Nov 16, 2020
The role of photovoltaic inverters, how useful are photovoltaic inverters?part.(I)
Inverter, also known as power regulator and power regulator, is an essential part of photovoltaic system. Generally, the process of converting DC power into AC power is physically called inverter, and the device that realizes the inverter process is called inverter equipment or inverter. The name of the inverter comes from this. The main function of the photovoltaic inverter is to convert the direct current generated by the solar panel into the alternating current used by home appliances.
The inverter is the heart of the photovoltaic system. All the electricity generated by the solar panel must be processed by the inverter to be externally output. The inverter plays an important role in the operation of the entire system. The following editor will introduce to you What are the important functions of the inverter?
a. Maximum power tracking function to ensure maximum output power
The current and voltage of solar panels vary with the intensity of solar radiation and the temperature of the solar panels themselves, so the output power will also change. In order to maximize the output power, it is necessary to obtain the maximum output power of the panels as much as possible. The MPPT tracking function of the inverter is aimed at this
b. Anti-single operation function to ensure the safety of the power grid
When installing photovoltaic systems, many people have the mentality of “even if the grid is out of power, their homes can still use electricity”. They don’t know that when the grid is out of power, their home’s photovoltaic systems will stop operating.
The reason for this phenomenon is that anti-islanding devices are generally configured in inverters. When the grid voltage is 0, the inverter will stop working. Hearing this, does it feel like being pitted? Don’t worry, let me explain to you that the anti-islanding device is a necessary device for all grid-connected photovoltaic inverters. The reason for this is mainly for the power grid. For safety considerations, imagine that the power grid is out of power, and the grid workers have already gone into battle to overhaul the circuit, and your home’s photovoltaic system is still continuously uploading power... Is it easy to cause a safety accident?
If you really want to be able to use electricity in your own home when the grid is out of power, you can consider installing a photovoltaic off-grid system, so that the electricity generated by the solar panels will be stored and used when the user needs it. .
c. According to the output power of the solar panel, automatic operation and shutdown
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 by the inverter is reached, the inverter automatically starts to operate. After entering operation, the inverter will monitor the output of the solar cell components at all times. As long as the output power of the solar cell components is greater than the output power required by the inverter, the inverter will continue to run; it will stop until sunset, even if it is rainy The inverter can also operate. When the output of the solar cell module becomes smaller and the output of the inverter approaches 0, the inverter enters a standby state.