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Method for tracing maximum power point of photovoltaic miniature grid-connected inverter

A technology of maximum power point and inverter, which is applied in photovoltaic power generation, instruments, and regulation of electrical variables, etc., can solve problems such as unfavorable system efficiency and large harmonics of grid-connected current, so as to improve system efficiency, improve harmonics, and improve The effect of overall indicators

Active Publication Date: 2011-07-27
上海岩芯电子科技有限公司
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Problems solved by technology

[0003] When the light intensity of the environment is relatively low, the photovoltaic cells work in a low power state. At this time, the traditional micro grid-connected inverter is continuously connected to the grid with low power, resulting in a low inverter efficiency and relatively large harmonics of the grid-connected current. , which is very detrimental to the overall system efficiency

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  • Method for tracing maximum power point of photovoltaic miniature grid-connected inverter

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Embodiment Construction

[0026] Preferred embodiments of the present invention are described in detail as follows in conjunction with accompanying drawings:

[0027] The method for tracking the maximum power point of a photovoltaic micro-grid-connected inverter, the control steps are as follows:

[0028] (1) Run the continuous working mode and perform maximum power point tracking control;

[0029] (2) Sampling photovoltaic cell current i pv and voltage u pv , to calculate the photovoltaic cell power P pv = u pv *i pv ;

[0030] (3) Compare P pv and power threshold P set size, if P pv >P set , then execute step (1), otherwise execute step (4), where P set According to the rated power setting of the inverter, the general value is 30% of the rated power;

[0031] (4) Calculating the grid-connected period N under the intermittent working mode on and energy storage period N off , run the intermittent work mode;

[0032] (5) If it is currently the grid-connection cycle, execute the grid-connec...

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Abstract

The invention relates to a method for tracing a maximum power point of a photovoltaic miniature grid-connected inverter. When the output power of a photovoltaic cell is high, the traditional continuous operating mode and a maximum power point tracing method are adopted; and when the output power of the photovoltaic cell is low, intermittent operating mode is adopted, namely operation is continuously performed for a plurality of periods with set power, then operation is stopped for a while to store energy to a capacitor, and simultaneously maximum power point tracing is performed with voltage change rate in the energy storage period, so as to ensure that the photovoltaic cell is operated at maximum power point voltage. The method can effectively solve the problems that the efficiency of a traditional inverter is low when the illumination intensity is low, grid-connected current harmonic wave is large, and the like.

Description

technical field [0001] The invention relates to a method for tracking the maximum power point of a photovoltaic micro grid-connected inverter, belonging to the technical field of new energy generation control systems. Background technique [0002] Micro photovoltaic grid-connected inverter installs a micro-inverter integrating various protection and control functions on the back of each photovoltaic module. The micro-inverter converts the electric energy into alternating current and directly connects it to the grid. Several identical modules are connected in parallel with the grid. Constitute photovoltaic grid-connected power generation system. Compared with the traditional centralized photovoltaic grid-connected power generation system, the maximum power point tracking of each module of the micro photovoltaic grid-connected inverter can reduce the power loss caused by component mismatch or partial shading, and improve the efficiency of the system. [0003] When the light i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02N6/00G05F1/67
CPCY02E10/58Y02E10/563Y02E10/56
Inventor 黄建明杨宇吴春华
Owner 上海岩芯电子科技有限公司
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