Application of inverter technology in solar panels inverter systems

Solar panels inverter systems are composed of solar cell, solar inverter, storage battery and controller.
The solar cell array increases the area of receiving light, which improves the efficiency of converting solar energy into direct current. The controller is designed to extend the life of the battery and the use of the inverter. The inverter plays the role of converting the DC power to AC, and the DC can supply power to AC load through the inverter.
The solar inverter is now divided into two categories, which are independent solar inverter and grid connected solar inverter.
Through reliability, rated output capacity, inverter efficiency, starting performance, harmonic distortion and output voltage stability to evaluate a independent inverter. While the grid connected inverter is mainly used in peak shaving PV power station and rooftop solar power systems, thus requiring the sine wave output current of the grid connected inverter and grid voltage should be in the same frequency. In addition, the off-grid solar power inverter is different from the independent inverter because the grid connected inverter must have island effect protection. It will bring tremendous danger to personnel and equipment if there is no island effect protection. For example, after the power supply of power grid is off, when staff maintenance the power system, the power supply of grid connected inverter may be still on, resulting in casualties. There are two kinds of prevention measures to be taken in this kind of accident, one is the active detection, the other is the passive detection. Active detection is to judge whether the power grid is on through testing the amplitude, frequency, phase and other parameters of the power grid voltage. While the passive detection is to to judge whether the power grid is lost through the detection of feedback signal. So as to make sure that staff and equipment in a safe state.


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