The study of reactive power ancillary service of VSPPs to support the distributed PV inverters installation from customers

พงศธร เรื่องจันทร์, นพคุณ มีฮุข และ ภูมิพัฒน์ มหาสุวีระชัย

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กองวิเคราะห์และวางแผนระบบไฟฟ้ ฝ่ยวางแผนระบบไฟฟ้า การไฟฟ้ส่วนภูมิภาค

Abstract

The growing number of distributed PV inverters brings about certain problems in distribution systems and one of them is overvoltage. This problem could be alleviated by managing reactive power appropriately, particularly from very small power plants (VSPPs). This article demonstrates the method how to calculate thecost for doing sobecause these days PEAcharges the power plants if they receive reactive power. Feeder no.7 of Ubonratchathani-2 substationis used to study. The results reveal that in the system with 8.0-MW VSPPs, cost of voltage regulation of inverter based VSPPs is higher than synchronous based VSPPs because there is no loss ofopportunitycost from realpower reduction in synchronous based VSPPs