Implementation of Harmonic Filter for Power Quality Improvement
Model Overview
System Configuration: The model consists of three-phase voltage sources with a voltage of 500 kV and an operating frequency of 60 Hz.
Parameters: The source inductance is 98.3 mH, with line resistance of 26.7 ohms and inductance of 48.86 mH.
Measurement Points
Bus Configuration: We measure voltage and current at two buses (Bus 1 and Bus 2), capturing the three-phase voltage (VABC) and current (IABC) at each bus.
Nonlinear Load Simulation: A 1,000 MW load is created using a rectifier setup, simulating typical power quality problems.
Harmonic Filter Implementation
Types of Filters
Single-Tuned Harmonic Filter: Targets specific harmonic frequencies, notably the 11th harmonic.
Double-Tuned Harmonic Filter: Addresses multiple harmonics, including the 11th and 13th, for improved performance.
High-Pass Filters (IP and C-Type): These filters help reduce higher frequency harmonics.
Filter Configuration and Simulation
Switch Mechanism: Filters are enabled or disabled using manual switches, allowing for dynamic assessment of their effectiveness.
THD Measurement: Total Harmonic Distortion (THD) is measured before and after filter implementation to assess improvement.
Results
Initial THD Measurements
Without filters, the THD for voltage was around 16.86%, and for current, it ranged from 1.36% to 7.39%, indicating significant harmonic distortion due to the nonlinear load.
After Applying Filters
Single-Tuned Filter: Reduced THD for voltage phases A and B to approximately 1.47%, but had limited impact on phase C.
Double-Tuned Filter: Achieved further reductions in THD, effectively removing 11th and 13th harmonics, resulting in THD values of around 1.7% across all phases.
High-Pass Filters: Both IP and C-type high-pass filters showed similar results, improving power quality but not as effectively as the double-tuned filter.
Conclusion
The double-tuned harmonic filter demonstrated the best performance in reducing THD and improving overall power quality in the system. This study illustrates the effectiveness of harmonic filtering in mitigating power quality issues associated with nonlinear loads in power systems.
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