Advanced Materials Research Vols. 953-954

Abstract: With the use of representative observed wind speed data for a whole year in Jiuquan field in Gansu province of Hexi Corridor ,we analysed the characteristics of ten-minutes wind speed, diurnal wind speed, monthly wind speed variation , as well as the influence of the wind power change rate in different time periods and diurnal variation in four seasons. Studies have shown that ten-minutes short-term wind turbulence characteristics was more obvious, with some randomness , but mainly exhibited typical diurnal characteristics of variation. In addition to mean state of wind conditions, there were sustained gale, short-term gale, continued small wind, regular small wind appeared. Monthly variation of wind speed is characterized by the "three peaks and three valleys" , showing the regular change that wind speed was larger in spring and summer , and it was smaller in autumn and winter. Daily fluctuation of wind electricity generation in four seasons presented similar trends, it was a peak-valley feature, valley generally appeared between 9-11 a.m., the peak occurred between 5-7 p.m..Wind power got larger between 1 and 11 p.m., this period was the peak electricity needed, wind power added can significantly ease the power grid pressure and will has significant positive effect for the power grid control. Ten-minute power variation was relatively stable, with the time interval increased, variation in electricity generation of one day rate increased gradually.

Abstract: As wind power in China is developing more and more rapidly, the characteristics of wind power output such as randomness and volatility have brought great pressure to the system peak load regulation. On the basis of defining negative peak regulation ability, this paper gives out the calculation formula of negative peak regulation ability including wind power and the main factors of influencing the negative peak regulation ability are calculated. Aimed at the regional power grid in the target year 2014, this paper makes some analytical prediction on such main factors and calculates the negative peak regulation ability, and the amount of the acceptance of wind power bound by it, and makes some sensitivity analysis of the negative peak regulation ability and the amount of the acceptance of wind power.

Abstract: Due to the energy supply and demand imbalance and unreasonable energy consumption structure, China should vigorously develop renewable energy. Wind power is important choice. In the past decade, the China wind power industry has developed rapidly. By 2012, the total installed capacity of wind power in China is 75324.2MW. China has become the largest installer of wind power capacity in the world. However, the wind power in also facing many problems. In this paper, analyzes wind power industry’s internal and external environments to identify opportunities, threats, strengths and weaknesses. Finally, put forward an appropriate strategy to promote the healthy and orderly development of the wind power industry.

Abstract: The wind environment of a district is calculated and analyzed with numerical simulation by CFD software Fluent. It analyzed concretely the air flow pattern around buildings and velocity profile, in order to provide a theoretical basis for the utilization of buildings wind power.

Abstract: Utilization of the otherwise curtailed wind to produce heat is considered an effective solution to combating wind curtailment. This paper studies the economics of wind heating in facilitating wind power integration in China. The operation mode of wind-heating is presented. Factors that impact the economics of wind heating are identified. Economics of wind heating is then analyzed both mathematically and with a case study. Results show that wind-heating helps integrate more wind in the system, but the capital cost of heating station hardly makes the project economically viable. Reducing the capital cost of the project by subsidies can be a good solution for the problem.

Abstract: With the development of concentrated wind power areas, new energy’s dispatching problems are more prominent with its fast expansion. However, we can maximize the utilization of wind power under power curtailment conditions by optimal wind power dispatching. The paper studies on the basic theories of wind power turbines, and analyses the power’s control and output characteristics of wind turbine. By studying the unit commitment of wind turbines, this paper provides a strategy for optimal dispatch in wind power generation. The calculation results show that the total active and reactive power output of the wind farm match the request of dispatch center. And the total active loss and total reactive loss is the least in the meantime.

Abstract: This article carries out the selection and verification of the prediction method by learning from the EU’s data and development experience on the basis of the comparative and analytic research of the industry development in China and the EU, and puts forward the installed capacity prediction of wind power in the near and mid-term in China based on the model of DGM (2,1), in order to provide an reference for the orderly and healthy development for China’s wind power industry.

Abstract: In china, increasing large-scale wind power integration has brought much more peak load regulation demand, which is the bottleneck of the integration of wind power to systems. This paper analyzed the influence mechanism of large-scale wind power on peak load regulation demand. And critical indicators are constructed based on the daily peak-valley difference to evaluate peak load regulation demand caused by wind power integration. Statistical analyses based on large number of actual dates reflect the influence of large-scale wind power integration on peak load regulation demand, which can help provide more decision-making information for planning and operation.

Abstract: Large-scale wind turbine generators with power electronic converters that operate near series compensated transmission lines are susceptible to un-damped sub-synchronous oscillations. This sub-synchronous oscillation is called Sub-synchronous Control Interaction (SSCI). With the rapid development of wind power technology, SSCI emerges as a new sub-synchronous oscillation phenomenon. The first SSCI event occurred for a wind farm in America in2009, which resulted in damage to the wind turbines. The origin of SSCI is presented and its characteristics of different types of wind turbines are summarized. Then the research prospect on this field is explored.

Abstract: As different wind power forecasting methods provide different information and differ in forecast precision, the combined wind power forecasting model is employed to better forecast wind power. Wind power combination forecasting model based on drift and complementarity of different single wind power forecasting models is proposed in this paper. The combination forecasting model provides a new solution to wind power forecast. Finally a practical example is given to show that wind power combination forecasting model based on drift can improve forecasting precision and is effective in practice.