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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

Active Publication Date: 2014-11-19
SHENZHEN KSTAR NEW ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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 Work at the maximum power point, thereby reducing the system's power generation and power generation efficiency; and due to the characteristics of photovoltaic strings, the degree of pollution and the degree of aging are inconsistent, the maximum power point of each string will definitely be different

Method used

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  • Efficient photovoltaic power generation system
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  • Efficient photovoltaic power generation system

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Such as figure 1 , image 3 and Figure 4 As shown, this example provides a high-efficiency photovoltaic power generation system, including: a DC / DC module, an inverter, and at least two parallel strings, each of which is connected to a DC / DC module; One input terminal of the DC / DC module is connected to the positive pole of the bus bar, and the other input terminal is connected to the negative pole of the bus bar; the two output terminals of the DC / DC module are respectively connected to the bus bar and the group string or are respectively connected to the bus bar through the group string; The positive pole of the busbar and the negative pole of the busbar are respectively connected to the inverter; when the busbar voltage V is equal to the voltage V corresponding to the maximum power point of any string n When inconsistent, the DC / DC module corresponding to the string outputs the compensation voltage ΔV n To the working circuit where the group string is located, so...

Embodiment 2

[0044] Such as figure 1 As shown, on the basis of Embodiment 1, one output terminal of the DC / DC module described in this example is connected to the negative pole of the bus bar, and the other output terminal of the DC / DC module is respectively connected to the respective negative poles of the strings, so The positive poles of the strings are respectively connected to the positive poles of the busbars.

[0045] One input end of the DC / DC module is connected to the positive pole of the bus bar, and the other input end is connected to the negative pole of the bus bar; one output end of the DC / DC module is connected to the negative pole of the bus bar, and the other output end is connected to the respective bus bar negative pole. In this way, the DC / DC modules are placed in series at the bottom of the strings. On the basis of improving the power generation, power generation efficiency and cost control of the photovoltaic power generation system, it also makes the wiring simple a...

Embodiment 3

[0048] Such as image 3 As shown, different from Embodiment 1, one output terminal of the DC / DC module described in this example is connected to the positive pole of the bus bar, and the other output terminal of the DC / DC module is respectively connected to the positive pole of the respective strings, so The negative pole of the string is connected to the negative pole of the bus bar.

[0049] That is to say, the DC / DC module is connected in series on the top of the string, one input end of the DC / DC module is connected to the positive pole of the bus bar, and the other input end is connected to the negative pole of the bus bar; the DC / DC module is connected to the negative pole of the bus bar; One output end of the module is connected to the positive pole of the bus bar, and the other output end is connected to the top end of each string. On the basis of improving the power generation capacity, power generation efficiency and control cost of the photovoltaic power generation ...

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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%.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02S40/30H02S40/32H02M3/155G05F1/67
CPCY02E10/56
Inventor 刘程宇温志伟黄慧金王飞江红胜
Owner SHENZHEN KSTAR NEW ENERGY CO LTD
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