光伏發(fā)電是利用半導(dǎo)體界面的光生伏特效應(yīng)而將光能直接轉(zhuǎn)變?yōu)殡娔艿囊环N技術(shù)。這種技術(shù)的關(guān)鍵元件是太陽能電池。太陽能電池經(jīng)過串聯(lián)后進(jìn)行封裝保護(hù)可形成大面積的太陽電池組件，再配合上逆變器,功率控制器等部件就形成了 光伏 發(fā)電裝置。

光伏發(fā)電的優(yōu)點(diǎn)是較少受地域限制，因?yàn)殛柟馄照沾蟮?，光伏系統(tǒng)還具有安全可靠、無噪聲、低污染、無需消耗燃料和架設(shè)輸電線路即可就地發(fā)電供電及建設(shè)同期短的優(yōu)點(diǎn)。

光伏逆變器 作為一項(xiàng)電子產(chǎn)品，由眾多元器件組成。逆變器又稱電源調(diào)整器，根據(jù)逆變器在光伏發(fā)電系統(tǒng)中的用途可分為獨(dú)立型電源用和并網(wǎng)用二種。根據(jù)波形調(diào)制方式又可分為方波逆變器、階梯波逆變器、正弦波逆變器和組合式三相逆變器。

對于用于并網(wǎng)系統(tǒng)的逆變器，根據(jù)有無變壓器又可分為變壓器型逆變器和無變變壓器型逆變器。當(dāng)并網(wǎng)發(fā)電的時(shí)候還要和電網(wǎng)相連，這里就要注意了，因?yàn)樗奶厥庑?，在安裝、維修的時(shí)候萬萬不能粗心大意，否則的話可能出現(xiàn)這樣那樣的隱患。那么我們該如何去注意呢？這里我們就從維修方面來說起。

光伏發(fā)電系統(tǒng)安裝并網(wǎng)后，難免不出現(xiàn)問題，出現(xiàn)問題后就要進(jìn)行檢查維修，光伏逆變器維修注意事項(xiàng)有以下幾點(diǎn)：

1、在進(jìn)行任何維修工作前，應(yīng)首先斷開逆變器與電網(wǎng)的電氣連接，然后斷開直流側(cè)電氣連接。

2、等待至少5分鐘直到內(nèi)部元件放電完畢方可進(jìn)行維修工作。

3、任何影響逆變器安全性能的故障必須立即排除方可再次開啟逆變器。

4、避免不必要的電路板接觸

5、遵守靜電防護(hù)規(guī)范，佩戴防靜電手環(huán)。

6、注意并遵守產(chǎn)品上的警告標(biāo)識。

7、操作前初步目視檢查設(shè)備有無損壞或其它危險(xiǎn)狀態(tài)。

8、注意逆變器熱表面。例如功率半導(dǎo)體的散熱器等，在逆變器斷電后一段時(shí)間內(nèi)，仍保持較高溫度。

最后，機(jī)器維修完畢后，要確保任何影響逆變器安全性能的故障已將解決，才能再次開啟逆變器。明白了光伏并網(wǎng)逆變器的維修規(guī)范，在日常維護(hù)維修過程中加以注意，這樣才能避免隱患的發(fā)生。 

Photovoltaic power generation is a technology that directly converts light energy into electrical energy by using the photovoltaic effect at the semiconductor interface. The key component of this technology is the solar cell. After the solar cells are connected in series, they can be packaged and protected to form a large area of solar cell modules, and then combined with inverter, power controller and other components to form a photovoltaic power generation device.



The advantage of photovoltaic power generation is that it is less restricted by region. Because the sun shines on the earth, the photovoltaic system also has the advantages of safety, reliability, no noise, low pollution, local power generation and power supply without fuel consumption and power transmission lines, and short construction period.



As an electronic product, photovoltaic inverter is composed of multiple devices. Inverter, also known as power regulator, can be divided into independent power supply and grid connection according to the use of inverter in photovoltaic power generation system. According to the waveform modulation mode, it can be divided into square wave inverter, step wave inverter, sine wave inverter and combined three-phase inverter.



The inverter used in grid connected system can be divided into transformer type inverter and non transformer type inverter according to whether there is transformer or not. When the grid connected power generation is to be connected to the power grid, we should pay attention to it. Because of its particularity, we must not be careless in installation and maintenance, otherwise there may be hidden dangers. So how do we pay attention? Here we will start from the aspect of maintenance.



After the photovoltaic power generation system is installed and connected to the grid, it is inevitable that there will be no problems. After problems occur, it is necessary to carry out inspection and maintenance. The precautions for photovoltaic inverter maintenance are as follows:



1. Before any maintenance work, the electrical connection between the inverter and the power grid shall be disconnected first, and then the DC side electrical connection shall be disconnected.



2. Wait for at least 5 minutes until the internal components are discharged.



3. Any fault affecting the safety performance of the inverter must be eliminated immediately before starting the inverter again.



4. Avoid unnecessary board contact



5. Observe the static electricity protection specifications and wear anti-static bracelets.



6. Pay attention to and observe the warning signs on the product.



7. Conduct preliminary visual inspection for damage or other dangerous conditions before operation.



8. Pay attention to the inverter hot surface. For example, the heat sink of the power semiconductor still maintains a high temperature for a period of time after the inverter is powered off.



Finally, after the machine is repaired, ensure that any fault affecting the safety performance of the inverter has been solved, and then start the inverter again. Understand the maintenance specifications of photovoltaic grid connected inverter and pay attention to them in the process of daily maintenance, so as to avoid hidden dangers.

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