Efficient photovoltaic power generation system

A photovoltaic power generation system, high-efficiency technology, applied in photovoltaic power generation, photovoltaic modules, control/regulation systems, etc., can solve problems such as reducing system power generation and power generation efficiency, inconsistent pollution and aging degrees, and differences in photovoltaic string characteristics , to achieve the effect of increasing power generation and power generation efficiency, increasing power generation, and fast compensation response
CN104158482AActive Publication Date: 2014-11-19SHENZHEN KSTAR NEW ENERGY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHENZHEN KSTAR NEW ENERGY CO LTD
Publication Date
2014-11-19

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Abstract

The invention provides an efficient photovoltaic power generation system, which comprises DC / DC modules, an inverter and at least two serial strings which are mutually in parallel connection, wherein each serial string is connected with one DC / DC module; the two input ends of each DC / DC module are respectively connected to the positive pole and the negative pole of a bus; the two output ends of each DC / DC module are respectively connected with the bus and the corresponding serial string or are connected with the bus through the corresponding serial string; when the bus voltage V is inconsistent with voltage Vn corresponding to the maximum power point of any of the serial strings, the offset voltage Delta Vn is output by the DC / DC module corresponding to the serial string, so that each serial string works at the maximum power point, wherein the offset voltage Delta Vn equals to the difference value of V and Vn. Through the method that each serial string is in series connection with the corresponding DC / DC module, so that voltage compensation can be performed on each serial string, all the serial strings work at the maximum power points during operation and the gross generation of the photovoltaic power generation system is improved by 3% to 5%.
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Description

technical field

[0001] The invention relates to an MPPT compensator, in particular to a high-efficiency photovoltaic power generation system. Background technique

[0002] Due to the differences of the solar panels themselves, even if different strings in the photovoltaic power generation system are connected in series with the same number of solar panels, the total output voltage of the photovoltaic strings is not necessarily the same, which will lead to the maximum output voltage of each photovoltaic string. There will also be a difference in power point. However, the solar photovoltaic power generation system has been applied on a large scale. A large-scale photovoltaic power station combines all string panels together, but only one MPPT. Then, the power generation system of this large-scale photovoltaic power station cannot make each photovoltaic string Working at the maximum power point reduces the power generation and efficiency of the system; however, due to differen...

Claims

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