Power quality improvement under nonideal AC mains in distribution system

摘要

The DSTATCOM (Distribution Static Compensator) is one of effective and reliable solution for compensation of harmonics and load balancing which are common in normal distribution system. The main focus of this paper is on the control of a DSTATCOM under non-ideal ac mains where a modified synchronous detection algorithm is used for extraction of reference supply currents. The DSTATCOM is used for mitigation of current harmonics, load balancing with self supporting dc bus voltage of VSC (Voltage Source Converter) used as a DSTATCOM. Proposed control algorithm is implemented in a DSP (Digital Signal Processor) for switching of VSC of DSTATCOM under nonlinear loads. Its performance is found satisfactory under steady state and dynamics conditions.