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High-precision maximum power point tracing method

A maximum power point, high-precision technology, applied in photovoltaic modules, adjusting electrical variables, photovoltaic power generation, etc., to achieve the effects of reducing energy loss, improving tracking accuracy, and overcoming misjudgment

Active Publication Date: 2010-02-17
SUNGROW POWER SUPPLY CO LTD
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Problems solved by technology

[0004] The present invention proposes an MPPT algorithm combining variable step size optimization and power prediction based disturbance observation method, that is, power prediction based variable step size disturbance observation method, which can overcome the disadvantages of conventional disturbance observation method, variable step size disturbance observation method and other methods Disadvantages, solve the problems of misjudgment and local maximum power, and quickly and accurately track to the maximum power point

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Embodiment Construction

[0011] Such as figure 1 As shown, due to the high switching frequency, here we can assume that in a cycle, the rate of change of illumination is constant. KT moment at the voltage V K The power P(K) is measured at , and the reference voltage is not disturbed at this time, and a measurement is added at (K+1 / 2)T time, the power P(K+1 / 2) is measured, and the predicted power is obtained:

[0012] P'(K)=2P(K+1 / 2)-P(K) (1)

[0013] Then increase the reference voltage by ΔV at (K+1 / 2)T time, and measure the voltage V at (K+1)T time K+1 The power at P(K+1), calculate the power value difference dP=P(K+1)-P'(K).

[0014] When implementing the variable step size algorithm, generally when the current change rate is lower than 7%, it is considered that the photovoltaic array works in a similar constant current source region, and the step size of each voltage change is 10% of the original voltage; and when the current change rate When it is higher than 7%, it is considered that the phot...

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Abstract

The invention relates to a high-precision maximum power point tracing method, which is an MPPT algorithm combining variable step-size optimization and a disturbance observation method based on power prediction, i.e. a variable step-size disturbance observation method based on the power prediction. The high-precision maximum power point tracing method can overcome the defects of the conventional disturbance observation method, the variable step-size disturbance observation method, and the like, solve the problems of failure judgment, local maximum power, and the like and quickly and precisely trace a maximum power point.

Description

technical field [0001] The invention relates to methods for tracking maximum power points of various photovoltaic power generation systems. Background technique [0002] For photovoltaic systems, the most important thing is to adjust the PV terminal voltage so that it quickly converges to the maximum power point. The perturbation-and-observation method is widely used because of its simple algorithm and few measurement parameters, but it also has obvious disadvantages: on the one hand, even if it has been running near the maximum power point, the disturbance still does not stop, that is, voltage oscillation occurs, resulting in partial power loss; On the one hand, misjudgment is prone to occur when the light intensity changes rapidly. Because the conventional perturbation and observation method uses a fixed step size for calculation, there are obvious defects: if the step size is too small, the photovoltaic array will stay in the low power output area for a long time; if the...

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Application Information

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IPC IPC(8): H02N6/00G05F1/67H02S10/00
CPCY02E10/58Y02E10/56
Inventor 曹仁贤陈威倪华陶磊
Owner SUNGROW POWER SUPPLY CO LTD
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