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Tracking control method for maximum power point of photovoltaic cell

A technology of maximum power point and photovoltaic cells, which is applied in photovoltaic power generation, optical radiation generators, control/regulation systems, etc., can solve the problem that the tracking accuracy and speed of fixed tracking steps cannot be balanced, so as to improve the voltage utilization rate and reduce the Effects of switching loss and oscillation elimination

Active Publication Date: 2012-12-19
CRRC YONGJI ELECTRIC CO LTD
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Problems solved by technology

[0008] The invention solves the problem that the existing interference observation method adopts the fixed tracking step size (△U) and cannot balance the tracking accuracy and speed, and provides a photovoltaic cell maximum power point tracking control method

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  • Tracking control method for maximum power point of photovoltaic cell
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  • Tracking control method for maximum power point of photovoltaic cell

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Embodiment Construction

[0027] The maximum power point tracking control method of photovoltaic cells is realized by the following steps:

[0028] (1) Sampling the photovoltaic cell output voltage U(t) and output current I(t) at time t;

[0029] (2) Calculate the output power P(t) = U(t)*I(t) of the photovoltaic cell at time t, and calculate the output power P(t-1) at time t-1 (ie, the last sampling time), Compare the output voltage U(t-1) and output current I(t-1), dP(t)=P(t)-P(t-1), dU(t)=U(t)-U(t -1),dI(t)=I(t)-I(t-1);

[0030] (3) When dP(t) / dU(t)>0, the operating point of the photovoltaic cell is on the left side of the maximum power point;

[0031] (i) Calculate the short-circuit current and the maximum power point current of the photovoltaic cell at the current moment (at different times, due to the different temperature and light intensity of the photovoltaic cell, the voltage-current curve of the photovoltaic cell will be different, so the short-circuit current at different times will be di...

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Abstract

The invention relates to output power control for a photovoltaic cell, in particular a tracking control method for the maximum power point of a photovoltaic cell, solving problems that the existing interference observation method can not ensure the tracking accuracy and speed at the same time due to use of a fixed tracking step length. According to the invention, based on the interference observation method, tracking accuracy and speed are taken into account by a more reasonable given tracking step length. The method comprises: using a current fixing method when a working point is on the leftof the maximum power point and far from the maximum power point and using a voltage fixing method when the working point is on the right of the maximum power point and far from the maximum power point, thereby realizing fast tracking and modulation when the working point is far from the maximum power point; using a varied step length disturbance method when the working point is near the maximum power point, therefore ensuring fine modification of the working point of the photovoltaic cell when the working point is near the maximum power point, thus, effectively eliminating oscillating of the system near the maximum power point, realizing fast tracking, effectively improving voltage utilization rate and greatly lowering switching waste of power devices.

Description

technical field [0001] The invention relates to photovoltaic cell output power control, in particular to a photovoltaic cell maximum power point tracking control method. Background technique [0002] With the increasingly serious global energy crisis and environmental pollution, it is imperative to develop and utilize clean and renewable energy. Solar energy is one of the cleanest, most realistic and most promising renewable energy sources in the world. Therefore, the utilization of solar energy has received widespread attention from countries all over the world. Among them, photovoltaic grid-connected power generation is the main development trend of solar energy utilization, and it is bound to develop rapidly. [0003] The controller is the core component of the photovoltaic grid-connected power generation system. It is generally composed of a single-chip microcomputer or a microprocessor as the core device. The controller controls the tracking of the maximum power point ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02N6/00G05F1/67
CPCY02E10/56
Inventor 吴晓威李宝恩司军民李学亮白代兵
Owner CRRC YONGJI ELECTRIC CO LTD
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