Power quality analysis of solar power plant 1 mw and impacts an economic value in distribution power networks

Abstract

This thesis presents the Power Quality (PQ) analysis of solar power plant 1MW and economic impacts in the distribution power networks. The case study focuses on the penalty fee (fine) from consume the reactive power less than the limit of the Provincial Electricity Authority (PEA) of Thailand. The fine have been charged up to 900,000 baht per year. Therefore, the thesis studies and purposes the possible solution by analysing the operating function of the inverter (supports reactive mode), installing the adjustable capacitor bank 1500kVar in the Medium Voltage (MV) level and lastly installing the adjustable capacitor bank 1500kVar in the Low Voltage (LV) level. The results shown that the possible solution that reduces the fine is installed the adjustable capacitor bank 1500kVar in the MV. The investment of this installation is cost 1,800,000 baht with the nominal operation over 10 years. The analysis of financial investment, which bases on the Net Present Value (NPV), the Benefit-Cost ratio (B/C), the Pay Back period (PB) is presented the NPV at 4,902,971 baht, B/C 3.72 and PB 2 year (with the Internal Rate of Return; IRR 49.7 percent).