International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395 -0056
Volume: 04 Issue: 04 | Apr -2017
p-ISSN: 2395-0072
www.irjet.net
Improvement of Power Quality by using control strategy of series active filter Vivek Singh Chauhan 1, Pawan Pandey 2 1PG
Student, Department of Electrical & Electronics Engineering, Malwa Institute of Technology, Indore Prof., Department of Electrical & Electronics Engineering, Malwa Institute of Technology, Indore
2Asst.
---------------------------------------------------------------------***---------------------------------------------------------------------
Abstract - Harmonic current received from the supply
voltage source by the non-linear load results in the distortion of supply voltage waveform.The distorted voltage and current may possibly cause conductors to overheat and may reduce the efficiency. So that reduction of harmonics is very essential in today’s life. For that purpose series Active filters are used to adjust the supply voltage fluctuations by injecting voltage in phase at the point of common coupling (PCC). This in phase voltage is free from harmonics and able to compensate the reactive power. In this paper control strategy is discussed and Simulation waveforms have been carried out on the MATLAB SIMULINK platform with series active filter and results are presented. Key Words: Series active filter, PCC, Power Quality, Reactive power, harmonics.
1. INTRODUCTION Power quality describes the strength of electric power which is provided to consumer devices. Power quality is the problem manifested in disruption of voltage, current, or frequency variation that causes failure or an improper operation of user’s equipment. Power quality is the reliability issue as for as the users point of view. [1] Harmonics produced by non linear loads can produce detrimental effect on the systems equipment.
The existence of harmonics in power lines results in various power losses in the electrical system. These losses generate interference in communication systems and breakdown of electronic equipments, which are sensitive as they include © 2017, IRJET
|
Impact Factor value: 5.181
|
many microelectronic systems, which work under low energy levels. Due to these problems, issue arises in power quality delivered to the end consumers. So, for the better operation of the system it should be free from harmonics. There are many types of filters such as active filter, high pass filter, low pass The existence of harmonics in power lines results in various power losses in the electrical system. These losses generate interference in communication systems and breakdown of electronic equipments, which are sensitive as they include many microelectronic systems, which work under low energy levels. Due to these problems, issue arises in power quality delivered to the end consumers. So, for the better operation of the system it should be free from harmonics. There are many types of filters such as active filter, high pass filter, low pass filter, passive filter etc.[2]In high pass filter there are some disadvantages due to resistance connection in parallel to the conductor, so at tuned frequency filtering effectiveness cannot be achieve and thus filtering losses increased. Passive filters can be used for current harmonics compensation but it has some limitations such as fixed compensation, large size, bulkiness and resonance problem etc. So in these paper series active filter is discussed. [3]
2. NECESSITY FOR HARMONIC COMPENSATION The performance of Active power filters in this recent electronic age has become an ever more essential element to the electric network. With the advancement of power electronic devices between consumer and industry, there by utilities are in pressured for giving high power quality. Some Power electronic devices like computers, fluorescent light printers, faxes, and mainly other office equipment may generate create harmonics. Such types of device are commonly defined as nonlinear loads. Such loads produce harmonics by representing current distortion rather than a smooth sinusoidal waveform. The major issues associated with the harmonics supplied to nonlinear loads are severe overheating and reduction in efficiency. With the Increase in temperature the operation of generators and transformers may damage the insulation material of its windings. If this heat continues occur than it may cause flash over through the conductors. This may results in permanently damage of device and results in blackout with the loss of generation. The available solution to this problem is to mount active filters for separate nonlinear load in the power system network. However they are uneconomical, but the installation of active power filters proves crucial solution for power quality ISO 9001:2008 Certified Journal
|
Page 428