Photovoltaic grid-connected inverter test system

For a period of time, the strict "physical examination" of the solar power generation system was only completed by the expensive imported "doctor". On the 4th, from the School of Information Science and Engineering of Fudan University, it was learned that the domestic “photo-physician” of the solar power generation system—PV grid-connected inverter test system—will be officially unveiled at the Industrial Fair.

“Solar panels emit DC power and need to be converted to AC power before they can be integrated into the power grid. The equipment that undertakes this function—the inverter has become the core device of the entire system.” R&D team leader, School of Information Engineering, Fudan University Prof. Sun Yaojie said, "The key to the "physical examination of solar power systems" is the detection of inverter performance."

The photovoltaic grid-connected inverter test system developed by Fudan University uses the PV array analog power supply and the grid characteristics analog power supply to simulate the current conditions of the two-terminal interface of the inverter in practical applications, and tracks the dynamic process to the inverter. Performance is evaluated.

"The photovoltaic cell array analog power supply can not only simulate the output current of a simple photovoltaic panel, but also simulate shadow shading or current fluctuation caused by temperature and illumination variations, thereby simulating the characteristics of a real photovoltaic cell array in all directions." Sun Yaojie said, " It is this comprehensive environmental simulation that can truly detect the performance of the inverter in practical applications."

It is understood that China has become the fastest growing photovoltaic power generation country in the world together with the United States, and the application of grid-connected solar power generation systems is becoming more and more widespread. However, due to the lack of corresponding simulation technology in China, the detection of photovoltaic grid-connected inverters can only rely on imported equipment.

Today, the "physical examination" level of the domestic photovoltaic grid-connected inverter test system can be said to be exactly the same as that of "Dr. Yang", and the price is only one-third of that of foreign countries. At the same time, the system designed by Fudan's expert team also has a unique "back-feed function" - it can feed more than 85% of the electrical energy back into the grid, and testing and energy saving are correct.

Of course, "this analog power system also needs further upgrades to match the comprehensive test evaluation system that can be used for on-site on-site testing to build a road for the future smart grid," said Sun Yaojie.