What is TMEIC's '3rd-Generation PV Inverter'? (1) (page 2)

With advantages of both central-, string-type PV inverters

2019/08/17 17:45
Kenji Kaneko, Nikkei BP Intelligence Group, CleanTech Labo
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Maximum output of 4.5MW realized by connecting 6 units

Under such circumstances, TMEIC announced that it aims to develop a "third-generation PV inverter" with the advantages of the two systems and actively promote the sale of the products as the future flagship model. The company calls the new model with the new concept the "modular PV inverter."

The domestic model of the "Solar Ware U" unveiled on July 10 comes in two types: one with a rated unit output of 675kW and one with a rated unit output of 750kW. The units are installed independently or by connecting up to six units. The optimum output is realized by changing the number of units to be connected according to the conditions of each site (Fig. 2).

Fig. 2: Four modular PV inverters connected in this example (source: TMEIC)

Specifically, when six 750kW modules are connected, the maximum output will total 4.5MW. Because the maximum output of conventional TMEIC PV inverters was 3.2MW per unit, the maximum output realized by connecting the "Solar Ware U" units will exceed this total by 1.3MW. This means that the "large capacity," which is the advantage of central-type PV inverters, was further advanced by the new models.

Meanwhile, which of the "advantages of the string type" was incorporated in the new products and how?