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A power optimizer and a photovoltaic power generation system

A photovoltaic power generation system and power optimizer technology, applied in photovoltaic power generation, electrical components, circuit devices, etc., can solve the problems of low efficiency of photovoltaic power generation system systems

Active Publication Date: 2019-01-11
SUNGROW POWER SUPPLY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the inventor found that the power optimizer adds a DC / DC power converter to the photovoltaic power generation system, that is, the DC power of the photovoltaic module needs to be converted by the DC / DC of the power optimizer, and then passed through the inverter. The DC / AC is transmitted to the subsequent grid or load, and the two-stage power conversion leads to low system efficiency of the photovoltaic power generation system

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Embodiment Construction

[0053] It can be seen from the background technology that although the power optimizer maximizes the output power of each photovoltaic module and eliminates the series-parallel mismatch of photovoltaic modules, it adds a DC / DC power converter to the photovoltaic power generation system. The DC power needs to be converted by the DC / DC of the power optimizer, and then transmitted to the subsequent power grid or load through the DC / AC of the inverter. The two-stage power conversion leads to low system efficiency of the photovoltaic power generation system. Especially when the series-parallel mismatch between photovoltaic modules is small, or there is only a part of the day when there is a series-parallel mismatch (moving shadow occlusion), the increase in power generation brought by the MPPT of the power optimizer may not be able to compensate for the DC The power generation loss caused by the efficiency loss of / DC conversion leads to the reduction of system power generation.

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Abstract

The invention provides a power optimizer and a photovoltaic power generation system, wherein an input terminal of a converter in the power optimizer is connected with at least one photovoltaic moduleas an input terminal of the power optimizer. The output of the converter is used as the output of the power optimizer, and the outputs of several power optimizers are connected in series. The controller is electrically connected with the converter and acquires a first electrical parameter of the converter. When the first electrical parameter is smaller than a first threshold value, the controllercontrols the converter to be in a power conversion mode so that the converter converts the DC electric energy of the photovoltaic module. When the first electrical parameter is greater than the firstthreshold value, the converter is controlled to be in the through mode so that the output end of the converter is directly connected with the input end. At this time, only the power conversion of theinverter exists between the photovoltaic module at the input end of the converter and the power grid or the load, thereby eliminating the DC / DC conversion efficiency loss of the converter. The more the number of converters in through mode in photovoltaic power generation system, the higher the system efficiency.

Description

technical field [0001] The invention relates to the technical field of photovoltaic power generation, in particular to a power optimizer and a photovoltaic power generation system. Background technique [0002] With the rapid development of photovoltaic power generation, the requirements for the power generation efficiency of photovoltaic modules are gradually increasing. Usually, such as figure 1 As shown, in order to improve the power generation efficiency of photovoltaic modules, a power optimizer can be connected in parallel to the photovoltaic module, and the power optimizer connected in series can be connected in parallel to the inverter, and the inverter converts direct current into alternating current to realize grid connection. [0003] Specifically, the power optimizer is a DC / DC converter that implements MPPT (Maximum Power Point Tracking) for photovoltaic modules, such as buck, boost, and 4-switch symmetrical buckboost converters, etc., to obtain the maximum Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
CPCH02J3/385Y02E10/56
Inventor 俞雁飞杨宗军倪华陈华进
Owner SUNGROW POWER SUPPLY CO LTD
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