Field demonstration of a distribution static compensator used to mitigate voltage flicker

The DSTATCOM is a fast response, inverter-based power controller that provides flexible voltage control at the point of connection for improving the power quality in distribution systems. It can also provide instantaneous power factor correction to improve line utilization and minimize energy losses. The DSTATCOM is an alternating, synchronous voltage source connected in shunt (parallel) to the distribution three-phase feeder circuit via a coupling transformer. It can exchange reactive power with the distribution system by varying the amplitude and phase angle of an internal voltage source with respect to the line terminal voltage, resulting in controlled current flow through the coupling transformer. The DSTATCOM is a solid-state, DC to AC voltage-source inverter, utilizing advanced power semiconductor switching devices. It can effectively replace conventional voltage and VAr control elements, load tap changing transformers, voltage regulators and switched capacitors used in distribution systems. This paper presents the results of field tests conducted on the prototype model which was connected at a lumber mill for the purpose of mitigating running voltage flicker.