Applied Mechanics and Materials Vols. 291-294

Abstract: The paper introduces several methods about controlling strategies of DFIG to the gird turbulence. They could reduce the torque pulsation. They have better dynamic adjustment performance than the positive, negative sequence dual current control strategy. Stator current THD is well controlled. The experimental results show that it can smooth the DFIG active power output comparing with the traditional maximum wind energy tracking control strategy, significantly reduces the speed fluctuation of synchronous generator. The dynamic performance is improved.

Abstract: The safe operation of canned motor in nuclear primary pump is very important for nuclear power station. Taken a 5500KW large canned motor of nuclear primary pump as an example, physical model of three dimensional fluid and temperature coupled field was established. The motor temperature distribution under nominal working condition was calculated by using finite volume method. By calculation, revealing the temperature distribution regularity of stator strands, rotor bars, stator core and rotor core, which have significant reference value to structure design of canned motor.

Abstract: Too much worry on the safety of nuclear power has made many people take a negative attitude to the development of nuclear power. Nuclear safety experts pointed out that the nuclear fear of people is often due to little knowledge on the nuclear power. The paper analyses comprehensively the advantages of nuclear power, the safety of nuclear power, the reasons of nuclear power accident and its implications. Basised on these, development prospects of nuclear power is discussed.

Abstract: In recent years, like many people from other countries, the Chinese people pay close attention to nation’s development and policy of nuclear power, especially after the Fukushima incident. Furthermore, the concerns become exacerbated with the discussion about building the inland nuclear power plant. At the same time, the enthusiasm of the public participation which has its own characteristics has greatly improved in China. There is limited experience in the field of nuclear power decision-making in China. In this context, this paper comprehensive analyzes the Chinese public participation in decision-making of the nuclear power industry, summarizing the characteristics of public participation in this field. Then a typical case analysis with On-site visit and interview is made for verifying our theory. Based on these studies, some suggestions are put forward.

Abstract: To research the load-following capability of the nuclear power generating unit, this paper proposed a detailed mathematical model of the pressurized water reactor (PWR) which is suitable for medium- and long-term stability analysis of power systems. Analyzed the interactions between the nuclear power generating unit and the power system, through the simulations of a single machine infinite bus (SMIB) system. The results show that PWR nuclear power generating unit can meet load following requirements to some degree.

Abstract: After the Japan nuclear power crisis in 2011, main nuclear power countries and international organizations reactions to nuclear emergency and security problem had become a hot topic. The global concern on power emergency problem after the Japan Fukushima nuclear crisis was reviewed comprehensively. The International Atomic Energy Agency (IAEA) investigation, the U. S. NRC Security Check, EU stress test, and France ASN complementary safety assessment results were stated in detail. As an important source of power, China’s altitude toward the sustainable nuclear power development and safety was also surveyed. The main nuclear power countries all claimed their position to insist on the development of nuclear power while taking lessons from Japan Fukushima nuclear crisis. Finally some comments and suggestions to improve China’s power industry emergency response and drills system to support the sustainable development of nuclear energy were proposed.

Abstract: Since the Fukushima nuclear accident, social concerns on eco-friendly and safety are arising, urging changes in the nuclear and renewable policy, worldwide. This policy shift is accompanied by a change of generation mix and an increase in the cost of energy supply. So, analysis of generation expansion planning considering nuclear and renewable polish is essential.In this paper, we compare the impact of some nuclear and renewable policy to the national generation expansion planning based on 5th Power Expansion Planning. The results reveal that disposal of nuclear-power and construction of renewable instead of nuclear enhances the total energy supply cost.

Abstract: The mode experiment is respectively done under condition of different amount of gas supply, different shape of gas admission room, different cross-section shape of flow channel. Results show that pressure descend of U shape cross-section slot is smaller than the rectangle cross-section slot in the equal fault stream section situation, so flow distribution characteristic of U shape cross-section slot is better. The experiment results are consistent with numerical simulation results. In addition, numerical simulation results also indicate that the mass of gas diffusing from U shape cross-section slot to the diffusion layer is over greater, and U shape cross-section flow channel has a higher gas utilization ratio.

Abstract: Microfluidic fuel cell with flow-through porous electrodes is a new concept design which can significantly improve cell performance. In this paper, a three-dimensional numerical model which is based on mathematical formulations of laminar flow, species transport, and electrochemical reactions was developed to determine the effects of some important physical factors on cell performance. Moreover, this model also can be used to guide further optimization. The numerical simulation results obtained show that the cell performance is considered as functions of volumetric flow rate and porosity value. The peak power density increased almost linearly with the increase of flow rate when it less than 60µL min-1 .However, as the flow rate up to 60µL min-1, the cell performance becomes less sensitive to the increase of flow rate, and the corresponding maximum fuel utilization was achieved at the porosity value of 0.65.

Abstract: Molten carbonate fuel cell (MCFC) is achieving relatively high output and efficiency and reaching the level of commercialization compared to other fuel cells. Recently many studies are dealt with mobile applications of MCFC to use those superlative properties. But until now, researches are dealt with steady state energy analysis and life cycle assessment analysis. The practical dynamic feasibility analysis has not been done. Here we report, dynamic MCFC model and simultaneous mechanical balance of plant (MBOP) test algorithm can be used for evaluating feasibility of MCFC marine application. We modeled four 300 kW class MCFC stacks with a dynamic form in MATLAB/ SIMULINK package. Developed simulation bed can be used to deal with overall MCFC performance evaluation and various MBOP feasibility test.