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.

光伏逆变器作为光伏发电的重要组成部分，主要的作用是将光伏组件发出的直流电转变成交流电。逆变器不仅具有直交流变换功能，还具有大限度地发挥太阳电池性能的功能和系统故障保护功能。下面为大家简单介绍光伏逆变器的自动运行和停机功能及大功率跟踪控制功能。

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、大功率跟踪控制功能

1. High power tracking control function

太阳电池组件的输出是随太阳辐射强度和太阳电池组件自身温度(芯片温度)而变化的。另外由于太阳电池组件具有电压随电流增大而下降的特性，因此存在能获取大功率的佳工作点。太阳辐射强度是变化着的，显然佳工作点也是在变化的。相对于这些变化，始终让太阳电池组件的工作点处于大功率点，系统始终从太阳电池组件获取大功率输出，这种控制就是大功率跟踪控制。太阳能发电系统用的逆变器的大特点就是包括了大功率点跟踪(MPPT)这一功能。

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、自动运行和停机功能

2. Automatic operation and shutdown functions

早晨日出后，太阳辐射强度逐渐增强，太阳电池的输出也随之增大，当达到逆变器工作所需的输出功率后，逆变器即自动开始运行。进入运行后，逆变器便时时刻刻监视太阳电池组件的输出，只要太阳电池组件的输出功率大于逆变器工作所需的输出功率，逆变器就持续运行;直到日落停机，即使阴雨天逆变器也能运行。当太阳电池组件输出变小，逆变器输出接近0时，逆变器便形成待机状态。

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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