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Photovoltaic system maximum power point tracking method based on nonsingular fast terminal sliding mode control

A technology of maximum power point and photovoltaic system, applied in the direction of control/regulation system, photovoltaic power generation, instrument, etc., can solve problems such as convergence speed of singular phenomena

Active Publication Date: 2021-09-07
ANHUI UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

[0009] For the sliding mode control method used in the maximum power point tracking of photovoltaic systems, there will be problems such as inability to converge within a limited time, singular phenomena and slow convergence speed

Method used

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  • Photovoltaic system maximum power point tracking method based on nonsingular fast terminal sliding mode control
  • Photovoltaic system maximum power point tracking method based on nonsingular fast terminal sliding mode control
  • Photovoltaic system maximum power point tracking method based on nonsingular fast terminal sliding mode control

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Embodiment 1

[0033] combine Figure 1-Figure 6 , a method for tracking the maximum power point of a photovoltaic system based on non-singular fast terminal sliding mode control in this embodiment, which designs a new control system on the basis of the equivalent circuit of the Boos converter in the photovoltaic system, and the system adopts a double-loop control strategy, That is, search loop control and tracking loop control. The search loop control adopts the perturbation and observation method (P&O) to search the maximum power point (MPP), and the tracking loop control adopts the control method proposed by the present invention to track the maximum power point. The specific steps are:

[0034] Step 1. Establish the mathematical model of the Boost converter in the photovoltaic system to obtain the state variables of the photovoltaic system:

[0035] In this embodiment, the photovoltaic cell model is equivalent to a voltage-controlled current source, so a precapacitor C is connected to ...

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Abstract

The invention discloses a photovoltaic system maximum power point tracking method based on nonsingular fast terminal sliding mode control, and belongs to the technical field of photovoltaic power generation. The method comprises the following steps: firstly, establishing a mathematical model of a Boost converter in a photovoltaic system, and obtaining a state variable of the photovoltaic system; searching a voltage corresponding to the maximum power point through a perturbation observation algorithm, and taking the voltage as a reference voltage; calculating a tracking error e1 between the photovoltaic output voltage and the reference voltage, and deriving the tracking error e1 to obtain an auxiliary tracking error e2; designing a novel non-singular fast terminal sliding mode surface, and combining an equivalent control law and an index reaching law to obtain a switch control quantity; and finally, carrying out stability analyzing on the controller. According to the method, improvement is made on the basis of a traditional sliding mode surface, the singular problem of a terminal sliding mode is avoided, global rapid convergence of the system can be achieved, and therefore the system has good dynamic performance and stability and high robustness.

Description

technical field [0001] The invention relates to the technical field of photovoltaic power generation, and more specifically relates to a method for tracking the maximum power point of a photovoltaic system based on non-singular fast terminal sliding mode control. Background technique [0002] Energy is an indispensable driving force in the historical development of human beings. With the rapid development of the economy, the shortage of traditional energy has led to more people's attention to renewable energy. As an important and clean renewable energy, the proportion of photovoltaic power generation in the power grid is increasing day by day. Photovoltaic power generation is based on the principle of photovoltaic effect, using solar cells to directly convert sunlight energy into electrical energy. The power of photovoltaic power generation is particularly dependent on the current environment, and its output characteristics are largely limited by the intensity of light and ...

Claims

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Application Information

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IPC IPC(8): G05F1/67
CPCG05F1/67Y02E10/56
Inventor 郑诗程兰向龙郎佳红张为民方四安徐磊
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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