Harmonics, which are undesired consequences of nonlinear loads, impact power system stability and efficiency.
Implementing strong mitigation methods is essential for ensuring a resilient & high-performing electrical system.
Here’s a summary of the most effective approaches to reduce harmonics:
1). Passive Harmonic Filters
2). Active Harmonic Filters
3). Harmonic-Resistant Equipment
4). Isolation Transformers
5). Active Front-End Drives
6). Distributed Generation
7). Power Factor Correction
8). Harmonic Surveys and Monitoring
1). Passive Harmonic Filters
Function: Passive harmonic filters, including tuned and LC filters, reduce the effects of targeted harmonics by providing a passive, frequency-specific route.
Advantages: Cost-effective and straightforward implementation of specified harmonic frequencies.
2). Active Harmonic Filters
Function: Active harmonic filters use equal but opposite currents to cancel out undesired harmonics and provide real-time mitigation.
Advantages: Adaptable to changing harmonic situations and effective across a wide frequency range.
3). Harmonic-Resistant Equipment
Function: Using harmonic-resistant equipment, such as transformers and motors, can lower the power system’s sensitivity to harmonic disturbances.
Advantages: Provides intrinsic safety for essential equipment and improves system reliability.
4). Isolation Transformers
Function: Isolation transformers create a physical barrier in between the source & load, reducing harmonic distortions.
Advantages: Efficient for protecting sensitive equipment & isolating harmonic disturbances.
5). Active Front-End Drives
Function: Active front-end drives regulate input current waveforms to reduce harmonic distortion caused by variable frequency drives (VFDs).
Advantages: Reduces harmonics created by VFDs and improves power quality.
6). Distributed Generation
Function: Distributed generating using power electronics can lower the level of harmonics in the power system.
Advantages: Uses renewable energy sources, resulting in a cleaner and more dependable power supply.
7). Power Factor Correction
Function: Capacitors minimize harmonic distortion by decreasing reactive power.
Advantages: Improve power factor and indirectly reduces harmonics.
8). Harmonic Surveys and Monitoring
Function: Conducting harmonic surveys and ongoing monitoring identifies certain harmonic frequencies and their sources.
Advantages: Informs specific mitigation strategies and promotes proactive maintenance.
Additionally, a combination of all of these mitigation methods adapted to the individual features of the power system provides the most effective solution.