In PV power plant systems, the cost of the inverter is less than 8%, but it is the decisive factor of the power generation efficiency. In the PV power plant, when the components and other accessories are completely the same, different inverters are selected, and the total power generation of the system is There is a difference of 5% to 10%. After the system is installed as a function of power generation, the inverter becomes a decisive factor. Therefore, experienced manufacturers will select inverters with high total power generation and improve the efficiency of the entire system. The inverter has a relatively high technological content and integrates power, electronics, structure, thermal design, and control. It is obviously impossible for EPC manufacturers and power plant owners to become inverter experts. This article from the basic parameters of the inverter "output voltage", let everyone understand the inverter due to this parameter is different, the inverter's power output changes.
Now the domestic high-power power plant inverter, the output voltage of two kinds of 270V and 315V, common 270V output power level has 250KW, 400KW, 500KW, common 315V output power level has 315KW, 500KW, 630KW. From the perspective of the inverter, the 315V output 630KW inverter, hardware and 270V output 500KW inverter exactly the same. Therefore, the same power level inverter, 315V output voltage inverter than the 270V output voltage inverter inverter is about 20% lower, and the higher the voltage, the smaller the current, the efficiency will be higher.
However, taking into account the amount of power generated by the system, to fully utilize solar modules, Jingfuyuan inverter R&D engineers recommend selecting an inverter with 270V output. Before the inverter project was conducted, Jing Fuyuan research engineers had conducted on-site inspections of more than 50 photovoltaic power stations at home and abroad and found that the 630KW inverter output power was no more than 20% higher than the 500KW inverter. Only less than 15% increase. Through theoretical analysis and field analysis, it was found that the MPPT range of the 630KW inverter is 500V to 820V, while the MPPT range of the 500KW inverter is 450V to 820V. There is a voltage difference of 50V in the middle, which is usually solved by multiple strings and one or two components. But in fact, when it is overcast and rainy, there is still more time between 450V and 500V. So the total power generation time is 10% more than the former.
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