Current Harmonic Compensation and Power Factor.Docx
Current Harmonic Compensation and Power Factor
Improvement by Hybrid Shunt Active Power Filter
ABSTRACT
In this paper the current harmonic can be compensated by using the Shunt Active Power Filter, Passive Power Filter and the combination of both. The system has the function of voltage stability, and harmonic suppression. The reference current can be calculated by dq transformation.
An improved generalized integrator control was proposed to improve the performance of APF. The simulation results of the non- linear systems have been carried out with
MATLAB 7.6.
1. INTRODUCTION
The growing use of electronic equipment produces a large amount of harmonics in the power distribution systems because of non-sinusoidal currents consumed by non-linear loads. Some of the examples for non-linear loads are diode-rectifiers, thyristor converters, adjustable speed drives, furnaces, computer power supplies, uninterruptible power supplies, etc. Even though these devices are economical, flexible and energy efficient, they may degrade power quality by creating harmonic currents and consuming excessive reactive power. The above phenomena can cause many problems such as resonance, excessive neural currents, low power factor etc.
Harmonic distortion in power distribution systems can be suppressed using two approaches namely, passive and active powering. The passive filtering is the simplest conventional solution to mitigate the harmonic distortion. Although simple, the use passive elements do not always respond correctly to the dynamics of the power distribution systems. Over the years, these passive filters have developed to high level of sophistication. Some even tuned to bypass specific harmonic frequencies.
Conventional passive filters consist of inductance, capacitance, and resistance elements configured and tuned to control the harmonics. The singletuned
“notch” filter is the most common and economical type of passive filter. The notch filter
Improvement by Hybrid Shunt Active Power Filter
ABSTRACT
In this paper the current harmonic can be compensated by using the Shunt Active Power Filter, Passive Power Filter and the combination of both. The system has the function of voltage stability, and harmonic suppression. The reference current can be calculated by dq transformation.
An improved generalized integrator control was proposed to improve the performance of APF. The simulation results of the non- linear systems have been carried out with
MATLAB 7.6.
1. INTRODUCTION
The growing use of electronic equipment produces a large amount of harmonics in the power distribution systems because of non-sinusoidal currents consumed by non-linear loads. Some of the examples for non-linear loads are diode-rectifiers, thyristor converters, adjustable speed drives, furnaces, computer power supplies, uninterruptible power supplies, etc. Even though these devices are economical, flexible and energy efficient, they may degrade power quality by creating harmonic currents and consuming excessive reactive power. The above phenomena can cause many problems such as resonance, excessive neural currents, low power factor etc.
Harmonic distortion in power distribution systems can be suppressed using two approaches namely, passive and active powering. The passive filtering is the simplest conventional solution to mitigate the harmonic distortion. Although simple, the use passive elements do not always respond correctly to the dynamics of the power distribution systems. Over the years, these passive filters have developed to high level of sophistication. Some even tuned to bypass specific harmonic frequencies.
Conventional passive filters consist of inductance, capacitance, and resistance elements configured and tuned to control the harmonics. The singletuned
“notch” filter is the most common and economical type of passive filter. The notch filter
References: pp. 1025-1034, Nov/Dec. 1989. Trans. Power Del., vol. 21, no. 3, pp. 1630–1635 Jul. Appl., vol. 38, no. 2, pp. 523–532, Mar. /Apr. 2002. IEEE Int. Conf. Intell. Syst. 21st Century, 1995, pp. 1034, Nov/Dec. 1989. Electron., vol. 55, no. 1, pp. 97–106, Jan. 2008. Proc. IEEE PESC’86, 1986, pp.321–330. Applicat., vol. IA-22, pp. 678–690, July/Aug. 1986. Electron., vol. 54, no. 5, pp. 2791–2796, Oct. 2007. Electron., vol. 54, no. 1, pp. 330–337, Feb. 2007.