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Method for tracking maximum power point of photovoltaic power generation system under local shadow

A technology of photovoltaic power generation system and maximum power point, which is applied in photovoltaic power generation, control/regulation system, and electric variable adjustment. small effect

Inactive Publication Date: 2014-04-02
XUZHOU COLLEGE OF INDAL TECH
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Problems solved by technology

However, the perturb-and-observe method also has its inherent disadvantages, that is, there are unavoidable oscillations near the maximum power point resulting in additional power loss, and the perturb-and-observe method can produce misjudgment

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  • Method for tracking maximum power point of photovoltaic power generation system under local shadow
  • Method for tracking maximum power point of photovoltaic power generation system under local shadow
  • Method for tracking maximum power point of photovoltaic power generation system under local shadow

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Embodiment Construction

[0014] like figure 1 As shown, since the output characteristics of the photovoltaic array are nonlinear under the influence of partial shading, the control strategy of the nonlinear system can be used to realize MPPT control. Since the sliding mode variable structure control can make the control system slide according to the preset switch surface, the nonlinear control system is basically not affected by parameter changes, and has good robustness. However, because the sliding mode variable structure control has high-frequency jitter near the sliding mode surface, and the switching frequency of the sliding mode variable structure control is uncertain, it is difficult to design the follow-up filter. Therefore, the present invention adopts "sliding mode variable structure control + immune PID controller" as a maximum power point tracking method for photovoltaic power generation systems, where the immune PID controller controls system jitter.

[0015] The maximum power point trac...

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Abstract

The invention discloses a method for tracking a maximum power point of a photovoltaic power generation system under the local shadow and relates to the technical field of automatic control. The method includes first setting a switching value on each side of a switching face for the detected output voltage Upv and output current Ipv of a photovoltaic array; judging the state by calculating a slip form switching function S according to a P-V characteristic curve of a solar battery, wherein m is a constant coefficient, is immediate power output by a photovoltaic battery and is the maximum power output by the photovoltaic battery under the standard state. The system enters slip form control when the switching face is switched to one value, and the system enters immune PID control when the switching face is switched to the other value. The method has the advantages of well achieving tracking control of the solar energy maximum power point when the solar battery is shielded, effectively improving system tracking speed and output efficiency and improving electric energy quality due to the fact that the output curve is smooth, and output vibration is reduced.

Description

technical field [0001] The invention relates to the technical field of maximum power point tracking of a photovoltaic power generation system, in particular to a maximum power point tracking method of a photovoltaic power generation system under partial shadow. Background technique [0002] With the development of society, energy and environmental issues are becoming more and more prominent, solar energy has a good application prospect as a renewable energy. However, the photoelectric conversion efficiency of photovoltaic cells is low, and the output power has a great relationship with the intensity of sunlight and the ambient temperature, which has obvious nonlinearity. It is necessary to connect a maximum power point tracking (MPPT) circuit between the photovoltaic device and the load. Give full play to the efficacy of photovoltaic cells. At present, the commonly used MPPT control algorithms include constant voltage tracking control method, perturbation and observation me...

Claims

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Application Information

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IPC IPC(8): G05F1/67
CPCY02E10/58Y02E10/56
Inventor 周天沛孙伟
Owner XUZHOU COLLEGE OF INDAL TECH
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