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Photovoltaic inverter control method and system

A photovoltaic inverter and control method technology, which is applied in photovoltaic modules, photovoltaic power generation, and irreversible DC power input conversion into AC power output, etc. efficiency and other issues to achieve the effect of reducing self-loss, increasing power generation, and improving work efficiency

Active Publication Date: 2015-01-07
SUNGROW POWER SUPPLY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, it has been found through research that the operating frequency of the switching tube S in the Boost circuit is directly related to the loss of the Boost circuit, and the various types of losses in the Boost circuit will change with the power of the photovoltaic inverter. It can be seen that , the existing way of using a fixed frequency to control the switching tube in the Boost circuit cannot effectively reduce the loss of the Boost circuit itself, which affects the efficiency of the photovoltaic inverter

Method used

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  • Photovoltaic inverter control method and system
  • Photovoltaic inverter control method and system

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Embodiment 1

[0044] refer to figure 2 The shown flow chart of an embodiment of a control method for a photovoltaic inverter of the present invention is applied to a photovoltaic power generation system, and the method may include the following steps:

[0045] Step S11: Obtain the current state value of the photovoltaic inverter.

[0046] In this embodiment, the current state value may specifically be: the input current of the voltage regulation circuit of the photovoltaic inverter, the input current and input voltage of the voltage regulation circuit of the photovoltaic inverter, the inverter circuit of the photovoltaic inverter The input current of the photovoltaic inverter, the input voltage of the inverter circuit of the photovoltaic inverter, or the current power of the photovoltaic inverter, etc., are not specifically limited in the present invention.

[0047] Wherein, the voltage adjustment circuit can be a Boost circuit, a double Boost circuit, a buck-boost circuit, etc., a circui...

Embodiment 2

[0061] refer to image 3 Shown is a schematic flowchart of a specific embodiment of another photovoltaic inverter control method of the present invention, the method may specifically include the following steps:

[0062] Step S21: Obtain the current state value of the voltage regulation circuit of the photovoltaic inverter.

[0063] Step S22: comparing the current state value with the preset state thresholds of each frequency grade, and determining the target frequency grade to which the current state value belongs;

[0064] Specifically, this embodiment may judge whether the current state value is greater than the preset state threshold of the frequency class according to the order of the state thresholds of the preset frequency classes from small to large, and if so, use the currently judged frequency class as the target Frequency level, if not, continue to judge whether the current state value is greater than the state threshold of the next frequency level, until the targe...

Embodiment 3

[0072] refer to Figure 4 Shown is a schematic structural diagram of a control system embodiment of a photovoltaic inverter of the present invention, the system may include:

[0073] The obtaining module 31 is used to obtain the current state value of the photovoltaic inverter.

[0074] In this embodiment, the current state value obtained by the obtaining module 31 may be the input current of the voltage regulation circuit of the photovoltaic inverter, or the input current and input voltage of the voltage regulation circuit of the photovoltaic inverter, or the The input current of the inverter circuit of the photovoltaic inverter, or the input voltage of the inverter circuit of the photovoltaic inverter, or the current power of the photovoltaic inverter.

[0075] A determining module 32, configured to determine a switching frequency corresponding to the current state value by using a preset rule as a target switching frequency;

[0076] Optionally, the determination module 3...

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Abstract

The application provides a photovoltaic inverter control method and system. The photovoltaic inverter control method comprises the following steps: obtaining the current status value of the photovoltaic inverter, determining the switching frequency corresponding to the current status value through a preset correspondence rule, taking the determined switching frequency as the target switching frequency, and adjusting the current switching frequency of a voltage regulator circuit of the photovoltaic inverter, so as to lower the loss of the voltage regulator circuit of the photovoltaic inverter under the current state, and improve the working efficiency of the photovoltaic inverter under a low light working condition, thus the generating capacity is increased.

Description

technical field [0001] The present invention mainly relates to the application field of photovoltaic power generation systems, and more specifically relates to a photovoltaic inverter control method and system. Background technique [0002] Photovoltaic inverter is an inverter used in solar power generation system. It is an important part of photovoltaic power generation system. Its efficiency directly affects the efficiency of photovoltaic power generation system. The front-stage circuit is usually a DC-DC conversion circuit used to achieve maximum power point tracking, and the rear-stage circuit is an inverter circuit used to convert the direct current output by the DC-DC conversion circuit into alternating current and send it to the grid. In practical applications, in the working environment with weak light such as sunrise, sunset, cloudy, etc., the output voltage of the solar cell often cannot reach the voltage required by the inverter bus bar of the subsequent stage. At...

Claims

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Application Information

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IPC IPC(8): H02M3/10H02M7/48H02S40/32
CPCH02M3/10H02M7/48H02S40/00H02M1/0048Y02B70/10Y02E10/56
Inventor 王鼎奕刘雷
Owner SUNGROW POWER SUPPLY CO LTD
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