Document Type : Research article

Authors

• Arash Rohani ¹
• Javad Ebrahimi ¹
• Shirin Besati ²

¹ Power Systems Engineer at APD Engineering, Perth WA 6000, Australia

² Department of Electrical and Computer Engineering, University of North Carolina at Charlotte, USA

Abstract

A two-layer combined control method is developed for a four-leg Distribution Static Synchronous Compensator (DSTATCOM). The method aims at harmonics reduction, demand-generation equilibrium, power factor modification, voltage adjustment, and neutral current modification in a 3ph 4-wire distribution system. In the first layer, a recursive Least Error Square algorithm (RLES) based on a new fuzzy logic-based variable forgetting factor is used for Real-time estimation of voltage and current signals and their constituting components. The second layer’s duty is to extract the reference currents using the outputs of the first layer. Besides the high accuracy and convergence speed, the suggested algorithm is independent of coordinate transformations and complex computation when attempting to derive the reference currents of DSTATCOM. To enhance the dynamic performance of DSATATCOM, an adaptive hysteresis band current controller was utilized to generate switching signals. The effectiveness of the presented control strategy was verified via simulation studies implemented in MATLAB/Simulink environment.

Highlights

• Presenting a new control algorithm to improve power quality parameters in a three-phase four-wire distribution system compensated with DSTATCOM
• Using a recursive least error square algorithm based on the variable factor of fuzzy logic to estimate the current amplitude and phase angle of voltages and currents
• Improving the dynamic performance of DSATATCOM using an adaptive hysteresis band current controller to generate switching signals
• Presenting a new algorithm for extracting DSTATCOM reference currents with the aim of improving power quality

Keywords

• DSTATCOM
• Power Quality
• Recursive Least Error Square
• Fuzzy Logic Variable Forgetting Factor
• Adaptive Hysteresis Band Current Control

Main Subjects

• Power Quality