Advanced Materials Research Vols. 1070-1072

Abstract: Using the C - C method to reconstruct the phase space of wind power time series, get the maximum wind power time series Lyapunov exponent, confirmed that the wind power time series have chaotic characteristics. Followed by the radial basis function (RBF) neural network model for wind power chaotic local multi-step prediction, results show that the prediction effect is better than that of the predicted effect of 48 hours for 24 hours.

Abstract: For the rotor speed of variable speed wind turbine (VSWT) is decoupled from system frequency, the system equivalent rotary inertia and primary frequency control ability are decreased with wind power penetration growing continuously. To solve the problems, VSWT with additional frequency control was studied. The dynamic characteristics of input and output power of VSWT during participating in system frequency regulation are analyzed. The relationships between the active power increments and the duration of VSWT participating frequency control are quantified. A coordination frequency control strategy base on time sequence control is proposed. According to the control strategy, the VSWTs can participate in frequency regulation depending on the coordination of wind speed, power increments and duration. The simulation results demonstrate the effectiveness of the proposed control strategy, which can make full use of the frequency regulation ability of VSWTs as well as minimize the negative effects on system frequency.

Abstract: A control strategy for the wind power smoothing is proposed based on the analysis of the wind power energy capture. In the proposed method, the power reference command of double-fed induction generator is adjusted by using a factor, which can be determined by the system operator according to the system spinning reserve requirements. The power reference command is used to control the wind power generator speed and the pitch angle of the wind turbine. The newly proposed strategy has some advantages compared with the proposed methods in literatures. Simulation test for a wind farm with 6×1.5MW DFIG verifies the proposed wind power fluctuation smoothing strategy.

Abstract: A method of risk assessment considering weather impacts was proposed for power system with wind power. Firstly, the mechanism of the weather affecting the risk of power system is analyzed, and then the component reliability model based on weather was illustrated. The transmission line model takes into account of the situation that the line may pass through a variety of climatic zones. Secondly, combine the above-mentioned model with the existing risk assessment methods, a new method was obtained. By using of the modified IEEE-RTS79 system with wind power, the feasibility and reasonableness of the proposed model and approach are verified. The results show that it is necessary to consider weather especially when the system is integrated with large-scale wind power or the system passes through zones with particularly higher probability of bad weather. Compared with the existing risk assessment methods, the proposed method is more in line with the actual system, and the assessment results are more reasonable.

Abstract: As wind power integration is scaled up year by year, the problem of abandoned wind electricity has become increasingly severe, and thus caused serious waste of energy. To solve the problem of abandoned wind electricity, this paper tries to heat power plant’s back water in electric boiler to absorb abandoned wind electricity. Taking a thermal power plant for example, the application of electric boiler in backwater system can bring great economic benefits and environmental benefits, and provide a reasonable way and solution for the use of abandoned wind electricity.

Abstract: The energy efficiencies of two kinds of ground-source heat pump systems (GSHPs) are evaluated in this study based on field data. The two kinds of GSHPs are a ground-coupled heat pump system (GCHPs) and a groundwater heat pump system (GWHPs) which were installed in two apartment buildings of wuhan, respectively. We monitored various operating parameters, including the outdoor temperature, the flow rate, the electrical consumption and the water temperature. The values of coefficient of performance (COP) of system and chiller were evaluated based on a series of measurements. The seasonal COP of the chillers of the GCHPs and the GSHPs were 4.45 and 3.94 in the cooling season, 5.07 and 3.69 in the heating season. The comparison of COP implies that the GWHPs is more efficient than the GCHPs due to its steady water temperature of ground source heat exchanger.

Abstract: Nuclear energy as a clean energy, with the gradual depletion of traditional energy, is particularly important. In this paper, the status of the application of nuclear technology was reviewed. And problems during the use of nuclear energy were addressed, including environmental issue generated by radioactive mineral extraction, radwaste disposal, nuclear power plant safety operation. Although, there are still some problems in the process of nuclear energy use, undeniably nuclear energy is still the hope for the future of human society. Therefore, the technical and management improvement can achieve sustainable development of nuclear energy, in order to ensure the safety of human energy use and sustainability.

Abstract: A travelling wave reactor (TWR) is an advanced nuclear reactor which is capable of running for decades given only depleted uranium fuel, it is considered one of the most promising solutions for nonproliferation. A preliminary core design was proposed in this paper. The calculation was performed by Monte Carlo method. The burning mechanism of the reactor core design was studied. Optimization on the ignition zone was performed to reduce the amount of enriched uranium initially deployed. The results showed that the preliminary core design was feasible. The optimization analysis showed that the amount of enriched uranium could be reduced under rational design.

Abstract: The development of China's nuclear power industry is very rapid in recent years, nuclear generator also gets great development. With the increase of generator unit capacity, The service life and reliability of the generator is improved too. Among them, transient thermal generator operation ability is one of the key factors that affects the service life and reliability of generator. This paper mainly carries on to the generator produces in asymmetric operation process of negative sequence current and transient negative sequence component analysis theory, and with a turbo generator as an example, the voltage and current in different running states of the generator and the air gap flux density were compared and analyzed with finite element method. The conclusion of this paper has reference significance to deeply research the future of generator negative sequence component.

Abstract: Power demand of China grows strongly in few decades. Developing nuclear power industry is not only a strategic measure to meet electrical energy demand, but also an inevitable choice to achieve energy conservation and promote green low-carbon development. Innovation Ecosystem theory provides new perspectives and ideas for studying on the sustainable development of nuclear power industry. In this paper, we consider the sustainable development of nuclear power industry would achieve in the Innovation Ecosystem. The characteristic of the nuclear power industry determines that construction and development of nuclear power industry will involve lots of vendors and enterprises, and require all vendors and enterprises that involved make collaborative effort, around the end-user (nuclear power plant) for the design, production and manufacturing, realize win-win finally. Common development and co-evolution of all participants in the nuclear ecosystem is the premise and guarantee of nuclear power industry’s sustainable development.