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Device and method for tracking photovoltaic maximum power point

A technology of maximum power point and tracking device, applied in optical radiation generators, generators/motors, electrical program control, etc. The effect of enhancing adaptability and improving stability

Inactive Publication Date: 2010-01-27
HOHAI UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

[0004] The present invention proposes a photovoltaic power generation maximum power point tracking device and its tracking method in order to solve the problems of search speed, step size setting and environmental change adaptability of the disturbance observation method in MPPT in the background technology

Method used

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  • Device and method for tracking photovoltaic maximum power point
  • Device and method for tracking photovoltaic maximum power point
  • Device and method for tracking photovoltaic maximum power point

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Embodiment Construction

[0024] Such as figure 1 Shown is the MPPT device principle structure schematic diagram of the present invention, and its structure comprises: disturbance observation algorithm module, experience database, signal input detection circuit and PWM drive circuit, wherein: signal input detection circuit mainly detects four input signals: ambient temperature T , light intensity L, photovoltaic array output voltage U and output current I; the PWM drive circuit adjusts the duty cycle of the step size, thereby changing the output voltage; the empirical database and the disturbance observation algorithm module constitute the core part of the present invention, and they are described in detail below Principle and function:

[0025] (1) Establishment and operation of the empirical database: take the temperature value T as the X coordinate axis, the light intensity value L as the Y coordinate axis, and use the maximum power point tracked by the algorithm module as the value to establish a d...

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Abstract

The device discloses a device and a method for a photovoltaic maximum power point, belonging to the control field of tracking the maximum power point in a photovoltaic system. The device structure comprises a core control circuit, a voltage and current detection circuit, a signal conditioning circuit, a drive circuit, a DC / DC conversion circuit, a temperature sensor and a light intensity sensor. The principle structure comprises a signal input detection circuit, a PWM drive circuit, a disturbance observing algorithm module and an experience database. The tracking method comprises the following steps: completing initialization operation of the disturbance observing algorithm based on the experience database; carrying out algorithm circulation operation and updating the database; and renewedly carrying out the initialization operation and entering a new round circulation when the maximum power point jumps due to the change of the environment. The invention has clear structure, clear function and convenient realization, thereby improving the tracking efficiency of the maximum power point and increasing the adaptation capacity on the external environment by the photovoltaic system.

Description

technical field [0001] The invention relates to a maximum power point tracking device and a tracking method of a photovoltaic power generation system in high-precision tracking control technology in solar heat utilization, and belongs to the field of maximum power point tracking control in photovoltaic power generation systems. Background technique [0002] In photovoltaic power generation systems, the Maximum Power Point Tracking (MPPT) problem is one of the most concerned issues for researchers, that is, to keep the system working at the peak point of the power curve and convert solar energy into electrical energy with maximum efficiency. [0003] When choosing an optimization method, it is necessary to consider many factors, including the difficulty of implementation, economic cost, tracking speed, adaptability, etc., especially the light and temperature of the external environment, which have a great influence on the maximum power point on the voltage / power curve. Theref...

Claims

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Application Information

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IPC IPC(8): H02N6/00G05B19/04
Inventor 王冰周其进
Owner HOHAI UNIV
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