Voltage converter for power optimization and mode switching method thereof

A voltage converter and power optimization technology, applied in photovoltaic power generation, single grid parallel feeding arrangement, etc., can solve problems such as unbalanced power loss of photovoltaic modules

Active Publication Date: 2019-05-21
FONRICH NEW ENERGY TECH LTD
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  • Application Information

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Problems solved by technology

Considering the above disadvantages of photovoltaic power plants, especially the mismatch of photovoltaic modules, the mismatch is mainly caused by the combination of battery voltage and current, the battery is blocked by buildings or the sur

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  • Voltage converter for power optimization and mode switching method thereof
  • Voltage converter for power optimization and mode switching method thereof
  • Voltage converter for power optimization and mode switching method thereof

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Embodiment Construction

[0072] Below in conjunction with each embodiment, the technical solution of the present invention is clearly and completely set forth, but described embodiment is only the embodiment that the present invention is used for describing description and not all embodiments, based on these embodiments, this invention The solutions obtained by those skilled in the art without creative work all belong to the protection scope of the present invention.

[0073] In the field of solar power generation using photovoltaic modules, shadow shading will cause mismatch between photovoltaic modules. The battery output characteristics of photovoltaic modules are reflected in the close relationship between output voltage and output current and external factors such as light intensity and ambient temperature. The uncertainty of environmental factors causes the maximum output power and the corresponding voltage of the maximum power point to change with the change of external factors. It is the purpos...

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Abstract

The invention relates to a voltage converter for power optimization and a mode switching method thereof. The voltage converter is used for absorbing electric energy from a corresponding photovoltaic module and is connected in series, output voltages of the voltage converters are superposed to obtain a DC bus voltage, an expected voltage output from the voltage converter is equal to a ratio, whichis calculated by an external power provided by the corresponding photovoltaic module on the total power, multiplied by a set value of the DC bus voltage, the voltage converter enters a first mode of voltage drop when the ratio of the expected voltage sum of the voltage converters and maximum power point voltage of the corresponding photovoltaic module does not first gain, the voltage converter enters a second mode of voltage rising when the ratio of the expected voltage sum output from the voltage converter and the maximum power point voltage of the corresponding photovoltaic module is not lower than a second gain, and the voltage converter enters a third mode which an output voltage is equal to an input voltage when the ratio of the expected voltage sum output from the voltage converter and the maximum power point voltage of the corresponding photovoltaic module is between the first gain and the second gain.

Description

technical field [0001] The present invention mainly relates to the field of solar power generation, more precisely, it relates to a switching scheme for DC power supply adaptively adopting step-up or step-down in a power generation system containing photovoltaic modules to ensure the smoothness of the DC bus voltage changes to avoid excessive oscillations and minimize power losses in the voltage converter. Background technique [0002] In the large-scale centralized and battery string lumped optimization scheme, the goal is to complete the maximum power point tracking at the level of the battery string composed of components connected in series. The disadvantage is that if some batteries in the battery string are aging or damaged Or when it is in the state of being shaded, it will seriously affect the overall power generation efficiency of a battery string. The industry's countermeasures, the main solution is to equip each component with an independent power optimizer and...

Claims

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Application Information

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IPC IPC(8): H02J3/38
CPCY02E10/56
Inventor 张永胡晓磊
Owner FONRICH NEW ENERGY TECH LTD
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