Improved Maximum Power Point Tracking Control of Power Signal Feedback Method for Permanent Magnet Synchronous Generator Considering Loss

doi:10.11930/j.issn.1004-9649.202307008

Abstract

Abstract:

In the maximum power point tracking (MPPT) control of the traditional power signal feedback (PSF) method for the direct-driven permanent magnet synchronous generator (PMSG), it is necessary to obtain the power-speed curve of wind turbines in advance, and wind energy conversion efficiency of the turbines will change with time, thereby reducing the control accuracy of PSF method. Based on the traditional PSF method, this paper proposes an improved MPPT control strategy for PMSG considering internal loss. This strategy tracks the maximum power points of wind turbines through the hill climb searching method and then accurately calculates the proportion coefficient required by the PSF method and the reference power to track the maximum wind power. Both the simulation and experiments verify the effectiveness and feasibility of the proposed control strategy.

Key words: wind energy conversion system, permanent magnet synchronous generator, maximum power point tracking, power signal feedback method, hill climb searching

Yunpeng CHENG, Jianhua LI, Shouguo CAI, Xuebo ZHANG, Yong WANG, Ye LU, Ying ZHU. Improved Maximum Power Point Tracking Control of Power Signal Feedback Method for Permanent Magnet Synchronous Generator Considering Loss[J]. Electric Power, 2023, 56(10): 62-70.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202307008

https://www.electricpower.com.cn/EN/Y2023/V56/I10/62

Figures/Tables 13

Fig.1 Pw–ωm curve

Fig.2 Flow chart of improved MPPT method of PSF

Table 1 Simulation parameters of wind power generation system

风力机参数	数值	永磁同步电机参数	数值
风轮半径/m	38.8	定子电阻/Ω	0.001
转动惯量/(kg·m²)	16000	永磁磁链/Wb	10
切入/切出风速/(m·s^–1)	3/25	极对数	40
额定风速/(m·s^–1)	12	d-q轴电感/H	0.0015
最佳叶尖速比	8.1	额定功率/MW	2.5
最大风能转换率	0.48	额定角速度/(rad·s^–1)	2.495
空气密度/(kg·m^–3)	1.225	铁耗模拟电阻/Ω	25

Fig.3 Simulated waveform of wind speed

Fig.4 Simulated waveform of HCS with fixed step

Fig.5 Proportion coefficient under HCS with changed step

Fig.6 Simulated waveform of improved PSF control

Fig.7 Experimental platform of PMSG

Table 2 Parameters of experimental PMSG

永磁同步电机参数		数值
定子电阻/Ω		2
d-q轴电感/H		0.008
永磁磁链/Wb		0.25
极对数		4
额定功率/kW		3
额定转速/(r·min^–1)		750

Fig.8 Experimental waveform of wind speed

Fig.9 Experimental waveform of PSF control

Fig.10 Experimental waveform of TSR control

Fig.11 Experimental waveform of improved PSF control

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