POWER FLOW MANAGEMENT OF PV SOLAR PLANT AS ACTIVE SOURCE DURING DAY AND PV STATCOM DURING NIGHT FOR INCREASING GRID POWER TRANSMISSION LIMITS

In this paper a simplified concept of utilizing a solar PV inverter as STATCOM, so called as PV-STATCOM, for improving power transfer capability of the interconnected transmission system during Night and Day. The inverter as part of the PV solar farm, which remains idle during night time, is utilized with voltage and damping controls to enhance stable power transmission limits. During daytime, the inverter capacity left after real power production is used to accomplish the aforementioned objective. Transient stability studies are conducted on a realistic single machine infinite bus power system having a midpoint located PV-STATCOM using MATLAB simulation software. The PV-STATCOM improves the stable transmission limits substantially in the night and in the day even while generating large amounts of real power. Power transfer increases are also demonstrated by comparing PI control and Wavelet Transformation control in the same power system for a solar farm as PV-STATCOM. This novel utilization of a PV solar farm asset can thus improve power transmission limits without making use of auxiliary filters.