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Zhang N.,Tsinghua University | Kang C.,Tsinghua University | Duan C.,Gansu Provincial Electricity Trading Center | Tang X.,Gansu Provincial Electricity Trading Center | And 4 more authors.
International Journal of Power and Energy Systems | Year: 2010

This paper presents a methodology to simulate the operation of multiple wind farms. The proposed model simulates the multiple wind farm output curves which fit the given statistical indices. Correlated wind speeds of different wind farms are generated by using stochastic differential equation which takes account of marginal distribution and time sequencing. Wind speed seasonal rhythms and diurnal patterns, turbine output characteristics, wind turbine reliability model and wake effect are considered in the model. The presented cases validate the effectiveness of the model and show that correlation among wind farms has significant influence on the stochastic behaviour of wind farm total output. The proposed model can be used to study the effects of large-scale wind power integration in power system.

Zhang N.,Tsinghua University | Zhou T.-R.,Tsinghua University | Duan C.-G.,Gansu Provincial Electricity Trading Center | Tang X.-J.,Gansu Provincial Electricity Trading Center | And 3 more authors.
Dianwang Jishu/Power System Technology | Year: 2010

At present large-scale wind farms are being constructed in China at a fast pace and they will be connected with power grids, it makes the peak load regulation of power grid becoming one of new puzzles in the operation of power grid containing wind farms. Considering the random nature of wind power output and complicated and changeable operation modes of wind farm, by means of simulating annual chronological load time series and chronological time series of wind power output in the planned year, the impacts of large-scale wind farm on power system peak load regulation are analyzed in a new viewpoint. The impacting mechanism of wind power output on difference between peak load and valley load of power grid is analyzed, by way of leading in a new evaluation index system the variation of peak-to-valley difference of equivalent load of power grid with large scale wind farm connected and its distribution are researched in detail. The influencing laws of large-scale wind farm on system peak load regulation under various outward power transmission modes and coordinative system peak load regulation modes are further analyzed. Selecting the wind farm base located in Jiuquan, Gansu province as the object, the wind power planning and the dispatching and operation of Gansu power grid are analyzed and demonstrated, and based on the analysis results some suggestions of generation expansion planning and operation mode for Gansu power grid are proposed.

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