不同定向约束下直驱永磁同步风电机组多稳态解探讨

发布时间：2018-02-19 17:48

本文关键词： 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　出处：《电力系统自动化》2014年19期 　论文类型：期刊论文

【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。
[Abstract]:In order to solve the problem that the steady-state constraint of PMSG is indeterminate equations when the reactive power of PMSG converter is unknown, it is necessary to supplement the boundary conditions to obtain the unique solution. In this paper, a steady-state solution algorithm based on stator current or stator voltage oriented constraint is established. It is found that due to the directional constraint can not reflect the machine side reactive power balance, the calculation results under the two orientations are inconsistent, and the active power scheduling is further considered. The PMSG steady-state solution algorithm is established by using rotational speed adjustment or pitch angle adjustment under two directional constraints respectively. The calculation results show that the generator has less active power loss and higher electromechanical energy conversion efficiency when stator current orientation is directed. With the increase of wind speed, the energy conversion efficiency of the generator decreases and the efficiency increases when the stator voltage is oriented, and the rotor speed deviates from the optimal speed or increases the pitch angle. The active power scheduling of PMSG can be realized, but the conversion efficiency of electromechanical energy is different. When the pitch angle is adjusted, the speed of convergence is faster than that of rotational speed.
【作者单位】：合肥工业大学电气与自动化工程学院;
【基金】：国家自然科学基金资助项目(51277049)~~
【分类号】：TM614

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