What is a solar inverter? What are the functions of solar inverters?
Time:2024-02-29
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A solar inverter is a device that can convert direct current in a solar battery into alternating current. Inverters, also known as power regulators or power regulators, are an essential part of photovoltaic power generation systems. The working circuit of a solar inverter must be a full bridge circuit, which changes the load and electrical properties of the current through a series of filtering and modulation in the full bridge circuit, achieving the user‘s expected goals. The common solar power generation system mainly consists of four parts, namely solar panels, charging controllers, solar inverters, and batteries. Solar panels are devices that provide direct current and can convert solar energy into electrical energy; The charging controller is mainly responsible for controlling the conversion of energy; Solar inverters convert the direct current of the solar panels into alternating current for storage by batteries, which mainly store alternating current for people‘s use. Solar inverters play a bridging role in the entire solar power generation system.
The characteristics of solar inverters
The characteristics of solar inverters
The main characteristics of solar inverters are centralized inverter and series inverter. The scale of solar power generation systems is generally very large, and if one solar panel corresponds to one inverter, it will cause resource waste, which is not practical. Therefore, in actual production, solar inverters are centralized inverters that convert the direct current emitted by all battery panels into alternating current. Therefore, the scale of solar inverters generally needs to adapt to the size of the solar panels. Therefore, a single solar inverter is obviously unable to meet this requirement, which leads to another characteristic of solar inverters, often being used in series.
The functional role of solar inverters
The functional role of solar inverters
Inverters not only have the function of DC/AC conversion, but also have the function of maximizing the performance of solar cells and maintaining system faults. It can be summarized as active operation and shutdown function, maximum power tracking control function, anti independent operation function (for grid connected systems), active voltage adjustment function (for grid connected systems), DC detection function (for grid connected systems), and DC grounding detection function (for grid connected systems). Here is a brief introduction to the functions of active operation and shutdown, as well as the maximum power tracking control function.
Active operation and shutdown function: After sunrise in the morning, the solar radiation intensity gradually increases, and the output of the solar cell also increases. When the output power required for the inverter task is reached, the inverter starts to operate actively. After entering operation, the inverter will constantly monitor 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 the inverter task, the inverter will continue to operate; Until sunset, the inverter can still 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 mode.
Active operation and shutdown function: After sunrise in the morning, the solar radiation intensity gradually increases, and the output of the solar cell also increases. When the output power required for the inverter task is reached, the inverter starts to operate actively. After entering operation, the inverter will constantly monitor 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 the inverter task, the inverter will continue to operate; Until sunset, the inverter can still 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 mode.
ZUI high-power tracking control function: The output of the solar cell module changes with the intensity of solar radiation and the temperature of the solar cell module itself (chip temperature). Due to the characteristic of voltage decreasing with increasing current in solar cell modules, there are excellent ZUI task points that can obtain high power from ZUI. The intensity of solar radiation is constantly changing, and it is evident that the optimal task point for ZUI is also changing. Regarding these changes, the task point of the solar cell module has always been at the ZUI high-power point, and the system has been obtaining ZUI high-power output from the solar cell module. This control is called ZUI high-power tracking control. The main feature of the inverter used in solar power generation systems is that it includes the function of ZUI High Power Point Tracking (MPPT).
Patrick Qi
Patrick Qi
Gitenno