The Related Functions Of PV Inverter Are Introduced

1.Maximum power point tracking (MPPT) function

Maximum power point tracking (MPPT) is a core technology of photovoltaic inverters. Since the output power of a photovoltaic module changes with the intensity of solar radiation and the temperature of the module itself, there is an optimal operating point, the maximum power point (MPP). The function of MPPT is to make the photovoltaic module always work near the maximum power point, thus maximizing the power generation efficiency.

In order to achieve MPPT, the photovoltaic inverter will constantly detect the current and voltage changes of the photovoltaic module, and adjust the working state of the inverter according to these changes. Usually, MPPT is achieved through the DC/DC conversion circuit, by adjusting the PWM drive signal duty ratio of the DC/DC converter, so that the output of the photovoltaic module is always maintained near the maximum power point.

2.Power grid monitoring function

The power grid monitoring function enables the photovoltaic inverter to monitor the state of the power grid in real time, including voltage, frequency, phase and other parameters, to ensure the compatibility and stability of the photovoltaic power station and the power grid. Through the grid monitoring, the inverter can adjust its own output in real time to adapt to changes in the grid and ensure that the power quality meets the requirements of the grid. In addition, the power grid monitoring function can also help managers understand the operating status of the power grid, discover and deal with potential problems in a timely manner, and ensure the stable operation of photovoltaic power plants.

3.Fault protection function

Photovoltaic inverter has a complete fault protection function to deal with various abnormal situations that may occur in the actual use process, to protect the inverter itself and other components of the system from damage. These fail-safe features include:

1. Input undervoltage and overvoltage protection: When the input voltage is lower than or higher than a certain range of the rated voltage, the inverter starts the protection mechanism to prevent device damage.
2. Overcurrent protection: When the working current exceeds a certain proportion of the rated current, the inverter automatically cuts off the circuit to prevent excessive current from causing damage to the device.
3. Output short circuit protection: The inverter has a fast response short circuit protection function, which can cut off the circuit in a very short time after the short circuit occurs, and protect the equipment from the impact of short circuit current.
4. Input reverse protection: When the input is correct and the negative electrode is reversed, the inverter will start the protection mechanism to prevent the equipment from being damaged by the reverse voltage.
5. Lightning protection: The inverter has a built-in lightning protection device, which can protect the equipment from lightning damage in lightning weather.
6. Over temperature protection: The inverter also has over temperature protection function, when the internal temperature of the equipment is too high, it will automatically reduce the power or stop to prevent the equipment from being damaged due to overheating.

These fault protection functions together ensure the stable operation and safety of the solar inverter. In practical application, the fault protection function of photovoltaic inverter is of great significance to improve the reliability and stability of photovoltaic power station.