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Maximum power point fuzzy tracking control method with uncertain photovoltaic system

A maximum power point, photovoltaic system technology, applied in photovoltaic power generation, control/regulation systems, instruments, etc.

Inactive Publication Date: 2019-02-19
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

However, the existing control theory methods based on the T-S fuzzy model have not been directly and successfully applied to the actual photovoltaic power generation system. The main reason is that there are uncertainties in the actual photovoltaic system, and the system model has time-varying characteristics, so the maximum power point of the photovoltaic system is also time-varying. There is an urgent need to study the fuzzy maximum power point tracking control method for photovoltaic systems with uncertainties

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  • Maximum power point fuzzy tracking control method with uncertain photovoltaic system
  • Maximum power point fuzzy tracking control method with uncertain photovoltaic system
  • Maximum power point fuzzy tracking control method with uncertain photovoltaic system

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Embodiment Construction

[0100] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings of the specification.

[0101] A fuzzy tracking control method for the maximum power point of an uncertain photovoltaic system includes the following steps:

[0102] Step 1: Establish a dynamic model of the solar photovoltaic array system.

[0103] The specific steps for establishing the dynamic model of the solar photovoltaic array system are:

[0104] According to the solar photovoltaic circuit, the current expression is listed as follows:

[0105]

[0106] Where V pv And i pv Represents the output voltage and output current of the photovoltaic array, n p And n s Indicates the number of parallel and series units, γ=q / (n s φKT) and charge q=1.6×10 -19 C, Boltzmann's constant K=1.3805×10 -23 J / K, T represents the temperature of the battery, φ=1-5, I ph Represents the photocurrent, I rs Represents the reverse saturation current. According to the ...

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Abstract

The invention provides a maximum power point fuzzy tracking control method with an uncertain photovoltaic system. According to the maximum power point fuzzy tracking control method with an uncertain photovoltaic system, the bias problem of DC / DC converter can be solved by proposing an extended PDC based on integral fuzzy observer, and the system can be driven directly to reach a maximum power point; the proposed controller and observer of fuzzy tracking control method can fuse more system information because of more complex construction forms, a control design feasible solution with significantly reduced conservatism can be obtained by using a developed relaxed LMI design method through the gain of the controller and the observer, thus facilitating the online implementation of a fuzzy tracking control scheme; the photovoltaic power generation system to which the method is directed can have any type of parameter uncertainty, which can solve the technical problem that the prior maximum power point tracking method lacks a strict convergence analysis and provides only approximate maximum power.

Description

Technical field [0001] The invention belongs to the technical field of power system automation, and specifically relates to a fuzzy tracking control method of the maximum power point of an uncertain photovoltaic system. Background technique [0002] With the increasing environmental problems of global warming, traditional fossil fuel energy is gradually decreasing, and renewable energy sources (solar, wind, and geothermal energy, etc.) are receiving more and more attention as alternative energy sources. Among renewable energy sources, solar photovoltaic energy is widely used in many applications due to its direct power form, easy maintenance, and no noise. Because of the high installation cost of photovoltaic arrays, maximum power point tracking control (MPPT) has become an important issue for photovoltaic systems. Traditional MPPT control methods include disturbance and observation method, incremental conductance method, fuzzy logic method, and maximum power voltage (MPV)-based...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/67
CPCG05F1/67Y02E10/56
Inventor 解相朋周平平胡松林岳东
Owner NANJING UNIV OF POSTS & TELECOMM
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