The IUP Journal of Electrical and Electronics Engineering
Active Power Filters to Reduce Harmonics and Improve Power Quality

Article Details
Pub. Date : April, 2019
Product Name : The IUP Journal of Electrical and Electronics Engineering
Product Type : Article
Product Code : IJEEE21904
Author Name : Prakash L Chavan and Sanjeev K Nayak
Availability : YES
Subject/Domain : Management
Download Format : PDF Format
No. of Pages : 16



The paper focuses on the implementation of Hybrid Active Power Filter (HAPF) to compensate harmonics and improve power quality. Development in smart grid technology created a higher demand for improved power quality. Harmonics are the main constraints for poor power quality. Adjustable-speed drives, switching power supplies, arc furnaces, electronic fluorescent lamp ballasts, lightning strike and L-G fault are the sources of poor power quality. Nonlinear loads are the major source of harmonics in modern power system. The problems associated with power quality are voltage sags, voltage swells, interruption, sustained interruptions, overvoltage, undervoltage, long-duration voltage variations, voltage imbalance and waveform distortion. To overcome these problems, it is motivated to design the HAPF. For power quality improvement, hybrid filter has better filtering properties as it eliminates both high and low order harmonics. The p-q method is used for harmonic suppression. The expected properties of shunt hybrid power filter have been confirmed by simulation test in MATLAB/Simulink.


Nowadays, due to advancement in smart grid technology, there is a higher demand for improved power quality. However, with the increased use of power electronic devices and motor loading, it is becoming more difficult to achieve the goal. Due to rapid increase in the technology, especially in electric power sector, the use of nonlinear loads on a typical distribution system has increased. These nonlinear loads are the major source of harmonics in modern power system, which is making the system polluted. Modern equipments require clean power for their proper operation. Any problem associated with power quality such as voltage sags, swells, interruptions and waveform distortion causes the sensitive equipment to malfunction. To improve the quality of power, several filters are developed. In the mid-1940s, Passive Power Filters (PPF) were developed to suppress current harmonics and compensate reactive power. In 1976, Active Power Filters (APF) were developed to compensate harmonics. Hybrid APFs (HAPFs) are more attractive in harmonic filtering than pure APFs from both viability and economical view. To achieve the best performance, the United Power Quality Converter (UPQC) was developed at an extremely high cost. During 1967-2005, HAPFs were mainly applied to traditional industry such as steel furnace and ASD.


Harmonics, Hybrid filter, Power quality