基于频域的风电场功率波动仿真 (二)变换算法及简化技术  

Simulation of Power Fluctuation of Wind Farms Based on Frequency Domain: Part two Transformation Algorithm and Model Simplification

作　　者：林今[1] 孙元章[1] P.SORENSEN 李国杰[1] 程林[1] 黎雄[1] 

机构地区：[1]电力系统国家重点实验室,清华大学电机系,北京市100084 [2]Wind Energy Division at Riso DTU,Technical University of Denmark,Roskilde 4000,Denmark

出　　处：《电力系统自动化》2011年第5期71-76,共6页Automation of Electric Power Systems

基　　金：国家自然科学基金资助项目(50977050,50823001)~~

摘　　要：基于频域的风电功率波动模型物理意义更为清晰,能够更为准确地描述风电功率的波动特性。然而,该模型的仿真计算涉及到更为复杂、含功率谱密度函数的时频转换问题。同时,该模型的计算复杂度较高,计算资源占用过多。为了解决以上问题,首先从基础概念出发,分析了功率谱密度函数的物理意义及其与传统频域模型的区别,并详细推导了该模型的时频转换算法,使其能够在计算机上被快速实现。然后提出了区域内风机分布式接入和集中式接入2种频域模型的简化方法,它们均能根据实际工程情况大幅度加快模型仿真速度。仿真结果验证了以上方法的实用性和有效性。The wind power fluctuation model built up in the frequency domain is mathematically equivalent with that in the time domain,and has a clearer physical meaning therefore describes the fluctuation more accurately.However,the simulation of this model is required to deal with the time-frequency transformation related to the power spectrum density（PSD）,which is more special and complicated than normal transformations.Meanwhile,the computational complexity also increases significantly,more computation resources are needed.These problems negatively affect the engineering application of the model.To overcome these disadvantages,the physical meaning of PSD based on fundamental concepts is presented,so that the specialties of this model compared with conventional ones can be understood.Then the time-frequency transformation algorithm is derived,which is fast to be implemented in digital computers.Two model simplification approaches are proposed subsequently,both of which can tremendously accelerate the simulation for either embedded integration or concentrated integration scenarios.The numerical simulation results finally validate the feasibility and efficiency of this model.

关 键 词：功率波动 频域模型 时频转换 功率谱密度函数 快速傅里叶变换 模型简化 风力发电 

分 类 号：TM614[电气工程—电力系统及自动化] TM743