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MPPT (maximum power point tracking) compensator of photovoltaic power generation system

A photovoltaic power generation system and compensator technology, applied in photovoltaic power generation, control/regulation systems, instruments, etc., can solve the problems of reducing the power generation of the system, the difference of the maximum power point, the inconsistency of the pollution degree and aging degree of the photovoltaic strings, etc. Improve the effect of power generation, large differences in shielding positions, and large differences in characteristics

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 power generation of the system; and due to the differences in the characteristics of the photovoltaic strings, the degree of pollution and the degree of aging, the maximum power point of each string will definitely be different

Method used

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  • MPPT (maximum power point tracking) compensator of photovoltaic power generation system
  • MPPT (maximum power point tracking) compensator of photovoltaic power generation system
  • MPPT (maximum power point tracking) compensator of photovoltaic power generation system

Examples

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Effect test

Embodiment 1

[0032] Such as figure 1 As shown, this example provides an MPPT compensator for a photovoltaic power generation system, including: a DC / DC module, an inverter, and at least two strings connected in parallel; one input end of the DC / DC module is connected to the positive pole of the bus bar , 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 bus bar, and the other output end is connected in series with the respective group strings, and the group strings are respectively connected to the bus bar; the bus bar The positive pole 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 outputs a compensation voltage ΔV n To the working loop where the string is located, so that each string works at its maximum power point, wherein the compensat...

Embodiment 2

[0041] Such as image 3 As shown, the difference from Embodiment 1 is that 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 connected to the positive poles of each string. The negative pole of the bus is connected to the negative pole of the busbar.

[0042] 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 and cost control of the photovoltaic power generation system, it also makes the wiring simple and cle...

Embodiment 3

[0044] On the basis of Embodiment 1 or Embodiment 2, the DC / DC module described in this example includes at least two DC / DC units, the number of the DC / DC units is equal to the number of strings, and each string is connected A one-to-one DC / DC unit. Through the most basic DC / DC unit to build a multi-output DC / DC module, each string is connected to a one-to-one corresponding DC / DC unit, and each DC / DC unit has MPPT function, so that each The MPPT control of the string is more flexible and effective, with strong pertinence and high efficiency.

[0045] In this example, at least two DC / DC units are connected in parallel with each other, and one output terminal of the DC / DC unit is directly connected to the bus bar, and the other output terminal is connected in series with the respective corresponding strings.

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Abstract

The invention provides an MPPT (maximum power point tracking) compensator of a photovoltaic power generation system. The MPPT compensator comprises a DC / DC module, an inverter and at least two strings. The strings are connected with one another in parallel, and each string is connected to the DC / DC module; an input end of the DC / DC module is connected to an anode of a bus, and another input end of the DC / DC module is connected to a cathode of the bus; two output ends of the DC / DC module are respectively connected with the bus and the strings or are respectively connected to the bus by the strings; the DC / DC module which corresponds to the strings outputs compensation voltages delta V<n> when voltages V of the bus are inconsistent with a voltage V<n> which corresponds to the maximum power point of an optional string, so that each string can work at the maximum power point of the string, and the compensation voltages delta V<n> meet an equation of delta V<n>=V-V<n>. The MPPT compensator has the advantages that each string is serially connected with the DC / DC module, accordingly, voltage compensation can be carried out for each string, the various strings can work at the maximum power points, and the gross power generation of the photovoltaic power generation system can be increased by 3-5%.

Description

technical field [0001] The invention relates to an MPPT compensator, in particular to an MPPT compensator for a 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 of the system; and due to the differences in t...

Claims

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Application Information

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