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Current control ring hysteresis comparing method for photovoltaic cell

A current control loop, photovoltaic cell technology, applied in photovoltaic power generation, optical radiation generators, control/regulation systems, etc., can solve problems such as power loss, inability to take into account tracking accuracy and response speed, and achieve stable and efficient power.

Inactive Publication Date: 2012-08-22
ZHEJIANG TOPOINT PHOTOVOLTAIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage is that the setting of the tracking step size cannot take into account the tracking accuracy and response speed, and it will oscillate near the maximum power point, resulting in a certain power loss

Method used

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  • Current control ring hysteresis comparing method for photovoltaic cell
  • Current control ring hysteresis comparing method for photovoltaic cell
  • Current control ring hysteresis comparing method for photovoltaic cell

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Embodiment Construction

[0009] The technical solutions of the present invention will be further specifically described below through the embodiments and in conjunction with the accompanying drawings.

[0010] Such as figure 1 with figure 2 As shown, the current control loop hysteresis comparison method of photovoltaic cells is to take three photovoltaic output currents, which are respectively I a , I b , I c , and I a b c , respectively read the corresponding output voltage V, and calculate the output power of these three different currents P=V×I, denoted as P a , P b , P c ; if I b less than the maximum power current, there will be P a b c , then increase I b ; if I b greater than the maximum power current, there will be a P a >P b >P c At this time, it is necessary to reduce the I b ; if I b equal to the maximum power current, then P b greater than P a and P c , keep the original I b current value.

[0011] This method can be used in current-controlled photovoltaic inverters. T...

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Abstract

The invention relates to a current control ring hysteresis comparing method for a photovoltaic cell. The conventional perturbation method for current control has defects that tracing precision and response speed cannot be both considered when a tracing step length is set. The current control ring hysteresis comparing method is characterized by comprising the following steps of: taking three photovoltaic output currents of Ia, Ib and Ic, wherein the Ib is an adjustment target value and the Ib is more than the Ia and less than the Ic; respectively reading corresponding output voltages V; calculating output powers P of the three different current being equal to V*I, and respectively recording the output powers as Pa, Pb and Pc; if the Ib is less than a maximum power current and the Pb is more than the Pa and less than the Pc, increasing the Ib; if the Ib is more than the maximum power current and the Pb is more than the Pa and less than the Pc, decreasing the Ib; and if the Ib is equal to the maximum power current and the Pb is more than the Pa and the Pc, keeping the current value of the former Ib. The current at an output end provided by the invention can stably follow environment variation, so that an entire photovoltaic cell system does not vibrate, and the obtained power is stable and efficient.

Description

technical field [0001] The invention relates to a current control hysteresis comparison method of a photovoltaic cell. Background technique [0002] The output power of photovoltaic cells is a nonlinear function according to the ambient temperature and light intensity. Under the condition that other conditions remain unchanged, the output power of photovoltaic cells decreases with the increase of ambient temperature; under the condition of other conditions remaining unchanged, the output power of photovoltaic cells increases with the increase of light intensity. Under certain environmental conditions, photovoltaic cells have a unique maximum output power, that is, the maximum power point. For this reason, photovoltaic cells must be controlled by maximum power point tracking to achieve maximum power output under different environmental conditions. [0003] At present, the disturbance method is usually used to continuously adjust the working state of the photovoltaic cell, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02N6/00G05F1/67
CPCY02E10/56
Inventor 吴秋轩潘锦铮罗艳斌林伟杰
Owner ZHEJIANG TOPOINT PHOTOVOLTAIC