Toshiba Mitsubishi-Electric Industrial Systems Corp (TMEIC) developed new large-size power conditioning subsystems (PCSes) for mega-solar (large-scale photovoltaic (PV)) power plants.
They are the "Solar Ware 665E" (output power: 665kW) and "750E" (output power: 750kW) and Japan's first PCSes that support 1,000V PV power generation systems and can output a power of 650kW or higher. The prices of the 665E and 750E are ¥12.7 million (approx US$129,039) and 13.4 million, respectively.
Their prices per kilowatt are about ¥19,100 and 17,900, which are about 20% lower than that of TMEIC's previous model (price: ¥11 million, output: 500kW, price per kilowatt: about ¥22,000).
If used for a 1.5MW mega-solar power plant, two units of the 750E are required while three units are required in the case of the 500kW model. In addition to their lower prices per kilowatt, the new models enable to reduce the numbers of peripheral devices such as power transformers and installation cost, potentially further lowering the cost of the entire system.
Renewable energy-based power plants have high ratios of facility cost to total cost. Therefore, their profitability has been improved by increasing output per system to decrease initial investment cost per kilowatt.
Wind power generation systems are a typical example. Recent onshore and floating wind power generation systems have output powers of about 2MW and 7MW per system, respectively. PCSes for mega-solar plants are in the same trend, and the capacities of their facilities are expected to increase.