基于背靠背变流器的风电系统仿真对比研究

doi:10.16180/j.cnki.issn1007-7820.2022.02.011

摘要/Abstract

摘要：

永磁直驱风电系统背靠背变流器的详细模型中含有多个电力电子器件,采用脉冲宽度调制技术会增加仿真系统的数学计算量。针对该问题,文中提出了一种均值模型去简化系统,使得风电系统能够快速且稳定地运行。对于变流器均值模型,在结构上利用受控电源代替变流器;在原理上忽略其高次谐波,仅保留基波成分。从系统控制的角度,去除PWM调制过程以改进系统的控制策略。最后,在MATLAB/Simulink中搭建永磁直驱风电系统仿真模型,对比了均值模型与详细模型的系统响应。仿真结果表明,均值模型不仅能满足系统精度要求,还能加快系统仿真速度,提升系统稳定性,证明了控制策略的合理性。

关键词: 永磁同步发电机, 背靠背变流器, 详细模型, 均值模型, 风力发电, 控制策略, MATLAB仿真, PWM

Abstract:

The detailed model of the back-to-back converter of the permanent magnet direct drive wind power system contains multiple power electronic devices, and the use of pulse width modulation technology will inevitably increase the mathematical calculation of the simulation system. In view of the problem, a mean value model is proposed to simplify the system so that the wind power system can operate quickly and stably. For the converter mean value model, the controlled power supply is used to replace the converter in structure, and its higher harmonics are ignored in principle, and only the fundamental wave component is retained. In addition, from the perspective of system control, the control strategy of the system is improved by removing the PWM modulation process. Finally, a permanent magnet direct drive wind power system simulation model is built in MATLAB/Simulink, and the system response of the mean model and the detailed model are compared. The simulation results show that the mean value model can not only meet the system accuracy requirements, but also speed up the system simulation speed, greatly improve the system stability, which verifies the rationality of the control strategy.

Key words: permanent magnet synchronous generator, back-to-back converter, detailed model, mean value model, wind power, control strategy, MATLAB simulation, PWM

中图分类号:

TP273

刘建龙,郝正航. 基于背靠背变流器的风电系统仿真对比研究[J]. 电子科技, 2022, 35(2): 67-73.

LIU Jianlong,HAO Zhenghang. Comparative Study of Wind Power System Simulation Based on Back-to-Back Converters[J]. Electronic Science and Technology, 2022, 35(2): 67-73.

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风力机参数	数值	PMSG参数	数值
额定功率/W	2.5×10⁵	额定功率/W	2.25×10⁵
输出功率/W	2.25×10⁵	额定频率/Hz	50
额定风速/m·s^-1	11	定子电阻/Ω	0.01
最大功率/pu	1	电枢电感/H	8.35×10^-4
最大转速/pu	1	转子磁链/Wb	9.727
桨距角/deg	0	磁极对数	48

模型	步长10 μs	步长50 μs	步长100 μs	步长250 μs
详细模型	574.95	163.98	-	-
均值模型	521.41	121.10	70.09	57.88