An inverter is a device that converts direct current into alternating current. Solar cells generate direct current under sunlight, and what is stored in the battery is also direct current. However, direct current power supply systems have significant limitations, as AC loads such as fluorescent lamps, televisions, refrigerators, and fans in daily life cannot be powered by direct current power. To widely apply photovoltaic power generation in our daily lives, inverters that can convert direct current into alternating current are indispensable.

光伏逆變器作為光伏發(fā)電的重要組成部分，主要的作用是將光伏組件發(fā)出的直流電轉(zhuǎn)變成交流電。逆變器不僅具有直交流變換功能，還具有大限度地發(fā)揮太陽電池性能的功能和系統(tǒng)故障保護功能。下面為大家簡單介紹光伏逆變器的自動運行和停機功能及大功率跟蹤控制功能。

As an important component of photovoltaic power generation, the main function of photovoltaic inverters is to convert the direct current generated by photovoltaic modules into alternating current. The inverter not only has the function of direct AC conversion, but also has the function of maximizing the performance of solar cells and system fault protection. Below is a brief introduction to the automatic operation and shutdown functions of photovoltaic inverters, as well as the high-power tracking control function.

1、大功率跟蹤控制功能

1. High power tracking control function

太陽電池組件的輸出是隨太陽輻射強度和太陽電池組件自身溫度(芯片溫度)而變化的。另外由于太陽電池組件具有電壓隨電流增大而下降的特性，因此存在能獲取大功率的佳工作點。太陽輻射強度是變化著的，顯然佳工作點也是在變化的。相對于這些變化，始終讓太陽電池組件的工作點處于大功率點，系統(tǒng)始終從太陽電池組件獲取大功率輸出，這種控制就是大功率跟蹤控制。太陽能發(fā)電系統(tǒng)用的逆變器的大特點就是包括了大功率點跟蹤(MPPT)這一功能。

The output of solar cell modules varies with the intensity of solar radiation and the temperature of the solar cell module itself (chip temperature). In addition, due to the characteristic that the voltage of solar cell components decreases with the increase of current, there is an excellent working point for obtaining high power. The intensity of solar radiation is constantly changing, and obviously the optimal operating point is also changing. Compared to these changes, the operating point of the solar cell module is always at the high-power point, and the system always obtains high-power output from the solar cell module. This control is called high-power tracking control. The main feature of inverters used in solar power generation systems is that they include the function of High Power Point Tracking (MPPT).

2、自動運行和停機功能

2. Automatic operation and shutdown functions

早晨日出后，太陽輻射強度逐漸增強，太陽電池的輸出也隨之增大，當(dāng)達到逆變器工作所需的輸出功率后，逆變器即自動開始運行。進入運行后，逆變器便時時刻刻監(jiān)視太陽電池組件的輸出，只要太陽電池組件的輸出功率大于逆變器工作所需的輸出功率，逆變器就持續(xù)運行;直到日落停機，即使陰雨天逆變器也能運行。當(dāng)太陽電池組件輸出變小，逆變器輸出接近0時，逆變器便形成待機狀態(tài)。

After sunrise in the morning, the intensity of solar radiation gradually increases, and the output of the solar cell also increases. When the output power required for inverter operation is reached, the inverter automatically starts running. After entering operation, the inverter constantly monitors the output of the solar cell module. As long as the output power of the solar cell module is greater than the output power required for inverter operation, the inverter will continue to operate; Until sunset, the inverter can operate even on cloudy and rainy days. When the output of the solar cell module decreases and the inverter output approaches 0, the inverter forms a standby state.

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