Abstract
Voltage dip is a power quality problem that occurs the most frequently in the Provincial Electricity Authority (PEA) power system and impacts the industry's sensitive load. This paper presents a photovoltaic (PV) farm converter control as a static synchronous compensator (STATCOM), supplying dynamic reactive power for voltage dip mitigation and the industry's failure load reduction near the PV farm. The PV farm's power system and the industry connect with the 22 kV distribution system of Bang Phra khru substation (BPH) in Phra Nakhon Si Ayutthaya Province. A case study simulated on the DIgSILENT PowerFactory software and converter control as STATCOM operated in two modes: full STATCOM mode and partial STATCOM mode is presented. The distribution system data has been collected from the Geographic Information System (GIS). The voltage dip event data, caused by a single line to ground fault on other feeder and affected sensitive load, received from disturbance analyzer. The results of both STATCOM modes demonstrated an increased voltage value in the standard range of PEA. The partial STATCOM mode showed the voltage value better than the full STATCOM mode. As a result, PEA should improve the grid code determined the PV farm installed near the industry's sensitive load had to support dynamic power.
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