Photovoltaic MPPT Based on Improved Non-singular Terminal Sliding Mode Control

doi:10.11985/2022.02.018

Abstract

Abstract:

The output power of photovoltaic arrays fluctuates with environmental conditions and loads. To improve the efficiency of photovoltaic power generation systems, a MPPT method based on improved non-singular terminal sliding mode control is proposed. The method is applied to the standalone photovoltaic power generation system based on the Boost converter. Considering the slow response and significant steady-state chattering phenomenon of the traditional linear sliding mode photovoltaic MPPT control, an improved non-singular terminal sliding mode surface is designed to improve the steady-state accuracy of the system. It solves the singular problem of traditional terminal sliding mode control. On the premise of the fast response, the non-singular terminal sliding mode control law is simplified so that the complexity of the control system is reduced, and the stability of the system is verified. With the irradiation and temperature condition change, the simulation and experimental results show that compared with the traditional control method, the proposed method can quickly track the photovoltaic maximum power point with higher tracking accuracy and the system has strong robustness.

Key words: Photovoltaic power generation, maximum power point tracking, non-singular terminal sliding mode control

CLC Number:

TM615

HE Ning, XIAO Wenxun. Photovoltaic MPPT Based on Improved Non-singular Terminal Sliding Mode Control[J]. Journal of Electrical Engineering, 2022, 17(2): 160-167.

Figures/Tables 12

References 20

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参数	数值
最大功率P_m/W	1 102
开路电压U_oc/V	184
短路电流I_sc/A	8.15
最大功率点电压U_m/V	145
最大功率点电流I_m/A	7.6
电感L/mH	3.0
输入电容C₁/μF	500
输出电容C₂/μF	500

算法	P_avr/W	ΔP/W	t₁/s	t₂/s
电导增量法	1 104.7	22.7	0.15	0.10
线性滑模控制法	1 103.2	2.9	0.40	0.40
滑模+电导增量法	1 102.8	0.8	0.10	0.15
传统终端滑模控制法	1 101.6	-0.4	0.25	0.16
本文所提方法	1 102.6	0.6	0.08	0.06