Maximum power point fuzzy prediction control method for uncertain photovoltaic system

A technology of maximum power point and uncertainty, applied in photovoltaic power generation, control/regulation systems, instruments, etc., can solve the problem of lack of strict convergence analysis of MPPT method

Inactive Publication Date: 2019-01-04
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0004] Aiming at the deficiency of the above-mentioned background technology, the present invention provides a fuzzy maximum power point predictive control method for photovoltaic systems with uncertainty, which solves the technical problem that the traditional MPPT method lacks strict convergence analysis and only provides approximate maximum power, and can Guarantee that the photovoltaic system reaches the maximum power point within a limited time

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  • Maximum power point fuzzy prediction control method for uncertain photovoltaic system
  • Maximum power point fuzzy prediction control method for uncertain photovoltaic system
  • Maximum power point fuzzy prediction control method for uncertain photovoltaic system

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Embodiment Construction

[0098] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0099] A method for fuzzy predictive control of maximum power point of an uncertain photovoltaic system, characterized in that: comprising the following steps:

[0100] Step 1, establishing a dynamic model of the solar photovoltaic array system.

[0101]Starting from engineering reality, ignoring the shunt and series resistance inside the solar photovoltaic system model, the output current expression is:

[0102]

[0103] Among them, v pv and i pv respectively represent the output voltage and output current of the photovoltaic array; γ=q / (n s φKT), charge q=1.6×10 -19 C, Boltzmann constant K=1.3805×10 -23 J / K, T represents the temperature of the battery, n p and n s respectively represent the number of parallel and series units, the ideal p-n junction characteristic factor φ=1-5, I ph Indicates the photogenerated current, ...

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Abstract

A maximum power point fuzzy prediction control method for an uncertain photovoltaic system comprises the following steps: firstly, introducing MPV and DMP fuzzy control configurations with PV voltageand power slope as control outputs; secondly, using a T-S fuzzy model representation method to represent the two fuzzy MPPT control configurations as output adjustment problems in a unified form; then, for the deviation of a DC / DC converter, proposing a predictive PDC control law based on an integral fuzzy observer to directly drive the system to reach the maximum power point. The proposed fuzzy prediction controller can ensure that the photovoltaic system reaches the maximum power point within a limited time. The maximum power point fuzzy prediction control method for an uncertain photovoltaic system can solve the controller and the observer gain online by the newly developed LMI type control algorithm with no need to perform coordinate transformation and calculation on the maximum powerpoint of the converter, and compared to the conventional MPPT method, allows for strict stability analysis and online control design of the system in the event of rapid atmospheric changes.

Description

technical field [0001] The invention belongs to the technical field of electric power system automation, and in particular relates to a fuzzy prediction control method for a maximum power point of a photovoltaic system with uncertainty. Background technique [0002] With the increasing problem of global warming and the continuous reduction of traditional fossil fuel energy, renewable energy (solar energy, wind energy, geothermal energy, etc.) has attracted more and more attention and has become an alternative energy source. Given that renewable energy has the advantages of direct power, easy maintenance, and no noise, solar photovoltaic (PV) energy is widely used in many fields of production and life. Due to the high installation cost of photovoltaic arrays, Maximum Power Point Control (MPPC for short) has become an important control issue for photovoltaic systems. Traditional MPPC control methods include: perturbation and observation method, incremental conductance method,...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/67
CPCG05F1/67Y02E10/56
Inventor 解相朋刘亚楠胡松林岳东
Owner NANJING UNIV OF POSTS & TELECOMM
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