基于等效功角同调的双馈风电场等值建模  

Equivalent Modeling of Doubly-Fed Wind Farm Based on Equivalent Power Angle Coherence

作　　者：朱林[1] 王贝 陈达[1] ZHU Lin;WANG Bei;CHEN Da(School of Electric Power,South China University of Technology,Guangzhou 510640,China)

机构地区：[1]华南理工大学电力学院,广州510640

出　　处：《南方电网技术》2018年第6期37-44,共8页Southern Power System Technology

基　　金：国家自然科学基金资助项目(51407079)~~

摘　　要：首先以双馈风机数学模型为基础,推导了双馈风机电磁功率的表达式,分析了影响双馈风机电磁功率的相关因素,说明了以等效功角作为双馈风机同调识别观察量的合理性,即等效功角可表征不同工况及控制方式下双馈风机的动态特性,并定义了基于等效功角的双馈风机同调判断准则。其次,根据双馈风机的外特性,提出了功率聚合算法,即以双馈风机输出有功功率为权重求取等值机的等效内电势并确定等值母线及等值机参数;该方法有效解决聚类分群的复杂性和局限性,并提出了适合同调双馈机群母线化简方法。最后以实际南方电网中某地区风电场为例的仿真验证了所提模型具有合理性,聚合精度较高。Firstly,based on the mathematical model of the double-fed induction generator(DFIG),the expression of the electromagnetic power of the DFIG is derived,and the related factors that affect the electromagnetic power of the DFIG are analyzed.The rationality of using the equivalent power angle as the observed variable for coordinate recognition and measurement of DFIG is proposed,that is,the equivalent power angle can characterize the dynamic characteristics of the DFIG under different operating conditions and control modes.And the criterion for the determination of the equivalent power angle of the homogeneity of DFIG is defined.Secondly,according to the external characteristics of the DFIG,a power aggregation algorithm is proposed,that is,the equivalent internal potential of the equalizer is obtained by using the active power output of the DFIG as the weight,and the equivalent bus and isoparameter parameters are obtained.It effectively solves the complexity and limitations of clustering and proposes a method for simplification of busbars for coherent doubly-fed clusters.Finally,the simulation of a wind farm in China Southern Power Grid is taken as an example to verify the rationality and the high aggregation accuracy of the proposed model.

关 键 词：双馈风机 等效功角 功率聚合算法 等效内电势 

分 类 号：TM614[电气工程—电力系统及自动化]