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Maximum power point tracking (MPPT) method of self-adaption disturbance frequency and step

A technology of maximum power point and disturbance frequency, which is applied in photovoltaic power generation, instruments, and regulation of electric variables, etc., can solve the problem that the MPPT tracking effect cannot be changed with a variable disturbance step size, and achieve the guarantee of effectiveness and stability, stability, Guaranteed fast results

Inactive Publication Date: 2013-04-03
SHANGHAI CONVERTERGY ENERGY TECH
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Problems solved by technology

However, corresponding to different disturbance step sizes, the time for the output voltage to reach stability is not the same. Therefore, the method of fixing the MPPT cycle cannot make the MPPT tracking effect of variable disturbance step size optimal.

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  • Maximum power point tracking (MPPT) method of self-adaption disturbance frequency and step
  • Maximum power point tracking (MPPT) method of self-adaption disturbance frequency and step
  • Maximum power point tracking (MPPT) method of self-adaption disturbance frequency and step

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[0043] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific illustrations.

[0044] For the convenience of description, the following combined figure 1 And attached figure 2 The technical solution of the present invention is described.

[0045] According to attached figure 1 The photovoltaic cell output voltage shown in u PV and output power p PV It can be seen from the curve that the output power of photovoltaic cells is far from the maximum power point (attached figure 1 The farther the output power is from the M point), the smaller the output power is, and the larger the slope of the curve is, and near the maximum power point, the photovoltaic cell output power is the largest but the efficiency of the curve is the smallest. Therefore, in order to make the output power of the photovoltaic cell reach the maximum pow...

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Abstract

The invention discloses a maximum power point tracking (MPPT) method of self-adaption disturbance frequency and step, and particularly relates to a maximum power point tracking method of a solar photovoltaic cell and belongs to the technical field of new energy. The MPPT method comprises the following steps of: after each disturbance (namely changing an output voltage reference value of the photovoltaic cell), calculating the difference of the power before and after disturbance when the output voltage of the photovoltaic cell is in a steady state, and ensuring the judging accuracy of power changing direction; accumulating the power difference to accurately obtain the changing direction of the power after each disturbance; and regulating the disturbance step in real time according to the time of the reference values accumulated by the power difference, and regulating the reference values of the power accumulated values in real time according to the output power of the photovoltaic cell. Therefore, the maximum power point can be rapidly and accurately tracked, the disturbance frequency and the disturbance step near the maximum power point are minimum, the power loss caused by disturbance can be effectively avoided, and the maximization of the output power of the photovoltaic cell is realized.

Description

technical field [0001] The invention belongs to the field of new energy technology, and relates to a maximum power point tracking method for solar photovoltaic cells, in particular to a maximum power point tracking method with adaptive disturbance frequency and step size, that is, the MPPT (Maximum Power Point Tracking) method . Background technique [0002] The worldwide energy crisis and environmental problems have made solar photovoltaic power generation technology a focus of attention and research in various countries. [0003] Solar photovoltaic cells are the core and key components of photovoltaic power generation systems. The output voltage u of solar photovoltaic cells under specific light and temperature conditions PV and output power p PV The typical relationship curve is attached figure 1 shown. According to attached figure 1 It can be seen that under the same external environmental conditions, the output power of photovoltaic cells has a corresponding relati...

Claims

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Application Information

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IPC IPC(8): G05F1/67
CPCG05F1/67Y02E10/56
Inventor 吴红飞常东升邢岩高峰
Owner SHANGHAI CONVERTERGY ENERGY TECH
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