不同定向约束下直驱永磁同步风电机组多稳态解探讨  

Multiple Steady-state Solutions of PMSG Under Different Orientation Constraints

作　　者：李生虎[1] 朱婷涵[1] 华玉婷[1] 

机构地区：[1]合肥工业大学电气与自动化工程学院,安徽省合肥市230009

出　　处：《电力系统自动化》2014年第19期28-32,73,共6页Automation of Electric Power Systems

基　　金：国家自然科学基金资助项目(51277049)~~

摘　　要：针对直驱永磁同步发电机(PMSG)机侧变流器无功功率未知时,PMSG稳态约束为不定方程组,需要补充边界条件才能得到唯一解的问题,文中建立了基于定子电流或定子电压定向约束的稳态求解算法。发现由于定向约束不能反映机侧无功平衡,两种定向下计算结果不一致。进一步考虑有功调度,在两种定向约束下分别采用转速调节或桨距角调节,建立PMSG稳态解算法。计算结果证实:定子电流定向时发电机有功损耗更小,机电能量转换效率更高,但是吸收无功功率更多;随风速增加,吸收无功功率增加,定子电流定向时发电机能量转换效率下降,定子电压定向时效率增加;转速偏离最优转速或增加桨距角,都可实现对PMSG的有功调度,但机电能量转换效率不同,采用桨距角调节时,收敛速度快于转速调节。In view of the need of a boundary condition to obtain the unique solution for the steady-state constraints of permanent magnet synchronous generators （PMSGs） that are a set of indeterminate equations with the reactive power output of the machine-side converter unfixed,steady-state solutions based on the stator current/voltage orientations are proposed.Because of inconsistency with the reactive power balance of the machine-side-converter,the solutions under two orientations are different. Further consideration of the power dispatch by adj usting the rotor speed or the pitch angle,steady-state solutions to PMSG are proposed.The numerical results show that：（1） the stator current orientation yields less active loss and higher efficiency,but absorbs more reactive power;（2）with increased wind speed,the PMSG absorbs more reactive power,the efficiency decreases with stator current orientation,but increases with stator voltage orientation;（3） active power dispatch may be realized by changing the rotor speed or the pitch angle,while the efficiency is different,and adj usting the pitch angle yields better convergence than adj usting the rotor speed.

关 键 词：直驱永磁同步发电机 稳态解 多解 定子电流定向 定子电压定向 有功调度 

分 类 号：TM614[电气工程—电力系统及自动化]