Power quality improvement and mitigation of harmonic distortion using DSTATCOM with PI and Fuzzy Logic Controller

In the last decade there has been an upsurge in the development of improved power conditioning devices due to the latest upheaval in the applications of custom power devices (CPDs). CPDs offer several advantages over conventional capacitor and inductor banks which tends to be bulkier, lossy, poor reliability and overall poor control and lower efficiency. Therefore, this paper presents a new array of utilization of CPDs involving DSTATCOM which is by far the most versatile device among several others for power quality improvement at the distribution side. Reliability and quality are the two most important facets of any power delivery system. The prime focus will be to comprehend various occurrences of faults in an interconnected transmission network and devising possible ways to mitigate those faults using DSTATCOM. Power Electronic converters have played a pivotal role in the control of power quality mainly due to their fast action, reliability and lower cost in comparison to conventional electro-mechanical controllers. To obtain the desired objective IGBT based Voltage Source Converter (VSC) operating at high frequencies using Sinusoidal Pulse Width Modulation (SPWM) is used. For efficient reduction in harmonic contents passive LCL filter is used at the Point of Common Connection (PCC). Analysis involving both PI and Fuzzy Logic Controller is shown in the simulation results. Comparative analysis and pros and cons involving both the proposed control topologies are discussed. Here various kinds of faults commonly occurring in a power system are induced and their impact on power quality is monitored. All the simulation is done using MATLAB Simulink using SimPower System Blockset (PSB) Toolbox.