Grid connected power generation system

光伏并網(wǎng)系統(tǒng)由組件支架并網(wǎng)逆變器并網(wǎng)柜組成，太陽能電池板發(fā)出的直流電，經(jīng)逆變器轉(zhuǎn)換成交流電送入電網(wǎng)。目前主要有有大型地面電站中型工商業(yè)電站和小型家用電站三種形式。

The photovoltaic grid connected system consists of component brackets, grid connected inverters, and grid connected cabinets. The direct current generated by the solar panels is converted into alternating current by the inverters and sent to the power grid. At present, there are mainly three forms: large ground power stations, medium-sized industrial and commercial power stations, and small household power stations.

由于并網(wǎng)光伏發(fā)電系統(tǒng)不需要使用蓄電池，節(jié)省了成本。發(fā)布的并網(wǎng)新政策已經(jīng)明確表示，家庭光伏電站可以免費(fèi)入網(wǎng)，多余的電還可以賣給電力公司。從投資的長遠(yuǎn)角度，按家庭光伏電站25年的使用壽命計(jì)算，6-10年左右可以回收成本，剩下的十幾年就是賺到的。

Due to the fact that grid connected photovoltaic power generation systems do not require the use of batteries, costs are saved. The new grid connection policy released by the country has clearly stated that home photovoltaic power stations can be connected to the grid for free, and excess electricity can be sold to power companies. From the long-term perspective of investment, based on the 25 year service life of a household photovoltaic power plant, costs can be recovered in around 6-10 years, and the remaining ten years are earned.

但是，并網(wǎng)也有其缺點(diǎn)，就是當(dāng)公共電網(wǎng)斷電時(shí)，光伏發(fā)電也不能運(yùn)行。但是如果把其中的并網(wǎng)逆變器換成儲能逆變器，電站就可以正常運(yùn)轉(zhuǎn)。

However, grid connection also has its drawbacks, that is, when the public grid loses power, photovoltaic power generation cannot operate. But if the grid connected inverter is replaced with an energy storage inverter, the power plant can operate normally.

離網(wǎng)發(fā)電系統(tǒng)

Off grid power generation system

離網(wǎng)型光伏發(fā)電系統(tǒng)，不依賴電網(wǎng)而獨(dú)立運(yùn)行，廣泛應(yīng)用于偏僻山區(qū)無電區(qū)海島通訊基站和路燈等應(yīng)用場所。系統(tǒng)一般由太陽電池組件組成的光伏方陣太陽能控制器，逆變器蓄電池組負(fù)載等構(gòu)成。光伏方陣在有光照的情況下將太陽能轉(zhuǎn)換為電能，通過太陽能控制逆變一體機(jī)給負(fù)載供電，同時(shí)給蓄電池組充電；在無光照時(shí)，由蓄電池通過逆變器給交流負(fù)載供電。

Off grid photovoltaic power generation systems operate independently of the power grid and are widely used in remote mountainous areas, such as island communication base stations and street lights. The system generally consists of a photovoltaic array solar controller composed of solar cell components, an inverter battery pack load, etc. The photovoltaic array converts solar energy into electrical energy under illumination, and supplies power to the load through the solar controlled inverter integrated machine, while charging the battery pack; When there is no light, the battery supplies power to the AC load through the inverter.

這種系統(tǒng)由于必須配備蓄電池，且占據(jù)了發(fā)電系統(tǒng)30－50%的成本。而且鉛酸蓄電池的使用壽命一般都在3－5年，過后又得更換，這更是增加了使用成本。而經(jīng)濟(jì)性來說，很難得到大范圍的推廣使用，因此不適合用電方便的地方使用。

This system requires batteries and accounts for 30-50% of the cost of the power generation system. Moreover, the service life of lead-acid batteries is generally 3-5 years, and they have to be replaced later, which further increases the cost of use. Economically speaking, it is difficult to promote and use it on a large scale, so it is not suitable for use in places where electricity is convenient.

對于無電網(wǎng)地區(qū)或經(jīng)常停電地區(qū)家庭來說，離網(wǎng)系統(tǒng)具有很強(qiáng)的實(shí)用性。特別是單純?yōu)榱私鉀Q停電時(shí)的照明問題，可以采用直流節(jié)能燈，非常實(shí)用。因此，離網(wǎng)發(fā)電系統(tǒng)是專門針對無電網(wǎng)地區(qū)或經(jīng)常停電地區(qū)場所使用的。

For households in areas without power grids or areas with frequent power outages, off grid systems have strong practicality. Especially to solve the lighting problem during power outages, DC energy-saving lamps can be used, which is very practical. Therefore, off grid power generation systems are specifically designed for use in areas without power grids or areas with frequent power outages.