions, resulting in damage of the containment integrity and releasing radioactive substances into surrounding environment. Therefore, hydrogen elimination inside the NPP containment is an important subject. According to the requirements of NNSA (National Nuclear Security Administration), enough passive hydrogen recombiners (PHR) had been installed in unit 3&4 of Qinshan phase II NPP to prevent the hydrogen explosion in a serious accident. Additionally, new PHRs for unit 1&2 were also added. This article introduces the practical experience for the PHR modification, the comparisons between unit 1&2 and unit 3&4.

Abstract: With the development of TCE exploitation technology, it is necessary to carry out the research on assessment standards of TCE. First of all, this article discoursed the necessity about assessment standards of TCE. Furthermore, it introduced and compared the assessment methods of TCE .Finally, it gives the assessment standard of TCE resource of China.

Abstract: This study analyze the actual operation performance and energy efficiency of thirty-nine ground source heat pump (GSHP) systems based on site tests in Wuhan, China. These systems include ground couple heat pump (GCHP) systems, ground water heat pump (GWHP) systems and hybrid ground source heat pump (HGSHP) systems. The results show that energy-saving rates reach 30% for most of the systems using method recommended by Assessment Guideline. The coefficient of performance (COP) of the systems varies as follow: 2.6-4.85 for GCHP systems; 2.58-3.74 for GWHP systems; 2.66-5.67 for combined heat pump systems. According to the test results and system design data, analyses the factors affecting the system performance of three types of ground source heat pump systems.

Abstract: This paper presented a novel method for using Genetic Algorithm (GA) to solve the problem of Feed-water Enthalpy Rise Optimum Distribution in nuclear power unit. According to the characteristics of the pressurized-water reactor unit's secondary circuit, the calculation equations for the power and the heat rate of steam turbine are given in matrix form, the rate of extraction steam is calculated by the general matrix thermal balance equation, and then receive the equation of the efficiency of steam turbine which has relative with parameters of every node in the thermodynamic system in PWR unit. Taking the efficiency equation as aim function, an effective fitness-model was established with the appropriate optimum parameters under the restriction condition, the feed-water enthalpy rise distribution is optimized under the restriction condition by means of Genetic Algorithm. Through the calculation of a 600MW PWR nuclear power unit, the results indicate that Genetic Algorithm has global searching performance, gives a better global optimum than original design value rapidly and shows the relations between the optimum parameters (even the temp parameters) and the optimization easily. Genetic Algorithm is a promising method for analyzed and solved the feed-water enthalpy rise optimum distribution in PWR nuclear power unit.

Abstract: Removed due to intellectual right issues.

Abstract: Jinma company of Liaohe oilfield has carried out weak gel flooding in-depth in block Hai1 and achieved good effect. But in the process of profile and flooding, problems of gelation fluctuating and gelling rate declining seriously affected the implementation effect of the profile control and flooding project. It is researched that one of main factors affecting gelling effect of profile and flooding system is the dissolved oxygen. Aiming at this problem, this paper studies critical value affecting gelling in combination with the actual situation of polymer displacement in block Hai 1. The experimental results show that, content of dissolved oxygen affects both gelling strength and gelling time of weak gel in the way that when dissolved oxygen content is between 0mg/L and 3mg/L, low gelling strength and long gelling time are obtained, while in the range of 4mg/L-10mg/L, gelling effect is good. Two critical values are respective 1.5mg/L and 7mg/L.

Abstract: The catalytic effects of Zn on the release of the gaseous products during pyrolysis of Shenhua lignite was investigated by using a fixed-bed quartz reactor. The product gas compositions from the coal pyrolysis were analyzed by a gas chromatography (GC). Experimental results show that Zn had noticeable catalytic effects on lignite pyrolysis. With the increase in Zn content, lignite weight loss increases during pyrolysis. However, there was an optimum content for amount Zn into the coal. Pyrolysis temperature had a great impact on the composition of pyrolysis gas. As the pyrolysis temperature increased, char yield decreased and gas yield increased. There existed a temperature that tar yield reached its maximum value.