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Maximum power point tracking (MPPT) method and device of photovoltaic grid-connected inverter

A technology of inverters and photovoltaics, applied in photovoltaic power generation, instruments, and regulation of electrical variables, etc., can solve problems such as misjudgment of MPPT methods, and achieve the effect of reducing misjudgments and improving accuracy

Inactive Publication Date: 2013-03-27
SHENZHEN GOLDEN HIGHWAY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The embodiment of the present invention provides a photovoltaic grid-connected inverter MPPT method and device to solve the problems of misjudgment and other problems existing in the existing MPPT method

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  • Maximum power point tracking (MPPT) method and device of photovoltaic grid-connected inverter
  • Maximum power point tracking (MPPT) method and device of photovoltaic grid-connected inverter
  • Maximum power point tracking (MPPT) method and device of photovoltaic grid-connected inverter

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Embodiment 2

[0050] Please refer to Image 6 , The embodiment of the present invention also provides a photovoltaic grid-connected inverter MPPT device, including:

[0051] Sampling unit 310, prediction unit 320, perturbation unit 330, and processing unit 340;

[0052] The sampling unit 310 is used for sampling at kT and (k+1)T to obtain the power P(k) of the photovoltaic grid-connected inverter at kT and the power P at (k+1)T (K+1 / 2), the working voltage of the photovoltaic grid-connected inverter at kT and (k+1)T is U(k), and k is a natural number;

[0053] The prediction unit 320 is used to predict the power P'() of the photovoltaic grid-connected inverter corresponding to the working voltage U(k) at time (k+2)T according to P(k) and P(k+1 / 2) K);

[0054] The disturbance unit 330 is used to increase the voltage disturbance at time (k+1)T , So that the working voltage of the photovoltaic grid-connected inverter at time (k+2)T is U(k+2), U(k+2)= U(k)+ ;

[0055] The sampling unit 310 is also u...

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Abstract

The invention discloses a maximum power point tracking (MPPT) method of a photovoltaic grid-connected inverter. The MPPT method comprises the steps of firstly, performing sampling at kT and (k+1)T; forecasting power P'(K) at (k+2)T according to the measured P(k) and P(k+1 / 2); then increasing voltage disturbance; performing sampling at the (k+2)T; and judging the position of a maximum power point of the photovoltaic grid-connected inverter according to the measured P(k+1) and the forecasted P'(K). The invention further provides a corresponding device. Due to the fact that the forecasted data and actual data are on the same photovoltaic property curve, the accuracy is improved, and erroneous judgement is reduced.

Description

Technical field [0001] The invention relates to the technical field of photovoltaic grid-connected inverters, in particular to a photovoltaic grid-connected inverter MPPT method and device. Background technique [0002] Photovoltaic grid-connected inverters can invert the direct current output from photovoltaic cells into alternating current, and merge the standard alternating current into the grid. It is the core of the grid-connected photovoltaic power generation system's energy conversion and control process. [0003] Because the photovoltaic cell characteristic curve has a unique maximum power point at any time, it is necessary to use the MPPT (Maximum Power Point Tracking, maximum power point tracking) control algorithm to make the system work at the maximum power point. Currently, self-optimizing control schemes are mainly used, such as disturbance observation method and conductance increment method. This type of method can theoretically track to the maximum power point by c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38G05F1/67
CPCY02E10/58Y02E10/56
Inventor 翦志强司徒琴张灿烂
Owner SHENZHEN GOLDEN HIGHWAY TECH CO LTD