Design and development of DSP-based active filters for improving power quality

• Main Author: Xu, Kai Bin.
• Other Authors: So Ping Lam
• Format: Final Year Project
• Language: English
• Published: 2009
• Subjects: DRNTU::Engineering::Electrical and electronic engineering::Power electronics
• Online Access: http://hdl.handle.net/10356/17272
• Institution: Nanyang Technological University

The recent proliferation of power electronics and nonlinear equipments in both residential and industrial sectors has lead to degradation in power quality. These equipments tend to inject harmonics into the system, contaminating the power supply. Ironically, it is the same equipments that need a high quality supply to function correctly. To reduce the effects of harmonics contamination, this project looks into the viability and implementation of active filters based on digital signal processing. The particular type of active filters we are looking into will be the Unified Power Quality Conditioner (UPQC). Hysteresis control theory will be used to manage the UPQC. Simulation will be conducted using Matlab Simulink to test the feasibility and simulated results of the concept. Once the results are deemed satisfactory, the actual test circuit will be built and the Matlab Simulink based controller will be run in real time through the dSPACE ControlDesk real time interface. In the test circuit, voltage and current extractor circuits will send voltage and current information to the controller which will use Fast Fourier Transform to differentiate the fundamental component from the harmonics. The controller with the UPQC will then attempt to reduce the amount of harmonics in the circuit.