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Valley delimitation searching method for tracking multi-peak maximum power point of photovoltaic power system

A photovoltaic power generation system and maximum power point technology, applied in electrical digital data processing, special data processing applications, instruments, etc., can solve the problem of not being able to guarantee the search for the global maximum power point, etc., and achieve the effect of enhancing adaptability and improving control algorithms

Inactive Publication Date: 2012-06-13
HOHAI UNIV
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AI Technical Summary

Problems solved by technology

[0003] technical problem: In order to solve the problem that the original maximum power point tracking algorithm is only effective for single-peak P-V output characteristic curves, it cannot guarantee that the global maximum power point can be searched in the case of multiple peaks

Method used

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  • Valley delimitation searching method for tracking multi-peak maximum power point of photovoltaic power system
  • Valley delimitation searching method for tracking multi-peak maximum power point of photovoltaic power system
  • Valley delimitation searching method for tracking multi-peak maximum power point of photovoltaic power system

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Embodiment Construction

[0020] exist figure 1 In , the MPPT hardware structure diagram is given, which includes the following functional modules: photovoltaic array, main circuit DC / DC converter, storage battery or DC / AC inverter, voltage and current signal extraction module and main control module.

[0021] exist figure 2 In , the structural diagram of the photovoltaic system MPPT is given, including: photovoltaic array, DC / DC converter, DC / AC inverter, microcontroller and battery. After the sunlight is converted into electrical energy through the photovoltaic array, it can be connected to the grid by the inverter, and it can also charge the lead-acid battery. Various functions such as MPPT control, charge and discharge control, and drive are realized in the microcontroller. The MPPT control part can be realized by using the valley delimited search method, and this system is a specific application example.

[0022] exist image 3 In , the structure and related functions of the valley bounding s...

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Abstract

The invention discloses a valley delimitation searching method for tracking a multi-peak maximum power point of a photovoltaic power system. The valley delimitation searching method comprises the following steps of: for avoiding falling into a local maximum value during searching, partitioning a region after searching a valley by utilizing a valley delimitation method; for ensuring to obtain a global maximum value, performing sub-region search on a partitioned region and then determining region in which a maximum power point is located; finally, finding out a global maximum power point as a working point of a system by a variable-step-length searching method in the determined region. Through the algorithm design above, capability of responding complex environmental change of a practical photovoltaic power system can be strengthened, the shortage of a single-peak searching method is made up, and better maximum power tracking effect is reached.

Description

technical field [0001] The invention patent is a search method for solving the maximum power point tracking problem under multi-peak conditions in a photovoltaic power generation system, and belongs to the research field of optimal control and optimization methods. Background technique [0002] In the photovoltaic power generation system, in order to maximize the output power of the photovoltaic power generation system, it is necessary to track the maximum power point of the output power of the photovoltaic cell, that is, to keep the system working at the peak point of the power curve, and to convert solar energy into electrical energy with maximum efficiency. The currently used optimization algorithms are mainly aimed at the case where the output characteristic curve is "single peak", mainly including: constant voltage method, disturbance observation method, and admittance increment method. The common idea of ​​these maximum power tracking methods is to continuously adjust ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
Inventor 王冰袁越周建良张一鸣
Owner HOHAI UNIV
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