Auto-starting control method for photovoltaic inverter

A photovoltaic inverter and inverter technology, applied in photovoltaic power generation, output power conversion devices, electrical components, etc., can solve the problems of reducing power generation efficiency, unable to automatically restart, etc., and achieve the effect of reducing unnecessary shutdowns

Inactive Publication Date: 2014-11-19
安徽金峰新能源股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is that the existing photovoltaic inverter cannot be automatically restarted after being shut down by mistake, which reduces the power generation efficiency. Therefore, a self-starting control method for photovoltaic inverters is provided

Method used

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  • Auto-starting control method for photovoltaic inverter
  • Auto-starting control method for photovoltaic inverter

Examples

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Embodiment 1

[0012] Example 1: After the photovoltaic inverter control system is powered on and initialized, the voltage, current and temperature parameters of the photovoltaic inverter are sampled and analyzed. , the photovoltaic inverter stops working and is disconnected from the switch of the public grid. When the photovoltaic inverter control system detects that the voltage, current and temperature parameters of the photovoltaic inverter are abnormal, it will trigger the photovoltaic inverter control system to monitor the timing of the downtime. When the downtime exceeds 3 minutes, the photovoltaic inverter control system will Determine whether the number of restarts exceeds 2 times (including 2 times), if not more than 2 times, send a signal to start the power tube of the inverter on the one hand, and send a signal to close the switch between the photovoltaic inverter and the public grid on the other hand, If it exceeds: 2 times, do not deal with it, keep the photovoltaic inverter in ...

Embodiment 2

[0013] Example 2: After the photovoltaic inverter control system is powered on and initialized, the voltage, current and temperature parameters of the photovoltaic inverter are sampled and analyzed. , the photovoltaic inverter stops working and is disconnected from the switch of the public grid. When the photovoltaic inverter control system detects that the voltage, current and temperature parameters of the photovoltaic inverter are abnormal, it will trigger the photovoltaic inverter control system to monitor the timing of the downtime. When it is found that the downtime exceeds 5 minutes, the photovoltaic inverter control system will Determine whether the number of restarts exceeds 4 times (including 4 times), if not more than 4 times, send a signal to start the power tube of the inverter on the one hand, and send a signal to close the switch between the photovoltaic inverter and the public grid on the other hand, If it exceeds: 4 times, do not process, keep the photovoltaic ...

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Abstract

The invention discloses an auto-starting control method for a photovoltaic inverter. The method comprises the following steps: sampling voltage, current and temperature parameters of the photovoltaic inverter; continuously sampling if the voltage, current and temperature parameters of the photovoltaic inverter are normal, once the stopping of the inverter is found, and the stopping time is longer than T1, on one hand, sending a start signal to a power valve of the inverter to enable the inverter to be started automatically, and on the other hand, sending a connection signal to enable the photovoltaic inverter and a public supply network to be switched on; stopping sending the start signal and the connection signal if the restart time is greater than N. The method has the benefits that the a control system tries to detect parameters which cannot be detected while the inverter is turned off under a starting up state so as to realize the auto-starting of the inverter, and auto-starting of the inverter cannot be realized after the inverter is restarted by a certain time, so that unnecessary stopping of the inverter which is caused by interference on the inverter can be reduced.

Description

technical field [0001] The invention relates to the field of grid control, in particular to a self-starting control method of a photovoltaic inverter. Background technique [0002] In recent years, wind energy, solar energy and other renewable energy grid-connected power generation technology has become a research hotspot. Grid-connected inverters play an important role as the interface equipment between renewable energy power generation systems and power grids. Photovoltaic inverter is the key equipment of solar photovoltaic power generation system. It converts the direct current generated by the solar photovoltaic cell array into alternating current that meets the quality requirements of the power grid and provides it to local users and the power grid. [0003] During the operation of high-power photovoltaic inverters, due to some external interference factors, grid instability and the accuracy of its own sampling circuit, the sampled parameters will be wrong, whic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/36H02J3/38
CPCY02E10/56
Inventor 程刚徐遥査宏胜聂群
Owner 安徽金峰新能源股份有限公司
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