Device and method for controlling MPPT of solar pvelectricity generating system

A technology for solar photovoltaic and power generation systems, applied in the field of maximum power point tracking devices, to avoid slow tracking speed

Active Publication Date: 2009-12-09
CHINA MERCHANTS NEW ENERGY SHENZHEN
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  • Abstract
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Problems solved by technology

The traditional voltage perturbation method uses a fixed step size to perturb the output voltage of the photovoltaic array, and there is a problem that the operating voltage swings near the maximum operating voltage of the photovoltaic array.

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  • Device and method for controlling MPPT of solar pvelectricity generating system

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Embodiment Construction

[0028] The technical solution of the invention is described in detail below in conjunction with the accompanying drawings:

[0029] figure 1 It is the principle block diagram of the present invention. As shown in the figure, the maximum power point tracking (MPPT) control device 1 of the present invention includes an MPPT sampling circuit 11 , a driving circuit 12 , a current sampling circuit 13 , a voltage sampling circuit 14 and a DSP processor 15 . The DSP processor 15 is a DSP chip of TI company model TMS320LF2812, which includes an MPPT variable-step tracking module 151 , a PWM generation module 152 , a voltage and current double closed-loop control module 153 and a phase-locked loop module 154 .

[0030] The MPPT sampling circuit 11 collects the output DC voltage U of the photovoltaic array dc and output current I dc , and send the sampled signals to the DSP processor 15 . The current sampling circuit 13 collects the output current I of the three-phase grid-connected...

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Abstract

The invention discloses a device and a method for controlling MPPT of a solar pvelectricity generating system. The device comprises an MPPT sampling circuit, a drive circuit, a current sampling circuit, a voltage sampling circuit and a DSP processor. The method comprises the following steps that: when a disturbance direction keeps constant for 3 times, a voltage disturbance value is multiplied by an exponent of 2 so as to rapidly track to the maximum power point; and when Udc swings near U PMAX, the voltage disturbance value is divided by the exponent of 2 so as to reduce the swing range of photovoltaic array voltage Udc and to make the Udc stabilized on the photovoltaic array output voltage U PMAX point corresponding to the maximum output power point. The device and the method avoid the phenomena of low tracking speed and swinging near the maximum work voltage in the prior maximum power point tracking technology.

Description

technical field [0001] The invention relates to an MPPT control device and method for a solar photovoltaic power generation system, belonging to a maximum power point tracking device and method. Background technique [0002] Photovoltaic power generation technology based on the utilization of solar energy has received extensive attention, but the output power of photovoltaic cells is affected by the temperature of photovoltaic cells and the intensity of solar radiation. Under the same radiation conditions, the higher the temperature of the photovoltaic cell, the lower the open-circuit voltage of the photovoltaic cell, and the lower the output power; on the contrary, the lower the temperature of the photovoltaic cell, the higher the open-circuit voltage of the photovoltaic cell, and the lower the output power. big. At the same photovoltaic cell temperature, the stronger the radiation intensity irradiating the photovoltaic cell, the higher the short-circuit current of the pho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02N6/00G05F1/67H02S10/00
CPCY02E10/50
Inventor 徐永邦刘小宝朱国军史君海樊荟邓霞王斌
Owner CHINA MERCHANTS NEW ENERGY SHENZHEN
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